June 2001

Report and Summary

Tyler, Texas
June 2001
by Robert K. Peters, Ph.D.
National Weather Service Cooperating Observer

The month of June 2001 was cooler and wetter than normal.

The remnants of Tropical Storm Allison plus a couple of stubborn upper air low pressure troughs over Central and Eastern north America were responsible for the damp and comparatively mild weather.

June 2001 was 1.2 degrees cooler than June 2000, and 2.51 inches wetter. Year-to-date rainfall through June 30, 2001 was 5.01 inches greater than through the same date one year ago. Rainfall during the twelve months ending June 30, 2001 was 137.2 percent of normal.

The thirty-day outlook for June 2001 had called for near normal temperatures and below normal precipitation.

The week May 27-June 2 saw temperatures two degrees warmer than normal, and rainfall about 300 percent of normal.

Two storms crossed during the week--one on the 27th and a second on the 31st. Both produced widespread rainfall.

The rain with the second storm was particularly heavy over the central counties, and there were a few occurrences of severe weather early on the morning of the 31st.

Otherwise, upper air high pressure kept temperatures warm and a southerly surface flow kept conditions humid.

The week June 3-9 saw temperatures near normal and rainfall about 300 percent of normal.

Tropical Storm Allison was the week's principal weathermaker in East Texas.

The storm formed off Galveston on the 5th, came onshore early the following morning, and meandered over East Texas through the 9th.

It brought torrential rains to parts of the region, with amounts of ten inches or more in the Lufkin-Nacogdoches area. Farther to the north, amounts along the IH-20 Corridor were from two and one-half to nearly five inches. There were incidents of flood damage in the area, with a bridge washed out on FM-14 just north of Tyler. Rain fell in Tyler daily between the 5th and 9th.

The presence of clouds and rain held daytime temperatures down and nighttime temperatures up.

The week June 10-16 saw temperatures two degrees warmer than normal, and rainfall 125 percent of normal.

The remnant of Allison departed on the 10th.

A migratory storm and cold front crossed on the 14th/15th. This brought severe weather to the northern and western counties on the evening of the 14th.

A Tropical Maritime air mass, present in the area prior to the arrival of the front of the 14th, held temperatures up. It was replaced by a Polar Maritime air mass on the 15th. This lowered temperatures and humidities.

The week June 17-23 saw temperatures one degree below normal and rainfall about one-sixth of normal.

During the first part of the week, modified Polar air remained over the region. This dry air mass brought mild nighttime and seasonably warm daytime temperatures.

At mid-week, Tropical air returned, raising nighttime temperatures and humidity.

On the 21st, another storm system and cold front. crossed.

This brought the week's only rain, and lowered temperatures with a cool and dry air mass.

The week June 24-30 saw temperatures three degrees cooler than normal and rainfall 175 percent of normal.

At the beginning of the week, a modified Polar air mass was over the area.

By mid-week, a closed-off upper air low had stationed itself over Southern Missouri. This brought the week's rainfall. The combination of clouds and rain held down daytime high temperatures, thought nighttime low readings were near normal.

Flash flooding and severe weather accompanied the storm. On the 27th, the most intense weather was over the southern counties, while on the 28th, 29th, and 30th, intense weather was over the northern counties.

• 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

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 1961-1990.

JUNE 2001

• 01 83 61 81 2.36
• 02 90 67 89
• 03 90 75 88
• 04 89 74 78 T, PCPN 2000-2100
• 05 84 71 72 0.06 PCPN 2100-2400
• MIN 0000-1200 74
• 06 77 69 71 0.58 T, PCPN 0800-1100, 2100-2400
• 07 76 71 75 1.08 PCPN 0500-0800, 1200-1600
• 08 78 71 75 0.07 PCPN 1000-1100, 2200-2400
• 09 85 69 81 0.97 T, PCPN 0000-0600, 2300-2400
• 10 87 69 84 0.28 F, PCPN 0000-0100
• 11 90 67 87
• 12 91 68 88
• 13 92 74 89
• 14 92 77 88
• 15 88 65 85 0.98 T, PCPN 0400-1000 MAX 1200-2400 87
• 16 90 65 86
• 17 90 65 87
• 18 90 65 87
• 19 90 69 85
• 20 90 71 87
• 21 92 72 86
• 22 86 68 78 0.12 T, PCPN 0000-0100 MAX 1200-2400 85
• 23 86 61 82
• 24 88 62 85
• 25 88 65 83
• 26 89 67 86
• 27 86 70 74 T
• 28 83 65 80 1.38 T, PCPN 0800-1100, 1200-1500
• 29 87 70 80 0.22 T, PCPN 1600-1700
• 30 84 71 80 0.01 PCPN 1700-1800

JUNE 2001, RECORDS AND SUMMARY:

• 1ST RECORD PRECIPITATION, 2.36
• INCHES; REPLACES 1.84 INCHES MEASURED IN 1903 AND 1912;
• 21ST: SUMMER SOLSTICE, 0738Z;
• HIGHEST TEMPERATURE 92ON THE 13TH, 14TH, AND 21ST;
• LOWEST TEMPERATURE 61ON THE 1ST AND 23RD;
• AVERAGE MAXIMUM 87.0 F.;
• AVERAGE MINIMUM 68.5 F.;
• 1.1 DEG. COOLER THAN NORMAL.
• 0 HEATING DEGREE DAYS
• 0 PERCENT OF NORMAL HEATING DEGREE DAYS.
• 383 COOLING DEGREE DAYS
• 80.3 PERCENT OF NORMAL COOLING DEGREE-DAYS;
• TOTAL PRECIPITATION 8.11 IN.,
• 4.20 IN. MORE THAN NORMAL.
• 207.4 PERCENT OF NORMAL PRECIPITATION.
• YEAR-TO-DATE PRECIPITATION 37.12 IN.;
• 8 DAYS ON WHICH THUNDERSTORMS OCCURRED;
• 1 DAYS ON WHICH THE VISIBILITY WAS 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.
• 12 DAYS ON WHICH MEASURABLE PRECIPITATION OCCURRED.
• 12 DAYS ON WHICH THE MAXIMUM TEMPERATURE REACHED OR EXCEEDED 90 DEG.;
• 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.
• 2680 SEASON-TO-DATE HEATING DEGREE DAYS,
• 850 YEAR-TO-DATE COOLING DEGREE DAYS.

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