WFO San Angelo Climatology

 September 2009 Climate Summary

...PRECIPITATION VARIED FROM WELL ABOVE TO WELL BELOW NORMAL
IN SEPTEMBER...

OVERALL...THE MONTHLY PRECIPITATION WAS BELOW NORMAL ACROSS
MUCH OF THE WESTERN SECTIONS OF WEST CENTRAL TEXAS. A FEW
LOCATIONS FROM CROCKETT COUNTY TO WESTERN STERLING COUNTY
RECEIVED LESS THAN 25 PERCENT OF NORMAL. PRECIPITATION WAS
ABOVE NORMAL FOR THE MONTH ACROSS AREAS OF THE NORTHERN AND
EASTERN BIG COUNTRY...HEARTLAND...CONCHO VALLEY AND NORTHWEST
HILL COUNTRY. THE MONTHLY AMOUNTS WERE MUCH ABOVE NORMAL ACROSS
AN AREA BOUNDED BY A LINE FROM JUNCTION TO SAN ANGELO TO
RICHLAND SPRINGS...AND BACK TO JUNCTION.

TEMPERATURES AVERAGED BELOW NORMAL FOR THE MONTH.

AT ABILENE REGIONAL AIRPORT...THE AVERAGE TEMPERATURE FOR
SEPTEMBER WAS 72.6 DEGREES. THIS WAS 2.9 DEGREES BELOW THE
NORMAL AVERAGE TEMPERATURE OF 75.5 DEGREES. TOTAL PRECIPITATION
FOR SEPTEMBER WAS 3.55 INCHES. THIS WAS 0.64 INCHES ABOVE THE
MONTHLY NORMAL OF 2.91 INCHES.

AT SAN ANGELO REG5ONAL AIRPORT...THE AVERAGE TEMPERATURE FOR
SEPTEMBER WAS 74.6 DEGREES. THIS WAS 0.3 DEGREES BELOW THE
NORMAL AVERAGE TEMPERATURE OF 74.8 DEGREES. TOTAL
PRECIPITATION FOR SEPTEMBER WAS 5.66 INCHES. THIS WAS 2.71
INCHES ABOVE THE MONTHLY NORMAL OF 2.95 INCHES.

AT JUNCTION...THE TOTAL PRECIPTATION FOR SEPTEMBER WAS 4.75
INCHES.

...SEPTEMBER 2009 WEATHER HIGHLIGHTS...

HIGH PRESSURE AT THE SURFACE AND ALOFT BROUGHT WARM AND
DRY CONDITIONS DURING THE FIRST FEW DAYS OF THE MONTH. WITH
AN INCREASE IN MOISTURE AND WITH THE INFLUENCE OF A FEW
WEAK UPPER LEVEL DISTURBANCES...SCATTERED SHOWERS AND
THUNDERSTORMS DEVELOPED LATE ON THE 3RD ACROSS THE NORTHERN
BIG COUNTRY...AND OCCURRED ACROSS VARIOUS PARTS OF WEST
CENTRAL TEXAS FROM THE 5TH THROUGH THE 8TH. THE ABILENE
REGIONAL AIRPORT RECORDED A 43 MPH WIND FROM A THUNDERSTORM
ON THE EVENING OF THE 4TH.

SHOWERS AND THUNDERSTORMS INCREASED IN COVERAGE ON THE 9TH...
AND A RATHER WET PERIOD OCCURRED ACROSS WEST CENTRAL TEXAS
FROM THE 10TH TO THE 13TH. A WEAK UPPER LEVEL LOW PRESSURE
SYSTEM MEANDERED ACROSS CENTRAL TEXAS DURING THAT TIME. WITH
ABUNDANT MOISTURE WRAPPING AROUND THIS LOW PRESSURE SYSTEM AND
INTO WEST CENTRAL TEXAS...SHOWERS AND SCATTERED THUNDERSTORMS
OCCURRED WITH HEAVY RAIN.

FROM THE 8TH TO 13TH...RAINFALL AMOUNTS OF 3 TO 4 INCHES WERE
COMMON ACROSS MOST OF THE BIG COUNTRY (INCLUDING ABILENE)...THE
SOUTHERN HALF OF THE CONCHO VALLEY (INCLUDING SAN ANGELO)...
THE NORTHWEST HILL COUNTRY AND SOUTHERN HEARTLAND. WITHIN THIS
LARGER AREA...AMOUNTS OF 3 TO 5 INCHES OCCURRED EAST AND
SOUTHEAST OF SAN ANGELO TOWARD BRADY...MASON AND JUNCTION.
THESE AMOUNTS ALSO OCCURRED IN SCATTERED POCKETS ACROSS THE BIG
COUNTRY. THE HIGHEST RAINFALL TOTALS OF 5 TO 6 INCHES OCCURRED
AT SCATTERED LOCATIONS GENERALLY BETWEEN SAN ANGELO...BRADY...
MASON AND JUNCTION. RECORD DAILY RAINFALL AMOUNTS WERE SET AT
SAN ANGELO ON THE 10TH AND 13TH.

