by Robert K. Peters, Ph.D. - National Weather Service Cooperating Observer
The month of February 2005 was warmer and wetter than normal. Compared with the same month in 2004, the month was 7.8 deg. warmer, and 0.34 inch drier. Year-to-date precipitation through the end of the month was 0.44 inch less in 2005 than through the same date in 2004. The Winter of 2004-2005 was warmer and drier than normal, and warmer and drier than the 2003-2004 Winter. Its average temperature was 51.7 deg., which is 2.0 deg. warmer than normal. The 2004-2005 Winter was 3.5 deg. warmer on average than the 2003-2004 Winter. Precipitation during the 2004-2005 Winter was 10.41 inches, which is 1.45 inches less than normal, and 87.8 percent of normal. Precipitation during the 2003-2004 Winter was 11.62 inches. The thirty-day outlook for February 2005 had called for near normal temperatures and above normal precipitation.
The week January 30-February 5 saw temperatures about 5 deg. cooler and rainfall about 140 percent of normal. A shallow layer of cold air was trapped near the surface for the first half of the week by a temperature inversion. This held temperatures within a narrow range. The inversion, which had begun on the morning of January 27, broke at mid-morning on the 3rd. It resulted in 170 hours of consecutive overcast conditions. Upper air disturbances crossed on the 30th and 1st, which brought the week's rains. A reinforcing cold front moved into the area on the 3rd as upper air high pressure built eastward. This broke the inversion. Temperatures began recovering on the 5th. The week's average temperature was 44.4 deg., and rainfall was 1.17 inches. This was 2.8 deg. colder than the previous week. Compared with the same week in 2004, the week was 2.0 deg. warmer, and 0.85 inch drier.
The week February 6-12 saw near normal temperatures and rainfall about 260 percent of normal. The week began mild and wet, with a strong upper air storm crossing on the 6th. This brought general and heavy rains to the area. A weak cold front followed on the 7th, which lowered temperatures slightly and brought the rain to an end. Another temperature inversion set up, with conditions overcast between the night of the 5th and late-afternoon of the 9th--87 consecutive hours. That inversion was broken by a stronger cold front on the 9th, which lowered readings to below normal levels on the 10th and 11th. Another upper air storm crossed on the 12th, bringing rain back to the area on that day. The average temperature was 50.6 deg., which was 6.2 deg. warmer than the previous week. Rainfall was 2.40 inches. Compared with the same week in 2004, the week was 10.4 deg. warmer, and 0.55 inch wetter.
The week February 13-19 saw temperatures about 7 deg. warmer than normal, and rainfall less than 5 percent of normal. The week began with a crossing storm, which brought the week's only rain. A dry air mass followed the storm, which resulted in strong afternoon warming between the 13th and 15th, with a record high temperature on the 15th. A cold front on the evening of the 15th lowered temperatures to near seasonal normals, where they remained for the rest of the week. The week's average temperature was 59.7 deg., which was 9.1 deg. warmer than the previous week. Rainfall was 0.02 inch. Compared with the same week in 2004, the week was 6.5 deg. warmer, and 0.03 inch drier.
The week February 20-26 saw temperatures about 5 deg. warmer than normal, and rainfall about 150 percent of normal. The weather pattern during the week was much the same as was the case with the previous week. It began with a weak storm system generating little rainfall on the 20th, and good afternoon warming under upper air high pressure. The air mass was moist instead of dry. The 86-degree maximum on the 21st was the highest in the 48 contiguous United States. A cold front and crossing storm system on the 23rd-24th brought significant rainfall and lowered temperatures slightly below normal. There were a few reports of severe weather on the morning of the 23rd, and the rainfall sent the Neches and Sabine Rivers out of their banks with minor lowland flooding. The week's average temperature was 60.1 deg., and rainfall was 1.50 inches. The week was 0.4 deg. warmer than the previous week. Compared with the same week in 2004, the week was 10.8 deg. warmer, and 0.30 inch wetter.
A storm system crossed on the 27th, bringing general but light rain to the area. This was followed by a cold front on the 28th, which cleared skies and brought a much drier air mass.
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
February 2005, RECORDS AND SUMMARY: