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September 2013 - Report and Summary

The thirty-day outlook had called for near normal temperatures and near normal precipitation. The late-August revision made no changes for East Texas in the monthly outlook.

The month of September 2013 was much warmer and much wetter than normal. Compared with September 2012, the month was 3.0 deg. Warmer, and1.14 inches wetter. Year-to-date rainfall was 2.97 inches less in 2013 than in 2012.

The month of September began hot, and temperatures continued running above normal until mid-month. Persistence of the upper air high pressure ridge was responsible, though it shifted east of the area by the 8th, and then returned. This resulted in day-to-day fluctuations in temperatures, which were uniformly 3-8 degrees above normal.

A cold front dissipated in the area on the 2nd, resulting in showers and thunderstorms on the 1st and 2nd. Another front came into the area on the 13th, resulting in additional shower activity. The sea-breeze was fairly active between the 9th and 12th, which brought widely scattered showers over the southern counties.

Upper air high pressure was back between the 13th and 19th, with very warm temperatures and little shower activity. This changed on the 20th when a cold front and upper air low crossed, tapping moisture from Eastern Pacific Hurricane Manuel. The result was torrential rainfall, with between six and nine inches falling along a Corsicana-Linden line. Rainfall amounts elsewhere in the area were generally greater than two inches.

Milder and dry air was present in the area between the 21st and 27th, with moisture returning on the afternoon of the 27th ahead of another storm system.

This system crossed on the 28th and 29th, with rainfall of between one and five inches in the area. The weak attendant cold front lowered temperatures slightly through the 30th.

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.

September 2013


September 2013, RECORDS AND SUMMARY:

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