THE WIDESPREAD COVERAGE OF RAINFALL DURING THIS TIME FRAME
WAS BENEFICIAL TO THE REGION...BRINGING SHORT TERM RELIEF TO
THE AREAS WHICH WERE EXPERIENCING DROUGHT CONDITIONS. THE
WIDESPREAD COVERAGE OF CLOUDS AND PRECIPITATION HELD DAYTIME
TEMPERATURES DOWN DURING THIS TIME AS WELL. HIGHS WERE IN THE
70S ACROSS MOST OF WEST CENTRAL TEXAS FROM THE 11TH THROUGH
13TH. A RECORD LOW MAXIMUM TEMPERATURE WAS SET AT SAN ANGELO
ON THE 12TH.

A MORE TRANQUIL PATTERN OCCURRED DURING THE MIDDLE OF THE
MONTH...WITH THE PREVAILING INFLUENCE OF HIGH PRESSURE.

ON THE 20TH...AN UPPER LEVEL DISTURBANCE BROUGHT SCATTERED
SHOWERS AND THUNDERSTORMS TO THE NORTHERN EDWARDS PLATEAU...
AND TO THE SOUTHWESTERN BIG COUNTRY...NORTHERN CONCHO VALLEY
AND NORTHERN HEARTLAND. STRONG THUNDERSTORM WINDS IN ELDORADO
DAMAGED A STORAGE BUILDING AND SNAPPED A UTILITY POLE. STRONG
WINDS FROM ANOTHER SEVERE STORM IN WINTERS DOWNED SEVERAL
POWERLINES AND TREES. THE GREATEST RAINFALL AMOUNTS (BETWEEN
1.5 AND 3 INCHES) OCCURRED IN TH AREA BETWEEN WESTERN COLEMAN
COUNTY AND SOUTHERN NOLAN COUNTY. 

WITH THE APPROACH OF A STRONG COLD FRONT INTO AN UNSTABLE
AIRMASS...A COUPLE OF SEVERE THUNDERSTORMS OCCURRED ON THE
LATE AFTERNOON AND EVENING OF THE 21ST. NICKEL SIZE HAIL WAS
REPORTED IN CLYDE AND NEAR BROWNWOOD...AND PENNY SIZE HAIL
OCCURRED 2 MILES NORTHEAST OF GLEN COVE (COLEMAN COUNTY).

FROM THE 22ND TO THE 24TH...AN UPPER LEVEL LOW PRESSURE
SYSTEM WAS SITUATED OVER THE CENTRAL HIGH PLAINS...AND MOVED
LITTLE DURING THAT TIME. A FEW DISTURBANCES ROTATED AROUND
THE SOUTHERN PERIPHERY OF THIS SYSTEM AND INTO TEXAS...
BRINGING PERIODIC RAIN SHOWERS.

SOME RAIN SHOWERS OCCURRED MAINLY ACROSS SOUTHEASTERN SECTIONS
OF WEST CENTRAL TEXAS ON THE 22ND AND 23RD. RAINFALL AMOUNTS
WERE MOSTLY LESS THAN ONE QUARTER OF AN INCH. RAIN SHOWERS
ALSO OCCURRED ACROSS THE NORTHWESTERN HALF OF WEST CENTRAL
TEXAS ON THE 24TH. THE HIGHER AMOUNTS...GENERALLY IN THE ONE
QUARTER TO ONE HALF INCH RANGE...OCCURRED ACROSS THE NORTHERN
AND WESTERN BIG COUNTRY INTO A SMALL PART OF THE NORTHERN
CONCHO VALLEY. DAYTIME TEMPERATURES WERE CONSIDERABLY COOLER
ON THE 22ND THROUGH 24TH...WITH HIGHS WERE MOSTLY IN THE 70S.
TEMPERATURES DIPPED INTO THE MID 40S TO LOWER 50S FOR LOWS ON
THE EARLY MORNING OF THE 25TH...AS HIGH PRESSURE SETTLED INTO
THE REGION.

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS OCCURRED ACROSS
SOUTHEASTERN SECTIONS OF WEST CENTRAL TEXAS ON THE 28TH WITH
THE ARRIVAL OF A COLD FRONT. ISOLATED LOCATIONS RECEIVED OVER
AN INCH OF RAINFALL. A WEAK UPPER LEVEL DISTURBANCE GENERATED
SCATTERED SHOWERS AND THUNDERSTORMS ACROSS SOUTHEASTERN SECTIONS
OF WEST CENTRAL TEXAS ON THE MORNING OF THE 29TH. ISOLATED
LOCATIONS RECEIVED OVER AN INCH OF RAINFALL FROM THIS SYSTEM.

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