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July 2013 - Report and Summary

The month of July 2013 saw near normal temperatures and rmuch above normal precipitation. Compared with July 2013, the month was 1.8 deg. Cooler, and 2.02 inches wetter. Year-to-date rainfall was 1.29 inches less in 2013 than for the same period in 2012. The thirty-day outlook had called for near normal temperatures and near normal precipitation. When revised at the end of June, it called for below normal temperatures and near normal precipitation.

The month began mild, with record lows at some stations on the 2nd and 3rd. An unseasonably cool air mass entered the region due to northerly flow aloft down the Plains. Temperatures returned to near normal values between the 5th and 7th. Active sea-breeze fronts on the 7th and 8th brought widely scattered showers. Temperatures went above normal on the 9th, and stayed there until a highly unusual weather scenario set up on the 13th. An upper air low crossed the Southern Plains from east to west. This brought widespread rain and thunderstorms from the afternoon of the 14th through the evening of the 16th, along with record low maximum temperatures on the 14th and 15th. Rainfall amounts of between two and four inches were common in the area.

Upper air high pressure built back briefly on the 17th and 18th, then a tropical low moved westward through the Gulf of Mexico, bringing showers and thunderstorms between the 19th and 21st with the most concentrated and heaviest activity on the 19th.

Another weak cold front moved into the area on the 25th. This reversed the warming trend which had begun on the 22nd for a few days. The warm up resumed on the 29th as upper air high pressure returned to the region. A few light showers occurred on the mornings of both the 30th and 31st as thunderstorm complexes, dropping southeastward in the northwest flow aloft around the eastern fringe of the ridge, dissipated in the region.

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 2013



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