The month of October 2007 was warmer and drier than normal. Starting out with above normal temperatures, an abrupt turn to cool readings came on the 22nd. Persistent upper air high pressure to the west and south of the region kept moisture from the Gulf of Mexico largely closed off to the area, and limited rainfall. Compared with October 2006, the month was 1.6 degrees warmer, and 2.71 inches drier. Year-to-date rainfall through the end of the month was 23.83 inches more in 2007 than in 2006. However, October 2007 continued a trend, beginning in mid-July, of much below normal rainfall. The thirty-day outlook for October 2007 had called for near normal temperatures and above normal precipitation.
The week September 30-October 6 saw temperatures about 8 degrees above normal, and no measurable rainfall. Except for a weak cold front on the 2nd, the area was under upper air high pressure with Tropical Maritime air in control. The week's average temperature was 79.5 deg., which was 0.3 deg. Warmer than the previous week. Compared with the same week in 2006, the week was 2.0 deg. Warmer, and there was no rain in 2006.
The week October 7-13 saw temperatures about 6 degrees above normal, and no rainfall. A cold front crossed on the 9th, and replaced the Tropical Maritime air with Polar Maritime air. This lowered temperatures closer to seasonal normals for the last half of the week. There were a few scattered showers with the front. The week's average temperature was 74.5 deg., which was 5.0 deg. Cooler than the previous week. Compared with the same week in 2006, the week was 8.6 deg. Warmer, and 1.35 inches drier.
The week October 14-20 saw temperatures about 3 degrees above normal, and rainfall about 50 percent of normal. A crossing disturbance on the 15th brought the week's rain, with amounts of nearly 6 inches over the northern counties. Otherwise, a mild air mass was replaced on the 17th by a Tropical Maritime air mass, which was replaced on the 18th by a Polar Maritime air mass. The mild temperatures of early in the week were replaced by very warm readings at mid- week, and a cooling trend late in the week. The week's average temperature was 69.9 deg., which was 4.6 deg. Cooler than the previous week. Rainfall was 0.54 inch. Compared with the same week in 2006, the week was 3.2 deg. Warmer, and 0.80 inch drier.
The week October 21-27 saw temperatures about 5 degrees cooler than normal, and rainfall about one-half normal. A dramatic change occurred early in the week, and persisted through the end of the month. A strong cold front crossed on the 22nd, bringing widespread showers and thunderstorms, and introducing cool and dry weather as several reinforcing shots of cool air reached the region. Surface and upper air high pressure were in control, and there was no rain. The week's average temperature was 58.8 deg., which was 11.1 deg. Cooler than the previous week. Precipitation was 0.65 inch. Compared with the same week in 2006, the week was 0.9 inch cooler, and 0.56 inch drier.
The final four days in the month saw a slight warming trend ahead of a front crossing on the night of the 31st. With dry air and upper air high pressure, there were very few clouds and no rain.
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
October 2007, RECORDS AND SUMMARY: