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June 2001 - Report and Summary

The month of June 2001 was cooler and wetter than normal. The remnants of Tropical Storm Allison plus a couple of stubborn upper air low pressure troughs over Central and Eastern north America were responsible for the damp and comparatively mild weather. June 2001 was 1.2 degrees cooler than June 2000, and 2.51 inches wetter. Year-to-date rainfall through June 30, 2001 was 5.01 inches greater than through the same date one year ago. Rainfall during the twelve months ending June 30, 2001 was 137.2 percent of normal. The thirty-day outlook for June 2001 had called for near normal temperatures and below normal precipitation.

The week May 27-June 2 saw temperatures two degrees warmer than normal, and rainfall about 300 percent of normal. Two storms crossed during the week--one on the 27th and a second on the 31st. Both produced widespread rainfall. The rain with the second storm was particularly heavy over the central counties, and there were a few occurrences of severe weather early on the morning of the 31st. Otherwise, upper air high pressure kept temperatures warm and a southerly surface flow kept conditions humid.

The week June 3-9 saw temperatures near normal and rainfall about 300 percent of normal. Tropical Storm Allison was the week's principal weathermaker in East Texas. The storm formed off Galveston on the 5th, came onshore early the following morning, and meandered over East Texas through the 9th. It brought torrential rains to parts of the region, with amounts of ten inches or more in the Lufkin-Nacogdoches area. Farther to the north, amounts along the IH-20 Corridor were from two and one-half to nearly five inches. There were incidents of flood damage in the area, with a bridge washed out on FM-14 just north of Tyler. Rain fell in Tyler daily between the 5th and 9th. The presence of clouds and rain held daytime temperatures down and nighttime temperatures up.

The week June 10-16 saw temperatures two degrees warmer than normal, and rainfall 125 percent of normal. The remnant of Allison departed on the 10th. A migratory storm and cold front crossed on the 14th/15th. This brought severe weather to the northern and western counties on the evening of the 14th. A Tropical Maritime air mass, present in the area prior to the arrival of the front of the 14th, held temperatures up. It was replaced by a Polar Maritime air mass on the 15th. This lowered temperatures and humidities.

The week June 17-23 saw temperatures one degree below normal and rainfall about one-sixth of normal. During the first part of the week, modified Polar air remained over the region. This dry air mass brought mild nighttime and seasonably warm daytime temperatures. At mid-week, Tropical air returned, raising nighttime temperatures and humidity. On the 21st, another storm system and cold front. crossed. This brought the week's only rain, and lowered temperatures with a cool and dry air mass.

The week June 24-30 saw temperatures three degrees cooler than normal and rainfall 175 percent of normal. At the beginning of the week, a modified Polar air mass was over the area. By mid-week, a closed-off upper air low had stationed itself over Southern Missouri. This brought the week's rainfall. The combination of clouds and rain held down daytime high temperatures, thought nighttime low readings were near normal. Flash flooding and severe weather accompanied the storm. On the 27th, the most intense weather was over the southern counties, while on the 28th, 29th, and 30th, intense weather was over the northern counties.

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.

June 2001



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