The month of June 2009 was warmer and drier than normal. The month began cool, but upper air high pressure moved over the region around the 12th warming temperatures significantly. With a few minor day-to-day fluctuations, it continued until the 28th, when a weak cold front brought lower temperatures and scattered showers. Compared with 2008, the month was 0.1 deg. Warmer, and 3.78 inches drier. Year-to-date rainfall through month's end 10.41 inches less in 2009. The period since late-April had been dry, with precipitation only about one-third normal for the ten weeks. The thirty-day outlook had called for above normal temperatures and near normal precipitation.
The week May 31-June 6 saw temperatures about 5 degrees below normal, and rainfall about one-half normal. A dry air mass early in the week permitted mild nighttime low readings. The air mass moistened ahead of a storm system which crossed on the 3rd, bringing the week's rainfall. This was locally heavy north of IH-30, and over the southeast, but light to moderate along the IH-20 Corridor. A modified Polar Continental air mass built in behind the associated cold front, with upper air high pressure building back in at late-week and warming temperatures. The week's average temperature was 73.4 deg., and rainfall was 0.45 inch. This was 0.6 deg. Warmer than the previous week. Compared with the same week in 2008, the week was 10.5 deg. Cooler, and 0.43 inch wetter.
The week June 7-13 saw temperatures about a degree above normal, and rainfall about 125 percent of normal. A cold front went stationary over Southern Oklahoma on the 10th, and produced thunderstorm complexes which crossed the region during the next four nights. In Tyler, two thunderstorm clusters affected the city on the evening of the 10th and morning of the 11th. The evening activity was severe, causing two fatalities when a truck drove over a downed power line north of the city. Otherwise, upper air high pressure brought warm temperatures. The week's average temperature was 80.2 deg., which was 6.8 deg. Warmer than the previous week. Precipitation was 0.94 inch. Compared with the same week in 2008, the week was 1.7 deg. Cooler, and 0.61 inch wetter.
That ridge persisted throughout the week of the 14th-20th, resulting in temperatures about 5 degrees above normal and no rainfall. The we's average temperature was 84.5 deg., which was 4.3 deg. Warmer than the previous week. Compared with the same week in 2008, the week was 3.6 deg. Warmer, and 1.97 inches drier. Stubborn upper air high pressure was present in the area through the week of the 21-27, resulting in temperatures about 6 degrees warmer than normal, and no rainfall. There were a few isolated showers on the afternoon of the 24th as a weak wind shift line moved into the area. The week's average temperature was 86.9 deg., which was 2.4 deg. Warmer than the previous week. Compared with the same week in 2008, the week was 5.8 deg. Warmer, and 0.63 inch drier.
The month ended with a weak cold front dropping into the area on the afternoon of the 28th, and lowering temperatures on the 29th and 30th. Scattered thunderstorms on the 29th brought rainfall some heavy to about 30 percent of the area.
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.
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June 2009, RECORDS AND SUMMARY: