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TROPICAL CYCLONE REPORTS
Tropical Storm Allison
Tropical Depression Two
Tropical Storm Barry
Tropical Storm Chantal
Tropical Storm Dean
Hurricane Erin
Hurricane Felix
Hurricane Gabrielle
Tropical Depression Nine
Hurricane Humberto
Hurricane Iris
Tropical Storm Jerry
Hurricane Karen
Tropical Storm Lorenzo
Hurricane Michelle
Hurricane Noel
Hurricane Olga
|
Tropical Cyclone Report
Tropical Storm Allison
5 - 17 June 2001
Stacy R. Stewart
National Hurricane Center 28 November 2001 Revised: 8 February 2002
Tropical Storm Allison developed over the northwestern Gulf of
Mexico and moved inland over the upper Texas coast, producing
extremely heavy rainfall and catastrophic floods in the Houston
area. Allison then acquired subtropical characteristics and
continued to produce heavy rainfall and flooding near its track
from Louisiana eastward to North Carolina, and then northward along
the U.S. east coast to Massachusetts.
a. Synoptic History
Satellite images and synoptic data indicate that Allison
originated from a tropical wave that moved off the west coast of
Africa on 21 May. The wave tracked westward at about 15 kt across
the tropical Atlantic with little associated convection before
moving inland over the northern part of South America on 26 May. It
emerged over the southwestern Caribbean Sea on 29 May. The wave
moved westward into the eastern North Pacific Ocean on 1 June, then
slowed down over the Gulf of Tehuantepec. On 2 June, the wave
produced a low-level cyclonic circulation centered about 200 n mi
south-southeast of Salina Cruz, Mexico.
On 3 June, low- to mid-level southwesterly flow in the southeast
quadrant of the Mexican thermal low moved the broad cyclonic
circulation inland over extreme southeastern Mexico and western
Guatemala. The low-level circulation weakened and became
ill-defined after moving inland, whereas the strong mid-level
circulation remained intact and tracked northeastward over the
southern Yucatan Peninsula early on the 4th. By 0000 UTC
5 June, the mid-level circulation had moved northwestward into the
Bay of Campeche of the Gulf of Mexico. Deep convection developed
along the western (cyclonic-shear) side of a 30 to 40 kt low-level
jet whose axis extended north-northwestward from Merida, Mexico to
the Texas-Louisiana border. The deep convection persisted during
the night of the 5th and eventually moved
north-northwestward around an upper-level cold low centered over
south Texas. The difluent eastern semicircle of the upper-level low
acted to enhance the development of deep convection.
By 1200 UTC on the 5th, satellite imagery and surface
observations suggest that the mid-level circulation developed
downward and became Tropical Storm Allison about 120 n mi south of
Galveston, TX (see Figure 1 - Figure 3 and
Table 1).
The cold-core nature of
the upper low detected in 0000 and 1200 UTC 5 June upper-air data
suggests, however, that this system possessed some subtropical
characteristics.
A strong pressure gradient developed between Allison's center
and the Atlantic subtropical ridge, which extended westward across
Florida and the southeast U.S. and into the northeast Gulf of
Mexico. Allison's central pressure dropped and sustained winds
increased across a large portion of the central Gulf of Mexico.
Winds as high as 40 kt, with gusts to 50 kt, occurred more than 200
n mi east of the center. At 1500 UTC, a ship
reported a sustained wind of 43 kt with gusts to 60 kt.
(see Table 2) about 90 n mi east of the estimated
center location.
Confirmation of a closed circulation came at 1800 UTC
when Buoy 42019 (located about 60 n mi south of Freeport, TX)
reported a light northwest wind and a pressure of 1006.6 mb just
west of the surface center. At 1852 UTC, aircraft personnel on the
first U.S. Air Force Reserve reconnaissance flight of the day
"closed off" the low-level circulation about 80 n mi
south-southwest of Galveston, TX. A combination of a 55 kt
flight-level (1500 ft) wind report and the earlier ship reports
indicated that the storm had strengthened. The cyclone tracked
slowly north-northwestward and weakened slightly (based on offshore
buoy reports) just before making landfall southwest of Galveston
near Freeport, TX. Its center then tracked slowly northward across
the western portions of the Houston metropolitan area during the
night of the 5th and the morning of the 6th.
After moving inland, surface observations indicated
that Allison quickly weakened to a tropical depression. It drifted
slowly northward before becoming stationary over eastern Texas near
Lufkin on 7 June. On 8 June, Tropical Depression Allison began to
move slowly southward. It eventually moved back over the Gulf of
Mexico around 0000 UTC on the 10th, at nearly the same
location where it had made landfall as a tropical storm. Although
the low-level center remained over warm water on the
10th, very dry air in the mid- and upper-levels of the
troposphere overlaid the surface center. The dry air, combined with
moderate upper-level westerly shear, inhibited the redevelopment of
thunderstorms near the low-level center.
Upper-air observations indicated that by 0000 UTC
Allison had acquired some baroclinic characteristics and became a
subtropical depression. Most of the persistent deep convection was
then developing a couple hundred miles east of the low-level
center. A new low-level circulation developed around 0000 UTC 11
June, near the strongest thunderstorms about 150 n mi east of the
original center, approximately 50 n mi south of Intracoastal City,
LA. By 0200 UTC 11 June, the new center moved inland over southeast
Louisiana near Morgan City.
During the early morning hours of the
11th, strong thunderstorms became organized near the
low-level circulation center and surface observations indicated
that Allison had become a subtropical storm by 0600 UTC. Convection
wrapped all the way around the center creating an "eye-like"
feature (Figure 4) near 1200 UTC. In spite of the eye-like feature
apparent in radar imagery, the cyclone's radius of maximum winds
(~100 n mi) was more typical of a subtropical low. Also, surrounding
upper-air observations continued to show that Allison was in a
weakly baroclinic environment.
The subtropical storm tracked east-northeastward
across southern Mississippi. It weakened back to subtropical
depression status by 0000 UTC 12 June, when the system was located
over southwestern Alabama. It continued to track east-northeastward
across southern Alabama, southern Georgia, and southern South
Carolina before becoming stationary just north of Wilmington, NC on
the 14th. The center of Allison then drifted slowly
northward over eastern North Carolina and extreme southeastern
Virginia on the 15th. It then moved more quickly
northeastward and reached the mid-Atlantic coast on the
17th and eventually cleared the United States mainland
along the Delmarva Peninsula later that day. At 1200 UTC 17 June,
Allison began to interact with an approaching cold front and
briefly strengthened back to a subtropical storm.
Allison merged with the cold front around 0000 UTC 18
June, then becoming an extratropical low pressure system. Shortly
after becoming extratropical, the system accelerated
east-northeastward before dissipating southeast of Nova Scotia
around 0600 UTC 19 June.
b. Meteorological Statistics
Observations in Figure 2 and Figure 3
include satellite-based
Dvorak technique intensity estimates from the NOAA Tropical
Prediction Center's (TPC) Tropical Analysis and Forecast Branch
(TAFB), the NOAA Satellite Analysis Branch (SAB), and the U. S. Air
Force Weather Agency (AFWA), as well as data from flights of the
53rd Weather Reconnaissance Squadron of the U. S. Air
Force Reserve Command.
Ship reports of tropical storm force winds associated
with Allison are in Table 2, and selected surface observations from
land stations, C-MAN stations, and data buoys are in
Table 3.
Allison's peak intensity of 50 kt at 1800 UTC 5 June was based on a
1700 UTC ship (WTEJ) observation of 48 kt and a 55
kt surface wind estimate made by reconnaissance flight crew
personnel at 1852 UTC.
During and after Allison's landfall over the upper
Texas coast and its southward return to the Gulf of Mexico,
extremely heavy rainfall occurred over much of eastern and
southeastern Texas, including the Houston metroplex, and much of
southwestern Louisiana. Several locations on the east side of
Houston received more than 30 inches of rainfall (Figure 5). Heavy
rainfall and widespread flooding also occurred with the subtropical
low pressure system as it tracked across the southeast and eastern
United States (Figure 6).
Evacuations of the west end of Galveston Island were
required due to coastal flooding since this area is not protected
by the seawall that was built after the Great Hurricane of 1900.
Storm surge of 2 to 3 feet, when combined with wave heights up to 8
feet, created considerable overwash. This resulted in significant
beach erosion and damage to some of the island's roads. Additional
storm surge of 1 to 2 feet occurred over southeast Louisiana on the
11th when Allison passed over that area as a subtropical
storm.
