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August 2012 - Report and Summary

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

August 2012 was slightly warmer and slightly wetter than normal. It was in sharp contrast with August 2011 the warmest month on record. August 2012 was 7.3 deg. Cooler, and rainfall was two inches greater.

The trend for near normal rainfall continued through the end of the month again in sharp contrast to the period through August 2011. Year-to-date rainfall through month's end was 12.5 inches greater in 2012 than in 2011.

The thirty-day outlook had called for above normal temperatures and near normal precipitation.

The month was hot and dry through the 17th, with temperatures running about four degrees above normal and the mercury reaching the century mark on six of the days. A weak system crossed on the 8th-9th with showers and a few thunderstorms.

On the 9th, the upper air high shifted westward. Disturbances in that flow brought showers near the area during the following week especially on the morning of the 15th when up to five inches of rain fell in the Dallas-Fort Worth area. Here, though, dry weather continued. Then came a change. The upper air high pressure ridge had begun shifting westward around the 13th. A northwest flow established itself down the Plains.

A series of disturbances and a weak cold front brought widespread rains and some strong thunderstorms from the morning of the 17th through the evening of the 18th. Between one and four inches of rain fell over East Texas.

Below normal temperatures began on the 17th. The 19th and 20th were dry and comfortable.

Another disturbance crossed on the 21st with widely scattered showers over the western counties. Temperatures warmed again beginning on the 24th, with a weak disturbance bringing more showers on the 27th. Hurricane Isaac, which came ashore over South Louisiana on the 29th, crossed to the east of the region. It brought rather gusty winds for several hours on the 30th, with a few light showers.

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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