July 2010

Report and Summary

Tyler, Texas
July 2010
by Robert K. Peters, Ph.D.
National Weather Service Cooperating Observer

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.

• KEY TO SYMBOLS:
• A = HAIL
• B = BLOWING
• D = DUST
• F = FOG
• H = HAZE
• IP = SLEET
• K = SMOKE
• L = DRIZZLE
• R = RAIN
• S = SNOW
• T = THUNDERSTORM
• Z = GREENWICH MEAN TIME
• ZL = FREEZING DRIZZLE
• ZR = FREEZING RAIN
• - = LIGHT
• + = HEAVY

R FOLLOWING A TEMPERATURE OR PRECIPITATION VALUE = RECORD

The reporting period for temperatures, precipitation, 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. 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.

• DY MX MN OBS PCPN REMARKS
• 01 87 74 82 0.38 F, PCPN 0000-0200
• 02 84 72 74 1.06 F, PCPN 1500-1600, 2200-2400 MORNING LOW 74
• 03 86 73 77 0.38 F, T, PCPN 0000-0200, 2200-2300
• 04 90 74 88 F
• 05 91 76 85 F
• 06 92 75 79 0.06 PCPN 2200-2300
• 07 90 75 77 0.08 F, H, PCPN 2100-2200
• 08 91 75 87
• 09 93 75 90
• 10 89 74 76 0.15 F, T, PCPN 1800-1900, 2000-2100, MORNING LOW 76
• 11 93 73 90 0.03 F, PCPN 0000-0100
• 12 91 76 87
• 13 93 79 91
• 14 94 76 92
• 15 94 75 92
• 16 96 75 93
• 17 97 77 91 MORNING LOW 78
• 18 95 75 88
• 19 91 75 79 0.08 PCPN 2300-2400
• 20 93 75 89 0.07 PCPN 1800-1900, 2200-2300
• 21 95 74 92
• 22 95 75 91
• 23 95 76 92 F
• 24 95 75 90
• 25 97 76 94
• 26 94 73 75 0.08 T, F, PCPN 2200-2400 OVERNIGHT LOW 76
• 27 91 73 80 0.69 T, F, PCPN 2100-2200
• 28 87 72 74 0.32 T, F, PCPN 1500-1600, 2000-2400OVERNIGHT LOW 74
• 29 90 72 88 0.03 PCPN 0000-0100, 1200-1300
• 30 95 75 95
• 31 98 75 9531 98 75

JULY 2010, RECORDS AND SUMMARY:

• HIGHEST TEMPERATURE 98 ON THE 31ST,
• LOWEST TEMPERATURE 72 ON THE 2ND, 28TH, AND 29TH;
• AVERAGE MAXIMUM 92.3 F.,
• AVERAGE MINIMUM 74.7 F.,
• AVERAGE TEMPERATURE 83.5 F.,
• 0.1 DEG. WARMER THAN NORMAL.
• 0 HEATING DEGREE DAYS,
• 0 PERCENT OF NORMAL HEATING DEGREE DAYS.
• 581 COOLING DEGREE DAYS,
• 102.3 PERCENT OF NORMAL COOLING DEGREE-DAYS;
• TOTAL PRECIPITATION 3.41 IN.,
• 1.25 IN. GREATER THAN MONTHLY NORMAL.
• 158.9 PERCENT OF NORMAL MONTHLY PRECIPITATION.
• YEAR-TO-DATE PRECIPITATION 28.00 IN.,
• 3.00 IN. GREATER THAN NORMAL YEAR-TO-DATE PRECIPITATION,
• 112 PERCENT OF NORMAL YEAR-TO-DATE PRECIPITATION;
• 5 DAYS ON WHICH THUNDERSTORMS OCCURRED;
• 12 DAYS ON WHICH MEASURABLE PRECIPITATION OCCURRED;
• 12 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED TO BETWEEN ONE-HALF AND SEVEN MILES BY FOG, SMOKE, OR HAZE;
• 0 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED TO ONE-FOURTH MILE OR LESS
• BY FOG;
• 0 DAYS ON WHICH THE VISIBILITY WAS RESTRICTED BY DUST OR BLOWING DUST;
• 0 DAYS ON WHICH FROZEN PRECIPITATION WAS OBSERVED;
• 0 IN. TOTAL SNOWFALL.
• 26 DAYS ON WHICH THE MAXIMUM TEMPERATURE REACHED OR EXCEEDED 90DEG.;
• 0 DAYS ON WHICH THE MAXIMUM TEMPERATURE REACHED OR EXCEEDED 100 DEG.;
• 0 DAYS ON WHICH THE TEMPERATURE FAILED TO RISE ABOVE 32 DEG.
• 0 DAYS ON WHICH THE MINIMUM TEMPERATURE REACHED OR FELL BELOW 32 DEG.
• 0 SEASON-TO-DATE HEATING DEGREE DAYS,
• PERCENTAGE OF NORMAL SEASON-TO-DATE HEATING DEGREE DAYS: 0.0.
• 1598 YEAR-TO-DATE COOLING DEGREE DAYS.
• PERCENTAGE OF NORMAL YEAR-TO-DATE COOLING DEGREE DAYS: 111.8,
• PRECIPITATION DURING THE PREVIOUS TWELVE MONTHS 57.16 IN.,
• TWELVE-MONTH PRECIPITATION PERCENTAGE 126.3.

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