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November 2017 - Report and Summary

The month of November 2017 was much warmer and much drier than normal. The thirty-day outlook, issued on October 19, called for near normal temperatures and near normal precipitation. It was not changed with the October 31 issuance. Compared with November 2016, the month was 0.6 deg. Cooler, and 1.08 inches drier. Year-to-date rainfall was 10.56 inches greater in 2017 than in 2016 through month's end. This was due largely to the record wet August.

Autumn 2017 was also very warm, with the temperature averaging 2.8 deg. Warmer than normal but 2.1 deg cooler than Autumn 2016 the third warmest Autumn on record. Autumn 2017 was dry, with precipitation of 4.09 inches, which was 8.25 inches less than normal, and 33.1 percent of normal. The season was 1.51 inches drier than Autumn 2016.

An upper air disturbance crossed on the morning of the 1st, interacting with a warm front. The result was widespread rain in the area, with coverage near 100 percent. Amounts were between one-fourth and two inches, increasing from north to south. The heaviest reported was 2.83 inches at Trinity.

Upper air high pressure controlled the region's weather through the evening of the 6th. This brought well-above normal temperatures and kept conditions dry. A cold front that evening combined with an upper air disturbance and overrunning moisture to bring widespread rain on the 7th, with amounts of one-half inch to an inch and a half. Amounts increased from east to west, with the heaviest rainfall report of 1.63 inches from Maypearl.

A Polar Maritime air mass lowered temperatures to near or slightly below normal levels between the 7th and 11th, with mostly dry conditions beginning on the 9th. Upper air high pressure returned along with Tropical Maritime air on the 12th, bringing above normal temperatures which continued through the 17th. Weak cold fronts on the 13th and 15th had little effect on temperatures, but did bring short-lived wind shifts into the north. Both fronts were accompanied by patchy light rain with minimal coverage and negligible amounts.

A stronger cold front arrived on the 18th, bringing isolated patches of light rain, and taking temperatures to near to slightly below normal levels through the 24th. Upper air high pressure sent temperatures back above normal through the end of the month, with weak cold fronts doing little more than bringing brief cool-downs and wind shifts.

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.

November 2017



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