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July 2015 - Report and Summary

The month of July 2015 was much warmer than normal, and there was no rainfall. The thirty-day outlook had called for below normal temperatures and above normal precipitation. The June 30 revision changed this to below normal temperatures and near normal precipitation.

Compared with July 2014, the month was 5.1 deg. Warmer, and 5.25 inches drier.

July 2015 is the first month since October 1964 when no rain fell. It is the third July with no rainfall, the others being July 1924 and July 1947. Year-to-date rainfall remains awell above normal, and 12.79 inches above that through July 31, 2014.

The warm temperatures and absence of precipitation is explained by the persistent presence of strong upper air high pressure.

The upper air ridge brought seasonal temperatures early in the month which went above normal around the 10th. The ridge also resulted in dry conditions for most of the region. There was, however, an exception. A cold front reached Red River on the 6th, and held there for about three days. Heavy rain fell north of the IH-30 Corridor from the 6th through the 8th, with only isolated activity as far south as the IH-20 Corridor. The sea-breeze brought showers north to the US-79 Corridor on these days. Rain did not, however, fall in Tyler.

The ridge intensified beginning on the 16th, and kept the region hot and dry through the 31st. An increase in tropical moisture beginning on the 27th permitted widely scattered showers over the southeastern counties. A weak cold front entered the region on the 30th, with widely scattered showers region-wide followed by slightly lower temperatures.

Heat advisories were necessary on several days beginning with the 27th.

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 2015



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