WFO San Angelo Climatology

MAY 2010 WEATHER SUMMARY FOR WEST-CENTRAL TEXAS

...PRECIPITATION VARIED CONSIDERABLY ACROSS WEST CENTRAL TEXAS IN MAY...

PRECIPITATION VARIED WIDELY ACROSS WEST CENTRAL TEXAS...FROM
WELL ABOVE TO WELL BELOW NORMAL. THE MONTHLY AMOUNTS RANGED
FROM LESS THAN ONE HALF INCH TO GREATER THAN 6 INCHES.
SCATTERED POCKETS ACROSS CROCKETT COUNTY AND INTO THE WESTERN
CONCHO VALLEY RECEIVED LESS THAN ONE HALF INCH. OTHER SCATTERED
POCKETS ACROSS THE SOUTHERN BIG COUNTRY...NORTHERN CONCHO
VALLEY AND NORTHWEST HILL COUNTRY RECEIVED MORE THAN 5 INCHES.
TEMPERATURES FOR THE MONTH AVERAGED NEAR TO ABOVE NORMAL.

AT ABILENE REGIONAL AIRPORT...THE AVERAGE TEMPERATURE FOR MAY WAS
72.8 DEGREES. THIS AVERAGE WAS EQUAL TO THE NORMAL AVERAGE
TEMPERATURE OF 72.8 DEGREES. TOTAL PRECIPITATION FOR MAY WAS 3.60
INCHES. THIS WAS 0.77 INCHES ABOVE THE MONTHLY NORMAL OF 2.83
INCHES.

AT SAN ANGELO REGIONAL AIRPORT...THE AVERAGE TEMPERATURE FOR MAY
WAS 75.9 DEGREES. THIS WAS 2.8 DEGREES ABOVE THE NORMAL AVERAGE
TEMPERATURE OF 73.1 DEGREES. TOTAL PRECIPITATION FOR MAY WAS 1.42
INCHES. THIS WAS 1.67 INCHES BELOW THE MONTHLY NORMAL OF 3.09
INCHES.

MAY 2010 WEATHER HIGHLIGHTS...

SCATTERED SHOWERS AND THUNDERSTORMS OCCURRED ON THE 1ST...
AS A COUPLE OF DISTURBANCES LIFTED NORTHEAST INTO WEST TEXAS.
STRONGER THUNDERSTORMS WITH SMALL HAIL OCCURRED ACROSS CENTRAL
AND SOUTHEASTERN PARTS OF WEST CENTRAL TEXAS DURING THE PRE-
DAWN AND EARLY MORNING HOURS. RAINFALL AMOUNTS MOSTLY VARIED
UNDER ONE HALF INCH...BUT A FEW LOCATIONS SOUTHEAST OF A
SONORA TO SAN SABA LINE RECEIVED BETWEEN ONE HALF AND ONE INCH. 

SCATTERED SHOWERS AND THUNDERSTORMS OCCURRED ON THE 3RD ACROSS
NORTHERN AND CENTRAL SECTIONS OF WEST CENTRAL TEXAS...AS AN
UPPER LEVEL DISTURBANCE MOVED EAST INTO THE REGION. A FEW OF
THE STORMS CONTAINED SMALL HAIL. RAINFALL AMOUNTS VARIED MOSTLY
UNDER ONE HALF INCH.

DRY AND HOTTER TEMPERATURES OCCURRED ON THE 4TH THROUGH 6TH...
WHEN HIGHS WERE IN THE 90S ACROSS MOST OF WEST CENTRAL TEXAS.

TEMPERATURES WERE COOLER FOLLOWING A DRY COLD FRONTAL PASSAGE
ON THE 7TH. WITH THE COMBINATION OF A COOLER AIRMASS AND
CONSIDERABLE CLOUD COVER ON THE 8TH...TEMPERATURES WERE
CONFINED TO THE MID 60S TO MID 70S FOR HIGHS ACROSS NEARLY ALL
OF WEST CENTRAL TEXAS.

HOTTER TEMPERATURES RETURNED ON THE 10TH...AFTER PASSAGE OF A
WARM FRONT. WITH THE APPROACH OF AN UPPER LEVEL DISTURBANCE AND
DRYLINE...INTO A VERY UNSTABLE AIRMASS...A FEW STRONG TO SEVERE
STORMS OCCURRED ACROSS THE BIG COUNTRY ON THE LATE EVENING OF
THE 10TH. THESE STORMS OCCURRED MAINLY EAST OF HIGHWAY 277. ONE
STORM PRODUCED QUARTER SIZE HAIL IN CALLAHAN COUNTY.

WITH THE APPROACH OF AN UPPER LEVEL DISTURBANCE...A BAND OF
SHOWERS AND THUNDERSTORMS MOVE EAST ACROSS PARTS OF THE BIG
COUNTRY DURING THE POST-MIDNIGHT AND PRE-DAWN HOURS OF THE 13TH.
A FEW LOCATIONS ACROSS THE BIG COUNTRY RECEIVED AMOUNTS BETWEEN
ONE HALF AND ONE INCH.

