Alert archive / Pennsylvania / Frost Advisories in 2023

Frost Advisory 3, NWS State College, PA

April 24, 20238 counties in Pennsylvania

NWS State College, PA issued this frost advisory at Apr 24, 2023, 2:09 PM EDT for 8 counties in Pennsylvania. It took effect at Apr 24, 2023, 11:00 PM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Apr 24, 2023, 2:09 PM EDT (18:09 UTC)
In effect from
Apr 24, 2023, 11:00 PM EDT
Expired
Apr 25, 2023, 9:00 AM EDT
In force
10 hr
Issued by
NWS State College, PA

Counties Columbia County, PA, Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, Montour County, PA, Northumberland County, PA, Schuylkill County, PA, York County, PA

The radar

The State College radar (KCCX), 131 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 303 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, Pittsburgh, PA at 12:00Z on 2023-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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, Pittsburgh, PA at 12:00Z on 2023-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.19395878Sfc1 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
13 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
827 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 24, 3:14 AM EDTFreeze WatchCTPBedford, Blair, Cambria, Cameron, Centre, Clearfield and 8 more11 hr
Apr 24, 2:09 PM EDTFreeze WarningCTPAdams, Bedford, Blair, Cambria, Cameron, Centre and 15 more19 hr

Nearby

Frost Advisories in Pennsylvania, 2023Every frost advisory in 2023

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.