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May 2013 - Report and Summary

The month of May 2013 saw normal temperatures and slightly above normal rainfall. Compared with May 2012, the month was 3.2 deg. Cooler, and 1.81 inches wetter. Year-to-date rainfall through month's end was 2.72 inches greater in 2012 than in 2013. The thirty-day outlook had called for near normal temperatures and near normal precipitation. It was not changed at the end of April.

An unseasonably strong late-season cold front passed through the area on the 2nd, with a reinforcing shot of cold air on the 4th. This brought record low temperatures to stations in the area between the 3rd and 6th. Following that, temperatures returned to near normal values. Temperatures remained at or slightly above normal for the remainder of the month. A storm system on the 9th brought showers to the area. A stronger one crossed between the 15th and 17th, with rain and thunderstorms, and widespread severe weather in Central Texas on the night of the 15th.

Another strong system crossed on the 21st the same system responsible for the Oklahoma City EF-5 tornado. This brought widespread severe weather on the evening of the 21st, and rains of between one and three inches to the area.

Additional scattered thunderstorms occurred between the 24th and 26th. Rainfall was less widespread, and there were reports of small hail on the night of the 24th.

Warm, humid, and breezy conditions set up on the 27th, and continued through the end of the month. The approach of yet another upper air trough brought widely scattered afternoon and early-evening thunderstorms between the 29th and 31st.

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 2013



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