732
AWUS01 KWNH 121946
FFGMPD
NVZ000-CAZ000-130130-
MESOSCALE PRECIPITATION DISCUSSION 1025
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
345 PM EDT WED AUG 12 2026
AREAS AFFECTED...CENTRAL & SOUTHERN NEVADA...EASTERN CENTRAL
CALIFORNIA...
CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE
VALID 121945Z - 130130Z
SUMMARY...SLOW MOVING CELLS NEAR DEVELOPING UPPER-LOW ALONG STEEP,
ROCKY TERRAIN CAPABLE OF .5-1"/HR WHICH MAY RESULT IN LOCALIZED
FLASH FLOODING CONDITIONS
DISCUSSION...GOES-W WV SUITE DEPICTS A COMPACT CLOSED LOW OVER THE
CENTRAL WEST COAST OF CALIFORNIA CONTINUING TO LIFT NORTHEASTWARD
INTO THE STATE WITH TYPICAL JET ENTRANCE ACROSS N CA DENOTED BY
TRANSVERSE BANDED HIGH CIRRUS FILAMENTS EXTENDING INTO THE CORE OF
THE 50-70KT 250MB JET ACROSS N NV INTO S ID. THE EFFECTIVE WARM
CONVEYOR TO THE CYCLONE IS EXTENDING ACROSS THE LOWER COLORADO
RIVER ANGLING BACK WESTWARD ACROSS THE NV GREAT BASIN INTO THE
SHARPENING TROWAL/DEFORMATION ZONE GENERALLY ALONG THE SOUTHERN
INTERFACE OF THE AFOREMENTIONED JET ENTRANCE REGION. DUE TO THE
CENTRAL SIERRA NEVADA, AN EFFECTIVE MID-LEVEL TRIPLE POINT
VORTICITY CENTER IS DEVELOPING ACROSS AND WEST OF THE SIERRA
NEVADA. CIRA LPW ALSO NOTES POOLED MOISTURE THROUGH THE CENTRAL
VALLEY IS ASCENDING UP AND OVER THE SLOPE OF THE TERRAIN AND
EVENTUALLY MOISTURE FEEDING ALONG THE EASTERN SLOPES OUT OF THE
COLORADO RIVER BASIN WILL MELD AND BRING OVERALL TOTAL PWATS FROM
THE .75" RANGE TOWARD 1 TO 1.2".
SOLID HEATING OVER THE CORE OF THE LOW TO MID-LEVEL MOISTURE PLUME
IS INCREASING INSTABILITY FROM 500 TOWARD 1000 J/KG SBCAPE IN THE
LAST FEW HOURS. PROXIMITY TO THE DEVELOPING VORTICITY CENTER,
CONVECTION HAS STARTED TO DEVELOP ACROSS MONO TO EASTERN
ALPINE/ELDORADO COUNTY CA. HOWEVER, DOWNSTREAM DIVERGENCE AND
WEAK DPVA INTO THE DEFORMATION ZONE ACROSS CENTRAL NV IS ALSO
ENHANCING MOUNTAIN CIRCULATION DEVELOPMENT ON MANY OF THE RIDGES
BUT LIKELY TO FURTHER EXPAND AS THE AFTERNOON PROGRESSES TOWARD
EVENING. CELLS WILL LIKELY REMAIN TERRAIN FOCUSED FOR A FEW
HOURS AND WITH SOLID ASCENT FROM THE DESTABILIZATION WILL ALLOW
FOR A FEW CYCLES TO MOISTEN THE LOWER PROFILES FOR .5"/HR RATES TO
INCREASE SLIGHTLY WITH THE INCREASING MOISTURE FROM THE SOUTH.
ISOLATED CELLS FURTHER SOUTH TOWARD SOUTHERN NV WILL HAVE DEEPER
MOISTURE AND MAY BE CAPABLE TO HAVE RATES UP TO 1"/HR. AS SUCH,
SCATTERED INCIDENTS OF LOCALIZED FLASH FLOODING WILL BE CONSIDERED
POSSIBLE THROUGH THE REST OF THE AFTERNOON INTO EVENING HOURS.
GALLINA
..PLEASE SEE WWW.WPC.NCEP.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...HNX...LKN...REV...VEF...
ATTN...RFC...RSA...STR...NWC...
LAT...LON 40711556 39991437 38661412 37871431 37001500
36911506 36251552 36641663 36371807 37441867
38281948 39212006 39751907 40431697
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