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Central PA Start of February


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Someone mentioned brightening in the old thread. VERY bright here at work now. Without looking, I'd swear the sun is out albeit dimly.

If you went outside, I'll be you could see it through the cloud deck. That's what happened here last Wednesday, and also during the clipper on Friday.

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.NEAR TERM /THROUGH TONIGHT/...

-- Changed Discussion --LEAD IMPULSE IN THE FORM OF THE LEFT EXIT REGION OF AN UPPER LEVEL

JET AND ASSOCIATED AND ATTENDANT SSWLY 850 MB JET MAX OF 50 KT WAS

LIFTING QUICKLY NORTH AND EAST OF THE REGION LATE THIS MORNING.

VERY COMPLEX THERMAL STRUCTURE WILL OCCUR ACROSS CENTRAL PEEN OVER

THE UPCOMING 24 HOURS AS THE INTENSIFYING CENTRAL US STORM HEADS

OUR WAY.

925MB AGEOSTROPHIC FLOW WILL VEER AROUND THROUGH THE WEST THIS

AFTERNOON LEADING TO SOME DRYING AND TEMPS RISING A FEW MORE DEG F

TO THE MID 20S /FAR NW/ AND LOWER 30S ACROSS THE SOUTH.

DYNAMIC SFC LOW PRESSURE AND COUPLED JET WILL LIFT NEWD THROUGH

THE LWR/MID MS VLY TNT WITH VERY STRONG WAA/ISENTROPIC LIFT/DIV

ALOFT DEVELOPING OVER THE UPPER OH VLY AND NRN MID ATLC

REGION. ANOMALOUS SLY LLJ WILL TRANSPORT DEEP GOMEX MSTR INTO THE

SHALLOW COLD SECTOR ASSOC WITH ARCTIC HIGH PRES EXTENDING FM THE

NRN PLAINS EWD INTO SRN ONTARIO. THIS WILL SET THE STAGE FOR

ANOTHER ROUND OF HEAVIER WINTRY PCPN STARTING AFT 00Z.

THE AGEOSTROPHIC FLOW WILL CONTINUE TO VEER AROUND TO THE NNE

TONIGHT AND INCREASE TO 35 TO 45 KTS LATE TONIGHT...DRIVING A

SHALLOW LAYER OF LOWER WET BULB TEMPS THROUGH CENTRAL AND SRN PENN

HELPING TO TIGHTEN THE LLVL FRONTAL BOUNDARY NEAR THE MASON DIXON

LINE.

PRECIP TYPE ACROSS MOST OF THE REGION SOUTH OF INTERSTATE 80

TONIGHT SHOULD BE STEADY...MODERATE TO HEAVY FZRA. FZRA TOTALS

TONIGHT WILL RANGE FROM 0.25 ACRS THE FAR SOUTH...TO AS MUCH AS

0.70" NEAR OR JUST TO THE SOUTH OF INTERSTATE 80. THE

AFOREMENTIONED SURGE OF COLDER AIR ALOFT WILL LIKELY MIX IN SLEET

AT TIMES INVOF OF KDUJ...KUNV AND KSEG/KIPT. VERY SLIGHT

DIFFERENCES BETWEEN OPERATIONAL MODELS AND THE LATEST SREF WITH

RESPECT TO THE AXIS OF HIGHEST QPF ACRS CENTRAL OR SOUTHERN PENN.

SFC TEMPS WILL TEETER WITHIN A DEG OR TWO EITHER SIDE OF 32F

TONIGHT ACROSS THE FAR SOUTH...SO WE COULD SEE SOME HIGH

VARIABILITY IN THE ICE ACCUM THERE FROM 0.10" IN SOME OF THE

WARMER METRO AREAS...TO AROUND 0.50" IN RURAL AREAS JUST TO THE

NORTHWEST OF I-81.

TRIMMED SNOWFALL AMOUNTS DOWN BY 2-4 INCHES ACROSS THE FAR NORTH

AS THE MILDER...SLIGHTLY ABOVE FREEZING LAYER /CENTERED BETWEEN

800 AND 850 MB MAKES IT INTO SOUTHERN NEW YORK OVERNIGHT. SO...WE

SHOULD SEE INITIALLY A FEW TO SVRL HOUR PERIOD OF MDT TO HVY SNOW

TONIGHT FROM KBFD...EAST /WITH ANOTHER 2 TO 6 INCHES/ CHANGING TO

MAINLY MDT TO HVY SLEET NEAR THE ROUTE 6 CORRIDOR.

STORM TOTAL SNOWFALL IS GENERALLY 5 TO 10 INCHES OVER THE

NORTHERN MTNS WITH UP TO A FOOT PSBL ALONG THE NY LINE. SLEET WILL

CUT DOWN ON ACCUMS. THERE WILL BE A SHARP CUT-OFF TO THE SNOW AND

SLEET ACCUMULATIONS...WITH VERY LITTLE TO NO ACCUM XPCTD ACRS THE

SRN ZONES. MANUAL QPF BLEND AND SREF MEAN THERMAL PROFILES WERE

USED TO DETERMINE SNOW AND ICE AMTS. THE MOST SIGNIFICANT CHANGE

TO PREVIOUS FCST WAS TO DEC SNOWFALL AMOUNTS OVER THE CENTRAL AND

SCENTRAL MTNS.-- End Changed Discussion --

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sucks about the car! Still wobbling between 29 & 30 here in E York

Damn, sorry to hear.

I saw a guy in some sort of mini-SUV this am with its nose pointing to the air. They had slid off the road into a ditch.

Thanks. What really pisses me off is then they call back and ask if she can still make it in. Never knew bank telling was such an important job. gun_bandana.gif

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29.7 here at the moment.

Cars in our parking lot just wet though. Enough solar making it through to raise surface temps above freezing. Probably will start to refreeze around 2:30 - 3:00.

I'm with maytowninpa on this one in that I think we'll see a fair amount of ice but not crippling in our neck of the woods. Temps too close to freezing means freeze rate won't be that rapid and high rainfall rates won't lend to big accretion either. It's not like 1" of rain = 1" of ice on everything if the temps are below 32.

Here's hoping anyway.

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29.7 here at the moment.

Cars in our parking lot just wet though. Enough solar making it through to raise surface temps above freezing. Probably will start to refreeze around 2:30 - 3:00.

I'm with maytowninpa on this one in that I think we'll see a fair amount of ice but not crippling in our neck of the woods. Temps too close to freezing means freeze rate won't be that rapid and high rainfall rates won't lend to big accretion either. It's not like 1" of rain = 1" of ice on everything if the temps are below 32.

Here's hoping anyway.

good point here - heavy rain actually doesn't accumulate as much, it seems.

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