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August 2011 - Report and Summary

by Robert K. Peters, Ph.D. - National Weather Service Cooperating Observer

The very hot Summer of 2011 persisted through August, with numerous heat records set. Among these were:

The combination of a strong and stubborn upper air high pressure ridge with the very dry soils and vegetation was responsible for the oppressive heat. Compared with August 2010 which was also a very warm month August 2011 was 4.3 deg. Warmer, and 0.24 inch drier.

Year-to-date rainfall through August 31 was 12.69 inches greater in 2010 than in 2011. The thirty-day outlook for August 2011 had called for above normal temperatures and below normal precipitation.

Upper air high pressure dominated the weather for just about the entire month. It was centered over the area through the 5th, when a slow westward migration began. There was an eastward re-building between the 8th and 10th, followed by another westward retrogression. The result was hot temperatures, with numerous records set between the 2nd and 7th.

With northwesterly winds aloft, scattered showers moved into the northern counties on the afternoon of the 11th.

Eastward re-building commenced on the 12th, holding through the 20th. This again resulted in numerous temperature records from the very hot temperatures. The 108-degree high on the 19th is the highest temperature in Tyler since July 25, 1954.

The ridge shifted back westward beginning with the afternoon of the 19th. This permitted isolated late-day showers for the next several afternoons, with temperatures lowering slightly on the 21st.

For the remainder of the month, the ridge was centered west of the region on most days. This did two things: first, there were disturbances in the northwest flow aloft which brought isolated showers on a few afternoons; and second, the surface air mass was quite dry, permitting daytime highs to go back well above the century mark on most afternoons.

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.

AUGUST 2011

MX MN OBS PCPN REMARKS

AUGUST 2011, RECORDS AND SUMMARY:

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