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May 2011 - Report and Summary

The month of May 2011 saw near normal temperatures and below normal precipitation. May 2011 was 4.0 deg. cooler than May 2010, and 1.04 inches wetter. Year-to-date rainfall through month's end was 0.31 inch greater in 2011 than in 2010.

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

A diffuse storm system crossed between the evening of the 1st and the 3rd, resulting in rainfall and very cool temperatures. Temperatures went above normal on the 6th, remaining there until another system crossed on the night of the 12th. This brought substantial rainfall to the counties along Red River, and those from Angelina eastward to the Louisiana border, along with severe weather on the nights of the 11th and 12th.

Very cool air settled over the region on the 13th, with below normal temperatures continuing through the 17th. Temperatures warmed on the 18th ahead of an upper air low which began crossing on the 20th. Strong storm systems crossed on the 20th-21st, and again on the 24th-25th. Thunderstorms were widespread in the area on both occasions. The first system resulted in the Joplin, Mo. Tornado on the 21st.

Temperatures continued warm and conditions humid until a cold front reached the area on the evening of the 25th. This brought a respite from high temperatures until warming resumed on the 27th.

Temperatures climbed to well above normal levels between the 27th and 31st, with no precipitation. This happened as upper air high pressure established itself over the region, and a summertime pattern commenced.

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.

May 2011



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