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July 2011 - Report and Summary

July 2011 was the second warmest July on record, eclipsed only by July 1998; it was also the second warmest month on record. Rainfall was about 45 percent of normal, continuing the drought which commenced in July 2010.

Records for Tyler date to 1896.

Compared with July 2010, the month was 4.9 deg. Warmer, and 2.44 inches drier.

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

For most of the month, a stubborn upper air high pressure ridge was firmly in control. This, combined with the drought and dry soils and vegetation, resulted in high temperatures. The mercury reached or exceeded 100 degrees on each of the nine days between the 7th and 15th, Slight weaknesses in the ridge on the 6th brought showers. The ridge shifted northeast of the region on the 14th, permitting afternoon showers to be widely scattered through the 19th.

The ridge returned on the 20th, remaining through month's end. There were isolated showers when weaknesses developed between the 26th and 29th.

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.

July 2011



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