June 2007

Report and Summary

Tyler, Texas
June 2007
by Robert K. Peters, Ph.D.
National Weather Service Cooperating Observer

The month of June 2007 goes into the record books as the fifth wettest June since weather records began in Tyler in 1896. It replaces June 1987 with a rainfall total of 8.57 inches, besting that month by 0.46 inch. Otherwise, the month was slightly cooler than normal. For much of the month, closed upper air low pressure centers wandered around North Texas, causing the rains. Flooding occurred in the region during two periods: the 15th-16th, and the 25th-28th. June 2007 was 1.2 deg. Cooler than June 2006, and 7.45 inches wetter. Year-to-date rainfall was nearly double in 2007 through the end of June compared with 2006. The difference was 17.34 inches. The precipitation percentage during the previous twelve months was also nearly double in 2007 where it stood in 2006: 123.1 in 2007 compared with 64.7 percent in 2006. The thirty-day outlook for June 2007 had called for near normal temperatures and near normal precipitation.

The week May 27-June 2 saw temperatures about 2 degrees below normal, and near normal rainfall. A series of upper air disturbances crossed the region during the week. These combined with weak frontal boundaries and a very moist air mass to bring rainfall on five days. The week's average temperature was 75.1 deg., and precipitation was 0.85 inch. This was 2.6 deg. Warmer than the previous week. Compared with the same week in 2006, the week was 4.5 deg. Cooler and 0.72 inch wetter.

The week June 3-9 saw temperatures about a degree above normal, and rainfall about 140 percent of normal. Upper air high pressure built into the area at mid-week, which brought very warm readings on the 7th, 8th, and 9th. In fact, the first 90-degree reading of the Summer was observed on the 7th 30 days later than the median of May 8th. Otherwise, weak sea-breeze front activity along with weaknesses in the upper air high permitted rainfall on five days. The week's average temperature was 79.4 deg., and rainfall was 1.13 inches. This was 4.2 deg. Warmer than the previous week. Compared with the same week in 2006, the week was 4.6 deg. Cooler and 1.12 inches wetter.

The week June 10-16 saw temperatures near normal, and rainfall about 200 percent of normal. Upper air high pressure continued dominating the region's weather until the 14th, when a slow-moving upper air low approached from the northwest. Temperatures were warm early in the week with scattered showers each afternoon from daytime heating and the moist air mass. A weak cold front entering from the northeast on the 13th brought an increase in shower activity. As the upper air low drew nearer, heavy rainfall occurred, with flooding on the morning of the 16th in Smith, Gregg, and Upshur Counties. Lake Tyler went above its spillway on the evening of the 14th. The week's average temperature was 80.4 deg., and rainfall was 1.71 inches. This was 1.0 deg. Warmer than the previous week. Compared with the same week in 2006, the week was 0.6 deg. Cooler, and 1.11 inches wetter.

The week June 17-23 saw temperatures about a degree below normal, and near normal rainfall. An upper air low pressure trough controlled the weather for all of the week except on the 18th and 19th when temperatures climbed into the 90s and rain was largely absent from East Texas. Rain returned on the 20th, and there was scattered shower activity daily from then into the end of the week. A few of the late-day thunderstorms on the 20th and 21st reached severe limits, and there were occurrences of flooding in counties to the northeast of Tyler. The week's average temperature was 79.9 deg., and rainfall was 0.68 inch. This was 0.5 deg. Cooler than the previous week. Compared with the same week in 2006, the week was 1.3 deg. Cooler, and 0.18 inch wetter.

The week June 24-30 saw about 3 degrees cooler than normal, and rainfall about 500 percent of normal. The week was mild and very wet. An upper air trough meandered around North Texas, bringing rain somewhere in the region daily. Flooding occurred in Tyler on the morning of the 25th, and over the western and northern counties that evening, and again on the 26th, 27th, and 28th. Compared with the previous week, the week was 0.9 deg. Cooler.

