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ACUS44 KWBC 201446

SCCNS4



=Storm Summary Number 1 for Heavy Rainfall and High Wind

Associated with Tropical Storm Hilary

NWS Weather Prediction Center College Park MD

800 AM PDT Sun Aug 20 2023



...Widespread heavy rainfall and strong winds to occur over

Southern California and Nevada today as Tropical Storm Hilary

rapidly approaches from the south...



Tropical Storm Warnings are in effect over Southern California

(including the San Diego and Los Angeles metropolitan areas).



Flood Watches extend across Southern California northward, into

the Great Basin and interior Northwest.



High Wind Warnings extend across portions of the Mojave and

Sonoran Deserts northward into the Great Basin.



For a detailed graphical depiction of the latest watches, warnings

and advisories, please see www.weather.gov



At 700 AM PDT...Latest surface observations and regional radar

mosiac depict widespread moderate to heavy rainfall across much of

Southern California northward into the Great Basin. The expansive

shield of rainfall is occuring ahead of Tropical Storm Hilary,

analyzed by the National Hurricane Center with a position of

29.7N, 115.9W. Note: rainfall observations for California and

Arizona were collected beginning this Friday at 7 AM PDT, while

observations over Nevada were collected starting Saturday at 7 AM

PDT.



...Selected preliminary Storm Total Rainfall in inches from 700 AM

PDT Fri Aug 18 through 700 AM PDT Sun Aug 20...



...ARIZONA...

YELLOW JOHN MOUNTAIN                 1.33                    

MUSIC MOUNTAIN                       1.15                    

PARKER                               1.11                    



...CALIFORNIA...

MT SAN JACINTO                       2.53                    

KRN02QD                              1.76                    

OX RANCH                             1.22                    

OCOTILLO WELLS                       1.11                    



...NEVADA...

LEE CANYON SNOTEL                    3.10                    

KYLE CANYON                          2.01                    

ASH MEADOWS                          2.00                    





Tropical Storm Hilary is forecast to make landfall over northern

Baja later today before lifting into Southern California. Tropical

storm conditions are expected to begin later today in portions of

the Southwestern U.S. within the Tropical Storm Warning Area. For

more information regarding the track of Hilary, refer to the

National Hurricane Center at nhc.noaa.gov. Potentially historic

rainfall is expected to cause flash, urban, and arroyo flooding

across the Southwestern U.S. Dangerous to locally catastrophic

flooding impacts are expected through Monday morning. For more

information regarding the excessive rainfall assosciated with

Tropical Storm Hilary, please visit wpc.ncep.noaa.gov.



The next Storm Summary will be issued by the Weather Prediction

Center at 800 PM PDT. Please refer to your local National Weather

Service office for additional information on this event.



Asherman

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