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Sept. 28-30 Rainfest Obs/Disc


Ellinwood

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51 minutes ago, Round Hill WX said:

Only .10" today with most of that coming with a predawn shower here in Round Hill. As expected radar is starting to blossom. 

Double-checked the sump pump today to make sure it is operational. Not looking forward to the morning commute. 

63/62 with now calm winds. 

Yep.. About just 0.14 for me too..  

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EXCESSIVE RAINFALL DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
839 PM EDT WED SEP 28 2016

...VALID 01Z THU SEP 29 2016 - 12Z THU SEP 29 2016...
...REFERENCE AWIPS GRAPHIC UNDER...DAY 1 EXCESSIVE RAINFALL...

01Z UPDATE...
HAVE EXPANDED THE MDT RISK AREA TO THE SOUTH AND WEST WITH THE
SOUTHERN EXPANSION DUE PRIMARILY FROM ONGOING CONVECTIVE
TRENDS/TRAINING ALONG STATIONARY BNDRY ACRS CNTL/SRN VA WHICH HAS
LEAD TO LOCAL RAINFALL REPORTS IN EXCESS OF 6 INCHES IN SEVERAL
HOURS.  THE STRONGER CONVECTION CONTINUES TO EXTEND NWD ALONG AXIS
OF OF HIER MLCAPES FROM CNTL NC NWD WHERE STORMS HAVE BECOME A BIT
MORE FOCUSED ALONG THE STALLED FRONTAL BNDRY ACRS SRN VA. FEEL THE
HRRR MODELS HAVE HAD A BETTER HANDLE IN KEEPING HEAVIER RAINS TO
THE EAST TOWARD THE BETTER INSTABILITY/MUCAPES SO FAR AND SHOW A
GRADUAL SHIFT OF THE HEAVIER RAINS NWD ALONG THE I-95 CORRIDOR
TOWARD DCA/BWI DURING THE EARLY OVERNIGHT WITH STRENGTHENING SELY
LOW LEVEL JET.  A SEPARATE AREA OF HEAVIER RAINS IS LIKELY TO
EXPAND ALONG THE UPSLOPE AREAS OF THE BLUE RIDGE/ERN SLOPES OF THE
APLCNS AS WELL BASED ON VAD WIND PROFILES OUT OF LWX WHICH
CONTINUE TO SHOW SLOW STRENGTHENING OF LOW LEVEL E TO SELY FLOW IN
THE SFC-85H LAYER.  THIS INCREASE IN UPSLOPE FLOW/MSTR FLUX IN
CONCERT WITH INCREASING DIFFLUENCE ALOFT WITH APPROACH OF DEEP UPR
LOW OVER THE LOWER OH VALLEY SHOULD LEAD TO AN INCREASING HEAVY
RAIN THREAT WITH POTNL TRAINING ACRS THAT REGION DURING THE
REMAINDER OF THE NIGHT AND ESPECIALLY INTO THE DAY ON THURSDAY. 
DESPITE THE PREFERRED ERN FOCUS BY THE HRRR AND HRRR EXPERIMENTAL
RUNS EARLY IN THE PD..SPREAD REMAINS QUITE HIGH BETWEEN THE HRRR
SOLNS WITH THE PLACEMENT OF HEAVIEST RAINS.  THAT SAID..TIME
LAGGED ENSEMBLE RUNS OF THE HRRR SHOW 6 HR PROBABILITIES IN EXCESS
OF 6 INCHES OF BETWEEN 25 TO OVER 40 PCT FOR PARTS OF CNTL MD SWD
INTO CNTL/ERN VA..SO THE THREAT OF SIGNFICANT HEAVY RAIN AND PSBL
FLASH FLOODING CERTAINLY HAS SUFFICIENT MODEL SUPPORT FOR A MDT
RISK.  SULLIVAN 
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