Tropical Cyclone Public Advisory
(MIATCPAT1-5, MIATCPEP1-5)
The Tropical Cyclone Public Advisory contains a list of all current
watches and warnings on a tropical or subtropical cyclone. It also gives
the cyclone position in terms of latitude and longitude coordinates and
distance from a selected land point or island, as well as the current
motion. The advisory includes the maximum sustained winds in miles per hour
and the estimated or measured minimum central pressure in millibars and
inches. The advisory may also include
information on potential storm tides,
rainfall or tornadoes associated with
the cyclone, as well as any pertinent weather observations.
Public advisories are issued for all Atlantic tropical or subtropical
cyclones, and for eastern Pacific tropical or subtropical cyclones that are
threatening land. Public advisories are normally issued every six hours.
They may be issued every two or three hours when coastal watches or warnings
are in effect. Special public advisories may be issued at any time due to
significant changes in warnings or in the cyclone.
The most current Public Tropical Cyclone Advisories are found on the
Active Storm Advisories page and the
Tropical Cyclone Products page. They issued under the following
World Meteorological Organization (WMO)
and AFOS headers:
The numbers 1-5 are assigned by cyclone number, i.e., advisories on the first, sixth, or eleventh cyclones
of the Atlantic season would be sent under the WMO header WTNT31 KNHC;
advisories on the second, seventh, or twelth cyclones of the Atlantic season would be sent under the
WMO header WTNT32 KNHC, and so on.
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Tropical Cyclone Forecast/Advisory
(MIATCMAT1-5, MIATCMEP1-5)
The Tropical Cyclone Forecast/Advisory contains a list of all current
watches and warnings on a tropical or subtropical cyclone, as well as the
current latitude and longitude coordinates, intensity, and system motion. The advisory contains forecasts of
the cyclone positions, intensities, and wind fields for 12, 24, 36, 48, and 72 hours from the current synoptic
time. The advisory may also include information on any pertinent storm tides
associated with the cyclone. All wind speeds in the forecast advisory in given in knots (nautical miles per
hour).
Forecast/Advisories are issued on all Atlantic and eastern Pacific
tropical and subtropical cyclones every six hours. Special
Forecast/Advisories may be issued at any time due to significant changes in
warnings or in the cyclone.
The most current Tropical Cyclone Forecast/Advisory is found on the
Active Storm Advisories page and the
Tropical Cyclone Products page.
They are issued under the following WMO
and AFOS headers:
The numbers 1-5 are assigned by cyclone number, i.e., advisories on the
first, sixth, or eleventh cyclones
of the Atlantic season would be sent under the WMO header WTNT21 KNHC;
advisories on the second, seventh, or twelth cyclones of the Atlantic season would be sent under the
WMO header WTNT22 KNHC, and so on.
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Tropical Cyclone Discussion
(MIATCDAT1-5, MIATCDEP1-5)
The Tropical Cyclone Discussion explains the reasoning for the analysis
and forecast of a tropical or subtropical cyclone. It includes a table of
the forecast track and intensity.
Tropical Cyclone Discussions are issued on all Atlantic and eastern Pacific
tropical and subtropical cyclones every six hours. Special tropical cyclone discussions may be issued at any
time due to significant changes in warnings or in the cyclone.
The most current Tropical Cyclone Discussion is found on the
Active Storm Advisories page and the
Tropical Cyclone Products page.
They are issued under the following WMO and AFOS
headers:
The numbers 1-5 are assigned by cyclone number, i.e., discussions on the
first, sixth, or eleventh
cyclones of the Atlantic season would be sent under the WMO header
WTNT41 KNHC; discussions on the second, seventh, or twelth cyclones of the Atlantic season would be sent
under the WMO header WTNT42 KNHC, and so on.
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Tropical Cyclone Strike Probabilities
(MIASPFAT1-5, MIASPFEP1-5)
The Tropical Cyclone Strike Probabilities give the percentage chance of
a tropical or subtropical cyclone passing within 75 nm to the right or
within 50 nm to the left of a specified point, looking in the direction of cyclone motion. The probabilities
are give for the time periods 0-24, 24-36, 36-48, and 48-72 hours, with a 0-72 hour given by adding the
indivdual probabilities together.
