Flash Flood Warning 40, NWS Phoenix, AZ

AZZALL-120230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
440 PM MST SAT AUG 11 1990

AT 430 PM THUNDERSTORMS WERE CONTINUING TO DEVELOP ACROSS ARIZONA. THE
STRONGEST THUNDERSTORMS WERE LOCATED ACROSS PIMA COUNTY...IN A LARGE
BAND STRETCHING ACROSS CENTRAL ARIZONA FROM NEAR BLYTHE CALIFORNIA EAST
TO THE WHITE MOUNTAINS...AND NEAR THE GRAND CANYON.

MOVEMENT OF THE THUNDERSTORMS OVER PIMA COUNTY WAS TOWARD THE WEST AND
NORTH...WHILE THOSE ACROSS CENTRAL ARIZONA WERE SLOWLY MOVING TOWARD
THE SOUTH.

AT THE PRESENT TIME NO THUNDERSTORMS WERE NOTED NEAR PHOENIX...BUT
MOVEMENT OF STORMS TOWARD THE CITY FROM BOTH THE SOUTH AND NORTH
STRONGLY SUGGEST THE POSSIBILITY OF THUNDERSTORMS IN THE GREATER
PHOENIX AREA IN ANOTHER HOUR OR TWO. IN FACT AT 430 PM A DUST STORM
WAS REPORTED MOVING NORTH THROUGH CASA GRANDE.
>
A FEW OF THE THUNDERSTORMS LATE THIS AFTERNOON AND EVENING WILL CONTINUE
TO CAUSE STRONG GUSTY WINDS...WITH BRIEF PERIODS OF VERY HEAVY RAIN.
ALSO...THERE HAVE BEEN REPORTS OF HAIL FROM A FEW OF THIS AFTERNOONS
THUNDERSTORMS...AND THIS THREAT WILL REMAIN THROUGH THE EVENING HOURS.

MOTORISTS AND PEOPLE OUTDOORS THIS AFTERNOON AND EVENING WILL NEED TO
USE CAUTION AND WATCH FOR RAPIDLY CHANGING WEATHER CONDITIONS...
LEADING TO FLASH FLOODING OF WASHES...NORMALLY DRY CREEKS...AND ROADWAY
DIPS. IN ADDITION...MOTORISTS DRIVING IN DESERT AREAS WILL NEED TO
WATCH FOR BLOWING DUST...POSSIBLY RESULTING IN NEAR ZERO VISIBILITY._

JP 112340Z

AZZALL-120230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
540 PM MST SAT AUG 11 1990

AT 530 PM LOCALLY STRONG THUNDERSTORMS WERE PRESENT AT A NUMBER OF
LOCATIONS. THE MAJORITY OF THE ACTION HAS SHIFTED TO THE SOUTHWEST
THIRD OF THE STATE BUT THUNDERSTORMS WERE STILL PRESENT NEAR PAYSON
...AND JUST EAST OF ALPINE. ELSEWHERE ACROSS NORTHERN AND EASTERN
ARIZONA THUNDERSTORM ACTIVITY WAS ON THE DECREASE AT 530 PM.

OF PARTICULAR NOTE WERE STRONG THUNDERSTORMS OVER WESTERN MARICOPA
AND EASTERN YUMA COUNTIES. STORMS IN THIS AREA HAVE PRODUCED STRONG
GUSTY WINDS AND HEAVY RAIN...IN ADDITION TO DUST STORMS.

MOTORISTS...HIKERS...AND CAMPERS WILL NEED TO WATCH WEATHER CONDITIONS
CAREFULLY THE NEXT FEW HOURS DUE TO THUNDERSTORMS. WASHES...NORMALLY
DRY CREEKS...AND ROADWAY DIPS COULD QUICKLY BECOME FILLED WITH WATER
...AND IN DESERT AREAS VISIBILITY COULD RAPIDLY BE REDUCED TO NEAR
ZERO DUE TO BLOWING DUST.
JP 120040Z

AZZ007 120100

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YUMA AZ
545 PM MST SAT AUG 11 1990

  ...THUNDERSTORMS WERE BUILDING OVER YUMA COUNTY LATE THIS AFTERNOON...

RADAR AT THE AEROSTAT BALLOON SITE...IN WESTCENTRAL YUMA COUNTY...
INDICATED A NEARBY STRONG THUNDERSTORM OVER CASTLE DOME. OTHER STORMS
WERE DEVELOPING OVER THE COPPER AND MOHAWK MOUNTAINS JUST SOUTH OF
INTERSTATE 8.

THESE STORMS ARE A THREAT TO MOTORISTS ON INTERSTATE 8 AND HIGHWAY 95.
HEAVY SHOWERS AND STRONG WINDS ARE EXPECTED FROM THE STORMS...WITH GUSTS
AROUND 50 MPH CAUSING BLOWING DUST AND REDUCED VISIBILITIES. MOTORISTS
ARE URGED TO DRIVE WITH CAUTION. IF CAUGHT IN A DUST STORM...PULL TO
THE SIDE OF THE ROAD AND PARK...WITH BRAKE LIGHTS OFF.

MORE THUNDERSTORM DEVELPMENT IS EXPECTED INTO THE EARLY EVENING...WITH
DECREASING ACTIVITY LATER TONIGHT.
.
MATHESON

AZZALL-120130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
545 PM MST SAT AUG 11 1990

AT 540 PM A DUST STORM WAS REPORTED IN PROGRESS IN THE TEMPE AREA...
MOVING TOWARD THE NORTH. WINDS WITH THE STORM WERE ESTIMATED BETWEEN
25 AND 35 MPH...AND VISILITY TO BETWEEN ONE QUARTER AND A HALF MILE.

THIS DUST STORM WILL MOVE THROUGH THE EAST AND CENRAL PORTIONS OF THE
PHOENIX AREA...SLOWLY DECREASING ITS INTENSITY...DURING THE NEXT HOUR.

JP 120045Z

AZZALL-120300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
705 PM MST SAT AUG 11 1990

AT 7 PM WEATHER RADAR SHOWED DEVELOPING THUNDERSTORMS IN THE GLENDALE
AREA. THESE STORMS HAVE THE POTENTIAL FOR HEAVY RAION AS WELL AS STRONG
WINDS.

MOVEMENT OF THE THUNDERSTORMS WAS UNKNOWN...BUT THEY MAY BUILD BACK
TOWARD PHOENIX. FLOODING OF SOME ROADS IN THE NORTHWEST PORTION OF THE
VALLEY WILL PROBABLY TAKE PLACE. THUS MOTORISTS WIL!L NEED TO USE
CAUTION FOR THE NEXT HOUR OR TWO.

JP 120205Z