Severe Thunderstorm Warning 73, NWS Tucson, AZ

000 
WWUS55 KTWC 240224
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
720 PM MST THU AUG 23 2007

AZC009-240230-
/O.CON.KTWC.SV.W.0073.000000T0000Z-070824T0230Z/
GRAHAM AZ-
720 PM MST THU AUG 23 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MST
FOR CENTRAL GRAHAM COUNTY...

AT 720 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS PRODUCING VERY HEAVY RAIN AND SMALL HAIL FROM SAFFORD 
SOUTHWESTWARD TO THE VICINITY OF MOUNT GRAHAM. MOVEMENT OF THIS 
COMPLEX OF THUNDERSTORMS WAS NEARLY STATIONARY. AT 705 PM MST...A 
TRAINED WEATHER SPOTTER REPORTED ONE HALF INCH DIAMETER HAIL ABOUT 2 
MILES WEST OF THE SAFFORD AGRICULTURAL STATION.

THE SEVERE THUNDERSTORM WILL ALSO IMPACT HIGHWAY 191 MAINLY SOUTH OF 
SAFFORD...INCLUDING CACTUS FLAT...SWIFT TRAIL JUNCTION AND ARTESIA.

LAT...LON 3269 10989 3264 10975 3271 10959 3283 10956
      3294 10958 3296 10971 3292 10985

$$

000 
WWUS55 KTWC 240238
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
735 PM MST THU AUG 23 2007

AZC009-240245-
/O.EXP.KTWC.SV.W.0073.000000T0000Z-070824T0230Z/
GRAHAM AZ-
735 PM MST THU AUG 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL GRAHAM COUNTY EXPIRED
AT 730 PM MST...

AT 730 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THUNDERSTORMS WERE WEAKENING ACROSS CENTRAL GRAHAM COUNTY. THUS 
THE SEVERE THUNDERSTORM WARNING ISSUED EARLIER WAS ALLOWED TO EXPIRE 
AT 730 PM MST.

AT 720 PM MST...THE GRAHAM COUNTY SHERIFF OFFICE IN SAFFORD REPORTED 
THAT DEBRIS COVERED MUCH OF HIGHWAY 191 FROM SAFFORD SOUTH TO 
ARTESIA DUE TO THUNDERSTORM WINDS.

LAT...LON 3269 10989 3264 10975 3271 10959 3283 10956
      3294 10958 3296 10971 3292 10985

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
200 PM MST THU AUG 23 2007

.SYNOPSIS...AN WEAKENING EASTERLY IMPULSE MOVING INTO THE REGION
WILL ENHANCE THUNDERSTORM DEVELOPMENT A LITTLE FURTHER THIS
AFTERNOON AND EVENING. EXPECT AN INCREASING MOISTURE TREND ALONG
WITH A LESS STABLE SOUTHERLY FLOW OVER THE WEEKEND...BRINGING A MUCH
BETTER CHANCE OF SHOWERS AND THUNDERSTORMS.

&&

.DISCUSSION...AS EXPECTED THE SHEARING INVERTED TROUGH CREATED A
NICE DEFORMATION ZONE ACROSS EASTERN SONORA INTO FAR SOUTHEAST
ARIZONA AND INTO SOUTHWEST NEW MEXICO...WITH A FEW AREAS NEAR TO
SOUTH AND EAST OF DOUGLAS RECEIVING SIGNIFICANT RAINFALL LAST NIGHT.
THIS ZONE HAS DRIFTED A LITTLE FURTHER WEST AND NORTHWEST
TODAY...PROBABLY PUTTING THE NOGALES TO SIERRA VISTA AREA WITH OUR
BEST CHANCE AT SHOWERS AND THUNDERSTORMS LATER THIS AFTERNOON AND
EVENING. THE 12Z KTWC SOUNDING IS OTHERWISE SIMILAR TO YESTERDAY...A
LITTLE MORE MOISTURE AND WEAK SHEAR...SOME CONVECTION FRIENDLY
COOLING FROM H5 TO H6...BUT WARMING JUST ABOVE THIS CREATING ANOTHER
SUBSIDENCE INVERSION TO CONTEND WITH. STILL A TOUCH WARM EVEN AT
H5...SO OTHER THAN THE AFORE MENTIONED INFLUENCE FROM THE WEAK
DEFORMATION ZONE...STORMS ARE HAVING SOME INITIAL DIFFICULTIES
WANDERING OFF AFTER DEVELOPMENT OVER MOUNTAINS SO FAR THIS
AFTERNOON. EXPECT THAT TO CHANGE LATER IN THE DAY WITH SOME STORMS
SUPPORTED OVER VALLEY LOCATIONS...ESPECIALLY SOUTH AND SOUTHEAST OF
TUCSON.

DEAN QUICKLY TORE THROUGH CENTRAL MEXICO AND DIED...WITH A REMNANT
MID LEVEL CIRCULATION AND LOTS OF MOISTURE PUSHING INTO THE PACIFIC
SOUTH OF THE GULF OF CALIFORNIA AS EXPECTED. TROUGH DEVELOPING
ACROSS HIGH AND MID TIER WESTERN STATES WITH THE HIGH CENTER
RECONSOLIDATING TOWARD SOUTHEASTERN STATES. AS THE RIDGE BUILDS BACK
WESTWARD THE MID AND UPPER LEVEL BITS AND PIECES LEFT OVER FROM THE
STORM REMNANTS WILL LIKELY SPREAD FURTHER WESTWARD OUT TOWARD THE
PACIFIC WITH A FEW POSSIBLY RIDING THE PERIPHERY OF THE RIDGE IN OUR
GENERAL DIRECTION. COMBINED WITH THE SUBSEQUENT MOISTURE
ENHANCEMENT...SATURDAY AND SUNDAY SHOULD BE QUITE A BIT MORE ACTIVE
ACROSS SOUTHCENTRAL AND SOUTHEAST ARIZONA THAN RECENT WEEKS.

WITH BETTER STORM COVERAGE AFTERNOON HIGHS ARE EXPECTED TO FALL BACK
TO NEAR OR BELOW CLIMO OVER THE WEEKEND AS WELL.

&&

.AVIATION...ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS
EVENING EAST OF A LINE FROM KTUS TO KSOW. THIS THUNDERSTORM ACTIVITY
IS EXPECTED TO MOVE SLOWLY WESTWARD ON FRIDAY WITH A CHANCE OF
THUNDERSTORMS ACROSS ALL OF SOUTHEAST ARIZONA BY SATURDAY.
VISIBILITIES NEAR THESE THUNDERSTORMS WILL BE 2-4 SM WITH BKN050 AGL
CEILINGS. AVIATION DISCUSSION NOT UPDATED FOR TAF AND TWEB
AMENDMENTS.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...NONE.

WEATHER.GOV/TUCSON