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Jan 11-12 Model/Forecasting Discussion


Ji

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does this give you guys any hope......rainshadow recently posted this update............

For those of you out on the ledge about the storm "going east!" I'd suggest reading Rainshadow's (Tony from NWS-Mt. Holly) recent post, above, as well as their 7:55 am update:

.NEAR TERM /THROUGH TONIGHT/...

-- Changed Discussion --THROUGH THE 12Z OBS, A EURO AND CAN GGEM COMBO IS WORKING THE BEST

WITH THE DEVELOPING SFC LOW, TUCKED IN CLOSER TO THE COAST THAN

THE OTHER MODELS. AT 500MB ITS ABOUT THE SAME, NOT MUCH OF A

DIFFERENCE BUT THE FORMER IS CLOSEST. ALL THE MODELS ARE HANDLING

THE MIDWESTERN CLOSED LOW EQUALLY AND QUITE WELL. LAST WALLOPS IS

ALREADY UP TO +1C AT 850MB, ALL OF THE MODELS WERE TOO COLD WITH

THEIR FCST 850MB TEMPS, WITH THE GFS THE CLOSEST. THIS ADDS THE

POSSIBILITY OF MORE NON SNOW PTYPE ISSUES ALONG OUR COAST. NO

CHANGES FOR NOW WILL HAVE THE FIRST 24HRS IN ON BOTH MODELS FOR

THE 11 AM UPDATE.

IT WOULD APPEAR AS THOUGH THE WARM LAYER SEEN ON THE 0000 UTC

KGSO AND KMHX SOUNDINGS HAS SLIPPED NORTH INTO SOUTHEAST VIRGINIA

AND THE SOUTHERNMOST DELMARVA PENINSULA. BASED ON THIS...THE

POTENTIAL SLEET WAS INCLUDED IN THE FORECAST FOR PORTIONS OF

EASTERN MARYLAND AND SOUTHERN DELAWARE AS THE PRECIPITATION GETS

STARTED.

PUTTING THE REMAINING PIECES OF THE PUZZLE TOGETHER THIS

MORNING... THE REMAINDER OF THE DELAWARE VALLEY CURRENTLY IN THE

WATCH WILL BE UPGRADED TO WINTER STORM WARNING...AS WILL NORTHWEST

NEW JERSEY AND COASTAL OCEAN COUNTY NEW JERSEY.

THE EASTERN MARYLAND COUNTIES CURRENTLY IN THE WATCH WILL BE

CONVERTED TO WINTER WEATHER ADVISORIES. EASTERN SUSSEX COUNTY

DELAWARE...AS WELL AS COASTAL SECTIONS OF CAPE MAY AND ATLANTIC

COUNTIES WILL BE SWITCHED TO WINTER WEATHER ADVISORIES...AS WILL THE

LEHIGH VALLEY AND SOUTHERN POCONOS.

THE INGREDIENTS FOR A SIGNIFICANT WINTER WEATHER EVENT ARE COMING

TOGETHER THIS MORNING. A STRONG LOW LEVEL BAROCLINIC EXTENDS FROM

NORTHEAST TEXAS TO THE NORTH/SOUTH CAROLINA BORDER. THE SOUTHERN JET

STREAK IS ABOUT 3 TO 6 HOURS AHEAD OF THE NORTHERN JET STREAK

LOCATED OVER MISSOURI. ON THE EASTERN EDGE OF THE BAROCLINIC

ZONE...THERE ARE SIGNS THAT A SURFACE LOW IS TRYING TO ORGANIZE OFF

THE SOUTH CAROLINA COAST. THIS LOOKS TO THE THE SYSTEM THAT WILL

DEEPEN RAPIDLY ONCE IT GETS TO OUR LATITUDE AND FURTHER NORTHEAST.

FOR THE MOST PART...IT WOULD APPEAR AS THOUGH THE PHASING OF THE TWO

SHORT WAVES WILL OCCUR JUST AS IT REACHES OUR LATITUDE. THIS PUTS THE

FORECAST AREA IS A TRANSITION ZONE...AS SOUTHWEST PORTIONS OF THE

AREA ON THE BACK SIDE OF THE MOISTURE...AND NORTHEAST AREAS JUST

GETTING INTO THE BEST LIFT AND DYNAMIC COOLING AS THE SYSTEM STARTS

TO PULL OUT WEDNESDAY MORNING.

