Alert archive / Pennsylvania / Freeze Watches in 2012

Freeze Watch 2, NWS State College, PA

March 29, 201211 counties in Pennsylvania

NWS State College, PA issued this freeze watch at Mar 29, 2012, 5:34 AM EDT for 11 counties in Pennsylvania. It took effect at Mar 30, 2012, 3:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Mar 29, 2012, 5:34 AM EDT (09:34 UTC)
In effect from
Mar 30, 2012, 3:00 AM EDT
Expired
Mar 29, 2012, 2:17 PM EDT
In force
Issued by
NWS State College, PA

Counties Adams County, PA, Bedford County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Lancaster County, PA, Lebanon County, PA, Perry County, PA, Somerset County, PA, York County, PA

The radar

The State College radar (KCCX), 106 km from the middle of the area, began a volume at 09:31 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 9.6 hours before the alert went out and 127 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.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2012-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 350 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2012-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 253 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
350 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1644 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
253 m²/s²
0-3 km storm-relative helicity
323 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

Open this sounding in Storm Lab

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 29, 2:17 PM EDTFreeze WarningCTPAdams, Bedford, Cumberland, Dauphin, Franklin, Fulton and 5 more19 hr

Nearby

Freeze Watches in Pennsylvania, 2012Every freeze 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.