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June 2012 - Report and Summary

The month of June 2012 was warmer and drier than normal. It was, however, cooler and wetter than the hot June 2011. June 2012 was 4.2 deg. Cooler, and 2.09 inches wetter. Year-to-date rainfall was 8.61 inches greater in 2012 than in 2011 through month's end. Dry conditions were returning at month's end after a wet period from Winter through mid- Spring. The Summer pattern, which was established in late-May 2011, did not take hold until mid- June 2012. The thirty-day outlook had called for above normal temperatures and near normal precipitation.

June began mild, with temperatures warming between the 2nd and 5th under upper air high pressure. A slow-moving storm system crossed between the 6th and 8th, bringing widespread and highly varying rainfall amounts of up to four inches between the 6th and 8th. There were a few severe thunderstorms on the evening of the 6th. A closed upper air low was responsible.

Temperatures warmed again between the 9th and 11th, before another diffuse and weak storm system affected the region. This brought scattered thunderstorms, with severe weather on the evening of the 11th and morning of the 13th. Localized flooding accompanied the activity on the latter date. Localized heavy rains also occurred on the mornings of the 14th and 16th, with one to three inches on the former date and one to five inches on the latter. The presence of clouds and rain held temperatures to near normal values.

Dry weather on the 17th was due to upper air high pressure. On the 18th, a tropical wave began affecting the region with more afternoon and evening thunderstorm activity. This wave moved out of range on the 20th. At that point, upper air high pressure began ridging in from the west, resulting in rising temperatures and shutting off shower development.

Hot temperatures continued through the end of the month, with 100-plus temperatures common in the region between the 24th and 27th. A weakening of the upper air ridge permitted highs to fall back into the middle to upper 90s at month's end.

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.

June 2012



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