October 2007

Report and Summary

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

The month of October 2007 was warmer and drier than normal. Starting out with above normal temperatures, an abrupt turn to cool readings came on the 22nd. Persistent upper air high pressure to the west and south of the region kept moisture from the Gulf of Mexico largely closed off to the area, and limited rainfall. Compared with October 2006, the month was 1.6 degrees warmer, and 2.71 inches drier. Year-to-date rainfall through the end of the month was 23.83 inches more in 2007 than in 2006. However, October 2007 continued a trend, beginning in mid-July, of much below normal rainfall. The thirty-day outlook for October 2007 had called for near normal temperatures and above normal precipitation.

The week September 30-October 6 saw temperatures about 8 degrees above normal, and no measurable rainfall. Except for a weak cold front on the 2nd, the area was under upper air high pressure with Tropical Maritime air in control. The week's average temperature was 79.5 deg., which was 0.3 deg. Warmer than the previous week. Compared with the same week in 2006, the week was 2.0 deg. Warmer, and there was no rain in 2006.

The week October 7-13 saw temperatures about 6 degrees above normal, and no rainfall. A cold front crossed on the 9th, and replaced the Tropical Maritime air with Polar Maritime air. This lowered temperatures closer to seasonal normals for the last half of the week. There were a few scattered showers with the front. The week's average temperature was 74.5 deg., which was 5.0 deg. Cooler than the previous week. Compared with the same week in 2006, the week was 8.6 deg. Warmer, and 1.35 inches drier.

The week October 14-20 saw temperatures about 3 degrees above normal, and rainfall about 50 percent of normal. A crossing disturbance on the 15th brought the week's rain, with amounts of nearly 6 inches over the northern counties. Otherwise, a mild air mass was replaced on the 17th by a Tropical Maritime air mass, which was replaced on the 18th by a Polar Maritime air mass. The mild temperatures of early in the week were replaced by very warm readings at mid- week, and a cooling trend late in the week. The week's average temperature was 69.9 deg., which was 4.6 deg. Cooler than the previous week. Rainfall was 0.54 inch. Compared with the same week in 2006, the week was 3.2 deg. Warmer, and 0.80 inch drier.

The week October 21-27 saw temperatures about 5 degrees cooler than normal, and rainfall about one-half normal. A dramatic change occurred early in the week, and persisted through the end of the month. A strong cold front crossed on the 22nd, bringing widespread showers and thunderstorms, and introducing cool and dry weather as several reinforcing shots of cool air reached the region. Surface and upper air high pressure were in control, and there was no rain. The week's average temperature was 58.8 deg., which was 11.1 deg. Cooler than the previous week. Precipitation was 0.65 inch. Compared with the same week in 2006, the week was 0.9 inch cooler, and 0.56 inch drier.

The final four days in the month saw a slight warming trend ahead of a front crossing on the night of the 31st. With dry air and upper air high pressure, there were very few clouds and no rain.

• 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.

OCTOBER 2007

• 01 91 73 84
• 02 90 72 83
• 03 87 67 80
• 04 91 65 83
• 05 86 70 82
• 06 86 75 81
• 07 91 73 85
• 08 90 71 82 tr.
• 09 86 68 78
• 10 86 59 75
• 11 84 56 74
• 12 84 56 73
• 13 82 57 75
• 14 85 60 71
• 15 73 60 64 0.54 T, PCPN 0900-1000, 1500-1900
• 16 76 61 73
• 17 87 67 78
• 18 86 56 73 MIN 0000-1200 = 73
• 19 81 49 67
• 20 86 51 77
• 21 86 62 78
• 22 69 49 53 0.64 PCPN 1300-1900 MN 0000-1200 65, MX 1200-2400 65
• 23 66 44 58 0.01 PCPN 0800-0900 MN 0000-1200 46
• 24 68 43 60
• 25 66 43 57
• 26 70 42 57
• 27 70 45 62
• 28 73 47 63
• 29 71 46 60
• 30 74 45 63
• 31 79 49 68

• OCTOBER 2007, RECORDS AND SUMMARY:
• 6TH EQUALED RECORD HIGH MINIMUM 75, FIRST SET 1928 AND 1982;
• HIGHEST TEMPERATURE 91 ON THE 1ST, 4TH, AND 7TH;
• LOWEST TEMPERATURE 42 ON THE 26TH;
• AVERAGE MAXIMUM 80.6 F.,
• AVERAGE MINIMUM 57.5 F.,
• AVERAGE TEMPERATURE 69.1 F.,
• 1.7 DEG. WARMER THAN NORMAL.
• HEATING DEGREE DAYS 71,
• 156.7 PERCENT OF NORMAL HEATING DEGREE DAYS.
• COOLING DEGREE DAYS 196,
• 163.3 PERCENT OF NORMAL COOLING DEGREE-DAYS;
• TOTAL PRECIPITATION 1.19 INCH.,
• 3.95 IN. LESS THAN MONTHLY NORMAL.
• 23.2 PERCENT OF NORMAL MONTHLY PRECIPITATION.
• YEAR-TO-DATE PRECIPITATION 51.96 IN.,
• 15.93 IN. GREATER THAN NORMAL YEAR-TO-DATE PRECIPITATION,
• 144.2 PERCENT OF NORMAL YEAR-TO-DATE PRECIPITATION;
• 1 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.
• 3 DAYS ON WHICH MEASURABLE PRECIPITATION OCCURRED.
• 5 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.
• 71 SEASON-TO-DATE HEATING DEGREE DAYS,
• 151.1 PERCENTAGE OF NORMAL SEASON-TO-DATE HEATING DEGREE DAYS:
• 2510 YEAR-TO-DATE COOLING DEGREE DAYS.
• 100.1 PERCENTAGE OF NORMAL YEAR-TO-DATE COOLING DEGREE DAYS:
• PRECIPITATION DURING THE PREVIOUS TWELVE MONTHS 62.23 IN.,
• TWELVE-MONTH PRECIPITATION PERCENTAGE 137.4.

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