by Robert K. Peters, Ph.D. - National Weather Service Cooperating Observer
The month of August 2015 was slightly warmer than normal and received near normal precipitation. The thirty-day outlook had called for above normal temperatures and below normal precipitation. This was not changed when the outlook was revised on July 31. Early- and mid-August were very warm and dry. Upper air high pressure controlled the region's weather for most of this time.
It was at its strongest through the 12th. Beginning then, the ridge shifted westward, and its influence weakened. This resulted in slightly lower thought still near to slightly above normal--temperatures, and scattered showers from the 11th through the 19th. Weak surface boundaries moved through the region on the 11thh and 15th. The weak front on the 11th produced an occurrence of severe weather over southern Smith County on that afternoon.
The temperature reached or exceeded 100 on seven consecutive days between the 5th and 11th. High humidities from the 5th through the 12th sent heat index values above 100, with heat advisories required on several days. A stronger cold front and accompanying upper air low crossed on the 19th. This brought widespread thunderstorms and much cooler temperatures for a couple of days. The 72-degree high temperature on the 20th was the second coolest August high temperature on record: cooler were the 71-degree maxima recorded on "August 8, 1997, and August 31, 1950.
Upper air high pressure returned for a few days. Another cold front arrived on the 25th, with widespread rain and thunderstorms on that morning. A severe thunderstorm moved southeastward from northwestern Smith into southwestern Rusk County that morning, resulting in power failures and heavy rainfall of up to an inch and a half.
The cold front brought mild nighttime temperatures through the morning of the 28th, and held down afternoon humidities. Another weak front on the 29th brought isolated showers on both the 29th and 30th, but temperatures returned to normal through the end of the month. Compared with August 2014, the month was 1.3 deg. Warmer, and 2.18 inches wetter.
Year-to-date rainfall was 14.97 inches greater through August 31, 2015 than for the same period last year. This was due to the extremely wet Spring season.
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.
MX MN OBS PCPN REMARKS
AUGUST 2015, RECORDS AND SUMMARY: