Storm Summary Number 3 for Heavy Rainfall and High Wind Associated
with Post-Tropical Cyclone Hilary
NWS Weather Prediction Center College Park MD
800 AM PDT Mon Aug 21 2023

...Widespread heavy rainfall and strong winds to focus across the
Great Basin today and portions of the Northern Rockies today as
Post-Tropical Cyclone Hilary's tracks north...

High Wind Warnings extend across portions of the Great Basin and
Northern Rockies.

Flash Flood Warnings are in place across portions of Southern
California.

Flood Watches extend across Southern California northward into the
Great Basin and interior Northwest.

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
mosaic show widespread moderate to heavy rainfall has shifted
northward into the Great Basin and Northern Rockies, although
lingering shower activity is noted across Arizona and Southern
California. The expansive shield of rainfall remains tied to a
plume of tropical moisture associated with Post-Tropical Cyclone
Hilary, analyzed with a position of 40.6N, 118.0W at 5AM PDT.
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 Mon Aug 21...

...ARIZONA...
HILLTOP                              2.10                    
TWEEDS POINT                         1.67                    
LINDBERGH HILL                       1.54                    
BLACK HILLS                          1.47                    
YELLOW JOHN MOUNTAIN                 1.35                    
MUSIC MOUNTAIN                       1.17                    
PARKER                               1.11                    
YUMA PROVING GROUND                  0.79                    

...CALIFORNIA...
MT. SAN JACINTO                     11.74 ELEVATION 8616FT   
RAYWOOD FLATS                       11.73 ELEVATION 7079FT   
HEART BAR                            9.67 ELEVATION 6690FT   
RANCHITA                             7.38 ELEVATION 4180FT   
MT LAGUNA                            7.11 ELEVATION 6000FT   
LEWIS RANCH                          7.04                    
LOWER ANGEL PEAK                     6.63                    
WRIGHTWOOD                           6.23 ELEVATION 5950FT   
UPPER TAHQUITZ CREEK                 6.22 ELEVATION 5600FT   
WALKER PASS                          6.09 ELEVATION 5572FT   
AVEK                                 6.04                    
PINE MOUNTAIN CLUB                   3.75                    

...NEVADA...
LEE CANYON                           8.70 ELEVATION 8618FT   
LOWER ANGEL PEAK                     6.52                    
YUCCA MOUNTAIN                       5.62 ARL SORD           
AREA 12 MESA                         5.56 ARL SORD           
QUIMA PEAK                           4.03                    
TIMBER MTN                           3.76                    
RAINBOW CANYON                       3.40                    
BERRY CREEK                          3.10                    
ASH MEADOWS                          2.00                    

...Selected preliminary Peak Wind gusts in miles per hour earlier
in the event...

...ARIZONA...
YUMA ARPT                              69                    
SAFFORD 4 ENE                          60                    
BENDER SPRINGS                         59                    
MOBILE 2.2 SE                          47                    
GILA BEND                              46                    

...CALIFORNIA...
MAGIC MOUNTAIN TRUCK TRL               87                    
BIG BLACK MOUNTAIN                     84                    
ESSEX 10 SSE                           83 OLD WOMAN MOUNTAIN 
PALOMAR MTN LOOKOUT                    79                    
PIGSAH PEAK                            79                    
HAUSER MOUNTAIN                        78                    
VALLEY CENTER 7 E                      70                    
CRESTLINE 5 NW                         69                    
SANTA CLARITA 10 ESE                   64 ELEVATION 4483FT   
THOUSAND OAKS 8 SW                     57 BONEY MOUNTAIN     
OCEANSIDE 5 NW                         52 CAMP PENDLETON     


Post-Tropical Cyclone Hilary is forecast to continue its track
north into the heart of the Great Basin today, spreading heavy
rainfall and high wind gusts throughout the West on Monday.
Accordingly, isolated to scattered instances of flash flooding are
possible today across much of the West, where a Slight Risk of
Excessive Rainfall is in effect. For more information regarding
the track of Post-Tropical Cyclone Hilary and associated Excessive
Rainfall impacts, refer to the Weather Prediction Center at
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