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August 2016 - Report and Summary

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

The month of August 2016 was warmer and wetter than normal. The thirty-day outlook had called for above normal temperatures and near normal precipitation. When revised on July 31, it called for near normal temperatures and below normal precipitation. Compared with August 2015, the month was 0.3 deg. Cooler and 1.16 inches wetter. Year-to-date rainfall through August 31 was 12.46 inches less in 2016 than in 2015.

The period from August 1-12 was hot, and mostly dry. Tyler reached or exceeded the century mark on eleven consecutive days between the 2nd and 12th. Heat advisories were required daily between the 3rd and 12th. Temperatures during this period averaged about five degrees above normal. There were afternoon showers daily beginning on the 7th because of a slight weakness and re-positioning of the upper air high pressure ridge. Only on the 7th did areal coverage approach 50 percent. On other days, coverage was 20 percent or less.

An abrupt change in the weather occurred on the 13th. A TUTT (tropical upper tropospheric trough) brought torrential rains to the IH-10 Corridor in Louisiana between the 11th and 14th, bringing between fifteen and twenty-seven inches of rain to that region. It moved northward through Western Louisiana, spreading clouds and rain into East Texas beginning on the 12th. This lowered temperatures and brought widespread rain to the area beginning on the 13th.

Record low maximum temperatures occurred on the 15th, 16th, and 17th. The low merged with an upper air trough extending northeastward out of Central Texas on the morning of the 15th. The trough remained in that position for several days and combined with very high moisture values to generate showers daily. On the 19th, a second trough and a weak cold front entered the area. This continued rain and lower temperatures through the 22nd. Upper air high pressure returned between the 23rd and 26th, when another slow-moving (TUTT) tropical low returned showers and slightly lower temperatures to the area. The low was moving westward along the Gulf Coast, and did not go out of range until the 31st.

Weak upper air high pressure built back in on the 31st, though there were a few isolated morning showers that day because of the continued presence of the tropical low off the Lower Texas Coast.

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.




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