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Jan 21-22 Coastal Crusher Discussion/Model Thread


earthlight

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what is the significant of this based upon your knowledge?

 

Based on the H5, the differences between the 07Z HRRR and the 06Z GFS are pretty notable. The 528 dm contour line is over the TN/NC border @HR 14 (21Z) from the 07Z HRRR, while the 06Z GFS has the 528 dm contour line over the KY/VA border @HR 15 (21Z). 

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what is the significant of this based upon your knowledge?

 

This means that the HRRR is suggesting a faster developing SLP and the Heaviest snowfall axis to fall directly over NYC. This could result in much higher amounts. There could be at least 12"+ from PHL to LI. I'll wait until mid morning and then see if the HRRR is consistent with the more amplified idea. 

 

To add on, the H5 vort could tilt faster than what the GFS is showing. Which will enable the SLP to hug the coast more and the snowfall banding will be slower/more vertically stacked. 

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I have to wonder if the now upped forecasts of 8-12" may still be a little low based on the current trends, also a wind chill advisory to go along with that. This has really become an impressive storm, KU territory perhaps.

When the SREFs came out with 0.5 qpf I screamed KU, earthlight joked about it.

 

Well here we are now, use HRRR and RAP

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I have to wonder if the now upped forecasts of 8-12" may still be a little low based on the current trends, also a wind chill advisory to go along with that. This has really become an impressive storm, KU territory perhaps.

Based on qpf and snow ratios. About .3 falls with temperatures in the 20s which would yield around 5 inches, and when temperatures fall into the teens another .4 falls which is about 9 inches, so I think 8-12 inches is a good range with higher amounts possible.

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Rip city! On like donkey kong

...RADAR TRENDS AS OF 10Z SHOW SOME BANDING ACROSS SRN PA...ALIGNED WITH WEAK FRONTOGENETICAL FORCING. THIS BAND SHOULD INTENSIFY AND EXPAND EWD LATER TODAY WITH HEAVIER SNOW RATES FROM MD/ERN PA INTO NEW JERSEY AND SRN NEW YORK WHERE DEEP FRONTOGENETICAL FORCING WILL BOTH INTENSIFY AND BE ALIGNED WITH TEMPERATURE PROFILES FAVORABLE FOR MAXIMUM DENDRITIC GROWTH. ..JEWELL.. 01/21/2014

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Rip city! On like donkey kong

...RADAR TRENDS AS OF 10Z SHOW SOME BANDING ACROSS SRN PA...ALIGNED WITH WEAK FRONTOGENETICAL FORCING. THIS BAND SHOULD INTENSIFY AND EXPAND EWD LATER TODAY WITH HEAVIER SNOW RATES FROM MD/ERN PA INTO NEW JERSEY AND SRN NEW YORK WHERE DEEP FRONTOGENETICAL FORCING WILL BOTH INTENSIFY AND BE ALIGNED WITH TEMPERATURE PROFILES FAVORABLE FOR MAXIMUM DENDRITIC GROWTH. ..JEWELL.. 01/21/2014

 

Can't wait. :D

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It's going to be a very nice storm for us. I wouldn't be surprised if we beat what fell on Jan 2.

Looking at the RAP and HRRR show frontogenesis at 700mb, heavy banding from Philly to LI this afternoon, 1983 like http://www.twisterdata.com/index.php?prog=forecast&model=RAP&grid=255&model_yyyy=2014&model_mm=01&model_dd=21&model_init_hh=10&fhour=11&parameter=VVELD&level=700&unit=MB&maximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false#RAP_255_2014012110_F11_40.5000N_74.0000W

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What a day an night ahead

 

Predictions:

 

Horrible rush hour, LIE to be closed later

 

Crush zone unknown, but some spots 15 - 18 inches

 

NYC/LI schools shut down tomorrow, announcement made tonight, not tomorrow

 

Thundersnow

 

Long Island upgraded to Blizzard Warning with afternoon package.

agree with everything other than the last one.

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