The month of July 2010 saw near normal temperatures and above normal rainfall. Compared with the same month in 2009, the month saw an identical average temperature, and 3.31 inches less of precipitation. Year-to-date rainfall was 3.52 inches greater in 2010 than in 2009. The thirty-day outlook had called for below normal temperatures and near normal precipitation.
The week June 27-July 3 saw temperatures about a degree below normal, and rainfall about 350 percent of normal. Early in the week, upper air high pressure brought warm and dry weather. From mid-week through the Independence Day weekend, moisture from Hurricane Alex, who came ashore in North Mexico on the 1st, brought widespread rainfall daily between the 29th and 3rd. Clouds and rain lowered daytime temperatures below normal. The week's average temperature was 81.0, and rainfall was 3.13 inches. This was 3.6 deg. Cooler than the previous week. Compared with the same week in 2009, the week was 5.0 deg. Cooler, and there was no rain in that week.
The week July 4-10 saw near normal temperatures and rainfall about one-half normal. A Tropical Maritime air mass was over the area for the entire week. A slow-moving tropical wave, which eventually became Tropical Depression 2, caused afternoon showers from the 7th through the 10th. Clouds and showers held down daytime highs, but the high relative humidity kept nighttime readings a few degrees above normal. The week's average temperature was 82.9, which was 1.9 deg. Warmer than the previous week. Rainfall was 0.29 inch. Compared with the same week in 2009, the week was 1.6 deg. Cooler, and 1.10 inches drier.
The week July 11-17 saw temperatures about 2 deg. Above normal, and rainfall about 5 percent of normal. A warm and humid Tropical Maritime air mass was present for the entire week, along with upper air high pressure. The result was very warm nighttime temperatures, and daytime readings below normal early in the week rising to slightly above normal by week's end. Weaknesses in the ridge on the 11th and 12th, and again on the 17th brought scattered showers and thunderstorms. The first weakness was due to remnant energy from Tropical Depression 2. The week's average temperature was 84.9 deg., which was 2.0 deg. Warmer than the previous week. Rainfall was 0.03 inch. Compared with the same week in 2009, the week was 1.0 deg. Cooler, and 0.21 inch drier.
The week July 18-24 saw near normal temperatures, and rainfall about one-third normal. A weak mid-level tropical low pressure area early in the week brought scattered showers on the 19th and 20th. Upper air high pressure followed that system, largely suppressing shower development and sending temperatures back slightly above normal after below normal readings early in the week. The week's average temperature was 84.6, and rainfall was 0.15 inch. This was 0.3 deg. Cooler than the previous week. Compared with the same week in 2009, the week was 3.7 deg. Warmer, and 1.92 inches drier.
The week July 25-31 saw near normal temperatures and precipitation about 200 percent of normal. A TUTT (tropical upper tropospheric) low pressure slowly crossed the region between the 26th and 28th. This caused afternoon showers on each of those days, which lowered temperatures. By week's end the low had dissipated, and upper air high pressure returned with warming temperatures and continuing high relative humidities. The week's average temperature was 83.4 deg., which was 1.2 cooler than the previous week. Rainfall was 1.12 inches. Compared with the same week in 2009, the week was 2.9 deg. Warmer, and 3.66 inches drier.
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
July 2010, RECORDS AND SUMMARY: