Tyler's weather records date to 1896. Compared with October 2008, the month was 1.0 deg. Cooler, and 9.19 inches wetter. Year-to-date rainfall was 1.93 inches greater in 2008 than thus far in 2009. In both years, Tyler had already exceeded its normal yearly rainfall by the end of October. Five major rain events affected the area during the month, with numerous instances of flooded roads. All of the area's rivers were in minor to moderate flood for most of the month. The thirty-day outlook had called for near normal temperatures and near normal precipitation.
The week September 27-October 3 saw temperatures about 3 degrees below normal, and rainfall about one-half normal. Tropical Maritime air early in the week was replaced by a Pacific cold front on the 29th, which lowered temperatures. A stronger front on the 1st lowered readings further, and brought a line of thunderstorms that evening. The front became stationary, combining with southwest winds aloft and moisture from dissipating Eastern Pacific Tropical Storm Olaf to return rain the afternoon of the 3rd, which continued into the following week. The week's average temperature was 70.0, and rainfall was 0.46 inch. This was 0.5 deg. Cooler than the previous week. Compared with the same week in 2008, the week was 0.8 deg. Warmer, and there was no rainfall last year.
The week October 4-10 saw temperatures about 2 degrees below normal, and rainfall about 400 percent of normal. Two wet storm systems crossed the region one on the 4th and the second on the 9th. Both resulted in widespread heavy rainfall. Both systems brought cooler air, which was replaced at mid-week when the first cold front came back northward as a warm front. There were reports of severe weather with the system of the 9th. The week's average temperature was 67.7, and rainfall was 3.69 inches. This was 2.3 degrees cooler than the previous week. Compared with the same week in 2008, the week was 0.2 deg. Cooler, and 3.03 inches wetter.
The week October 11-17 was about 5 degrees cooler than normal, and rainfall was about 300 percent of normal. More heavy rain struck the area early in the week, when a slow-moving storm system combined with ample moisture and a cold front. Temperatures started the week cool, warmed at mid-week, then cooled again at the weekend. The week's average temperature was 63.4 deg., and rainfall was 3.22 inches. This was 4.3 deg. Cooler than the previous week. Compared with the same week in 2008, the week was 5.0 deg. Cooler, and 0.51 inch wetter.
The week October 18-24 saw temperatures about 7 degrees below normal, and rainfall again about 300 percent of normal. Heavy and flooding rains again struck the area on the 22nd, with amounts of two to five inches common. The week began cool, warmed with Tropical Maritime air at mid-week ahead of the storm of the 22nd, then cooled again at late-week behind the accompanying cold front. The week's average temperature was 59.3 deg., which was 4.1 deg. Cooler than the previous week. Rainfall was 3.06 inches. Compared with the same week in 2008, the week was 2.0 deg. Cooler, and 2.93 inches wetter. The week October 25-31 saw temperatures about 3 degrees below normal, and rainfall about 300 percent of normal.
Two wet storms crossed the region, resulting in instances of flooding on both occasions. The storm of the 26th-27th brought rains of two to five inches, while the system of the 29th-30th brought rains of one to eight inches. With the first system, rainfall was evenly distributed, while the second saw amounts increase from northwest to southeast. The second storm also resulted in considerable severe weather over the southeastern counties, and numerous road closings including some main highways. Cooler air followed the second system, ending the month on a clear and cool note.
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.
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October 2009, RECORDS AND SUMMARY: