029  
FGUS75 KPSR 281833  
ESFPSR  
AZZ530>563-CAZ560>570-291300-  
 
HYDROLOGIC OUTLOOK  
NATIONAL WEATHER SERVICE PHOENIX AZ  
1133 AM MST FRI SEP 28 2018 /1133 AM PDT FRI SEP 28 2018/  
   
..HEAVY RAIN POSSIBLE SUNDAY NIGHT THROUGH TUESDAY  
 
* WHAT: HEAVY RAIN. WIDESPREAD AMOUNTS OF 1 TO 2 INCHES WITH  
LOCALIZED AMOUNTS UP TO 4 INCHES ARE POSSIBLE.  
 
* IMPACTS: LOCALIZED FLOODING CAUSING SOME ROADS TO BE IMPASSABLE.  
LOCAL WASHES AND WATERWAYS MAY EXIT THEIR BANKS AND IMPACT  
NEARBY STRUCTURES.  
 
* CONFIDENCE: HIGH ON POTENTIAL FOR RAIN. MEDIUM ON TIMING,  
LOCATIONS, AND AMOUNTS.  
 
* WHERE: ACROSS THE SOUTHWEST US, INCLUDING SOUTH-CENTRAL AND  
SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. THIS INCLUDES  
PHOENIX, YUMA, GLOBE, AND CASA GRANDE IN ARIZONA, AND THE  
IMPERIAL VALLEY IN CALIFORNIA.  
 
* WHEN: BEGINNING SUNDAY NIGHT AND CONTINUING THROUGH TUESDAY.  
 
* SUMMARY: ABUNDANT MOISTURE ASSOCIATED WITH A TROPICAL SYSTEM  
WILL MOVE NORTHWARD INTO THE SOUTHWEST US. MEANWHILE, A LOW  
PRESSURE SYSTEM WILL MOVE THROUGH CALIFORNIA AND THE FOUR  
CORNERS STATES. THIS SETUP WILL CAUSE WIDESPREAD RAIN TO  
DEVELOP. RAIN RATES MAY BE QUITE HIGH AT TIMES, IN EXCESS OF 2  
TO 4 INCHES PER HOUR, WHICH WILL HAVE THE POTENTIAL TO CAUSE  
LOCALIZED FLOODING. DUE TO THE DURATION OF THE EVENT, THE  
POTENTIAL EXISTS FOR MORE WIDESPREAD FLOODING TO OCCUR.  
 
CONTINUE TO MONITOR FORECASTS FOR UPDATES AS THIS SITUATION  
UNFOLDS. FOLLOW NWS PHOENIX ON FACEBOOK AT  
WWW.FACEBOOK.COM/NWSPHOENIX AND ON TWITTER AT  
WWW.TWITTER.COM/NWSPHOENIX.  
 
 
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