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Winter Outlook
December 2006 - February 2007

Winter Temperature Outlook
Winter Precipitation Outlook

by Glenn Carrin

The official Winter Outlook from the Climate Prediction Center places northwest Louisiana, southwest Arkansas, northeast Texas, and southeast Oklahoma in a very typical regime. That is, there are equal chances that this winter will be above, below, and near normal for both temperature and precipitation. Here are their graphics:

However, a WFO Shreveport climate study of the local impacts from certain Atlantic and Pacific Ocean sea surface temperature (SST) oscillations provides another look into the upcoming winter.

Of the three SST oscillations considered, the tropical Pacific has begun a warm phase, while the North Atlantic remains in a decade-long warm regime. The forecast difficulty comes from the North Pacific which has been in a generally warm regime for several years, but with occasional temporary departures to a cool phase. Such a cool phase began in August, and will probably last until November. For our forecast we will assume that a return to a warm regime in the North Pacific will occur by the winter.

Thus, in Shreveport, when all three SST oscillations are in a warm phase, we climatologically experience temperatures which are about a degree cooler than normal, precipitation which is about an inch and a half below normal for the season, and a slightly less active severe weather season.


The Drought of 2005-06 Continues…

An Iso-analysis of rainfall totals across the four-state region from January 2006 through September 2006. Toledo Bend Reservoir in early October 2006, nearly 11 feet below normal. Pictures courtesy of Mr. Wiley Butler.
(Top) An Iso-analysis of rainfall totals across the four-state region from January 2006 through September 2006.

(Bottom) A look at how the drought has affected areas such as the Toledo Bend Reservoir. The reservoir was some 11 feet below normal pool stage in early October. Photo courtesy of Mr. Wiley Butler.
Moderate to extreme drought conditions have persisted across Southeast Oklahoma, Southwest Arkansas, Northeast Texas, and much of Northwest Louisiana since late spring of 2005. Although drought conditions did ease from January to March of 2006, below normal rainfall has fallen almost every month since then. As a result, the ongoing drought has worsened over the late spring and summer months, with severe and extreme drought conditions shifting from Southeast Oklahoma and Southwest Arkansas, into much of Northern and Northeast Texas, where only 20 to 25 inches of rain has fallen this year, through the end of September. This is some 10 to 15 inches below normal, and only 30-50% of normal. Drought conditions ease farther east into Southwest Arkansas and Northern Louisiana, where 25 to 35 inches of rain has fallen for the year, but still some 3 to 12 inches below normal.

The accumulated warmer than normal summer temperatures experienced area-wide contributed to the deteriorating drought conditions as well, as many locations experienced on average 11 to as many as 22 days where afternoon temperatures topped the century mark. Only random afternoon showers and thunderstorms occurred during the summer months, providing some brief relief to isolated locations. The above normal temperatures and lack of rainfall through much of this year have contributed to the continued burns bans across the region, as well as water conservations measures in place mainly across communities of East Texas and Northwest Louisiana. Area lakes, river, and bayous continue to slowly recede, with all area reservoirs having fallen below their normal conservation pool stages, with the most significant impacts being felt across the Northeast Texas reservoirs in the Red, Sabine, Sulphur, and Neches River basins. Gauge sites along the Sabine River have recorded record low stages from Gladewater, to Beckville, and Logansport. Broken Bow Lake, Lake of the Pines, Caddo Lake, Black Lake, Lake Fork, Lake Jacksonville, and Sam Rayburn Lake have all recorded current pool stages some three to six feet below their normal pool stages, while Lake Bob Sandlin, Bodcau Lake, Martin Lake, and Lake Tyler are currently seven to nine feet below normal pool stage�the exception being Bodcau Lake, which is nearly twelve feet below normal.

The drought continues to significantly impact the area economically and agriculturally. For a second straight year, hay supplies and harvests have been short across much of East Texas, only producing a third of their normal yield. This has resulted in increased hay prices, and have required some farmers to buy hay out of state, or to completely liquidate their herds due to the increasing expenses of supplying supplemental feed and acquiring hay out of state. Smaller herd sizes will curtail beef supplies, while the lack of adequate nutrition for cows will mean a smaller calf crop next year. Many ponds, tanks, and creeks remain well below normal, if not completely dry, across several East Texas counties. Some help is in the offing, however, as the Texas Department of Agriculture will administer financial assistance to eligible livestock producers in 216 drought-stricken counties throughout the state.

The possibility of a developing El Nino in the equatorial Pacific will ultimately determine the precipitation and temperature patterns on the Four State Region this fall/winter. Should the El Nino be strong enough, this would favor above normal wintertime rainfall and below normal wintertime temperatures from November through February.

The following table indicates the accumulated rainfall, their departures, and percentage of normal since the drought began last May, 2005, with totals ending on September 30th, 2006, a 17 month running total:

Location

17-Month Rainfall Total:
May 1, 2005 - Sept. 30, 2006

Departure From Normal
% Normal
Shreveport, LA
48.11
-23.40
67%
Monroe, LA
54.39
-18.60
75%
Texarkana, AR
42.95
-22.80
65%
Lufkin, TX
40.34
-25.51
61%
Tyler, TX
35.72
-25.51
58%
Longview, TX
39.87
-28.36
58%
El Dorado, AR
41.68
-33.74
55%
DeQueen, AR
43.07
-33.70
56%

 

 



Volume III, Issue 2
Winter 2006-2007


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