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November 2005 - Report and Summary

The month of November 2005 was warmer and much drier than normal. East Texas continued in severe to extreme drought at month's end. November 2005, though not ranking among the five warmest Novembers, was the warmest since 1973, when the month's average was 0.7 deg. warmer than that in November 2005. The Fall season was, like November, very warm and very dry. Rainfall for the season totaled 4.72 inches, which was 36.7 percent of normal. The mean Fall temperature was 070.4 deg. This was 3.0 deg. warmer than normal.

November divided itself into two halves meteorologically. Through the 15th, the month was very warm with three record high temperatures tied or set. Rain did not fall until the 15th, and then but 0.03 inch. Colder air arrived on that morning, and the remainder of the month was cool--and also dry. The reason for the change was an eastward shift in the position of an upper air high pressure from the Bering Sea and North Pacific to over Western North America. When the ridge was in its early-month position, the Sub-Tropical high pressure ridge kept the region in its grip. This resulted in warm temperatures. In its late-month position, winds aloft were northwesterly and cold air outbreaks came down the Plains with some regularity.

The growing season ended with the first freeze on the morning of the 17th. The 2005 season was 244 days in length--exactly normal. Compared with November 2004, the month was 3.0 deg. warmer, and 4.31 inches drier. Year-to-date rainfall through the end of the month was 19.22 inches less in 2005 than in 2004. The thirty-day outlook for the month had called for above normal temperatures and near normal precipitation.

The week October 30-November 5 saw temperatures about 2 deg. above normal, and near normal rainfall. A cold front and storm system crossed on the 31st. This brought the week's only rain, and lowered temperatures through the 4th. On the 4th, upper air high pressure built back over the region, starting a six-day period of much above normal temperatures which persisted into the middle of the following week. The week's average temperature was 64.1 deg., and precipitation was 1.10 inches. The week was 7.9 deg. warmer than the previous week. Compared with the same week in 2004, the week was 2.2 deg. warmer, and 0.12 inch wetter.

The week November 6-12 was much warmer than normal and saw no rainfall. Tropical Maritime air was over the area for most of the week. A weak cold front on the 10th with a crossing upper air storm lowered temperatures slightly, but a temperature inversion prevented any rain from falling. Record high temperatures occurred on the 8th and 9th. The week's average temperature was 72.7 deg., about 13 deg. warmer than normal. This was 8.6 deg. warmer than the previous week. Compared with the same week in 2004, the week was 14.4 deg. warmer, and 0.01 inch drier.

The week November 13-19 saw near normal temperatures, and rainfall about 5 percent of normal. The Tropical Maritime air mass, which had dominated the area's weather for the first half of the month, was replaced by Polar Continental air on the 15th. The cold front and upper air low which crossed on that date brought the week's only rainfall. Record high temperatures of the 13th were replaced by temperatures running well below normal for the last half of the week. In fact, the first freeze of the season occurred on the morning of the 17th. The week's average temperature was 57.7 deg., which was 15.0 deg. colder than the previous week. Rainfall was 0.03 inch. Compared with the same week in 2004, the week was 3.6 deg. cooler, and 1.77 inches drier.

The week November 20-26 saw near normal temperatures and rainfall about 5 percent of normal. Cold fronts on the 20th and 24th kept temperatures seasonal. There was a sharp warm-up on the afternoon of the 23rd with the dry air mass and downslope southwesterly wind ahead of the next day's front. The front of the 24th retreated northward as a warm front on the 26th. It combined with an upper air low to generate the week's only rainfall. Along the immediate Texas Coast, amounts were generally in excess of one inch, though only a few hundredths of an inch were recorded in the Tyler area. The week's average temperature was 55.7 deg., which was 2.0 deg. Cooler than the previous week. Rainfall was 0.03 inch. Compared with the same week in 2004, the week was 1.6 deg. Cooler and 1.82 inches drier.

A severe weather event on the afternoon of the 27th heralded the arrival of a cold front. This held down temperature until warming on the 30th. The week's rainfall occurred on the afternoon of the 27th, with reports of small hail from parts of Smith County. Farther to the northeast, there were numerous reports of severe weather. Strong winds blew on the afternoon of the 27th ahead of the front. Tyler’s peak gust was 46 mph with the thunderstorm, and 39 mph earlier in the day.

The reporting period for temperatures and phenomenon on each day is for the twenty-four hours ending at midnight hours GMT--6 p.m. CST and 7 p.m. CDT. The reporting period for precipitation is for the twenty-four hours ending at noon GMT--6 a.m. CST and 7 a.m. CDT. All times are given using the twenty-four hour clock, and are expressed in Greenwich Mean Time.

Observations are from NWS Station 41/9207/4 in Tyler, Texas. The term "normal" refers to averages from the standard climatic period 1971-2000.

November 2005



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