A total of 23 tornadoes were confirmed from
Mississippi to South Carolina from 11-16 June Specifically, 10
tornadoes were reported in South Carolina, 4 in Mississippi, 3 in
Florida, 2 in both Alabama and Georgia, and 1 each in Louisiana and
Virginia.
In addition, on 17 June, several sailboats
participating in a sailing race from Annapolis, MD to Newport, RI
reported sustained winds from the northwest as high as 48 kt and
gusts as high as 68 kt at the mouth of Delaware Bay and just off
Cape May, NJ. However, the accuracy of these unofficial
observations is in doubt since they were not consistent with
surrounding official observations. The maximum sustained wind
observed was only 31 kt, at Buoy 44009 located just east of the
mouth of Delaware Bay. The highest official gust observed during
the passage of Subtropical Storm Allison off the U. S. east coast
was 36 kt at Atlantic City, NJ. The local pressure gradient along
the Delaware and New Jersey coasts also did not support winds as
high as those indicated by the sailing vessels. Interestingly
enough, though, the brisk winds associated with the subtropical
storm resulted in the previous race course record being broken by 5
hours.
c. Casualty and Damage Statistics
Allison's heavy rains produced catastrophic flooding
over portions of the upper Texas coastal area, and significant
flooding along the remainder of its track. The American Insurance
Group reported an insured property loss estimate of $1.22 billion.
The TPC standard procedure is to double the insured loss. This
results in a final total loss estimate of $2.44 billion. However,
damage estimates reported by the Federal Emergency Management
Agency (FEMA) and other state emergency management agencies are
near $5 billion, with approximately $4.8 billion in the Houston
metropolitan area alone. These damage estimates in the Houston area
include: $2.04 billion to public facilities (especially the Texas
Medical Center), $1.76 billion to residential properties, $1.08
billion to businesses. More than 14,000 homes were destroyed or
received major damage, and nearly an additional 34,000 homes
incurred at least minor damage. Some of the damage estimates from
emergency management agencies may include costs and expenses not
directly associated with the flood-related damage.
Forty-one deaths are directly related to the
heavy rain, flooding, tornadoes, and high surf generated by
Tropical Storm Allison and its remnant subtropical
circulation. The death toll by state is as follows: Texas
23, Florida 8, Pennsylvania 7, Louisiana 1, Mississippi 1, and
Virginia 1. Twenty-seven of these deaths were due to drowning in
freshwater flooding. Early morning on the
11th in Zachary, LA, a tornado (intensity unknown)
knocked down trees onto a pickup truck, killing the male driver.
Later that morning, an F1 tornado cut a 4 mile long path across
George County, MS. It damaged several manufactured homes and
completely destroyed a mobile home (tiedowns were pulled out of the
ground and the home turned over and fell apart as it rolled),
severely injuring a female occupant. There were also 9
indirect deaths in North Carolina as a result of traffic accidents
occurring on wet roads. These damage and direct death toll
estimates make Allison the deadliest and most costly tropical or
subtropical storm on record in the United States.
d. Forecast and Warning Critique
No meaningful track and wind forecast
statistics are available due to the limited period for which the
National Hurricane Center (NHC) issued forecasts. Since the system
reached storm strength quickly, there was little warning lead time.
A tropical storm warning was issued at 1900 UTC 05 June from
Sargent, Texas eastward along the Gulf of Mexico coast to Morgan
City, Louisiana. This was less than 3 hours before tropical storm
force winds were reported along the upper Texas coast.A subsequent
analysis of satellite and surface
observation data indicate that Allison was likely a tropical storm
by 1200 UTC 5 June. Determination of a closed surface low
pressure system was delayed by at least 6 hours as a result of Buoy
42002 not reporting due to its previous collision with a ship.
In addition, Dvorak satellite
classifications were not representative of the true intensity of
the hybrid system.
After Tropical Depression Allison emerged over the
northern Gulf of Mexico, the TAFB issued a gale warning for the
northeastern Gulf of Mexico about three hours prior to Allison
reaching subtropical storm status. The sustained gale force winds
were primarily confined to a thunderstorm squall line in the
eastern portion of the low pressure system. The Marine Prediction
Center (MPC) in Washington, D.C. also issued gale warnings for
portions of the mid-Atlantic offshore waters on 14 and 15 June when
Allison was expected to move off the North Carolina and Virginia
coasts and possibly reach subtropical storm strength.
