Jump to content
  • Member Statistics

    17,608
    Total Members
    7,904
    Most Online
    NH8550
    Newest Member
    NH8550
    Joined

Potential November 27th Event


nj2va

Recommended Posts

  • Replies 253
  • Created
  • Last Reply

WWA north of the M/D line.......2-4"

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE STATE COLLEGE PA

1243 PM EST MON NOV 26 2012

PAZ035-036-056>059-063>066-270600-

/O.NEW.KCTP.WW.Y.0017.121127T0500Z-121127T1800Z/

FULTON-FRANKLIN-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-

YORK-LANCASTER-

INCLUDING THE CITIES OF...MCCONNELLSBURG...CHAMBERSBURG...

NEWPORT...HARRISBURG...HERSHEY...POTTSVILLE...LEBANON...

CARLISLE...GETTYSBURG...YORK...LANCASTER

1243 PM EST MON NOV 26 2012

...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO

1 PM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER

WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM MIDNIGHT

TONIGHT TO 1 PM EST TUESDAY.

* LOCATIONS...SOUTH CENTRAL MOUNTAINS AND LOWER SUSQUEHANNA RIVER

VALLEY.

* HAZARD TYPES...SNOW.

* ACCUMULATIONS...2 TO 4 INCHES...EXCEPT LOCALLY HIGHER AMOUNTS ON

RIDGETOPS.

* TIMING...LIGHT SNOW WILL DEVELOP OVER THE ADVISORY AREA AFTER

MIDNIGHT...AND CONTINUE THROUGH TUESDAY RUSH HOUR BEFORE

TAPERING OFF BY MID TO LATE MORNING.

* IMPACTS...SNOW AND SLUSH COVERED AND SLIPPERY ROADWAYS FROM THE

PRE DAWN HOURS THROUGH THE MORNING COMMUTE AND MID TO LATE

MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW WILL

CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND

LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. MOTORISTS

SHOULD BE ESPECIALLY CAUTIOUS ON BRIDGES AND OVERPASSES...WHERE

SLIPPERY SPOTS DEVELOP FIRST. STAY TUNED TO NOAA WEATHER RADIO OR

YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR THE LATEST

UPDATES.

PLEASE REPORT SNOW ACCUMULATIONS TO THE NWS STATE COLLEGE FACEBOOK

PAGE...OR BY USING TWITTER @NWSSTATECOLLEGE. ADDITIONAL DETAILS

CAN ALSO BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

DEVOIR

Link to comment
Share on other sites

I feel I might be able to eek out a few inches here just south of the PA line in northern MD. I have some elevation (1000 ft) and that helps plus the SREF has been pretty bullish on precip along the mason dixon line today. Latest 15z SREF now show an area of over .5 along the border counties in Northern MD and southern PA. Even here though temps are iffy...33-35 degrees the whole time.

Link to comment
Share on other sites

Nam is showing some 30-35dbz returns over Ballmer. They're gonna get smoked:

Jokes aside, after taking a close look at the Nam I'm thinking I actually do get to see some flakes in the air. Sim radar looks ok. .5" line is south of the mason dixon. I'm solidly in the .25-.5 stripe.

Seeing flakes fall will be a win for me. Especially considering next week is looking tropical.

Link to comment
Share on other sites

Nam is showing some 30-35dbz returns over Ballmer. They're gonna get smoked:

Jokes aside, after taking a close look at the Nam I'm thinking I actually do get to see some flakes in the air. Sim radar looks ok. .5" line is south of the mason dixon. I'm solidly in the .25-.5 stripe.

Seeing flakes fall will be a win for me. Especially considering next week is looking tropical.

Bob, I would be stunned if you saw any flakes in Rockville. At 7Am the Twister sounding for Rockville has a 975 mb temp of plus 5.2C which is over 40 degrees and the surface temp is forecast to be right at 40 degrees according to the same NAM you were looking at. The 10 AM surface temp is 5.1C again over 40F. Even if you precip like hades I don't see it being snow where you live. By 18 it cools but still is in the upper 30s. Th NAM temps would have to be really bad and at that time range, I doubt they would bust that bad. Hope I'm wrong but the progs are strongly against you.

Link to comment
Share on other sites

Today warmed more than forecast, though we should keep clear skies for at least the first few hours after dark so that might help minimize the impact. My rain better be cold.

