Alert archive / Pennsylvania / Winter Storm Watches in 2012
Winter Storm Watch 3, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this winter storm watch at Apr 21, 2012, 2:55 PM EDT for 12 counties in Pennsylvania. It took effect at Apr 23, 2012, 12:00 AM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 21, 2012, 2:55 PM EDT (18:55 UTC)
- In effect from
- Apr 23, 2012, 12:00 AM EDT
- Expired
- Apr 22, 2012, 2:27 PM EDT
- In force
- Issued by
- NWS Pittsburgh, PA
Counties Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 57 km from the middle of the area, began a volume at 18:59 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 6.9 hours before the alert went out and 61 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 464 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before this winter storm watch went out at Apr 21, 11:02 AM EDT, 3 hours 53 minutes earlier.
Area forecast discussion, Apr 21, 11:02 AM EDT, 3 hours 53 minutes before
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</html>Hazardous weather outlook, Apr 21, 9:31 AM EDT, 5 hours 24 minutes before
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</html>Nearby
Winter Storm Watches in Pennsylvania, 2012Winter Storm Watches in West Virginia, 2012Every winter storm watch in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.