THE DRY AIRMASS IN PLACES SHOULD SLOW THE NORTHEAST PROGRESSION OF

THE PRECIPITATION SHIELD LATER THIS MORNING AND THIS AFTERNOON. WITH

MID LEVEL RIDGING JUST EXITING...SOME PORTIONS OF THE AREAS

(PARTICULARLY NORTHEAST) MAY EVEN SEE SOME SUNSHINE EARLY. AFTER

THIS...THE WARM AIR ADVECTION AHEAD OF THE NORTHERN SHORT WAVE

SHOULD MOISTENING THE COLUMN DURING THE AFTERNOON.

THE LEADING EDGE OF THE STEADIER PRECIPITATION SHOULD GET INTO

DELAWARE AND EASTERN MARYLAND DURING THE AFTERNOON...REACHING A

KPHL-KACY LINE BY ABOUT 600 PM. STRONG WARM AIR ADVECTION SHOULD

ALLOW THE SNOW TO INCREASE IN INTENSITY FAIRLY QUICKLY AFTER IT

STARTS. IT APPEARS AS THOUGH 1 TO 3 INCHES OF SNOW COULD FALL ACROSS

EASTERN MARYLAND AND PORTIONS OF DELAWARE BEFORE DARK.

THE AIRMASS HAS NOT CHANGED MUCH IN THE LAST COUPLE OF DAYS...SO

HIGHS TODAY SHOULD BE CLOSE TO WHERE THEY HAVE BEEN THE LAST 2 DAYS.

THE EXCEPTION HERE IS ALONG THE COAST. AS THE SURFACE HIGH FINALLY

GETS OFFSHORE THIS MORNING...THE RETURN FLOW AROUND THE HIGH WILL

TURN THE BOUNDARY LAYER FLOW ONSHORE.

WITH SEA SURFACE TEMPERATURES AROUND 40...AND AIR TEMPERATURES OVER

THE WATERS THIS MORNING IN THE LOWER 30S...HIGHS ALONG THE COAST

SHOULD GET ABOVE FREEZING. THIS SETS THE STAGE FOR A PRECIPITATION

TYPE PROBLEM. AS THE PRECIPITATION STARTS...EVAPORATIVE COOLING

SHOULD ALLOW THE PRECIPITATION TO START AS SNOW...BUT ONCE THIS IS

USED UP...THE BOUNDARY LAYER WARMS BACK ABOVE FREEZING. THIS SHOULD

CHANGE THE PRECIPITATION ALONG THE IMMEDIATE COAST TO RAIN.-- End Changed Discussion --

http://forecast.weat...=1&highlight=on

One more point: I would imagine that if mixing/rain are issues along the immediate Jersey Shore, then the same may be true for at least the eastern parts of LI. This is not a forecast, just an observation that things often work out that way...

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Your right, we get what we get, that's fine. As far as model watching, that is pointless now if you ask me as you have already said the event will be underway in few hours, no need for models. Just stating what I believe gfs will show.

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Just tired of reading some of the people who are using this thread as a therapy session....I'm sure at some point someone will say that daddy touched me in my private space and that's why they are so negative.

Passions run deep with this hobby. People on the outside would thing we're all nutcases..and to a minor extent, we are. I've moved into acceptance stage..I just want to get this over with and I'll enjoy whatever we get along the way. THere will be other storms.

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GFS basically stays constant for us. But interesting that New York isn't going to get any great snowstorm from that... The city looks barely into .50. Nam shows over 1.0.. Will be interesting what unfolds up there. I read somewhere some mets up there were t hrowing out 12 to 20 inch forecats for the city up there this morning.

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Passions run deep with this hobby. People on the outside would thing we're all nutcases..and to a minor extent, we are. I've moved into acceptance stage..I just want to get this over with and I'll enjoy whatever we get along the way. THere will be other storms.

I agree...I like all snow and always will..good luck Randy

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Decent chance that after today DCA will be above normal snowfall on the year.

That may wind up being true- but it would have been nicer to get there with a 5 inch storm rather than with 8 dustings. Also, hitting normal snowfall when the entire 2/3 of the country is 5 times avg doesn't make one feel so good. It's like getting a 70 on a test when the rest of the class got a 95

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That may wind up being true- but it would have been nicer to get there with a 5 inch storm rather than with 8 dustings. Also, hitting normal snowfall when the entire 2/3 of the country is 5 times avg doesn't make one feel so good. It's like getting a 70 on a test when the rest of the class got a 95

link? ;)

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