July 2006

Report and Summary

Tyler, Texas
July 2006
by Robert K. Peters, Ph.D.
National Weather Service Cooperating Observer

The month of July 2006 saw near normal temperatures and above normal precipitation. Nonetheless, the drought continues. The rainfall deficit over the past nineteen months is 35.4 percent.

Upper air high pressure controlled the area's weather for much of the month with a couple of breaks.

The second and fourth weeks saw a dissipating cold front and tropical wave respectively. This lowered temperatures and brought rainfall. Precipitation was far from uniform. Stations over the east came in with as much as 400 percent of normal rainfall, while some stations in the central and west received less than 20 percent of normal. Compared with July 2005, the month was 0.7 deg. Warmer, and 0.28 inch drier. Year-to-date rainfall was 4.67 inches greater through July's end in 2006 than in 2005.

The thirty-day outlook for July 2006 had called for above normal temperatures and below normal precipitation.

The week June 25-July 1 saw temperatures about 2 degrees below normal, and no rainfall. A strong cold front for the time of year moved into the area on the afternoon of the 26th. This lowered nighttime temperatures into the 50s and 60s in the area between the 27th and 30th. Daytime high readings were held down a couple of days, and were comparatively pleasant later in the week because of the dry relative humidities.

On the 1st,a low pressure area formed over Central Texas. This brought scattered showers and thunderstorms to the southern half of the region on the afternoon of the 1st. The week's average temperature was 79.6 deg., which was 1.6 deg. Cooler than the previous week. Compared with the same week in 2005, the week was 5.2 deg. Cooler. In 2005, 0.55 inch of rain fell.

The week July 2-8 saw temperatures about 3 degrees below normal and rainfall about 275 percent of normal. An upper air storm lingered over the area for much of the week. This brought rain to the area between the 1st and 6th, with the heaviest occurring on the 5th.

The presence of clouds and showers held down temperatures. The week's average temperature was 79.7 deg., and rainfall was 2.05 inches. This was 0.1 deg. Warmer than the previous week Compared with the same week in 2005, the week was 4.5 deg. Cooler and 1.95 inches wetter.

The week July 9-15 was in sharp contrast, with above normal temperatures and no precipitation though there were a few isolated showers from the sea-breeze on the 12th and 13th to the south, and to the east on the 15th. Upper air high pressure re-established control on the 7th. As the week progressed, temperatures rose, with several stations reporting afternoon high temperatures at or above 100 deg. Beginning on the 12th.

The highest temperatures were at locations which received little or no rain the previous week. The week's average temperature was 86.3 deg., which was 6.6 deg. Warmer than the previous week. Compared with the same week in 2005, the week was 2.9 deg. Warmer and 0.97 inch drier.

The week July 16-22 saw temperatures about 4 degrees warmer than normal, and near normal rainfall. The week began very hot, with temperatures in the high 90s and low 100s throughout the region. The area was in the midst of a heat wave which covered much of the United States, and was caused by a strong upper air high pressure ridge. A minor disturbance penetrated the high at mid-week, bringing some showers. At the end of the week, the upper air high retreated westward, and a cold front entered the region, bringing significant rainfall to much of the area on the 22nd. The week's average temperature was 87.8, and rainfall was 0.70 inch. The week was 1.5 deg. Warmer than the previous week. Compared with the same week in 2005, the week was 4.9 deg. Warmer, and 0.84 inch drier.

The week July 23-29 saw temperatures about 1 degree below normal, and rainfall about 25 percent of normal. The upper air high continued shifting west early in the week. A tropical low came ashore in South Texas on the 24th, and moved slowly northeastward over the next four days. Torrential rains of as much as 8 inches occurred along the Louisiana border counties on the 25th, 26th, and 27th. Farther to the west, little or no rain fell. The presence of clouds and rain held down temperatures. On the 28th, the upper air high began building back into the region from the southeast, raising temperatures. There were isolated sea-breeze showers on each of those afternoons within about 125 miles of the Gulf Coast. The week's average temperature was 82.6 deg., 5.2 deg. Cooler than the previous week. Precipitation was 0.15 inch. Compared with the same week in 2005, the week was 1.0 deg. Cooler, and 0.12 inch wetter.

The final two days of the month were warm, with only a few isolated showers over the south during the late-afternoons.

• 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.

JULY 2006

DY MX MN OBS PCPN REMARKS

• 01 95 70 85
• 02 91 70 78 0.26 T, PCPN 2200-2300
• 03 86 72 84
• 04 87 72 84
• 05 85 74 74 1.77 T, PCPN 1900-2400
• 06 89 72 87
• 07 90 67 86
• 08 92 68 90
• 09 93 74 91
• 10 95 74 92
• 11 96 76 94
• 12 98 75 95
• 13 99 77 95
• 14 98 77 96
• 15 99 77 96
• 16 101 78 98100 80 87
• 17 100 80 87
• 18 103 76 99
• 19 99 78 97
• 20 99 74 97 0.06
• 21 99 76 96
• 22 96 75 90 0.64 MX 1200-2400 91, PCPN TIME MISSING
• 23 92 73 86
• 24 93 71 90
• 25 93 73 87
• 26 87 72 79 0.03
• 27 92 74 87 0.12 PCPN 0600-0700
• 28 95 76 93
• 29 96 75 94
• 30 97 75 94
• 31 96 75 93

JULY 2006, RECORDS AND SUMMARY:

• HIGHEST TEMPERATURE 103 ON THE 18TH,
• LOWEST TEMPERATURE 67 ON THE 7TH;
• AVERAGE MAXIMUM 94.2 F.,
• AVERAGE MINIMUM 74.1 F.,
• AVERAGE TEMPERATURE 84.1 F.;
• 0.7 DEG. WARMER THAN NORMAL.
• HEATING DEGREE DAYS0,
• 0 PERCENT OF NORMAL HEATING DEGREE DAYS.
• COOLING DEGREE DAYS 593,
• 104.4 PERCENT OF NORMAL COOLING DEGREE-DAYS;
• TOTAL PRECIPITATION 2.90 IN.,
• 0.74 IN. GREATER THAN MONTHLY NORMAL.
• 134.3 PERCENT OF NORMAL MONTHLY PRECIPITATION.
• YEAR-TO-DATE PRECIPITATION 21.74 IN.,
• 3.26 IN. LESS THAN NORMAL YEAR-TO-DATE PRECIPITATION,
• 87.0 PERCENT OF NORMAL YEAR-TO-DATE PRECIPITATION;
• 3 DAYS ON WHICH THUNDERSTORMS OCCURRED;
• 0 DAYS ON WHICH THE VISIBILITY WAS HEAVILY RESTRICTED BY FOG, SMOKE, OR HAZE;
• 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.
• 6 DAYS ON WHICH MEASURABLE PRECIPITATION OCCURRED.
• 26 DAYS ON WHICH THE MAXIMUM TEMPERATURE REACHED OR EXCEEDED 90 DEG.;
• 3 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,
• 1684 YEAR-TO-DATE COOLING DEGREE DAYS.
• PERCENTAGE OF NORMAL YEAR-TO-DATE COOLING DEGREE DAYS: 117.8,
• PRECIPITATION DURING THE PREVIOUS TWELVE MONTHS 29.01 IN.,
• TWELVE-MONTH PRECIPITATION PERCENTAGE 64.1.

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