A COLD FRONT SAGGED SOUTH INTO WEST CENTRAL TEXAS ON THE 13TH
AND REMAINED STATIONARY UNTIL THE 14TH. WITH THE APPROACH AND
ARRIVAL OF THIS FRONT...A BAND OF THUNDERSTORMS WITH VERY HEAVY
RAINFALL OCCURRED ACROSS THE BIG COUNTRY AND NORTHERN CONCHO
VALLEY ON THE MORNING OF THE 13TH. THE HEAVIEST RAINFALL ALONG
THIS BAND OCCURRED FROM JUST EAST OF ABILENE TO JUST SOUTH OF
ROBERT LEE...AND RANGED FROM 1.5 TO 3 INCHES. SMALL HAIL
OCCURRED WITH A FEW OF THESE STORMS.  

ON THE 14TH...THE APPROACH OF AN UPPER LEVEL DISTURBANCE...
THE PRESENCE OF THE FRONTAL BOUNDARY ACROSS CENTRAL SECTIONS OF
THE AREA...AND AN UNSTABLE AIRMASS RESULTED IN THE DEVELOPMENT
OF NUMEROUS THUNDERSTORMS. SEVERAL OF THE STORMS PRODUCED DIME
TO NICKEL SIZE HAIL ACROSS THE CONCHO VALLEY. THE LARGEST HAIL
REPORTED WAS PING-PONG SIZE...TWO MILES NORTH OF ORIENT IN TOM
GREEN COUNTY. DURING THE LATE EVENING AND EARLY NIGHTTIME
HOURS...AN AREA OF STRONG THUNDERSTORMS MOVED SOUTHEAST FROM THE
CONCHO VALLEY ACROSS THE HEARTLAND...NORTHERN EDWARDS PLATEAU AND
INTO THE NORTHWEST HILL COUNTRY. BEHIND THE STORMS...STRONG EAST
WINDS DEVELOPED OVER THE CONCHO VALLEY...AND A PEAK WIND GUST OF
58 MPH WAS RECORDED AT SAN ANGELO. A WIDESPREAD AREA OF SHOWERS
AND THUNDERSTORMS ALSO LINGERED ACROSS THE NORTHERN HALF OF WEST
CENTRAL TEXAS.

RAINFALL AMOUNTS FROM THE 14TH (7 AM) TO THE 15TH (7 AM) WERE
MORE THAN ONE HALF INCH ACROSS A WIDESPREAD AREA OF WEST CENTRAL
TEXAS. OVER 3 INCHES OCCURRED IN NORTHERN STERLING COUNTY.
SCATTERED LOCATIONS ACROSS THE BIG COUNTRY...AND ALONG A BAND
THROUGH THE NORTHERNERN HEARTLAND AND NORTHERN CONCHO VALLEY...
RECEIVED BETWEEN 1.5 AND 3 INCHES.

WITH A MOIST AIRMASS AND A LEFTOVER BOUNDARY...ADDITIONAL
SHOWERS AND THUNDERSTORMS OCCURRED ACROSS PARTS OF WEST CENTRAL
TEXAS ON THE 15TH. THE HEAVIER RAINFALL OCCURRED ACROSS THE
SOUTHERN BIG COUNTRY...NORTHERN CONCHO VALLEY AND NORTHERN
HEARTLAND...WHERE SCATTERED LOCATIONS RECEIVED BETWEEN 1 AND
2.5 INCHES. OTHER SCATTERED LOCATIONS BETWEEN SAN ANGELO AND
MASON RECEIVED 1 TO 2 INCH AMOUNTS. ON THE EVENING OF THE 15TH...
WIND DAMAGE WAS REPORTED FROM A SEVERE STORM IN MASON...ALONG
WITH NICKEL SIZE HAIL. A FUNNEL CLOUD WAS REPORTED 15 MILES
NORTHWEST OF MASON.

A SEVERE WEATHER EVENT OCCURRED ON THE AFTERNOON AND EVENING OF
THE 17TH. WITH A NORTHWEST FLOW ALOFT...STRONG TO SEVERE
THUNDERSTORMS DEVELOPED OVER THE BIG COUNTRY...AND THEN
CONTINUED TO MOVE AND DEVELOP FARTHER TO THE SOUTH AND EAST
ACROSS WEST CENTRAL TEXAS. THE STORMS CONTAINED STRONG WINDS
AND HEAVY RAIN. PEAK WIND GUSTS REACHED 64 MPH AT ABILENE
REGIONAL AIRPORT...60 MPH AT DYESS AIR FORCE BASE...52 MPH AT
JUNCTION...AND 40 MPH AT SAN ANGELO REGIONAL AIRPORT. A COUPLE
OF REPORTS OF WIND DAMAGE TO TREES WERE RECEIVED FROM THE BIG
COUNTRY. IN TOM GREEN COUNTY...WIND DAMAGE OCCURRED AT GRAPE
CREEK...IN THE TOWN OF WALL...AND 12 MILES EAST OF SAN ANGELO.
IN ADDITION...VERY HEAVY RAINFALL FLOODED A ROAD 3 MILES NORTH-
NORTHEAST OF WALL...IN TOM GREEN COUNTY.

