WFO San Angelo Climatology

PUBLIC INFORMATION STATEMENT...CORRECTED 4TH TO 9TH WETTEST
NATIONAL WEATHER SERVICE SAN ANGELO TX
1115 AM CDT MON AUG 3 2009

...9TH WETTEST JULY ON RECORD AT SAN ANGELO...

TOTAL PRECIPITATION FOR JULY WAS WELL ABOVE NORMAL FOR MUCH
OF WEST CENTRAL TEXAS...AND WAS BELOW NORMAL IN SCATTERED
POCKETS ACROSS THE REGION. MONTHLY AMOUNTS IN THE 3 TO 6
INCH RANGE WERE COMMON ACROSS MUCH OF THE AREA. FOR SOME
LOCATIONS THESE AMOUNTS WERE 3 TO 6 TIMES THE NORMAL VALUES.
THE SCATTERED POCKETS...WHICH RECEIVED BELOW NORMAL AMOUNTS
OF LESS THAN ONE INCH...WERE EAST OF ABILENE...EAST AND
SOUTHEAST OF MASON...AND IN THE JUNCTION OF IRION...TOM GREEN
AND STERLING COUNTIES. LARGER AREAS OF CROCKETT COUNTY ALSO
RECEIVED BELOW NORMAL AMOUNTS OF LESS THAN ONE INCH.

TEMPERATURES AVERAGED ABOVE NORMAL FOR THE MONTH.

AT ABILENE REGIONAL AIRPORT...THE AVERAGE TEMPERATURE FOR
JULY WAS 84.1 DEGREES. THIS WAS 0.6 DEGREES ABOVE THE NORMAL
AVERAGE TEMPERATURE OF 83.5 DEGREES. TOTAL PRECIPITATION FOR
JULY WAS 2.56 INCHES. THIS WAS 0.86 INCHES ABOVE THE
NORMAL OF 1.70 INCHES.

AT SAN ANGELO REGIONAL AIRPORT...THE AVERAGE TEMPERATURE FOR
JULY WAS 84.9 DEGREES. THIS WAS 2.5 DEGREES ABOVE THE NORMAL
AVERAGE TEMPERATURE OF 82.4 DEGREES. TOTAL PRECIPITATION FOR
JULY WAS 4.64 INCHES. THIS WAS 3.54 INCHES ABOVE THE MONTHLY
NORMAL OF 1.10 INCHES.

THE NUMBER OF DAYS WHERE HIGH TEMPERATURES REACHED 100
DEGREES OR MORE INCLUDE 10 AT ABILENE...11 AT SAN ANGELO...
AND 9 AT JUNCTION.

JULY 2009 WEATHER HIGHLIGHTS...

AS AN UPPER LEVEL DISTURBANCE MOVED INTO THE REGION...SCATTERED
SHOWERS AND THUNDERSTORMS OCCURRED ACROSS MUCH OF WEST CENTRAL
TEXAS ON THE 1ST. THESE WERE MORE CONCENTRATED ACROSS THE
SOUTHEASTERN CONCHO VALLEY...SOUTHERN HEARTLAND AND NORTHWEST
HILL COUNTRY. ACROSS THAT AREA...RAINFALL AMOUNTS BETWEEN 1.5
AND 3 INCHES OCCURRED AT SCATTERED LOCATIONS.

THE WEATHER PATTERN ACROSS THE REGION DURING JULY WAS MOSTLY
INFLUENCED BY TWO ALTERNATING WEATHER REGIMES:  A HIGH PRESSURE
SYSTEM ALOFT...AND A NORTH TO NORTHWESTERLY UPPER LEVEL FLOW
PATTERN.

THE UPPER LEVEL HIGH PRESSURE SYSTEM TEMPORARILY BUILT BACK TO
THE EAST ACROSS TEXAS ON THE 2ND THROUGH THE 5TH...BRINGING HOT
TEMPERATURES.

THEN...AS THIS HIGH PRESSURE SYSTEM WEAKENED AND SHIFTED
WESTWARD...A FEW DISTURBANCES ALOFT MOVED DOWN INTO THE REGION
AND BROUGHT SHOWERS AND THUNDERSTORMS TO THE AREA ON 5TH TO THE
7TH. THESE WERE LOCATED ACROSS THE BIG COUNTRY BETWEEN MIDNIGHT
AND NOON ON THE 5TH. SOME LOCATIONS ACROSS THE NORTHERN AND
WESTERN BIG COUNTRY RECEIVED AMOUNTS BETWEEN ONE HALF AND 1.5
INCHES. MOST OF THE SHOWER AND THUNDERSTORM ACTIVITY OCCURRED
FARTHER TO THE SOUTH BETWEEN MIDNIGHT AND THE MID-MORNING HOURS
OF THE 6TH...ACROSS THE REGION SOUTHEAST OF A LINE FROM BIG LAKE
TO ABILENE TO CISCO. THE SHOWERS AND STORMS WERE MOST
CONCENTRATED IN A BAND EXTENDING FROM CROCKETT COUNTY NORTHEAST
ACROSS TOM GREEN COUNTY...THEN EAST ACROSS THE HEARTLAND. WITHIN
THIS BAND...POCKETS OF HEAVIER RAINFALL OCCURRED...WITH AMOUNTS
BETWEEN 1.5 AND 3 INCHES. A FEW LOCATIONS IN BROWN AND FAR
SOUTHERN RUNNELS COUNTIES RECEIVED OVER 3 INCHES OF RAIN.

WITH THE PRECIPITATION AND MORE EXTENSIVE CLOUD COVERAGE...
TEMPERATURES WERE HELD INTO THE 80S FOR HIGHS ACROSS MUCH OF
WEST CENTRAL TEXAS ON THE 5TH AND 6TH.

THE UPPER LEVEL HIGH PRESSURE SYSTEM BUILT BACK OVER TEXAS
AND THE SOUTHERN PLAINS ON THE 7TH THROUGH THE 16TH. THIS
HIGH PRESSURE SYSTEM WAS STRONG AND COVERED A MORE EXPANSIVE
AREA...AND BROUGHT HOT AND DRY CONDITIONS TO WEST CENTRAL
TEXAS. DAILY HIGH TEMPERATURES ACROSS WEST CENTRAL TEXAS WERE
GENERALLY IN THE 100 TO 105 DEGREE RANGE DURING THIS TIME.
RECORD HIGH TEMPERATURES WERE SET AT ABILENE AND TIED AT
SAN ANGELO ON THE 9TH.

ANOTHER CHANGE IN THE PATTERN OCCURRED...STARTING ON THE 17TH.
THE STRONG UPPER LEVEL HIGH PRESSURE SYSTEM SHIFTED WESTWARD TO
THE FOUR-CORNERS REGION AND THE INTERMOUNTAIN WEST. THIS
ALLOWED A NORTH TO NORTHWEST FLOW PATTERN ALOFT TO DEVELOP OVER
THE SOUTHERN PLAINS AND TEXAS. THIS ALLOWED AN UNUSUAL JULY
COLD FRONT TO DROP SOUTH INTO WEST CENTRAL TEXAS ON THE 17TH.
AHEAD OF THIS FRONT...SCATTERED SHOWERS AND THUNDERSTORMS
OCCURRED FROM NORTH TO SOUTH ACROSS THE REGION...ON THE 17TH.
MOST OF THE RAINFALL WAS LESS THAN ONE QUARTER OF AN INCH...
BUT A FEW LOCATIONS RECEIVED AMOUNTS BETWEEN A QUARTER OF AN
INCH AND ONE INCH. AN ISOLATED AMOUNTS OVER AN INCH OCCURRED
IN FAR SOUTHWESTERN THROCKMORTON COUNTY. AT ABILENE...A PEAK
WIND GUST OF 44 MPH OCCURRED DURING THE POST-MIDNIGHT HOURS OF
THE 17TH.

WITH THIS CHANGED SETUP IN THE FLOW PATTERN ALOFT (FROM THE
17TH TO THE 23RD)...SEVERAL UPPER LEVEL DISTURBANCES MOVED
DOWN INTO TEXAS...AND BROUGHT SHOWERS AND THUNDERSTORMS TO
VARIOUS PARTS OF THE REGION. ANOTHER WEAK COLD FRONT ALSO
MOVED SOUTH ACROSS WEST CENTRAL TEXAS ON THE 21ST. ON THE
19TH...THUNDERSTORM WINDS TO 60 MPH WERE REPORTED 2 MILES
SOUTH OF ROTAN (FISHER COUNTY)...AND STRONG THUNDERSTORM
WINDS DOWNED POWER LINES AND OVERTURNED GARBAGE DUMPSTERS IN
MENARD.

