Severe Thunderstorm Warning 23, NWS Las Vegas, NV

313 
WWUS55 KVEF 222251
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
351 PM PDT MON JUL 22 2013

CAC071-222315-
/O.CON.KVEF.SV.W.0023.000000T0000Z-130722T2315Z/
SAN BERNARDINO CA-
351 PM PDT MON JUL 22 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT
FOR CENTRAL SAN BERNARDINO COUNTY...

AT 348 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING UP TO QUARTER 
SIZE HAIL AND DAMAGING WINDS NEAR 60 MPH. THIS STORM WAS LOCATED 
NEAR BARSTOW-CALICO KOA CAMPGROUND...OR NEAR DAGGETT...AND WAS 
MOVING NORTHWEST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
BARSTOW-CALICO KOA CAMPGROUND.

THIS INCLUDES INTERSTATE 15 BETWEEN MILE MARKERS 81 AND 92.

LAT...LON 3486 11677 3491 11700 3508 11692 3495 11670
      3485 11677
TIME...MOT...LOC 2251Z 119DEG 5KT 3491 11684

$$

STACHELSKI

444 
WWUS55 KVEF 222313
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
413 PM PDT MON JUL 22 2013

CAC071-222323-
/O.EXP.KVEF.SV.W.0023.000000T0000Z-130722T2315Z/
SAN BERNARDINO CA-
413 PM PDT MON JUL 22 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 415 PM PDT...

THIS INCLUDES INTERSTATE 15 BETWEEN MILE MARKERS 81 AND 92.

THE THUNDERSTORM IN BARSTOW HAS WEAKENED ALTOGETHER. 

LAT...LON 3486 11677 3491 11700 3508 11692 3495 11670
      3485 11677
TIME...MOT...LOC 2313Z 119DEG 5KT 3492 11687

$$

STACHELSKI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1005 AM PDT MON JUL 22 2013

.SYNOPSIS...A MOIST SOUTHEASTERLY FLOW WILL CONTINUE TO ENHANCE
MONSOONAL MOISTURE TODAY...PROVIDING ADDITIONAL FUEL FOR
THUNDERSTORMS AND THE THREAT OF FLASH FLOODING. MORE ORGANIZED STORM
CELLS COULD PRODUCE ISOLATED SEVERE WINDS IN SOME AREAS.
THUNDERSTORM COVERAGE WILL DECREASE MID TO LATE WEEK AS SOME DRYING
TAKES PLACE...ESPECIALLY OVER THE SOUTHWESTERN REGION OF THE
FORECAST AREA. AN INCREASE IN STORMS COULD OCCUR AGAIN NEXT WEEKEND.
&&

.UPDATE...THE CIRCULATION ROTATING UP THROUGH CENTRAL CALIFORNIA
SHOULD PROVIDE DYNAMIC SUPPORT FOR CONVECTION OVER MUCH OF INYO
COUNTY CALIFORNIA AND NEARBY ESMERALDA/CENTRAL NYE COUNTIES IN
NEVADA. THE FLASH FLOOD WATCH WAS EXPANDED TO INCLUDE THESE ZONES
AND THE ENTIRE FORECAST AREA IS NOW UNDER A WATCH THROUGH 11 PM THIS
EVENING. THE 12Z LAS VEGAS SOUNDING SHOWED A PWAT VALUE OF 1.62
INCHES AND CONSIDERABLE DESTABILIZATION DURING THE PAST 12 HOURS
WITH ONLY A WEAK CAP JUST ABOVE 700 MB. STEERING FLOW WILL BE TOWARD
THE WEST OVER THE NORTHERN HALF OF THE AREA AND TO THE NORTHWEST
OVER THE SOUTHERN HALF. A BROAD BAND OF CLOUDS ACROSS MOHAVE AND
CLARK COUNTIES SHOULD SUPPRESS HEATING BUT IT WILL NOT TAKE MUCH TO
GET CONVECTION FIRING OVER THE MOUNTAINS. ANY OUTFLOW BOUNDARY
INTERACTION THAT COMES INTO PLAY COULD KEEP CONVECTION GOING WELL
INTO THIS EVENING. NEED TO KEEP AN EYE ON OUR ZONES NEAR CENTRAL
NEVADA LATE THIS EVENING AND OVERNIGHT AS THE LATEST HIGH RES MODELS
INDICATE EXTENSIVE ORGANIZED CONVECTION MOVING EAST TO WEST IN THE
CONVERGENCE ZONE ACROSS THAT AREA.
&&

