Flash Flood Warning 24, NWS Las Vegas, NV

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
245 PM PDT SUN JUL 11 1999

SYNOPSIS...A VERY MOIST AND UNSTABLE AIR MASS WILL REMAIN OVER THE
REGION THROUGH TUESDAY. THIS WILL RESULT IN A CONTINUED THREAT FOR
MAINLY AFTERNOON SHOWERS AND THUNDERSTORMS. DAYTIME TEMPERATURES WILL
REMAIN BELOW NORMAL.

DISCUSSION...WILL KEEP FLASH FLOOD WATCH GOING AS PLENTY OF ACTIVITY
WITH HEAVY RAIN AND AT LEAST ONE WARNING THIS AFTERNOON OVER
NORTHWEST AZ AND SAN BERNARDINO COUNTY. NOTHING GOING IN CLARK AND
SOUTHERN NYE COUNTIES YET BUT WITH HIGH PRECIPITABLE WATER AND SOME
SUNSHINE STILL...EXPECT THUNDERSTORMS TO POP EVENTUALLY OR TO ADVECT
IN. MORE CAPPED AND A LITTLE MORE STABLE OVER NORTHERN NY AND LINCOLN
COUNTY AND WILL DROP POPS THERE DOWN TO SLIGHT CHANCE THIS EVENING.
SATELLITE EARLIER THIS AFTERNOON SHOWED TWO SEPERATE VORT MAXES...ONE
IN SOUTHWEST AZ AND ANOTHER MOVING NW INTO NW AZ. THIS SECOND VORT
MAX WILL KEEP SOME ACTIVITY GOING PAST THE EVENING HOURS IN SOME
LOCATIONS AND WILL WORD FORECAST AS SUCH. NO MAJOR CHANGE IN AIRMASS
OR WIND FLOW THROUGH TUESDAY SO WILL CONTINUE PERSISTENCE FORECAST
WITH GENERALLY SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS.
AM HESITANT TO FLUSH MOISTURE OUT OF CWA IN EXTENDED EVEN THOUGH
MODELS HINTING AT MORE SOUTHWESTERLY FLOW DEVELOPING. TOUGH TO GET
THAT TO HAPPEN THIS TIME OF YEAR AND BELIEVE IT WOULD BE WISE TO KEEP
THE CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS GOING.

.LAS...A FLASH FLOOD WATCH CONTINUES FOR NW AZ AND PORTIONS OF SRN NV
       AND ERN CA DESERTS UNTIL 9 PM PDT (04Z). REFER TO THE FLASH
       FLOOD WATCH STATEMENT FOR DETAILS.