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June 2002 - Report and Summary

The month of June 2002 was cooler and wetter than normal. The June 2002 average temperature was the same as that for June 2001. Rainfall last month was 3.27 inches less than that in June 2001. Year-to-date rainfall through June 30 was 14.13 inches less in 2002 than in 2001. Rainfall over the past twelve months is 98.9 percent of normal. The 30-day outlook for June 2002 had called for above normal temperatures and near normal precipitation.

The week May 26-June 1 saw temperatures near normal, and precipitation about 250 percent of normal. The week began warm under an upper atmospheric high pressure ridge. At mid-week, a slow-moving closed upper air low crossed. This brought showers and thunderstorms from the evening of the 27th through the afternoon of the 30th. A few locations received heavy rainfall early on the mornings of the 28th, and again on the 29th. In Tyler, 2.18 inches of rain fell between 3 a.m. and 8 a.m. on the 29th. This caused high water, and electric power failures. At late-week, the low drifted into the Northwestern Gulf of Mexico, and upper air high pressure built back in from the west. This shut down shower activity, and raised temperatures. The week's average temperature was 76.2 deg., which was 7.3 deg. warmer than the previous week.

The week June 2-8 saw temperatures two degrees warmer than normal, and no rainfall. For the entire week, upper air high pressure was dominant. Temperatures were quite warm and conditions humid until a weak cold front arrived on the evening of the 5th. This lowered humidities and temperatures slightly. Moist air returned on the 8th. There were a few sprinkles with the returning warm front, and widely scattered afternoon showers from daytime heating on the 8th. The week's average temperature was 80.2 deg., which was 4.0 deg. warmer than the previous week.

The week June 9-15 saw temperatures about one degree above normal, and rainfall near normal. General rain occurred on the afternoon of the 9th with the passage of a weak cold front. Widely scattered showers occurred on the afternoon of the 12th. The front of the 9th made no dent in temperatures, though the front of the 12th/13th did lower both temperatures and humidities. Through the 13th, Tropical Maritime air was present over the region, with Polar Maritime air on the 14th and 15th. The week's average temperature was 80.0 deg., which was 0.2 deg. cooler than the previous week.

The week June 16-22 saw temperatures three degrees cooler than normal, and rainfall about one-third normal. The week began and ended with Modified Polar air masses over the region, with Tropical Maritime air during the mid-week period. Scattered to numerous afternoon showers and thunderstorms occurred on the afternoons of the 20th and 21st, though no rain fell in the city. A crossing upper air disturbance in the Easterlies was responsible for this precipitation. Rain fell early on the morning of the 16th in most of the region, when the City Office measured its only rainfall of the week. A cold frontal boundary was responsible for this. Atmospheric pollutants accumulated on the 21st and 22nd, with Tyler's air quality reaching an unhealthy level on the 22nd. The week's average temperature was 77.6 deg., which was 2.6 deg. cooler than the previous week.

The week June 23-29 was four degrees cooler than normal, and rainfall was 470 percent of normal. An upper air low entered the region on the 23rd, and moved first north and then south through the end of the week. At the same time, a very moist mass of Tropical Maritime air was present. The result was showers and thunderstorms, which brought rain to Tyler on six of the week's seven days. Strong winds accompanied thunderstorms on the afternoon of the 29th. The week's average temperature was 78.0 deg., which was 0.4 deg. warmer than the previous week. The last day of the month also saw scattered late-day thunderstorms.

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 2002



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