.PREV DISCUSSION...
255 AM PDT MON JUL 22 2013

.SHORT TERM...THROUGH TUESDAY NIGHT...WATER VAPOR IMAGERY SHOWS AN
UPPER LEVEL IMPULSE ROTATING NORTHWARD OFF THE SOUTHERN CALIFORNIA
COAST THIS MORNING WITH DRY AIR WRAPPING AROUND THE EAST/NORTHEAST
SIDE OF IT. THERE IS NEARLY TWO INCH SATELLITE DERIVED PWAT VALUES
WITHIN THE AREA UNDER THIS DRY SLOT OVER SOUTHERN SAN BERNARDINO
COUNTY...SUGGESTING DEEP LAYER MOISTURE IN THE LOW TO MID LEVELS.
THE ONE INCH PWAT LINE ACCORDING TO THIS SAME SATELLITE PRODUCT
EXTENDS ALMOST ENTIRELY THROUGH THE FORECAST AREA. DESPITE THE
MOISTURE LADEN AIRMASS AND A TRIGGERING MECHANISM NEARBY...THE ONLY
ACTION IN TOWN CURRENTLY IS SCATTERED THUNDERSTORMS IN SOUTHERN
MOHAVE COUNTY. THIS WILL LIKELY CHANGE AFTER SUNRISE AND DAYTIME
HEATING IS ADDED TO THE EQUATION.

THE CIRCULATION ALONG THE SO CAL COAST IS FORECAST TO CONTINUE NORTH
THROUGH THE DAY PROVIDING SUPPORT FOR STORM DEVELOPMENT AND POSSIBLY
ENHANCING IT OVER THE WESTERN PORTIONS OF THE CWA. WILL NEED TO
WATCH THIS CLOSE TO SEE IF THE REMAINING WESTERN ZONES NEED TO BE
ADDED TO THE WATCH. HIGH PRESSURE OVER NORTHERN CALIFORNIA SHIFTS
EAST TO NORTHERN NEVADA TODAY PUTTING AN END TO SEVERAL DAYS OF A
NORTHEAST STEERING FLOW INTO THE LAS VEGAS VALLEY AND TURNING THE
FLOW SOUTHERLY INSTEAD. THUS WILL NEED TO START LOOKING TO THE SOUTH
THIS AFTERNOON FOR STORM DEVELOPMENT AND ASSOCIATED OUTFLOW
BOUNDARIES. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MOST OF THE
AREA TODAY BASED ON THE FACT THAT ANY STORM THAT FORMS IN THIS MOIST
AND UNSTABLE ATMOSPHERE WILL HAVE THE POTENTIAL TO UNLOAD VERY HEAVY
RAIN IN A SHORT PERIOD OF TIME.

MOIST...UNSTABLE CONDITIONS REMAIN ACROSS MUCH OF THE AREA TUESDAY
HOWEVER...NO APPARENT TRIGGER IS FORECAST BY THE MODELS AND THE FLOW
BECOMES A LITTLE LESS FAVORABLE FOR WIDESPREAD CONVECTION. BASED ON
THIS...WILL NOT EXTEND THE WATCH INTO TUESDAY AT THIS TIME.

BELOW NORMAL TEMPS CONTINUE TODAY AND MONDAY BUT HOW FAR BELOW WILL
DEPEND ON HOW MUCH CLEARING THERE IS.

