September 2008 was cooler and wetter than normal.
Hurricane Gustav crossed to the east of the region on the 1st, and Ike directly through the region on the 13th. Both were followed by cool air masses. For the last half of the month, upper air high pressure blocked storm systems from reaching the area. Compared with September 2007, the month was 5.8 deg. Cooler, and 6.26 inches drier. Year-to-date rainfall through September 30 was 5.72 inches less in 2008 than in 2007, though these values were well above normal in both years. The thirty-day outlook had called for near normal temperatures and near normal precipitation.
The week August 31-September 6 saw temperatures about 5 degrees below normal, and rainfall about 150 percent of normal. Hurricane Gustav moved slowly along the Texas-Louisiana border between the 1st and 4th, with general rains which increased from a few hundredths of an inch over the west to several inches over the east. Afterwards, a cold front moved into the region on the 4th, ending the week with mild and dry weather. The week's average temperature was 76.0, which was 6.1 deg. Cooler than the previous week. Rainfall was 1.09 inches. Compared with the same week in 2007, the week was 5.6 deg., cooler, and 0.55 inch wetter.
Hurricane Ike dominated the area's weather during most of the week September 7-13. The area came under the outer fringe of his circulation on the 10th, keeping temperatures warm and suppressing rainfall. On the 9th, an old frontal boundary combined with an upper air low to produce heavy rains over much of the area, with record rainfall in Tyler. On the morning of the 13th, he came ashore at Point Bolivar, causing immense damage along the coast and on Galveston Island. Ike moved rapidly northward through East Texas, with the eye crossing Tyler around3 p.m. on the 13th. The highest wind gust in Tyler was 46 mph, and tropical storm force winds blew for about seven hours. There were numerous downed trees, and power failures affected about 11 percent of Smith County's residents. Power failures were about 25 percent in the area, and were concentrated south of a Rusk-Carthage line. The week's average temperature was 78.0 which was 1 degree below normal. Rainfall was 5.06 inches, about 700 percent of normal. The week was 2.0 degrees warmer than the previous week, and 0.2 deg. Cooler than the same week in 2007. There was no rainfall during the week in 2007.
Ike's departure brought a strong cold front into the area, which held temperatures far below normal for much of the week September 14-20, with warming towards the end of the week. The dry northerly to northeasterly flow kept moisture out of the area, and no rain fell. The week's average temperature was 69.1, 8 degrees cooler than normal, and 8.9 deg. Cooler than the previous week. Rainfall was 0.65 inch, about 90 percent of normal. The week was 8.5 deg. Cooler than the same week in 2007, and there was no rain in that year, either.
A dry and stable weather pattern was in control for the entire week of the 21-27. Surface high pressure extended from the Canadian Maritimes southwestward, and upper air high pressure was to the west of the region. This brought fair skies, seasonal temperatures for most of the week, and suppressed any rainfall. A weak cold front on the 25th lowered readings to below normal levels. The week's average temperature was 73.0 deg., which was 2 degrees below normal, and 3.9 degrees warmer than the previous week. The week was 6.2 degrees cooler than the same week in 2007. There was no rain during the week in either 2008 or 2007. The final three days of the month were dry, with a cold front on the 30th lowering temperatures.
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.
MX MN OBS PCPN REMARKS
September 2008, RECORDS AND SUMMARY: