FGUS75 KTWC 280142
ESFTWC
AZZ501>515-281900-

Hydrologic Outlook
National Weather Service Tucson AZ
640 PM MST Thu Sep 27 2018

...Heavy Rain Possible Sunday through Tuesday...

* Impacts: Localized flooding causing some roads to be impassable.
  Waterways may exit their banks and impact nearby structures.

* Confidence: High on potential for rain. Medium on timing,
  locations, and amounts.

* What: Heavy rain. Valley rain amounts of 0.50 inch to 2 inches, 
  with localized amounts up to 4 inches especially across mountains.

* Where: Across the Southwest US, including southeast Arizona.
  This includes Tucson, Nogales, Safford, Douglas, Sierra Vista,
  Ajo, and the Tohono O'odham Nation.

* 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 to the northwest will move through California
  and the Four Corners states. This setup will likely cause
  widespread rain to develop. Rain rates may be quite high at times, 
  in excess of 1 inch per hour, which will have the potential to 
  cause flash 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 Tucson on Facebook at www.facebook.com/NWSTucson
and on Twitter at www.twitter.com/NWSTucson. 

$$