The month of March 2010, continuing the trend throughout the 2009-2010 cool season, was much cooler and slightly wetter than normal. This season will likely emerge as a textbook example of an El Nino Winter, with cold temperatures, three occurrences of measurable snowfall, and precipitation running somewhat above normal. Compared with March 2009, the month was 3.3 deg. Cooler, and 3.29 inches drier. Year-to-date rainfall through the 31st was identical for both years. The thirty-day outlook had called for below normal temperatures and above normal precipitation.
The week February 28-March 6 saw temperatures about 9 degrees cooler than normal, and rainfall about two-thirds normal. A storm system and cold front crossed on the 1st, bringing the week's rainfall. Cool air persisted, until a warming trend set in on the 4th. The week's average temperature was 48.4 deg., and precipitation was 0.64 inch. This was 4.9 deg. Warmer than the previous week. Compared with the same week in 2009, the week was 9.6 deg. Cooler, and there was no precipitation in the previous year.
The week March 7-13 saw near normal temperatures and rainfall about 150 percent of normal. A slow-moving and wet storm system crossed between the 8th and 10th, with severe weather on the afternoon of the 10th. Tropical Maritime air was in the region during this time. A cold front, crossing on the 11th, sent temperatures back below normal. Readings had been above normal while the storm system was over the region. The week's average temperature was 58.1 deg., which was 9.7 deg. Warmer than the previous week. Rainfall was 1.48 inches. Compared with the same week in 2009, the week was 2.2 deg. Warmer, and 3.97 inches drier.
The week March 14-20 saw temperatures about 7 degrees below normal, and rainfall about 75 percent of normal. A weak cold front crossed on the 16th with no associated weather. It did keep temperatures below normal until a strong front and storm system arrived on the 20th. This brought widespread rain on the 20th, and snow on the 21st. Snowfall amounts were around two inches north of Tyler, with one-half inch or less accumulating south of the IH-20 Corridor. The precipitation of the 20th and 21st was accompanied by strong northwest winds in the 15-25 mph range, which lower wind chill equivalent values into the 20s for much of the weekend. The week's average temperature was 53.7 deg., and precipitation was 0.73 inch. The week was 4.4 deg. Cooler than the previous week. Compared with the same week in 2009, the week was 6.0 deg. Cooler, and 0.71 inch wetter.
The week March 21-28 saw temperatures about 9 deg. Below normal, and precipitation about 150 percent of normal. Rapid warming followed the winter storm of the 20th-21st, until a cold front arrived on the 25th with widespread rain and a few thunderstorms. Temperatures lowered for a couple of days, with strong warming again on the 27th ahead of another cold front. This one crossed dry, with windy conditions on the 27th and 28th. The week's average temperature was 53.1 deg., which was 0.6 deg. Cooler than the previous week. Precipitation was 1.52 inches. Compared with the same week in 2009, the week was 5.4 deg. Cooler, and 0.10 inch drier.
The final four days of the month saw a strong warming trend, with the first 80-degree high observed on the 30th. There were 151 days in the cool season without a high of 80; the latest in 2009 was on October 29. Surface and upper air high pressure brought the warm-up.
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
March 2010, RECORDS AND SUMMARY: