Storm Summary Number 1 for Southwest Heavy Rainfall and Flash
Flooding
NWS Weather Prediction Center College Park MD
800 PM MST Sun Nov 01 2026

...Widespread heavy rain and significant flash flooding across
Arizona and the Four Corners region continues into tonight... 

Flood Advisories are in effect for portions of Arizona, New Mexico
and far west Texas.

Winter Weather Advisories are in effect for portions of the
Colorado and Utah Mountains.

Winter Storm Warnings are in effect for portions of the Colorado
mountains and northeast Nevada.

Flash Flood Warning is in effect for northeastern Arizona.

Flood Warnings are in effect for portions of northern Arizona,
northwestern New Mexico, far southwestern Colorado, and southern
Utah.

Flood Watches are in effect for the Four Corners region.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 700 PM MST...A deep upper level trough over the Great Basin,
combined with an anomalous plume of Pacific moisture, continued to
produce rain across the Southwest. At the surface, a 1001 mb
(29.56 in Hg) low was analyzed over central Utah with a cold front
extending southwestward across northwest Arizona into southern
California, while a second low over southeast Colorado had a cold
front extending south through central New Mexico. Rain continued
this evening across much of Arizona, Utah, western Colorado, and
northern Mew Mexico, with snow at the higher elevations of the
Colorado Rockies. Heavy rain over saturated ground produced
widespread flash flooding on Sunday. An estimated 150 to 200 homes
were flooded in the Rimrock and Lake Montezuma areas of Arizona,
with evacuations ongoing, and more than ten swift water rescues
were reported in and around Tuscon. 

...Selected preliminary Storm Total Rainfall in inches from 700 AM
MST Sat Oct 31 through 700 PM MST Sun Nov 01...

...ARIZONA...
CROWN KING RAWS                      6.21                    
SIX SHOOTER CANYON                   5.67                    
GLOBE RAWS                           5.58                    
COLUMBINE RAWS                       5.11                    
OAK CREEK AT SLIDE ROCK              4.72                    
SOLLERS RAWS                         4.39                    
SUMMERHAVEN 3 N                      4.22                    
RINCON RAWS                          4.19                    
HUMBUG CREEK                         4.06                    
PINE RAWS                            3.91                    
LAKESIDE 4.5 NW                      3.80                    
IRON SPRINGS RAWS                    3.76                    
TONTO BASIN 8 WNW                    3.70                    
MORMON LAKE                          3.53                    
SUNSET POINT                         3.53                    
FLAGSTAFF AIRPORT                    3.42                    
TUSCON INTL AIRPORT                  1.92                    
PRESCOTT                             1.88                    
PHOENIX DEER VALLEY                  1.76                    
PHOENIX SKY HARBOR                   1.09                    

...COLORADO...
SANDOVAL RAWS                        2.98                    
DURANGO 6 NNW                        2.95                    
SALTER RAWS                          2.66                    
DEVIL MOUNTAIN RAWS                  2.58                    
MESA MOUNTAIN RAWS                   2.28                    
BIG BEAR PARK RAWS                   2.20                    
MOREFIELD RAWS                       2.11                    
CHAPIN RAWS                          1.99                    
CORTEZ                               1.17                    

...NEVADA...
KYLE CANYON                          1.74                    
ELBOW CANYON                         1.73                    
KANE SPRINGS RAWS                    1.71                    
IMMIGRATION WASH RAWS                1.59                    
CHERRY CREEK SUMMIT                  1.56                    

...NEW MEXICO...
ALBINO CANYON RAWS                   2.09                    
WASHINGTON PASS RAWS                 1.89                    
CHAMA                                1.80                    
DULCE                                1.72                    
MOGOLLON RAWS                        1.72                    
LUNA 1 ENE                           1.70                    
STONE LAKE RAWS                      1.56                    
FARMINGTON                           0.79                    

...UTAH...
LAVA POINT RAWS                      3.77                    
FISHLAKE                             3.54                    
MOON LAKE                            2.27                    
BUCK FLAT                            2.26                    
ZION NP 18 SSE CEDAR CITY            2.17                    
WILLOW GULCH RAWS                    2.03                    
ASSAY                                1.99                    
WOLF CREEK SUMMIT                    1.98                    
EAST FORK VIRGIN RIVER NR GLENDALE   1.91                    
AGUA CANYON                          1.84                    
BLANDING                             1.63                    


The upper level trough and associated surface lows will continue
to move eastward tonight, gradually tapering the heavy rain from
west to east across the Four Corners region. A Moderate risk
(level 3 of 4) of excessive rainfall remains in effect through
early Monday morning for portions of the Mogollon Rim of Arizona
and the San Juan Mountains of southwest Colorado, as well as from
northwest Arizona into southwest Utah, with a broader slight risk
(level 2 of 4) across much of the Four Corners states. Saturated
soils will cause additional rainfall to quickly become runoff,
keeping dry washes, arroyos, slot canyons, and burn scars
especially vulnerable to flash flooding, while river flooding will
continue in parts of the region. High-elevation wet snow is
expected tonight over the northern and central Rockies as far
south as the San Juan Mountains, where Winter Storm Warnings are
in effect. The Storm Prediction Center also has a Slight Risk of
severe thunderstorms from the southern Rockies to the southern
High Plains tonight. On Monday, the system will develop into a
strong low pressure system over the northern Plains, shifting the
focus for heavy rain and severe weather into the Plains. 

The next Storm Summary will be issued by the Weather Prediction
Center at 800 AM MST. Please refer to your local National Weather
Service office for additional information on this event.

Eovino