Consistent with operational protocol, responsibility
for Allison was transferred from the TPC/NHC to the
Hydrometeorological Prediction Center (HPC) in Washington, D.C.
when the cyclone initially moved inland, weakened to a tropical
depression, and coastal warnings were discontinued. By then, the
primary threat had become mainly fresh water flooding due to the
heavy rainfall.
Operationally, HPC continued to issue products
through the remainder of Allison's track. Frequent coordination
calls occurred between HPC, TPC, and National Weather Service (NWS)
forecast offices during this period of highly-unusual cyclone
activity where the system was a tropical depression, subtropical
depression/storm, and then an extratropical cyclone. This included
the short (12 to 18 hour) period when gale force winds were
observed in association with the second center. While this
post-storm analysis shows Allison then as a subtropical system
(and, hence, technically the forecast responsibility of the
TPC/NHC), the decision for the HPC to retain forecast
responsibility is supported by the (1) need for consistency in
service source, (2) uncertainty in storm type, (3) short duration
of gale-force winds, and (4) center remaining mostly over land.
Acknowledgments
Some of the data in this report was furnished by the National
Climatic Data Center in Asheville, NC, various state emergency
management agencies, FEMA, National Weather Service Offices in
Houston, Lake Charles, New Orleans (Slidell), Mobile, Tallahassee,
Jacksonville, Atlanta, Columbia, Charleston, Newport/Morehead City,
Raleigh/Durham, Wakefield, Wilmington, Baltimore/Washington, and
Mount Holly (Philadelphia), and by the HPC.
Table 1: Best track for Tropical Storm Allison, 5 - 17 June 2001.
Date/Time (UTC) | Position | Pressure (mb) | Wind Speed (kt) | Stage |
Lat. (°N) | Lon. (°W) |
05 / 1200 | 27.5 | 95.0 | 1007 | 40 | tropical storm |
05 / 1800 | 28.5 | 95.3 | 1002 | 50 | " |
06 / 0000 | 29.3 | 95.3 | 1003 | 45 | " |
06 / 0600 | 30.1 | 95.2 | 1006 | 30 | tropical depression |
06 / 1200 | 31.0 | 95.2 | 1005 | 20 | " |
06 / 1800 | 31.5 | 95.0 | 1005 | 20 | " |
07 / 0000 | 31.6 | 95.0 | 1005 | 20 | " |
07 / 0600 | 31.8 | 94.9 | 1006 | 20 | " |
07 / 1200 | 31.4 | 94.9 | 1006 | 20 | " |
07 / 1800 | 31.1 | 95.0 | 1007 | 15 | " |
08 / 0000 | 30.9 | 95.6 | 1002 | 15 | " |
08 / 0600 | 30.7 | 96.1 | 1004 | 20 | " |
08 / 1200 | 30.4 | 96.2 | 1007 | 20 | " |
08 / 1800 | 30.2 | 96.1 | 1007 | 20 | " |
09 / 0000 | 29.9 | 95.9 | 1007 | 20 | " |
09 / 0600 | 29.6 | 95.8 | 1007 | 20 | " |
09 / 1200 | 29.3 | 95.8 | 1007 | 20 | " |
09 / 1800 | 28.9 | 95.6 | 1008 | 20 | " |
10 / 0000 | 28.6 | 95.2 | 1008 | 20 | subtropical depression |
10 / 0600 | 28.6 | 94.7 | 1007 | 25 | " |
