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September 2012 - Report and Summary

The month of September 2012 saw slightly above normal temperatures and nearly double normal rainfall. Compared with September 2011, the month was 2.4 degrees cooler and 5.09 inches wetter. Year-to-date rainfall through September's end was slightly more than double what it had been through September 30, 2011: 35.02 inches as compared with 17.38 inches. The thirty-day outlook had called for above normal temperatures and above normal precipitation.

The below normal temperatures of late-August gave way to hot weather during the first week of September as upper air high pressure rebuilt over the area from the west. This ridge retreated westward on the 8th, bringing a northwest flow aloft and permitting cold fronts into the region. This sent temperatures back to near to below normal values. A slow-moving upper air storm system crossed between the 13th and 16th. It brought widespread rains of between one and four inches to the region. As the low went east of the region, the northwest flow returned bringing more fronts and dry air.

Temperatures were mild until upper air high pressure returned on the 22nd. This brought warm temperatures. Moisture began increasing on the 25th ahead of a wet storm system which crossed on the 29th and 30th. This system, the remnant of Eastern Pacific Hurricane Miriam, brought more than five inches of rain south of a Palestine-Henderson-Carthage line, and around eleven inches in parts of Houston and Nacogdoches Counties.

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.

September 2012


September 2012, RECORDS AND SUMMARY:

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