Compared with the same week in 2006, the week was 0.6 deg. Cooler. There was no rain during the week in 2006.

• 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.

JUNE 2007

• DY MX MN OBS PCPN REMARKS
• 01 86 69 83
• 02 87 65 83 0.07 PCPN 0900-1100
• 03 83 67 78 0.53 T, PCPN 1600-1800 MX. 1200-2400 82
• 04 87 67 77 0.04 PCPN 1600-1800
• 05 89 63 85 0.01 PCPN 0000-0100
• 06 89 64 86
• 07 93 74 89
• 08 93 75 75 0.47 T, PCPN 1600-1700, 2300-2400 MN 0000-1200 78
• 09 94 74 85 0.08 T, PCPN 0000-0100
• 10 92 72 88
• 11 92 71 90
• 12 94 74 91
• 13 92 72 79 tr. T
• 14 91 70 80 MN 0000-1200 71
• 15 77 69 76 0.79 T, PCPN 0000-0200, 1700-1900, 2100-2200
• 16 77 69 75 0.92 T, PCPN 1100-1800
• 17 80 69 77 0.16 T, PCPN 1700-1800, 2000-2200,2300-2400
• 18 92 74 88
• 19 94 77 92
• 20 88 72 85 MN 0000-1200 76
• 21 86 70 80
• 22 89 70 84 0.25 T, PCPN 0000-0300
• 23 89 71 83 0.27 PCPN 1200-1400 MN 0000-1200 72
• 24 86 69 83
• 25 86 70 76 3.17 T, PCPN 1000-1300, 1800-2100
• 26 86 71 77 0.28 T, PCPN 1800-2000 MN 0000-1200 72
• 27 88 71 85 1.40 T, PCPN 0500-0800
• 28 90 73 81 tr. T
• 29 90 71 85 0.13 T, PCPN 2100-2200
• 30
• 30 92 73 81

• JUNE 2007, RECORDS AND SUMMARY:
• 21ST, 1806 ASTRONOMICAL ONSET OF SUMMER;
• 25TH, FLOODING RAINS;
• HIGHEST TEMPERATURE 94 ON THE 9TH,
• LOWEST TEMPERATURE 63 ON THE 5TH,
• AVERAGE MAXIMUM 88.4 F.,
• AVERAGE MINIMUM 70.4 F.,
• AVERAGE TEMPERATURE 79.4 F.,;
• 0.5 DEG. COOLER THAN NORMAL.
• HEATING DEGREE DAYS 0,
• 0 PERCENT OF NORMAL HEATING DEGREE DAYS.
• COOLING DEGREE DAYS 432,
• 96.4 PERCENT OF NORMAL COOLING DEGREE-DAYS;
• TOTAL PRECIPITATION 8.57 IN.,
• 4.92 IN. MORE THAN MONTHLY NORMAL.
• 234.8 PERCENT OF NORMAL MONTHLY PRECIPITATION.
• YEAR-TO-DATE PRECIPITATION 35.45 IN.,
• 12.61 IN. GREATER THAN NORMAL YEAR-TO-DATE PRECIPITATION,
• 155.2 PERCENT OF NORMAL YEAR-TO-DATE PRECIPITATION;
• 13 DAYS ON WHICH THUNDERSTORMS OCCURRED;
• 1 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.
• 15 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.
• 2128 SEASON-TO-DATE HEATING DEGREE DAYS,
• 108.7 PERCENTAGE OF NORMAL SEASON-TO-DATE HEATING DEGREE DAYS:
• 846 YEAR-TO-DATE COOLING DEGREE DAYS.
• PERCENTAGE OF NORMAL YEAR-TO-DATE COOLING DEGREE DAYS: 98.3;
• PRECIPITATION DURING THE PREVIOUS TWELVE MONTHS 55.71 IN.,
• TWELVE-MONTH PRECIPITATION PERCENTAGE 123.1.

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