10 / 1200 | 28.7 | 94.3 | 1006 | 25 | " |
10 / 1800 | 28.8 | 93.5 | 1006 | 30 | " |
11 / 0000 | 29.1 | 92.3 | 1005 | 30 | subtropical depression (New center) |
11 / 0600 | 30.0 | 90.5 | 1003 | 35 | subtropical storm |
11 / 1200 | 30.7 | 89.4 | 1000 | 40 | " |
11 / 1800 | 31.0 | 88.4 | 1002 | 35 | " |
12 / 0000 | 31.3 | 87.4 | 1004 | 25 | subtropical depression |
12 / 0600 | 31.8 | 86.1 | 1005 | 20 | " |
12 / 1200 | 32.4 | 84.7 | 1006 | 20 | " |
12 / 1800 | 32.8 | 83.6 | 1006 | 20 | " |
13 / 0000 | 33.1 | 82.6 | 1006 | 20 | " |
13 / 0600 | 33.4 | 81.6 | 1004 | 25 | " |
13 / 1200 | 33.7 | 80.7 | 1005 | 25 | " |
13 / 1800 | 34.0 | 79.6 | 1006 | 25 | " |
14 / 0000 | 34.3 | 78.5 | 1006 | 25 | " |
14 / 0600 | 34.6 | 77.9 | 1006 | 25 | " |
14 / 1200 | 34.7 | 77.7 | 1007 | 25 | " |
14 / 1800 | 34.6 | 77.6 | 1008 | 25 | " |
15 / 0000 | 34.6 | 77.2 | 1008 | 25 | " |
15 / 0600 | 34.9 | 77.0 | 1008 | 25 | " |
15 / 1200 | 35.5 | 76.9 | 1008 | 25 | " |
15 / 1800 | 35.9 | 76.8 | 1009 | 25 | " |
16 / 0000 | 36.3 | 76.6 | 1007 | 25 | " |
16 / 0600 | 36.6 | 76.2 | 1007 | 25 | " |
16 / 1200 | 36.8 | 75.9 | 1007 | 25 | " |
16 / 1800 | 37.2 | 75.5 | 1006 | 25 | " |
17 / 0000 | 37.8 | 75.4 | 1006 | 25 | " |
17 / 0600 | 38.6 | 74.5 | 1005 | 30 | " |
17 / 1200 | 39.3 | 73.4 | 1004 | 40 | subtropical storm |
17 / 1800 | 40.0 | 72.1 | 1005 | 35 | " |
18 / 0000 | 40.6 | 70.8 | 1006 | 30 | extratropical low |
18 / 0600 | 41.3 | 69.4 | 1008 | 30 | " |
18 / 1200 | 42.0 | 67.4 | 1009 | 30 | " |
18 / 1800 | 42.7 | 64.6 | 1011 | 25 | " |
19 / 0000 | 43.5 | 61.0 | 1012 | 20 | " |
19 / 0600 | | | | | dissipated |
05 / 2100 | 28.9 | 95.3 | 1003 | 45 | landfall near Freeport, TX |
11 / 0200 | 29.6 | 91.6 | 1004 | 30 | landfall near Morgan City, LA |
11 / 1200 | 30.7 | 89.4 | 1000 | 40 | minimum pressure |
Table 2:
Selected ship
reports with winds of at least 34 kt for Tropical Storm Allison,
5-17 June, 2001. "G" indicates peak gust.
Ship Name or Call Sign | Date/Time (UTC) | Lat. (°N) | Lon. (°W) | Wind dir/speed (deg/kt) | Pressure (mb) |
KDGR | 05 / 1200 | 25.0 | 89.8 | 100 / 34 | 1008.2 |
WTEJ | 05 / 1500 | 27.8 | 92.8 | 110 / 43G60 | 1010.7 |
WTEJ | 05 / 1600 | 27.8 | 92.7 | 120 / 40 | 1011.9 |
WTEJ | 05 / 1700 | 27.8 | 92.6 | 120 / 48 | 1011.1 |
WTEJ | 05 / 1800 | 27.7 | 92.5 | 120 / 44 | 1010.1 |
KDGR | 05 / 1800 | 24.5 | 88.1 | 110 / 34 | 1009.4 |
WTEJ | 05 / 1900 | 27.6 | 92.5 | 120 / 46 | 1009.9 |
WTEJ | 05 / 2000 | 27.6 | 92.4 | 120 / 40 | 1010.2 |
WTEJ | 05 / 2100 | 27.5 | 92.3 | 150 / 44 | 1010.5 |
WTEJ | 05 / 2200 | 27.4 | 92.2 | 140 / 40 | 1010.0 |
WTEJ | 05 / 2300 | 27.4 | 92.1 | 140 / 38 | 1009.9 |
|
Table 3: Tropical Storm Allison selected surface observations, 5 - 17 June 2001.