THIS CHANGE IN THE PATTERN BROUGHT BENEFICIAL RAINFALL TO MOST
OF WEST CENTRAL TEXAS. DURING THIS TIME PERIOD (16TH THROUGH
THE 24TH)...RAINFALL TOTALS WERE IN THE RANGE OF 1 TO 2 INCHES
AT SCATTERED LOCATIONS IN THE BIG COUNTRY NORTH OF INTERSTATE
20...AND ACROSS MUCH OF THE AREA SOUTH OF INTERSTATE 20 TO THE
INTERSTATE 10 CORRIDOR. THE MOST NOTABLE EXCEPTIONS WERE IN
SAN SABA COUNTY..PARTS OF SUTTON AND CROCKETT COUNTIES...AND
IN PARTS OF SHACKELFORD AND HASKELL COUNTIES...WHERE THE
AMOUNTS WERE LESS THAN ONE HALF INCH. A DAILY RAINFALL RECORD
OF 1.2 INCHES WAS SET AT SAN ANGELO ON THE 22ND.

WITH THE COMBINATION OF INCREASED CLOUD COVER...RAINFALL...AND
THE INTRUSION OF A COUPLE OF WEK COLD FRONTS...HIGH
TEMPERATURES WERE CONFINED TO THE 80S ON A FEW DAYS DURING
THIS PERIOD.

LATE IN THE MONTH THE UPPER LEVEL HIGH PRESSURE SYSTEM
TEMPORARILY SHIFTED EAST TOWARD TEXAS...AND HOTTER
TEMPERATURES OCCURRED ON THE 25TH TO 27TH.

THE HIGH PRESSURE SYSTEM RETREATED TO THE SOUTHWESTERN STATES
ONCE AGAIN DURING THE LAST FOUR DAYS OF THE MONTH. THIS ALLOWED
A COUPLE OF WEAK COLD FRONTS TO SAG SOUTH INTO WEST CENTRAL
TEXAS. THE RAINFALL WHICH OCCURRED DURING THIS TIME WAS
PRIMARILY THE RESULT OF A COUPLE OF THUNDERSTORM COMPLEXES...
WHICH MOVED SOUTH AND SOUTHEAST ACROSS WEST CENTRAL TEXAS...
BETWEEN THE HOURS OF MIDNIGHT AND NOON ON THE 29TH AND 30TH.
THESE BROUGHT MODERATE TO HEAVY RAIN...AND A FEW OF THE STORMS
ON THE 29TH AND 30TH WERE SEVERE.

DURING THE EARLY EVENING OF THE 29TH...NICKEL SIZE HAIL WAS
REPORTED FROM A STORM 2 MILES SOUTH OF TANKERSLEY (TOM GREEN
COUNTY). WITH A COMPLEX OF STORMS DURING THE POST MIDNIGHT HOURS
OF THE 30TH...WIND GUSTS OF 75 TO 80 MPH WERE REPORTED IN
ROSCOE...AND WINDS OF 65 TO 75 MPH DAMAGED A SHED AND LARGE TREE
LIMBS IN ROBY (BOTH IN FISHER COUNTY). IN ADDITION...A 64 MPH
WIND GUST WAS RECORDED IN HASKELL COUNTY (1 MILE NORTHWEST OF
HASKELL). AT THE ABILENE REGIONAL AIRPORT...A 52 MPH WIND GUST
WAS RECORDED.

SCATTERED AREAS BETWEEN SONORA AND BROWNWOOD...ACROSS THE
NORTHERN AND WESTERN BIG COUNTRY...AND ACROSS PARTS OF THE
CONCHO VALLEY RECEIVED RAINFALL AMOUNTS BETWEEN 1.5 AND 3
INCHES...WITH A FEW LOCALLY HIGHER TOTALS. MOST OF THE REST
OF WEST CENTRAL TEXAS RECEIVED AMOUNTS BETWEEN ONE HALF AND
1.5 INCHES. ON THE 31ST...NUMEROUS SHOWERS AND THUNDERSTORMS
OCCURRED ACROSS THE REGION WITH LOCALLY HEAVY RAINFALL. WITH A
COMBINATION OF RAINFALL AND CLOUD COVER...HIGH TEMPERATURES WERE
CONFINED TO THE 80S ACROSS MUCH OF WEST CENTRAL TEXAS ON THE
30TH AND 31ST.

$$