FOUS30 KWBC 240740
QPFERD

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
340 AM EDT Mon Mar 24 2025

Day 1
Valid 12Z Mon Mar 24 2025 - 12Z Tue Mar 25 2025

...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL FOR PORTIONS OF
NORTHWEST WASHINGTON STATE...

...Olympic Peninsula and Northern Cascades in Northwest 
Washington... A Marginal Risk of excessive rainfall will continue 
during Day 1 over the Olympic Ranges and across the foothills and 
western slopes of the northern Cascades, as the modest Atmospheric
River slowly diminishes today and Monday night. Given continuation
of the AR event, this too is a continuation of the previous 
(yesterday's) ERO, albeit with a drop in the category across the 
board. In other words, a Marginal Risk is in effect across areas 
where there was a Slight in yesterday's D1 ERO, while areas in 
yesterday's Marginal are now within the <5% probability of 
exceeding flash flood guidance. 

Latest guidance shows an atmospheric river continuing to impact 
the region, but also gradually waning through the period. The 00Z 
GEFS shows IVTs decreasing from ~500 kg/m/sec early in the period 
to 300-350 kg/m/sec, as a ridge continues to build and onshore 
flow into the region diminishes. As the AR diminishes, so will the 
potential for additional heavy precipitation. However, the continued
moisture flux into the region early in the period may be sufficient
for additional amounts of 2-3 inches, as indicated by the 00Z 
HREF. These amounts along with additional snowmelt may prolong 
runoff concerns.

Hurley


Day 2
Valid 12Z Tue Mar 25 2025 - 12Z Wed Mar 26 2025

The probability of rainfall exceeding flash flooding guidance is
less than 5 percent.

Hurley


Day 3
Valid 12Z Wed Mar 26 2025 - 12Z Thu Mar 27 2025

The probability of rainfall exceeding flash flooding guidance is
less than 5 percent.

Hurley

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