Alert archive / Pennsylvania / Lake Effect Snow Warnings in 2017
Lake Effect Snow Warning 1, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this lake effect snow warning at Dec 11, 2017, 12:05 PM EST for Clarion County, Forest County, Venango County, Pennsylvania. It took effect at Dec 12, 2017, 7:00 AM EST. It was in force for 22 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 11, 2017, 12:05 PM EST (17:05 UTC)
- In effect from
- Dec 12, 2017, 7:00 AM EST
- Expired
- Dec 13, 2017, 4:32 AM EST
- In force
- 22 hr
- Issued by
- NWS Pittsburgh, PA
Counties Clarion County, PA, Forest County, PA, Venango County, PA
The radar
The Pittsburgh radar (KPBZ), 112 km from the middle of the area, began a volume at 17:08 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 (KAGC), launched 12:00Z, 5.1 hours before the alert went out and 119 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
- 959 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this lake effect snow warning 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 lake effect snow warning went out at Dec 11, 11:54 AM EST, 11 minutes earlier.
Area forecast discussion, Dec 11, 11:54 AM EST, 11 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 11, 12:05 PM EST | Winter Weather Advisory | PBZ | Fayette, Jefferson, Mercer, Westmoreland | 39 hr |
| Dec 11, 12:05 PM EST | Wind Chill Advisory | PBZ | Preston, Tucker | 48 hr |
Nearby
Lake Effect Snow Warnings in Pennsylvania, 2017Every lake effect snow warning in 2017
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.