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Jan 21-22 Coastal Crusher Discussion/Model Thread


earthlight

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Why is it that the globals tend to always cut QPF right as an event is starting?

 

I honestly have no idea. Is it proven that they do that, or is that just the perception people have? I'd be curious to find out if it a systematic bias or just something that sticks in people's minds when nerves are high and the storm is beginning. 

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MESOSCALE DISCUSSION 0031
NWS STORM PREDICTION CENTER NORMAN OK
1003 AM CST TUE JAN 21 2014

AREAS AFFECTED...NRN VA/ERN MD/SERN PA/DE/NJ/SERN NY/CT

CONCERNING...HEAVY SNOW

VALID 211603Z - 212200Z

SUMMARY...SNOWFALL RATES OF 1" TO 2" PER HOUR ARE FORECAST TO
CONTINUE/EXPAND ACROSS PARTS OF THE MID-ATLANTIC REGION AND INTO SRN
NEW ENGLAND THROUGH THIS AFTERNOON.

DISCUSSION...LATEST SURFACE ANALYSIS SHOWS A SURFACE LOW IN THE SWRN
VA/NWRN NC/NERN TN VICINITY...WITH HINTS OF SECONDARY LOW
DEVELOPMENT NERN THE NERN NC/SERN VA COAST. WITH TIME...THIS
DEVELOPING COASTAL LOW IS FORECAST TO BECOME THE PRIMARY
CYCLONE...DEEPENING WITH TIME AS IT SHIFTS OFFSHORE. THE
CYCLOGENESIS IS ASSOCIATED WITH A POTENT SHORT-WAVE TROUGH CURRENTLY
DIGGING ESEWD ACROSS THE OH/TN VALLEY REGION TOWARD THE CAROLINAS.
LARGE-SCALE ASCENT ASSOCIATED WITH THIS STORM SYSTEM IS FORECAST TO
BECOME INCREASINGLY FOCUSED ACROSS THE MID-ATLANTIC REGION AND INTO
SRN NEW ENGLAND THROUGH SUNSET...WITHIN A DEFORMATION ZONE EXPECTED
TO BECOME WELL-DEFINED N/NW OF THE OFFSHORE CYCLOGENESIS.

LATEST RADAR LOOP SHOWS THE HEAVIEST SNOWFALL NOW OCCURRING FROM THE
ERN HALF OF MD AND ADJACENT NRN VA NEWD TO SRN NJ...WITH AN INCREASE
IN COVERAGE OF HEAVIER PRECIPITATION OCCURRING OVER THE LAST HOUR.
EXPECT A CONTINUED EXPANSION -- AND VERY SLOW ENEWD SHIFT -- OF THE
ZONE OF HEAVIEST SNOWFALL...AS THE AFOREMENTIONED AREA OF FOCUSED
ASCENT INTENSIFIES OVER THE NEXT SEVERAL HOURS.

WITH SUBSTANTIAL MOISTURE AND UVV OCCURRING WITHIN THE MOST
FAVORABLE DENDRITIC GROWTH ZONE...AND WITH SNOW-TO-LIQUID RATIOS
LIKELY TO RESIDE ON THE HIGHER END /AVERAGING IN THE 15-1
RANGE/...EXPECT SNOWFALL RATES OF 1" TO 2" PER HOUR ACROSS THE
DISCUSSION AREA FOR SEVERAL HOURS.

..GOSS.. 01/21/2014


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New HRRR still looking good

 

 

Everything looks essentially the same..the banding will be right over our area...the 10:1 ratio models are indicating 5-7" which will fall right into the 6-10" amounts forecasted with possible higher amounts in bands.

 

Not worth fretting over the details of individual runs at this point at least in my opinion, enjoy the snow!!

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NYC Mayor expects snow to end by 10PM tonight therefore things might be ready by morning for  school system..Any chance accumulating snows continues to 4AM?

As far as the steadier snow, models had it starting between 7 and 9 am here, and ending between midnight and 2am for the metro areas. Forecasts had it starting early afternoon and ending Wednesday morning.....the actual forecasts seemed about 5 hours later than the model output

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