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January 2015 - Report and Summary

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

The month of January 2015 was cooler and wetter than normal.

The thirty-day outlook had called for below normal temperatures and above normal precipitation. When revised on December 31, the outlook called for near normal temperatures and above normal precipitation. Compared with January 2014, the month was 0.5 deg. Cooler, and 4.84 inches drier.

The first half of January was cold and wet. Rainfall was about 50 percent above normal, and temperatures averaged about 7 degrees below normal. In contrast, the last half of the month saw near to above normal temperatures and slightly above normal precipitation.

The area was under Arctic air for just about the entire first 16 days of the month, except for a short break around the 5th. For most of this time, southwesterly winds just above the surface created a temperature inversion, trapping the cold air near the ground and providing an overcast which held down daytime temperatures. There was sun on the afternoons of the 4th, 5th, and 8th.

Otherwise, skies were overcast just about continually through the morning of the 15th, with the overcast conditions going back to December 27.

This pattern finally broke on the 16th, with a few days of dry weather and above normal temperatures.

This came to an end on the 21st. A cold front moved through the region, followed by an upper air storm on the 22nd and 23rd. This system brought between one and three inches of rain to the region, and lowered temperatures below normal between the 22nd and 24th.

Upper air high pressure built back into the region beginning the afternoon of the 23rd. This sent temperatures above normal on the 25th. The mild weather persisted until a cold front arrived on the 29th, again taking temperatures back to normal levels.

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.

January 2015



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