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Central PA - February 2017


MAG5035

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18 minutes ago, paweather said:

Pingers in DC? WOW.

There's been flakes visible at times on the cameras on the I-70 corridor west of Frederick. Also snow on the ground and on the road I-68 starting just west of Cumberland, MD. I wish 511PA cams had the picture quality of the MD CHART ones instead of looking like they were broadcasting in "recorded with a potato" HD 

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25 minutes ago, MAG5035 said:

There's been flakes visible at times on the cameras on the I-70 corridor west of Frederick. Also snow on the ground and on the road I-68 starting just west of Cumberland, MD. I wish 511PA cams had the picture quality of the MD CHART ones instead of looking like they were broadcasting in "recorded with a potato" HD 

Definitely snowy in western MD

1-23-2017 2-46-21 PM.jpg

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36 minutes ago, MAG5035 said:

There's been flakes visible at times on the cameras on the I-70 corridor west of Frederick. Also snow on the ground and on the road I-68 starting just west of Cumberland, MD. I wish 511PA cams had the picture quality of the MD CHART ones instead of looking like they were broadcasting in "recorded with a potato" HD 

Thanks Mag.

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Also worth noting that dew point temperatures have been starting to fall across a portion of PA from northeast and spreading southwest with the wind flow - just have a feeling there will be a wintry surprise (even if its just a sleet/snow combo) in some areas with some elevation where current forecasts are for rain with little to no accumulation with a changeover.

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Pretty much almost all sleet now, with some wet flakes starting to mix in. Temp down to 35. The transistion is clearly evident on the CC dual pol product as the zone of lower CC values (mixing) is racing northward (down the column) up I-99 toward the CCX radar. Pretty cool to see. 

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I'm guessing we have an imminent NWS update coming because they've upped the snowfall in State College from 1-3 to 2-4

 

 

Rain before 7pm, then rain and snow between 7pm and 1am, then snow after 1am. Low around 32. Northeast wind 6 to 9 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

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10 minutes ago, Jmister said:

I'm guessing we have an imminent NWS update coming because they've upped the snowfall in State College from 1-3 to 2-4

 

 

Rain before 7pm, then rain and snow between 7pm and 1am, then snow after 1am. Low around 32. Northeast wind 6 to 9 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

It's probably going to be snowing before 7pm in State College as well, now mostly snow down the road here (not too heavy attm). I expect they'll eventually need the advisory for a tier or two into the central zones, but we need to keep up heavy rates at our lower elevation. Noticed the 12z Euro got it's 6+ zone all the way through the middle of the state into western MD. It's a little late in the game for globals but it did seem to up the QPF. 

 

15 minutes ago, Wmsptwx said:

Thinking it'll take solid elevation to see anything notable. NWS not seeing anything to pull trigger on headlines outside of northern tier and mountains.

.NEAR TERM /UNTIL 10 PM THIS EVENING/...
* Major cyclone to affect the region through tonight
* Elevation dependent snow storm likely
* Several inches of heavy wet snow not out of the question even
  throughout the Central Valley areas
* Strong easterly LLJ 50-65kt/5-7 sigma...translating to wind
  gusts of 35 to 45 mph near and to the east of the Susquehanna
  Mainstem
* High probability of at least 1" QPF over much of central PA
* Explosive dynamic cooling leads to steep mid level lapse rates
  and a few instances of thunder snow across the region late
  today and tonight

The deep storm that has been responsible for several rounds of
severe storms and deadly tornadoes over Dixie the past several
days, is now located near Norfolk, VA and will take a track
to the northeast up along or just off the NJ coast tonight.

Increasing upper diffluence and mid-level frontogenesis across
the Mid Atlantic Region will lead to bands of moderate to
briefly heavy precip pushing NWWD, then consolidating on a
roughly NE/SW axis near the front range of the Alleghenies from
near KELM...to KFIG and KUNV...to KAOO and KIDI late today
through at least the first half of tonight as the channel
anomalously high PWAT air and low-level easterly winds pivots
around the north side of the approaching, negative tilt Upper
Low.