THE HEAVIEST RAIN OCCURRED IN BANDS...EXTENDING FROM ASPERMONT
TO ABILENE TO CISCO...AND FROM BIG SPRING TO SAN ANGELO TO
BETWEEN JUNCTION AND MASON. RAINFALL AMOUNTS RANGED MOSTLY
FROM ONE HALF TO 1.5 INCHES ALONG THESE BANDS...THOUGH SOME
LOCATIONS ACROSS KIMBLE AND MASON COUNTIES RECEIVED BETWEEN
1.5 AND 2.5 INCHES.

SCATTERED STRONG TO SEVERE STORMS IN EAST-CENTRAL COUNTIES ON
THE EVENING OF THE 20TH.

AS A WEAK COLD FRONT MOVED SOUTH INTO CENTRAL SECTIONS OF WEST
CENTRAL TEXAS INTO AN UNSTABLE AIRMASS...SCATTERED STRONG
THUNDERSTORMS OCCURRED ON THE EVENING AND EARLY NIGHTTIME OF
THE 20TH. THE STORMS OCCURRED ACROSS THE HEARTLAND AND EASTERN
CONCHO VALLEY. DIME TO NICKEL SIZE HAIL WAS REPORTED IN
BROWNWOOD. HAIL TO DIME SIZE WAS REPORTED NEAR PEAR VALLEY
(MCCULLOUGH COUNTY). SOME LOCATIONS ACROSS NORTHERN MCCULLOCH...
SOUTHERN BROWN...AND EXTREME SOUTHERN COLEMAN COUNTIES RECEIVED
BETWEEN ONE HALF AND ONE INCH OF RAIN.

WITH A SOUTHEAST TO SOUTH LOW-LEVEL FLOW INTO THE REGION ON
THE 21ST TO 23RD...WARM AND HUMID CONDITIONS OCCURRED.

A FLOODING EVENT OCCURRED IN MASON COUNTY LATE IN THE MONTH.
WITH A VERY MOIST AIRMASS OVER THE REGION...SCATTERED SHOWERS
AND THUNDERSTORMS WITH LOCALIZED VERY HEAVY RAINFALL OCCURRED
FROM THE LATE AFTERNOON TO THE NIGHTTIME HOURS OF THE 24TH.  
THESE WERE MOST CONCENTRATED ACROSS MASON...SOUTHERN
MCCULLOCH...AND SOUTHWESTERN SAN SABA COUNTIES. RAINFALL AMOUNTS
RANGED FROM 4 TO 7 INCHES ACROSS THIS AREA. THIS CAUSED FLASH
FLOODING OF STREETS IN THE TOWN OF MASON...AND NECESSITATED
THE CLOSURE OF OTHER ROADS IN MASON COUNTY. IN ADDITION...A
COUPLE OF HIGH WATER RESCUES WERE REPORTED. IN MCCULLOCH COUNTY
A BRIDGE WAS DAMAGED AND IMPASSABLE 4 MILES SOUTH-SOUTHWEST OF
VOCA...ALONG COUNTY ROAD 216.

VERY HEAVY RAINFALL ALSO OCCURRED ACROSS PARTS OF NORTHERN
EDWARDS COUNTY...IN THE UPPER PART OF THE DRAINAGE BASIN OF THE
SOUTH LLANO RIVER. LOCALIZED RAINFALL AMOUNTS RANGED FROM 6 TO
10 INCHES ACROSS THAT AREA. THIS LED TO RAPID WATER RISES ALONG
THE SOUTH LLANO RIVER ON THE MORNING OF THE 25TH. AT TELEGRAPH
(KIMBLE COUNTY)...THE WATER LEVEL ROSE 15 FEET IN A 2-HOUR TIME
PERIOD. A LOW WATER CROSSING 7 MILES SOUTH OF JUNCTION WAS ALSO
FLOODED. THE LLANO RIVER NEAR MASON ROSE ABOVE BANKFULL ON THE
MORNING OF THE 26TH.

SCATTERED SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN OCCURRED
ON THE 25TH...MAINLY DURING THE AFTERNOON AND EVENING HOURS.
THESE OCCURRED MOSTLY EAST OF A LINE FROM THROCKMORTON TO
ABILENE TO SAN ANGELO TO OZONA. THE HEAVIER AMOUNTS RANGED FROM
1.5 TO 3 INCHES...WITH LOCALLY HIGHER TOTALS IN WESTERN SAN SABA
COUNTY.

ON THE 26TH...SCATTERED SHOWERS AND THUNDERSTORMS OCCURRED
ACROSS THE NORTHERN HALF OF WEST CENTRAL TEXAS DURING THE
EVENING AND EARLY NIGHTTIME HOURS. PARTS OF FISHER...TAYLOR...
AND NORTHERN RUNNELS COUNTIES RECEIVED BETWEEN 1 AND 2 INCHES
OF RAIN.

DURING THE LAST SEVERAL DAYS OF THE MONTH AND THE MEMORIAL
DAY HOLIDAY WEEKEND...WARM AND DRY CONDITIONS OCCURRED WITH THE
INFLUENCE OF A HIGH PRESSURE SYSTEM ALOFT. 

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