Alert archive / Pennsylvania / Freeze Warnings in 2009
Freeze Warning 2, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this freeze warning at May 18, 2009, 3:04 PM EDT for Forest County, Jefferson County, Pennsylvania. It took effect at May 19, 2009, 3:00 AM EDT. It was in force for 5 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
- May 18, 2009, 3:04 PM EDT (19:04 UTC)
- In effect from
- May 19, 2009, 3:00 AM EDT
- Expired
- May 19, 2009, 8:00 AM EDT
- In force
- 5 hr
- Issued by
- NWS Pittsburgh, PA
Counties Forest County, PA, Jefferson County, PA
The radar
The State College radar (KCCX), 103 km from the middle of the area, began a volume at 19:09 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, 7.1 hours before the alert went out and 131 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
- 1617 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 3:04 PM EDT | Frost Advisory | PBZ | Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 4 more | 17 hr |
Nearby
Freeze Warnings in Pennsylvania, 2009Every freeze warning in 2009
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.