The month of September was much warmer and wetter than normal.
Tyler weather continued to re-write the record book during the month of September, though last month was not quite the warmest September on record. 1998 showed a total of 46 days at or above 100 degrees--thanks to the September contributions. This makes 1998 the year with the second greatest number, exceeded only by the summer of 1954 in which 51 were observed. The warmest September ever was 1911 when the temperature averaged 83.6 degrees. Behind that are 1939 with 83.4, 1921 with 83.1, 1900 with 82.9, and equalling 1998 in fifth place was 1910 with 81.9
The rainfall for the month fell with a tropical storm late in the second week and early in the third week. Otherwise, upper air high pressure was in firm control. September 1998 was 2.0 degrees warmer than September 1997, and 3.60 inches wetter. Year-to-date rainfall through the end of September 1998 was 7.22 inches less than for the same time last year. Twelve-month rainfall is very near normal at 45.39 inches. The last two months have seen above normal rainfall in Tyler.
The thirty-day outlook for September had called for near normal temperatures and near normal precipitation.
The first week in September saw temperatures eight degrees above normal and no rainfall. Record high temperatures were set on the 4th as the upper air high pressure ridge was at its most intense. The upper air high largely suppressed shower activity, though a rather active sea-breeze front on the 6th spread widely scattered showers as far north as Tyler.
The second week in September saw temperatures and two degrees below normal, and rainfall about 300 percent of normal. Tropical Storm Frances was the main weather news of the week. Coming onshore near Aransas Pass on the morning of the 11th, she and her remnants brought widespread rainfall to East Texas from the 11th.
On the 11th and 15th, rain was virtually continuous. This brought substantial relief to the drought of the past six months, with counties rescinding burning bans on the 14th. Skies were overcast after the 10th, and temperatures held within a narrow diurnal range.
The third week in September saw temperatures three degrees above normal and rainfall 300 percent of normal. Rains continued from the tropical feature early in the week, with high pressure aloft returning late in the week.
The final week in September was nine degrees warmer than normal and there was no rainfall. The upper air high pressure ridge continued in place, and was the controlling feature in the area's weather.
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
September 1998, RECORDS AND SUMMARY: