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April 2016 - Report and Summary

by Robert K. Peters, Ph.D. - National Weather Service Cooperating Observer

The month of April 2016 was warmer and wetter than normal. The thirty-day outlook had called for near normal temperatures and above normal precipitation. This was changed with the March 31 revision to above normal temperatures and near normal precipitation. Compared with April 2015, the month was 0.8 deg. Warmer and 0.58 inch drier. Year-to-date rainfall was 4.67 inches greater in 2015 than this year.

The month began with a weak storm system crossing on the 1st which resulted in light showers and was followed by colder temperatures behind the attendant cold front. Temperatures warmed rapidly between the afternoon of the 3rd and morning of the 6th, when another and much weaker disturbance and cold front crossed.

A significant change occurred in the North American pattern on the 7th. Strong upper air high pressure set up in the South, moving eastward to Eastern North America. This resulted in warming on the 7th and 8th, and then in a blocking ridge. Weak storm systems crossed between the 10th and 14th with rain and cooler temperatures. A slight warming followed on the 15th and 16th under weak upper air high pressure, which was followed by a strong and slow-moving storm system beginning on the 17th. This brought widespread rain to the area through the morning of the 21st, with between three and five inches observed.

Upper air high pressure returned between the 22nd and 26th. Two additional storm systems crossed with heavy rainfall through the end of the month one on the 27th and the second on the 29th. The latter system brought widespread severe weather to two corridors that evening: from Henderson through Van Zandt, Upshur and into Morris County. The second was from Houston into Cherokee Rusk, and Harrison County. More than six inches of rain fell in the second corridor, with more than nine inches in Harrison County.

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.

APRIL 2016



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