Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 65, NWS State College, PA

June 7, 1999Montour County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 7, 1999, 4:11 PM EDT for Montour County, Pennsylvania. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 7, 1999, 4:11 PM EDT (20:11 UTC)
Expired
Jun 7, 1999, 5:00 PM EDT
In force
49 min
Issued by
NWS State College, PA
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Montour County, PA

What was reported inside it

TimeReportWhereRemark
Jun 7, 4:18 PM EDTHail 0.75Exchange, PADime size hail fell in Exchange.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.2 hours before the alert went out and 180 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, Phillips Aaf/Abe, MD at 12:00Z on 1999-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Phillips Aaf/Abe, MD at 12:00Z on 1999-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1561 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 1:16 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren44 min
Jun 7, 2:09 PM EDTSevere Thunderstorm WarningCTPMcKean36 min
Jun 7, 2:25 PM EDTSevere Thunderstorm WarningCTPClinton65 min
Jun 7, 2:32 PM EDTSevere Thunderstorm WarningCTPTioga58 min
Jun 7, 2:57 PM EDTSevere Thunderstorm WarningCTPLycoming63 min
Jun 7, 3:01 PM EDTSevere Thunderstorm WarningCTPClearfield59 min
Jun 7, 3:30 PM EDTSevere Thunderstorm WarningCTPTioga45 min
Jun 7, 4:11 PM EDTSevere Thunderstorm WarningCTPNorthumberland, Union49 min
Jun 7, 4:26 PM EDTSevere Thunderstorm WarningCTPTioga49 min
Jun 7, 4:31 PM EDTSevere Thunderstorm WarningCTPColumbia, Lycoming59 min
Jun 7, 4:58 PM EDTSevere Thunderstorm WarningCTPMontour32 min
Jun 7, 5:42 PM EDTSevere Thunderstorm WarningCTPSchuylkill48 min
Jun 7, 6:30 PM EDTSevere Thunderstorm WarningCTPNorthumberland60 min
Jun 7, 6:35 PM EDTSevere Thunderstorm WarningCTPColumbia40 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.