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Sept. 28-30 Rainfest Obs/Disc


Ellinwood

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It's interesting that the hi-res guidance is really going nuts this evening with torrential rains from convection, while the lower-res guidance isn't as enthused but gets up a drowning Thursday night.    Big totals this evening would really set the stage for trouble Thursday night.   Seems like the flash flood watch, which starts at 2AM, probably needs to start earlier.

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Just now, high risk said:

It's interesting that the hi-res guidance is really going nuts this evening with torrential rains from convection, while the lower-res guidance isn't as enthused but gets up a drowning Thursday night.    Big totals this evening would really set the stage for trouble Thursday night.   Seems like the flash flood watch, which starts at 2AM, probably needs to start earlier.

12z 4km NAM shows this well from this evening into the overnight

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12 minutes ago, Eskimo Joe said:

Spotter reported 4.55" of rain between 6:15am and 10:00 am in Huntingtown, Calvert County.  

Pretty good indication of how it could go down anywhere over the next 36 hours.  Just two training bands over the same area and major flash flooding is on tap regardless of how dry the ground is. 

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WPC - 

 

1500 UTC UPDATE

NO CHANGES MADE AT THE MOMENT TO THE EARLIER EXCESSIVE RAINFALL
POTENTIAL OUTLOOK.  THE ONLY ITEMS OF NOTE TO ADD TO THE PREVIOUS
DISCUSSION IS THE POTENTIALLY FOR VERY HEAVY TOTALS IN THE I-95
CORRIDOR.  THE PAST FEW RUNS OF THE HRRR EXPERIMENTAL HAVE SHOWN
AN AXIS OF 5"+ AMOUNTS WITH LOCAL MAXIMA OF UP TO 10 INCHES ACROSS
THESE REGIONS.  EARLIER HEAVY RAINS THAT FELL OVER PORTIONS OF
SOUTHERN MD PRODUCED TOTALS OF 2-4"+ IN A BRIEF
PERIOD---INCREASING CONFIDENCE THAT THE HIGHER END TOTALS ARE
POSSIBLE LATER WEDNESDAY INTO WEDNESDAY NIGHT/EARLY THURSDAY.  THE
LATEST NAM CONEST (1200 UTC) IS STILL A WESTERN OUTLIER WITH ITS
MAX QPF BUT HAS TRENDED HEAVIER OVER NW VIRGINIA AND CENTRAL
MD---CLOSER TO THE FARTHER EASTWARD MAX AXIS OF THE REMAINING
GUIDANCE. 
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Not so sure about the tor threat up here. Maybe southern to central VA on north end. This rain developing in the cooler air is going to keep reinforcing the boundary and we have NE winds in DC. Could eventually shift north as flow turns more toward the south.

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