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July 2012 - Report and Summary

The month of July 2012 was warmer than normal, but saw near normal precipitation. ompared with July 2011, the month was 4.8 deg. Cooler, and 1.98 inches wetter. July 2011, in the midst of the 2011 heat wave, was the warmest July on record. Year-to-date rainfall was 10.59 inches greater in 2012 than in 2011 through month's end, and was near normal. A series of upper air storm systems kept temperatures relatively mild during the first half of the month with ample rainfall. The latter half of the month was dominated by upper air high pressure, with hot temperatures and little rainfall. The thirty-day outlook had called for above normal temperatures and below normal precipitation.

A storm system exited on the 1st, followed by building high pressure. This caused temperatures to go slightly above normal through the 7th, and virtually suppressed any rainfall. On the 8th, a slow-moving upper air system, reinforced a couple of times, took up a position over the Southern United States. This brought below normal temperatures and frequent mainly afternoon and evening showers and thunderstorms until it finally moved westward out of range on the 16th.

Temperatures warmed again between the 17th and 21stt as upper air high pressure returned. Another Easterly wave crossed between the 21st and 23rd, returning afternoon showers and thunderstorms to the region, with severe weather on the afternoon of the 21st.

Upper air high pressure built back in on the 24th with warming and an end to showers. A weak cold front brought thunderstorms to the northeastern counties on the morning of the 27th, and a slight weakening of the upper air high. It re-built on the 28th, with hot temperatures and dry conditions through month's end. The temperature reached or exceeded 100 deg. On each of the month's last four days.

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 2012



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