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Rank: F5 Superstorm
Blue Mtn, N of Hbg - Elev 1000'
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5 Jan 2015
Looks like another clipper potential for this weekend.
MON...MVFR/IFR WEST WITH -SHSN. VFR CENTRAL/EAST.
TUE...MVFR/IFR LKLY IN -SN FROM CLIPPER.
WED-THU...MVFR/IFR WITH -SHSN WEST. VFR/MVFR CIGS CENTRAL/EAST.
FRI...REDUCED CONDS POSSIBLE IN -SN WITH ANOTHER CLIPPER.
Showing N of PA/NYS line mostly on the GFS - but we've seen how these clippers tend to trend southward as we get closer. Will that happen here? A bit early to say for sure, but I would not be surprised.
Here's the CMC version
26 Nov 2014
Precip has entered the region. Time for an obsx thread.
Current temps. look too toasty to support snow
SREFS increased by 2" in CTP land - now up to 10"
It does not feel like snow.
Storm is 1008mb and off the Carolina coast ATTM
CTP updated part of their disco
NEAR TERM /UNTIL 6 AM THIS MORNING/...
MESO ANALYSIS AT MIDNIGHT SHOWS THE LOW FORMING JUST OFF THE GA COAST.
MODELS AGREE IN TRACKING THE STORM UP ALONG THEN OFF THE NJ COAST
BY 100 MILES OR SO. THIS SHOULD ASSURE A WIDESPREAD MODERATE TO
HEAVY SNOW OVER MUCH OF EASTERN PA WITH SIG ACCUMS ALL THE WAY
BACK INTO CENTRAL AREAS.
HAVE MADE NO CHANGES TO THE UPDATE PACKAGE. INITIAL THOUGHTS FOR
THE NEXT UPDATE ARE THAT WE WILL BE HARD PRESSED TO REACH WARNING
SNOW AMOUNTS OVER OUR VERY SERN COUNTIES WHERE A RAIN-SNOW MIX
COULD LAST A WHILE. HOWEVER I WILL NOT CHANGE THE WARNING
CONFIGURATION DUE TO EXPECTED IMPACT ON THE HEAVY HOLIDAY TRAVEL
Best yet - full day closure for yours truly, compliments of the Governor.
PCCD employees in the Harrisburg area are authorized a full day closing for Wednesday, November 26, 2014. This is subject to the provisions of Management Directive 530.17.
Here we go!
18 Nov 2014
I suppose we could have extended the recent storm thread, but creating a separate one for the cold element seems apropos.
This is no run of the mill cold shot, especially this early into the cold weather seasons. So, I decided it needs its own thread.
Some images...(used the Uni maps for their ease of viewing)
24Hr temp change
Temps - only S/E Coast, S Fl and s/w AZ and S CA have any real warmth this a.m.
The winds, they are a coming
A few discos
SHORT TERM /9 AM THIS MORNING THROUGH 6 PM WEDNESDAY/...
MEAN 850 MB TEMPS FALL TO AS LOW AS 3-4 SD BELOW NORMAL TODAY AND
TONIGHT. ENS MEAN 850 MB TEMPS AROUND -17C SHOULD TRANSLATE TO
HIGHS OF ONLY THE UPPER TEENS ACROSS THE ALLEGHENIES TO ONLY THE
UPPER 20S IN THE SUSQ VALLEY.
RECORD BOOKS INDICATE THESE COULD BE THE COLDEST DAYTIME HIGHS
FOR THE DATE. BUFKIT SOUNDINGS SUPPORT FREQUENT GUSTS TO ARND
30KTS TUESDAY AFTN...MAKING IT FEEL EVEN COLDER. AT THE
MOMENT...WIND CHILLS LOOK TO REMAIN ABOVE ADVISORY CRITERIA...BU5T
APPARENT TEMPS OF 5-10 BLW ZERO SEEM LIKELY THIS MORNING ACROSS
THE W MTNS...PRETTY IMPRESSIVE FOR MID NOVEMBER
SUNSHINE WILL FADE BEHIND INCREASING HIGH LEVEL
CLOUDINESS. BUT THE MAIN STORY WILL BE THE COLD AND BRISK
CONDITIONS. HIGHS WILL ONLY MAKE IT INTO THE 30S...AND ONLY LOWER
30S IN NORTHWEST MA AND SOUTHWEST NH. WESTERLY WIND GUSTS TO
20-30 MPH WILL MAKE IT FEEL MUCH COLDER. WIND CHILL INDICES ARE
FORECAST TO BE IN THE TEENS AND 20S ACROSS THE REGION
THE TEMPERATURE CURVE IS ON TRACK SO FAR AS THE
ANOMALOUSLY COLD AIR MASS SURGES INTO THE AREA...SO MINIMAL
CHANGES FOR OVERNIGHT LOWS...WHICH WILL BE IN THE 20S FOR
MOST...WITH TEENS IN THE HIGHER ELEVATIONS AND AROUND 30 IN URBAN
AND COASTAL AREAS. WIND CHILLS WILL DROP INTO THE TEENS OUTSIDE OF
URBAN AREAS...WITH SINGLE DIGITS IN THE HIGHER ELEVATIONS.
As one would expect many other disco use similar language - all of them mention this lasting until the 22d, when temps rebound nicely for the lead in to the Holiday week.
Currently 22F IMBY - a 15F drop overnight. No winds yet, most surfaces have dried and will reduce problems with black ice or quick freeze situation. The combo of temps and wind chill will make it feel like the Teens down here in CTP. This is about as cold as I can remember any stretch of weather in November.
1 Nov 2014
Opening this thread as I've been watching the evolution of H5 since this time frame has gotten within 240hrs.
In a pattern sprinkled with multiple bundles of energy, this has what looks to be benefit of the Bering Sea Rule. If I understand the BSR correctly, a strong trough out there pumps the ridge ahead of it. In this case, the ridge becomes part of the overall western ridge structure capable of allowing an eastern shortwave to slide into a longwave trough.
The result, as is currently the 12z GFS Op is a decent coastal system where cold air is close by. Of course, the current solution is likely to adjust quite bit as we get closer. For now, here's the Op run output
Again, another very progressive system - this time around though, there could be some benefit from a preceding cool air mass laid down in the 11/7-8 time pd.
At this point, only the inland region (well inland) of the Mid Atl and NE would see much frozen (read as elevation). But we shall see how the systems evolve upstream, to watch for potential differing influence.
Edit - Ensembles are somewhat all over the place but 2 or 3 resemble the Op solution.
9 Oct 2014
What appears to be the next major threat for rain occurs within this time pd.
The GFS has come in towards agreement with the Euro as to timing and potential for the deep mid continental US trough to, eventually, cut off and linger over the s/e US
GFS - 0z Op (via E Wall)
Note how deep the GFS has the H7 flow - well down into the tropics.
Euro (hr 168) - not quite as cut off as its earlier 12z run of 10/8 and not depicted to have such a deep tap root to the tropics.
Regardless, the flow out ahead of the mid US trough will promote large amounts of Gulf and Atl moisture as we pay the price for warmth, with the humidity and DP's rising.
WPC indicates PWAT Standard Deviation in the order of +1 - +2
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30 Jan 2015 - 1:43
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