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PHL CWA Feb 1-2 Storm OBS and Discussion


Rib

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Connection is aweful getting to their site and NCEP site is really slow. Accessing the models is very slow. Not sure whats going on, but not fast..

Anyone have news out of mount holly? NOAA is running real slow, not at all, wondering if they decided on Ice storm warnings, or if anyone has link for updated discussions?

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Anyone have news out of mount holly? NOAA is running real slow, not at all, wondering if they decided on Ice storm warnings, or if anyone has link for updated discussions?

The whole NWS has been in county zone mode since at least yesterday. There's a mjaor outage with NOAA somewhere.

Anyway, here's the latest from Hayes in the AFD:

FOR THE AREA WITH THE WATCH IN PLACE...THE PRECIPITATION ARRIVES

LATER...POTENTIALLY BETWEEN 0900 UTC AND 1200 UTC WEDNESDAY. SURFACE

TEMPERATURES AT THAT JUNCTURE WILL BE CLOSE TO CRITICAL. THE 0000

UTC NAM AND GFS 2 METER TEMPERATURES ARE JUST ABOVE FREEZING...AND

THIS IS REFLECTED IN THE MOS VALUES FOR EACH MODEL. BASED ON THIS

INFORMATION ALONE...IT WOULD APPEAR AS THOUGH THE THREAT FOR

ONE-QUARTER OF AN INCH OF ICE WOULD BE DIMINISHING.

HOWEVER...LOW LEVEL AGEOSTROPHIC WINDS WILL STILL BE NORTH...AND

FAIRLY STRONG. THIS COULD BE AIDED BY THE FACT THERE IS STILL A GOOD

AMOUNT OF SNOW ACROSS THE REGION THIS MORNING. THE LOW LEVEL

AGEOSTROPHIC WINDS ARE IN STARK CONTRAST TO THE FORECAST EAST

SURFACE WIND AND SOUTHEAST WINDS AT 925 MB. IT WOULD BE APPEAR AS

THOUGH THE GREATEST THREAT FOR NEAR ONE-QUARTER OF AN INCH OF ICE

WOULD BE ACROSS NORTHEAST MARYLAND...NORTHERN DELAWARE (NEAR KILG)

AND KPHL. HPC PROBABILITIES OF ONE-QUARTER OF AN INCH IS BORDERLINE

THROUGH 1200 UTC WEDNESDAY AS WELL.

RIGHT NOW...IT IS SIMPLY TOO CLOSE TO CALL FOR THE ABOVEMENTIONED

AREA. THE TIMING OF THE PRECIPITATION IS CLOSE TO THE TIME WHEN IT

APPEARS SURFACE TEMPERATURES WOULD RISE ABOVE FREEZING. FURTHER

SOUTH AND EAST...SURFACE TEMPERATURES LOOK AS THOUGH THEY HAVE A

BETTER CHANCE OF BEING ABOVE THE FREEZING MARK AS THE STEADIER

PRECIPITATION ARRIVES. THE WINTER STORM WATCH REMAINS IN PLACE. IF

MORE DEFINITIVE INFORMATION ARRIVES LATER THIS MORNING...THIS COULD

CHANGE.

some mixed signals in there as well. No matter how much we try to analyze it, this is a wait-and-see storm.

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Theres actually an outage at some of the major internet backbones this morning; Verizon, NTT, Qwuest, etc. all experiencing outages due to the massive storm. A lot of sites on the internet are slow, unresponsive, etc.

But to answer your question - I have not seen any updates, P+C forecasts are also N/A.

That explains why I have had such trouble with intermittent connectivity,...Thank you for the update!

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some mixed signals in there as well. No matter how much we try to analyze it, this is a wait-and-see storm.

Yeah, it's not easy in these situation to predict exactly where the line will be between not much of an ice storm and a bad ice storm tomorrow morning. I've been saying since yesterday that I think PHL and points south/east should not have much of an issue with icing (if any) for tomorrow morning's rush hour...and the Lehigh Valley on north/northwest will likely have a bad icing situation. For those of us in between (Bucks, Montgomery, Chester and even northern Delaware County)...it's pretty much a wait and see.

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Yeah, it's not easy in these situation to predict exactly where the line will be between not much of an ice storm and a bad ice storm tomorrow morning. I've been saying since yesterday that I think PHL and points south/east should not have much of an issue with icing (if any) for tomorrow morning's rush hour...and the Lehigh Valley on north/northwest will likely have a bad icing situation. For those of us in between (Bucks, Montgomery, Chester and even northern Delaware County)...it's pretty much a wait and see.

Well I made it from Allentown to work in Quakertown, ALlentowns roads were horrendous this morning, even Lehigh Street was dicey, 309 not bad, concerned about the commute home, thinking I might leave at about 4pm, though the roads in Quakertown have an icy glaze on them already. Kids are still in school too, so it should be interesting to see how the rest of the day works out!

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Latest Wxsim program with the 12z data is not very encouraging for NW Chester County

It has almost 0.75" of ZR falling between 1 and 6am...see Wxsim text forecast ouput below...I have never seen it forecast that much ice before. Don't remember too many Ice Warnings from Mt Holly but....would not be surprised to see one later.

Tonight: Dense overcast. A chance of a mix of freezing rain and sleet in the

evening, then a mix of freezing rain and sleet likely after midnight. Low 26,

but temperatures rising after midnight. Wind east around 3 mph in the evening,

becoming 8 mph after midnight. Chance of precipitation 80 percent. Precipitation

(liquid equivalent) mostly between half an inch and one inch. No ice (on ground)

accumulation expected. Above-ground freezing rain accumulation up to 0.7 inches.

Currently

Freezing Fog

Temp 26.9

RH 92%

DP 24.9

Wind N at 4 mph

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Assuming my current temp of 23F holds, the forecasted temp on the NAM for 18z will bust about 4 degrees tooo high.

Just dropped to 30F at PHL.

Interesting winds have gone northerly over the last hour or so.

This far south going to be a borderline situation but something needs to be monitored closely given surface obs, etc.

ERIC

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I'm not quite as gung-ho for big ice in NJ south of the TTN- SMQ-EWR corridor with that LLJ at 850 and 925. Southerly winds in the 50-60kt range are going to really mix that layer quick imo, and with the best thermal gradient well away from the surface low, I am liking the idea of the LLJ exerting influence earlier than later. I think we see the cold scoured out here with the arrival of precipitation. I'm going with <.25 and plain rain by 7am in my current thinking around those places. 202 and 78 corridors are another story.

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