Tropical Cyclone Strike Probabilities are normally issued for Atlantic
tropical or subtropical cyclones every six hours when the system is forecast
to be within 72 hours of landfall. Special Strike Probabilities may be
issued if Special Public/Forecast Advisories are issued.
The most current Tropical Cyclone Strike Probabilities are found on the
Active Storm Advisories page and the
Tropical Cyclone Products page. They are issued on WMO headers WTNT71-75 KNHC and
AFOS headers MIASPFAT1-5.
The numbers 1-5 are assigned by cyclone number, i.e., probabilities on the
first, sixth, or eleventh
cyclones of the Atlantic season would be sent under the WMO header
WTNT71 KNHC; probabilities on the second, seventh, or twelth cyclones of the Atlantic season would be sent
under the WMO header WTNT72 KNHC, and so on.
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Tropical Cyclone Position Estimates
(MIATCEAT, MIATCEEP)
Tropical Cyclone Position Estimates are issued between 2-hourly intermdiate
advisories whenever a
tropical cyclone with a well-defined radar
center is within 200 nautical miles of land-based radar in the United States. These estimates give the
center location in map coordinates and distance and direction from a well-known point.
Atlantic Tropical Cyclone Position Estimates are issued under the WMO
header WTNT51 KNHC and AFOS header MIATCEAT. Eastern Pacific Tropical Cyclone
Position Estimates (a rarely used product) are issued under WMO header
WTPZ51 KNHC and AFOS header MIATCEEP.
The most current Tropical Cyclone Position Estimate is found on the
Active Storm Advisories page and the
Tropical Cyclone Products page.
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Tropical Weather Outlook
(MIATWOAT, MIATWOEP)
The Tropical Weather Outlook is a discussion of significant areas of
disturbed weather and their potential for development out to 48 hours. It
includes (when possible) a nontechnical explanation of the meteorology
behind the outlook.
Tropical Weather Outlooks also include a brief descriptions of any tropical
or subtropical cyclones in
the region. It also includes the WMO and AFOS headers of where to find more
information on an active cyclone during the first 24 hours of existence.
Tropical Weather Outlooks are issued four times a day during the hurricane
season. Atlantic outlooks are transmitted under WMO header ABNT20 KNHC
and AFOS header MIATWOAT. Eastern Pacific outlooks are transmitted under
WMO header ABPZ20 KNHC and AFOS header MIATWOEP.
The most current Tropical Weather Outlook is found on the
NHC home page page and the
Tropical Cyclone Products page.
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Special Tropical Disturbance Statement
(MIADSAAT, MIADSAEP)
Special Tropical Disturbance Statements are used to furnish information on
strong formative, nondepression systems. These are usually issued for
systems strong enough to produce heavy rains and strong winds that do not
yet meet the criteria of tropical or subtropical cyclones. These products
are transmitted only as needed.
Atlantic Special Tropical Disturbance Statements are issued under WMO
header WONT41 KNHC and AFOS header MIADSAAT. Eastern Pacific
Special Tropical Disturbance Statements are issued under WMO
header WOPZ41 and AFOS header MIADSAEP.
The most current Special Tropical Disturbance Statement is found on the
Active Storm Advisories page and the
Tropical Cyclone Products page.
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Monthly Tropical Weather Summary
(MIATWSAT, MIATWSEP)
The Monthly Tropical Weather Summary is issued on the first of every month during the
hurricane season. It describes the previous month's
tropical cyclone actvity and gives details on the cyclones as known at
that time. The last Tropical Weather Summary of the season gives an brief account of the whole season.
Atlantic Tropical Weather Summaries are issued under WMO and AFOS header
ABNT30 KNHC and MIATWSAT. Eastern Pacific Tropical Weather Summaries are
issued under WMO header ABPZ30 KNHC and AFOS header MIATWSEP.
The most current Monthly Tropical Weather Summary is found on the
NHC home page and the
Tropical Cyclone Products page.
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![[Hurricane]](https://webarchive.library.unt.edu/eot2008/20080917073616im_/http://www.nhc.noaa.gov/graphics/test2.gif){kind=small}
![[NCEP Logo]](https://webarchive.library.unt.edu/eot2008/20080917073616im_/http://www.nhc.noaa.gov/graphics/ncep.gif)