.LONG TERM...WEDNESDAY THROUGH SUNDAY...MODELS STILL INDICATING THAT
WE SHOULD SEE A DECREASE IN THE COVERAGE OF THUNDERSTORMS WEDNESDAY
THROUGH FRIDAY WITH RAINFALL RATES FOR STORMS COMING DOWN AS WELL.
THE NEXT INFLUX OF MOISTURE RETURNS TO CLARK...LINCOLN...ERN SAN
BERNARDINO AND MOHAVE COUNTIES OVER THE WEEKEND. AN UPPER LEVEL
DISTURBANCE APPROACHING FROM THE WEST AND ENTRANCE REGION OF
JETSTREAM OVER THE AREA MAY MAKE FOR ANOTHER INTERESTING WEEKEND.
MORE FAVORABLE SHEAR ENVIRONMENT WOULD LEAD TO BETTER ORGANIZED
THUNDERSTORMS. LOOKING PAST SUNDAY...MODELS IN GOOD AGREEMENT
SHOWING A STRONGER TROUGH ACROSS THE PAC NW WITH MONSOON MOISTURE
BEING SCOURED OUT OF SRN NV AND SE CA ON MONDAY...AND FROM NW AZ
TUESDAY. IF MODELS VERIFY...THIS FITS WELL WITH DOCUMENTED LAS VEGAS
MONSOON CLIMATOLOGY SHOWING A BREAK FROM MONSOON MOISTURE TYPICALLY
BETWEEN LATE JULY AND EARLY AUGUST. INHERITED TEMPERATURES LOOKED
FINE BUT DID MAKE SOME TWEAKS TO LOWER DWPTS LATE IN THE PERIOD.
&&

.AVIATION...FOR MCCARRAN...SOUTHERLY WINDS UP TO 10KTS TODAY WITH
FEW-SCT CLOUDS AROUND 10K FEET AND BKN CLOUDS AOA 14K FEET.
SCATTERED THUNDERSTORMS ARE EXPECTED TODAY WITH GUSTY...ERRATIC
WINDS AND HEAVY RAIN. STORMS ARE POSSIBLE IN ALL APPROACH CORRIDORS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS
MUCH OF THE AREA TODAY. WINDS WILL GENERALLY BE SOUTHERLY AT AROUND
10 KTS...BUT STRONGER AND ERRATIC NEAR THUNDERSTORMS. CIGS 8-10K
FEET WHERE STORMS DEVELOP OTHERWISE...AOA 14K FEET.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...FLASH FLOOD WATCH THROUGH THIS EVENING FOR NVZ014>022.
AZ...FLASH FLOOD WATCH THROUGH THIS EVENING FOR AZZ001>003-036.
CA...FLASH FLOOD WATCH THROUGH THIS EVENING FOR CAZ519>527.
&&

UPDATE...ADAIR
PREV DISCUSSION...SALMEN/PIERCE

FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:

HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
337 AM PDT MON JUL 22 2013

AZZ001>003-036-CAZ522>527-NVZ015>022-230515-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-DEATH VALLEY NATIONAL PARK-
WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN-
CADIZ BASIN-SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
LINCOLN COUNTY-NORTHEAST CLARK COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE-
SPRING MOUNTAINS-LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY-
337 AM PDT MON JUL 22 2013 /337 AM MST MON JUL 22 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
ARIZONA...CALIFORNIA AND SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH 10 PM THIS EVENING...

HEAVY RAIN FROM THUNDERSTORMS REMAINS THE PRIMARY CONCERN TODAY AND
THIS EVENING. NORMALLY DRY WASHES AND DRAINAGE CHANNELS MAY CONTAIN
FLOWING WATER AT TIMES. WATER FLOWING ACROSS ROADWAYS MAY MAKE THOSE
ROADS IMPASSABLE. BURN AREAS FROM RECENT FIRES WILL BE ESPECIALLY
PRONE TO FLASH FLOODING AND DEBRIS FLOW.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE AREAL COVERAGE OF THUNDERSTORMS WILL GRADUALLY DECREASE FROM
TUESDAY THROUGH FRIDAY. THE POTENTIAL OF HEAVY RAIN FROM STORMS WILL
DECREASE AS WELL. NEXT WEEKEND MAY BE ACTIVE AGAIN AS ANOTHER SURGE
OF MONSOON MOISTURE RETURNS TO CLARK...LINCOLN...MOHAVE AND EASTERN
SAN BERNARDINO COUNTIES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...
SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

CAZ519>521-NVZ014-230515-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
ESMERALDA AND CENTRAL NYE COUNTY-
337 AM PDT MON JUL 22 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA AND
SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL OCCUR TODAY AND TONIGHT. SOME STORMS
COULD PRODUCE STRONG WINDS AND HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE AREAL COVERAGE OF THUNDERSTORMS WILL GRADUALLY DECREASE FROM
TUESDAY THROUGH SUNDAY. THE POTENTIAL OF HEAVY RAIN FROM ANY STORM WILL
DECREASE AS WELL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...
SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.