Multi-model and EFS Vertical Thermal Profiles are very close to
supporting various types of precip...in various locations as
dynamic cooling lowers temps at all layers just below freezing
over the Laurel Highlands first late today, then across central
and NEPA where varying thickness of the slightly above freezing
layer of marine air off the Atlantic will be found.

We maintained the basic timing and configuration of the
previously posted Winter Storm Warning and Advisories for NCENT
PA, but issued a fresh Winter Weather Advisory for the Laurels
for late this afternoon through midnight where 2-4 inches is
expected in the valleys there, with higher amounts of 5-6 inches
on the ridge tops AOA 2200 FT MSL.

17Z HRRR shows the first batch of moderate to heavy QPF (in the
form of Rain to Sleet, with Laurel Highland Wet Snow) lifting
gradually north across the CWA between 21-02Z and becoming
concentrated across the northern tier counties of PA later
tonight. Elevated...slantwise instability coupled with
steepening mid/upr lapse rates moving in from the south should
lead to some isolated TSSN (or TS some precip type) through
at least early tonight.

A second surge of mid/upper level energy pushes NWWD over much
of central and eastern PA after midnight and lingers through
daybreak in the form of an "elongating" area of "Wraparound"
snow/sleet. The main change for later this evening may be the
need to extend the Winter Weather Advisory to fill in some of
the Central Susq Valley and Central Mtn zones for up to several
inches of Wet Snow.

Temperatures in most locations of Central and Northern PA will
be nearly steady or slowly falling from the mid and upper 30s
late today, The rain will mix with, then change to sleet and wet
snow during the mid to late afternoon across the higher terrain
of central and western PA where temps will be between 32 and
34F.

A gradual changeover to sleet and wet snow of varying intensity
will occur throughout the central valleys and northern mountains
between 5 and 7 pm.

PTYPE will be mainly rain across the Lower Susq Valley through
the first half of tonight, then a rain/wet snow mix with up to a
slushy 1 to 2 inches on the ridges around and to the north of
the Greater Harrisburg Area.
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WWA issued for southern Centre

 

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
422 PM EST MON JAN 23 2017

PAZ019-025-026-045-046-240930-
/O.EXA.KCTP.WW.Y.0004.000000T0000Z-170124T1200Z/
SOUTHERN CENTRE-BLAIR-HUNTINGDON-SOUTHERN CLINTON-
SOUTHERN LYCOMING-
INCLUDING THE CITIES OF STATE COLLEGE, ALTOONA, HUNTINGDON,
MOUNT UNION, LOCK HAVEN, AND WILLIAMSPORT
422 PM EST MON JAN 23 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW AND SLEET ACCUMULATION...WHICH IS
IN EFFECT UNTIL 7 AM EST TUESDAY.

HAZARDOUS WEATHER...

* RAIN AND SLEET WILL CHANGE TO MOSTLY SNOW BY EARLY EVENING AND FALL
  HEAVILY AT TIMES INTO EARLY TUESDAY MORNING.

* SNOW AND SLEET ACCUMULATIONS 2 TO 5 INCHES. SNOW WILL BE HEAVY AND WET
  WITH MAXIMUM AMOUNTS IN THE HIGHEST ELEVATIONS. LOWER AMOUNTS
  EXPECTED IN THE VALLEYS.

IMPACTS...

* HAZARDOUS TRAVEL ON SNOW COVERED ROADS. LONGER COMMUTE TIMES
  MONDAY EVENING AND TUESDAY MORNING. GUSTY WINDS AND HEAVY WET
  SNOW MAY RESULT IN ISOLATED POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PENNSYLVANIA DEPARTMENT OF TRANSPORTATION REMINDS MOTORISTS
TO ADJUST SPEEDS BASED ON DRIVING CONDITIONS AND TO TAKE IT SLOW
IN ICE AND SNOW.

&&
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