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Pittsburgh PA Winter 2016-2017


north pgh

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BOOM!

 

PAZ073-075-090315-
/O.EXA.KPBZ.WS.W.0001.170209T0000Z-170210T0000Z/
Westmoreland-Fayette-
Including the cities of Murrysville, Greensburg, New Kensington,
and Uniontown
211 PM EST Wed Feb 8 2017

...WINTER STORM WARNING IN EFFECT FROM 7 PM THIS EVENING TO 7 PM
EST THURSDAY...

The National Weather Service in Pittsburgh has issued a Winter
Storm Warning for snow...which is in effect from 7 PM this
evening to 7 PM EST Thursday.

* SNOW ACCUMULATIONS...6 to 8 inches.

* TIMING...the heaviest snow is expected late this evening into
  Thursday morning.

* IMPACTS...The heavy snow will make many roads impassable and
  may produce widespread power outages due to the weight of the
  snow on tree limbs and power lines.

* WINDS...Northwest 5 to 15 mph with gusts up to 25 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning means significant amounts of snow are
expected. This will make travel very hazardous.

Please report snowfall by calling 412-262-1988, posting to the
NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH
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3 minutes ago, north pgh said:

Shall someone call over there and make sure they are alright? :P

Looks like someone made the call

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pittsburgh PA
211 PM EST Wed Feb 8 2017

PAZ014>016-021-022-029-031-WVZ002>004-012-021-509-090315-
/O.NEW.KPBZ.WW.Y.0009.170209T0000Z-170209T1600Z/
Butler-Clarion-Jefferson-Allegheny-Armstrong-Washington-Greene-
Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia-
Including the cities of Butler, Clarion, Punxsutawney,
Brookville, Pittsburgh Metro Area, Kittanning, Ford City,
Washington, Canonsburg, Waynesburg, Follansbee, Wellsburg,
Wheeling, Moundsville, New Martinsville, Fairmont, and Morgantown
211 PM EST Wed Feb 8 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO
11 AM EST THURSDAY...

The National Weather Service in Pittsburgh has issued a Winter
Weather Advisory for snow...which is in effect from 7 PM this
evening to 11 AM EST Thursday.

* SNOW ACCUMULATIONS...4 to 6 inches.

* TIMING...the heaviest snow is expected late this evening into
  Thursday morning.

* IMPACTS...The heavy snow will create snow covered roads and
  produce scattered power outages.

* WINDS...North 10 to 15 mph with gusts up to 25 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means that periods of snow
will cause primarily travel difficulties. Be prepared for snow
covered roads and limited visibilities...and use caution while
driving.

Please report snowfall by calling 412-262-1988, posting to the
NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH

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.NEAR TERM /THROUGH THURSDAY/...
An enhancing shortwave trough digging through the Ohio Valley
will cause significant snowfall across parts of the forecast
area. It's quite rare to see such high QPF and snow amounts 
projected by all models with an open wave passing through the 
region...so have constructed the best possible forecast in 
collaboration with WPC and neighboring offices. Latest model 
runs have: the low level low developing over the southern zones,
significant moisture within the dendritic snow growth zone with
strong omega fields just below it, and a deformation zone over 
the southeast zones correlating with a depicted reflectivity 
snow band. In short, the perfect ingredients are in projection 
within model data to produce significant snowfall in the 6 to 12
hour time frame across parts of the area. Some localized areas 
may receive more or less depending on where the mesoscale 
band sets up. There will probably be a sharp cutoff oriented NE/SW
in snow amounts centralized around Allegheny county.

Temperatures in the southern half of the CWA are still warm but
projected to lower as colder air arrives with the precipitation.
Rain/snow will quickly switch over to all wet heavy snow
initially as dynamic cooling takes place. Expect the heaviest
snow to fall in the first 12 hours of the synoptic event.

The snow should shift east as the low translates towards the
east coast by Thursday morning but snow showers will quickly
develop via cold NW flow, increasing snow amounts over the area.
Thus, some of the headlines continue past the end of the 
synoptic event. Inversions should lower late Thursday and high 
pressure building in will help diminish snow showers.

Temperatures will fall toward the seasonal normal tonight, with
well below normal temperatures in cold northwest flow Thursday.
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8 minutes ago, Mailman said:

.NEAR TERM /THROUGH THURSDAY/...
An enhancing shortwave trough digging through the Ohio Valley
will cause significant snowfall across parts of the forecast
area. It's quite rare to see such high QPF and snow amounts 
projected by all models with an open wave passing through the 
region...so have constructed the best possible forecast in 
collaboration with WPC and neighboring offices. Latest model 
runs have: the low level low developing over the southern zones,
significant moisture within the dendritic snow growth zone with
strong omega fields just below it, and a deformation zone over 
the southeast zones correlating with a depicted reflectivity 
snow band. In short, the perfect ingredients are in projection 
within model data to produce significant snowfall in the 6 to 12
hour time frame across parts of the area. Some localized areas 
may receive more or less depending on where the mesoscale 
band sets up. There will probably be a sharp cutoff oriented NE/SW
in snow amounts centralized around Allegheny county.

Temperatures in the southern half of the CWA are still warm but
projected to lower as colder air arrives with the precipitation.
Rain/snow will quickly switch over to all wet heavy snow
initially as dynamic cooling takes place. Expect the heaviest
snow to fall in the first 12 hours of the synoptic event.

The snow should shift east as the low translates towards the
east coast by Thursday morning but snow showers will quickly
develop via cold NW flow, increasing snow amounts over the area.
Thus, some of the headlines continue past the end of the 
synoptic event. Inversions should lower late Thursday and high 
pressure building in will help diminish snow showers.

Temperatures will fall toward the seasonal normal tonight, with
well below normal temperatures in cold northwest flow Thursday.

Good discussion noting that without a closed 500 low, it's hard to get huge snow totals here. But also noting how this could really get thumping for a short period of time.

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