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October 2000 - Report and Summary

The month of October 2000 was somewhat warmer and slightly drier than normal. The rainfall deficit, which commenced in mid-June, came to an end in mid-October. In early October, an unseasonably cold outbreak llwered temperatures to well-below normal, and set several new records. Most of the month was, however, warmer than normal as persistent upper air high pressure held in place. October 2000 was 2.2 deg. warmer than October 1999, and 1.70 inches wetter. Year-to-date rainfall through October 31 was 36.74 inches. This compares with 37.35 inches at the same tine in 1999. Precipitation during the twelve months preceding October 31, 2000 is 41.09 inches. This is 90.8 percent of normal. The thirty-day outlook for October 2000 had called for above normal temperatures and near normal precipitation. The week October 1-7, 2000 saw temperatures one degree above normal and rainfall about one-fourth normal.

The week began with a very warm and moist Tropical Maritime air mass replacing a Polar Maritime air mass. On the 6th, a very strong cold front moved into the area, with Polar Continental air. This lowered temperatures sharply from well above normal levels. The front also brought the week's only rain, with help on the 7th from moisture provided by the remnants of Hurricane Keith. Keith went onshore in Mexico on the 5th.

The week October 8-14 saw temperatures eight degrees below normal, and rainfall about 15 percent of normal. An unseasonably early Polar Continental air mass held sway through the 10th. This brought temperatures which set or equalled records between the 7th and 10th. Overrunning moisture caused the week's only rainfall, observed on the 8th. Tropical Maritime air began a slow return on the 11th, s;lowly warming temperatures through week's end. The week October 15-21 saw temperatures two degrees above normal and rainfall about 200 percent of normal. A wet storm crossed early in the week, followed by weak mid- level high pressure at mid-week. Late in the week, another storm approached from the southwest. There were no major cold fronts during the week.

The week October 22-28 saw temperatures eight degrees warmer than normal, and rainfall about five percent of normal. The storm which crossed between the 20th and 23rd brought the only rainfall. In East Texas, amounts were light. Tropical Maritime air was in place for most of the week. This brought high humidities, which held nighttime temperatures in the 60s on most mornings. Considerable cloudiness held daytime readings in check somewhat, despite the presence of upper air high pressure. Two upper air storms crossed late in the week. These brought rain to the northern counties on the evening of the 26th, and again on the morning of the 28th. For the remainder of the region, the two storms brought only cloudiness.

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.

October 2000



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