| Minimum Sea-level Pressure | Maximum Surface Wind Speed (kt) | |
Location | Date/ Time (UTC) | Press. (mb) | Date/ Timea
(UTC) | Sust. Windb
(kts) | Peak Gust (kts) | Storm Surgec
(ft) | Storm Tided
(ft) | Rain (storm total) (in) |
Alabama |
Evergreen (KGZH) | 12/0018 | 1004.4 | 11/2201 | 19 | 28 | | | |
Mobile/Brookley (KBFM) | 11/1853 | 1006.55 | 11/1353 | 23 | | | | |
Mobile/Brookley (KBFM) | | | 11/1309 | | 38 | | | |
Mobile (KMOB) | 11/1556 | 1005.7 | 11/1230 | 24 | 46 | | | |
Delaware |
Dover AFB (KDOV) | | | | | | | | 3.94 |
Georgetown (KGED) | 17/0754 | 1008.1 | 17/0954 | 17 | 28 | | | |
Greenwood | | | | | | | | 4.08 |
Florida |
Pensacola (KPNS) | 11/2153 | 1007.3 | 11/1346 | 30 | 36 | | | |
Tallahassee (KTLH) | | | | | | | | 10.13 |
Georgia |
Siloam | | | | | | | | 5.75 |
Louisiana |
Acadiana (KARA) | 06/1047 | 1010.2 | 05/1905 | 24 | 31 | | | |
Alexandria (KAEX) | 06/2333 | 1008.8 | 05/1927 | 23 | 33 | | | |
Barataria Bay (USGS) | | | 06/0545 | | 37 | | | |
Bootheville (KBVE) | 11/0931 | 1005.4 | 11/0920 | 26 | 39 | | | |
Cameron | | | | | | 2.5 | | |
Door Point (USGS) | | | 11/0400 | | 36 | | | |
Grand Pass (USGS) | | | 11/0400 | | 38 | | | |
Lake Charles (KLCH) | 06/0912 | 1008.5 | 05/1906 | 27 | 31 | | | |
Lafayette (KLFT) | | | | | | | | 15.58 |
Morgan City | | | | | | | | 20.96 |
NE Bay Gardene (USGS) | | | 11/0354 | | 46 | | | |
NOLa Moisant (KMSY) | 11/0739 | 1003.7 | | 24 | 29 | | | |
NOLa Lakefront (KNEW) | 11/0753 | 1003.7 | 11/0854 | 33 | 38 | | | |
Salt Point (KP92) | 06/1021 | 1009.8 | 05/1305 | | 35 | | | 27.55 |
Slidell (KASD ) | 11/0905 | 1002.0 | | 19 | 28 | | | |
Thibodaux | | | | | | | | 29.86 |
WFO Slidell | | | | | | | | 21.35 |
Maryland |
Denton | | | | | | | | 7.50 |
Salisbury (KSBY) | 17/0754 | 1007.8 | 17/1854 | | 23 | | | |
Mississippi |
KBIX (Keesler AFB) | 11/1053 | 1005.3 | 11/1040 | 34 | 55 | | | |
KGPT (Gulfport/Biloxi) | | | 11/0914 | 28 | 38 | | | 11.99 |
New Jersey |
Absecon | | | | | | | | 4.60 |
Atlantic City (KACY) | 17/1241 | 1008.8 | 17/1246 | 28 | 36 | | | |
Atlantic City (KACY) | | | 17/1313 | 21 | 36 | | | |
Atlantic City (KACY) | | | 17/1431 | 26 | 34 | | | |
Chatham | | | | | | | | 4.30 |
Howell | | | | | | | | 4.86 |
Margate | | | | | | | | 4.00 |
Millville (KMIV) | 17/0754 | 1009.4 | 17/1437 | | 24 | | | |
Verga | | | | | | | | 4.40 |
Wertzville | | | | | | | | 4.33 |
North Carolina |
Askewville | | | | | | | | 8.50 |
Pennsylvania |
Abington | | | | | | | | 9.00 |
Chanfont | | | | | | | | 10.17 |
Doylestown | | | | | | | | 9.35 |
Horsham | | | | | | | | 8.00 |
Willow Grove (KNXX) | | | | | | | | 10.16 |
South Carolina |
Columbia FD | | | | | | | | 12.00+ |
Texas |
Alvin | | | | | | | | 11.23 |
Anahuac | | | | | | | | 12.50 |
Angleton (KLBX) | 06/0223 | 1004.1 | 05/2229 | | 23 | | | |
Beaumont (KBPT) | 06/0929 | 1006.8 | 05/1520 | 31 | 36 | | | |
Bellaire | | | | | | | | 11.25 |
Brays Bayou (Stella Link) | | | | | | | | 19.72 |
Brays Bayou (Lawndale) | | | | | | | | 21.46 |
Buffalo Bayou | | | | | | | | 23.54 |
Chigger Creek (Windsong) | | | | | | | | 18.78 |
Clear Creek (Tele. Rd.) | | | | | | | | 20.04 |
College Station (KCLL) | 06/1014 | 1006.8 | | | | | | 3.49 |
Conroe | | | | | | | | 18.08 |
Conroe (KCXO) | 06/0757 | 1002.7 | 06/0444 | | 26 | | | 17.48 |
Cypress Creek (at Grant) | | | | | | | | 21.41 |
Deer Park | | | | | | | | 22.99 |
Coward Creek (at Baker) | | | | | | | | 27.95 |
Dickinson | | | | | | | | 14.48 |
Eagle Point (port) | 06/0230 | 1005.4 | 05/2130 | 37 | 42 | | | |
Ellington Field (KEFD) | 06/0250 | 1004.4 | 06/0130 | 20 | 44 | | | |
Freeport | | | | | | | | 12.12 |
Friendswood | | | | | | | | 25.98 |
Furr H.S. (Harris Co.) | | | | | | | | 35.14 |
Galveston (KGLS) | 06/0215 | 1004.4 | 05/2123 | 33 | 40 | | | 9.77 |
Galveston Bay, N. Jetty | 06/0012 | 1002.9 | 05/2116 | 35 | 42 | 1.8 | | |
Galveston Pleasure
Pier | 06/0130 | 1003.7 | 05/2118 | 38 | 45 | 2.1 | | |
Garners Bayou (B'tway
8) | | | | | | | | 24.61 |
Greens Bayou (US 59) | | | | | | | | 35.76 |
Harris Co. Museum N.S. | | | | | | | | 20.83 |
Heights (Harris Co.) | | | | | | | | 32.00 |
Houston Hobby (KHOU) | 06/0253 | 1004.4 | 05/2005 | 27 | | | | 18.77 |
Houston Hobby (KHOU) | | | 05/2254 | | 33 | | | |
Houston Int'cntl (KIAH) | 06/0413 | 1003.0 | 06/0313 | 21 | 28 | | | 16.48 |
Hunting Bayou (Houston) | | | | | | | | 35.75 |
Huntsville (KUTS) | 06/0943 | 1003.7 | | | | | | 12.16 |
Imperial Sugar | | | | | | | | 15.57 |
Jamaica beach | 06/0100 | 1004.3 | | | | | | 12.13 |
Kingwood | | | | | | | | 21.00 |
La Porte | | | | | | | | 18.86 |
League City (NWS HGX) | 06/0300 | 1005.6 | 05/2100 | | 25 | | | 19.41 |
Little Vince (at Jackson) | | | | | | | | 22.40 |
Missouri City | | | | | | | | 10.98 |
Morgans Point ( port) | 06/0300 | 1004.6 | 06/0318 | 27 | 36 | 1.2 | | |
Palacios
(KPSX) | 06/0048 | 1005.8 | 06/0003 | | 24 | | | |
Pearland (KLVJ) | 06/0300 | 1004.1 | 05/2216 | 26 | 32 | | | 21.41 |
Pennington | | | | | | | | 15.60 |
Port of Houston | | | | | | | | 36.99 |
Sabine Pass | | | | | | 2.5 | | |
Sugarland (KSGR) | 06/0336 | 1005.4 | 05/2225 | | 25 | | | 9.61 |
Sugarland City Hall | | | | | | | | 15.31 |
Tomball | | | | | | | | 16.20 |
Tomball (KDWH) | 06/0559 | 1003.4 | 06/0409 | 21 | 29 | | | 13.14 |
Vince Bayou (W. Ellaine) | | | | | | | | 25.31 |
Westheimer (Houston) | | | | | | | | 33.00 |
Westbury | | | | | | | | 19.53 |
White Oak Bayou (Ella) | | | | | | | | 18.19 |
Winnie | | | | | | | | 16.58 |
Virginia |
Wallops Island
(KWAL) | 17/0154 | 1006.3 | 16/2103 | 16 | 23 | | | |
C-MAN Stations |
ALSN6 (40.5N 73.8W) | 17/1800 | 1010.8 | 17/1650 | 28 | 30 | | | |
BURL1 (28.9N 89.4W) | 11/1100 | 1004.5 | 11/1110 | 41 | | | | |
BURL1 (28.9N 89.4W) | | | 11/1121 | | 49 | | | |
BURL1 (28.9N 89.4W) | 11/1200 | 1004.5 | | | | | | |
CHLV2 (36.9N 75.7W) | 16/1000 | 1007.5 | 16/1610 | 33 | 34 | | | |
CLKN7 (34.6N 76.5W) | 14/0800 | 1009.1 | 14/0600 | | 53 | | | |
CSBF1 (29.7N 85.4W) | | | 12/0442 | | 35 | | | |
DPIA1 (30.3N 88.1W) | 11/1600 | 1007.5 | 11/1420 | 31 | 44 | | | |
DSLN7 (35.2N 75.3W) | 14/0900 | 1013.0 | 14/1400 | | 36 | | | |
GDIL1 (29.3N 90.0W) | 11/0900 | 1005.1 | 11/0850 | 34 | 45 | | | |
SRST2 (29.7N 94.1W) | | | 05/1450 | 41 | 53 | | | |
TPLM2 (38.9N 76.4W) | 16/2100 | 1011.0 | | | | | | |
Moored Buoys |
42007 (30.1N 88.8W) | | | 11/1120 | 34 | | | | |
42007 (30.1N 88.8W) | | | 11/1108 | | 49 | | | |
42019 (27.9N 95.4W) | | | 05/1300 | 27 | 33 | | | |
42035 (29.3N 94.4W) | | | 05/1500 | 31 | 41 | | | |
42040 (29.2N 88.2W) | 11/1100 | 1008.4 | 11/1600 | 33 | | | | |
42040 (29.2N 88.2W) | | | 11/1541 | | 41 | | | |
44004 (38.5N 70.5W) | 17/2100 | 1011.7 | 17/2310 | 29 | 33 | | | |
44008 (40.5N 69.4W) | 18/0400 | 1007.0 | | | | | | |
44009 (38.5N 74.7W) | 17/1000 | 1004.4 | 11/1330 | 31 | 33 | | | |
44011 (41.1N 66.6W) | 18/1000 | 1008.8 | | | | | | |
44014 (36.6N 74.8W) | 16/0900 | 1009.1 | | | | | | |
44025 (40.3N 70.2W) | 17/1800 | 1008.3 | 17/1800 | 27 | 33 | | | |
Oil Rig Platforms |
K7B5 (28.1N 93.2W) | | | 05/1400 | 40 | 50 | | | |
K3B6 (28.0N 92.8W) | | | 10/1445 | 42 | | | | |
K7R8 (28.3N 92.0W) | | | 10/1542 | | 35 | | | |
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Figure 1:
Best track positions for Tropical Storm Allison, 5-17 June 2001.
Figure 2:
Best track maximum sustained surface wind speed curve for Tropical Storm
Allison, 5-17 June 2001. Aircraft observations have been adjusted
for elevation using an 85% reduction factor for observations at
1500 ft. Wind curve is based primarily on surface observations
after 1200 UTC 6 June.
Figure 3:
Best track minimum central pressure curve
for Tropical Storm Allison, 5-17 June 2001. Pressure curve is based
on surface observations after 0600 UTC 6 June. Estimates during the
extratropical stage are based on analyses from the NOAA Marine
Prediction Center.
Figure 4:
1227 UTC 11 June 2001 radar reflectivity
image from Mobile, AL. Note the eye-like feature over
southern Mississippi and the squall line to the east.
The intensity was near 40 kt at this time.
Figure 5:
Storm total rainfall (in) for the Houston
metropolitan area (data provided by the Harris Co., TX
Office of Emergency Management).
Figure 6:
Storm total rainfall for Tropical Storm
Allison during the period 4-18 June 2001. Rainfall data were
obtained from the standard rainfall reporting network. This map
does not include some isolated amounts, which were up to nearly 37
inches.
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