Our temps may very well fall a little faster than forecast until the clouds come in and then may actually warm a little as they radiate. I think the surface temps will be a little deceiving as the sunny day is probably warmed the temps a bit and it will be quite a bit warmer above the inversion than at the surface.

Link to comment
Share on other sites

Our temps may very well fall a little faster than forecast until the clouds come in and then may actually warm a little as they radiate. I think the surface temps will be a little deceiving as the sunny day is probably warmed the temps a bit and it will be quite a bit warmer above the inversion than at the surface.

I'm in a great spot for radiational cooling. But this looks like another of those nights where I drop to 31/27 by midnight, then a 5 mph wind and a cloud show up and 45 minutes later its 37/32.

Link to comment
Share on other sites

IAD sounding: Quite toasty in the low levels, but also pretty dry. Still, wet bulbs are above freezing up to ~900mb.

http://weather.uwyo.edu/cgi-bin/sounding?region=naconf&TYPE=TEXT%3ALIST&YEAR=2012&MONTH=11&FROM=2700&TO=2700&STNM=72403

-----------------------------------------------------------------------------

PRES HGHT TEMP DWPT RELH MIXR DRCT SKNT THTA THTE THTV

hPa m C C % g/kg deg knot K K K

-----------------------------------------------------------------------------

1011.0 93 7.4 -1.6 53 3.38 0 0 279.7 289.3 280.2

1007.0 125 10.2 -6.8 30 2.29 49 2 282.8 289.6 283.2

1002.0 165 10.6 -6.4 30 2.37 110 5 283.6 290.6 284.0

1000.0 181 10.6 -6.4 30 2.38 135 6 283.8 290.8 284.2

985.1 305 9.6 -6.6 31 2.37 155 9 284.0 291.0 284.4

949.3 610 7.1 -7.2 35 2.36 165 6 284.5 291.5 284.9

925.0 824 5.4 -7.6 39 2.34 180 7 284.8 291.8 285.2

914.8 914 4.7 -7.8 40 2.34 185 7 285.0 292.0 285.4

880.9 1219 2.4 -8.3 45 2.33 230 12 285.7 292.7 286.1

850.0 1508 0.2 -8.8 51 2.32 255 16 286.3 293.3 286.8

816.4 1829 -2.3 -9.9 56 2.22 270 19 287.0 293.7 287.4

803.0 1961 -3.3 -10.3 58 2.18 276 26 287.3 293.9 287.7

Link to comment
Share on other sites

Interesting there are not many clouds out ahead of this and temps have cooled into the 30s. Wet bulbs below freezing now in some northern areas. NRN Maryland may have a shot at more frozen than expected assuming 850s aren't as warm as the 18z GFS.

Look at the IAD sounding. It's not the surface temps or 850 temps that are the problem, it's the temps in between. They are really warm.

Link to comment
Share on other sites

Don't ever use FDK obs. In the history of that site, it has never been remotely correct. It's 36.8 at about 60' higher elevation (not that the 60' makes a difference) where I am...

well it's saturated which indicates something is amiss if nothing else.

also dca was 46 last hour.. 49 was 2 ago.

Link to comment
Share on other sites

Don't ever use FDK obs. In the history of that site, it has never been remotely correct. It's 36.8 at about 60' higher elevation (not that the 60' makes a difference) where I am...

yes, it is quite the outlier at times. I will say though that it has some backup tonight. When KFDK reported 36 degrees, my home station (Davis Vantage Vue) said 42F. I figured it was another error but as I was coming through downtown around East St, my car read 35F. When I got home 3 miles away, my car read 40F when my Davis said 41F. Odd...I'm at a higher elevation so maybe there is some inversion going on over a couple hundred feet? Either way, I'm sitting at 40.9F at 9:20 PM as are other local stations near me. Many are in the low 30s including the MDDOT station about 6 miles from me (and we're often the same temp).

Link to comment
Share on other sites

yes, it is quite the outlier at times. I will say though that it has some backup tonight. When KFDK reported 36 degrees, my home station (Davis Vantage Vue) said 42F. I figured it was another error but as I was coming through downtown around East St, my car read 35F. When I got home 3 miles away, my car read 40F when my Davis said 41F. Odd...I'm at a higher elevation so maybe there is some inversion going on over a couple hundred feet? Either way, I'm sitting at 40.9F at 9:20 PM as are other local stations near me. Many are in the low 30s including the MDDOT station about 6 miles from me (and we're often the same temp).

The IAd sounding showed a pretty pronounced inversion so what you were seeing is probably real. I see that alot around where I live.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...