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May 2016 - Report and Summary

The month of May 2016 saw near normal temperatures and below normal precipitation. The thirty-day outlook for May 2016 had called for near normal temperatures and above normal precipitation. It was not changed with the April 30 issuance. Compared with May 2015, the month was 1.1 deg. Cooler, and 8.82 inches drier. Year-to-date rainfall was 13.49 inches less through May 31, 2016 than the same period in 2015.

There were no major weather systems affecting East Texas during the first two weeks of May. A cold front on the 2nd brought showers that day and was followed by low humidities and comfortable nighttime temperatures through the 8th.

A crossing disturbance that day brought light showers, and was followed by upper air high pressure which warmed temperatures through the 13th. Another disturbance on the 14th brought more showers and was followed by another cool-down. The period between May 15 and 19 saw very cool temperatures and rain as a shallow cool air mass was overrun by moisture from the Gulf of Mexico. Rainfall amounts in the area were between 1.5 and 3.0 inches.

Upper air high pressure built in starting the 20th, and was the principal influence through the end of the month. Starting the 23rd, a series of upper air disturbances crossed in a southwest flow aloft. This brought scattered showers and thunderstorms which persisted through the end of the month. Activity was heaviest on the 26th and 27th when an upper air trough crossed. Rainfall amounts with this system were between 1.0 and 7.0 inches, with the heaviest rains over the southern counties. Temperatures were slightly above normal from the 20th through the end of the month.

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 2016



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