Alert archive / Pennsylvania / Tornado Warnings in 1998

Tornado Warning 55, NWS State College, PA

July 21, 1998Columbia County, Pennsylvania

NWS State College, PA issued this tornado warning at Jul 21, 1998, 1:24 PM EDT for Columbia County, Pennsylvania. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 21, 1998, 1:24 PM EDT (17:24 UTC)
Expired
Jul 21, 1998, 2:20 PM EDT
In force
56 min
Issued by
NWS State College, PA
Area
Whole counties

County Columbia County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.4 hours before the alert went out and 177 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 1998-07-21Temperature 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 1998-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
1435 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
110 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
Jul 21, 9:56 AM EDTSevere Thunderstorm WarningCTPPotter64 min
Jul 21, 10:48 AM EDTSevere Thunderstorm WarningCTPTioga62 min
Jul 21, 11:01 AM EDTTornado WarningCTPTioga64 min
Jul 21, 11:43 AM EDTSevere Thunderstorm WarningCTPLycoming, Sullivan67 min
Jul 21, 11:43 AM EDTSevere Thunderstorm WarningCTPLycoming, Sullivan62 min
Jul 21, 12:42 PM EDTSevere Thunderstorm WarningCTPColumbia63 min
Jul 21, 1:17 PM EDTTornado WarningCTPColumbia63 min
Jul 21, 4:11 PM EDTSevere Thunderstorm WarningCTPSomerset74 min
Jul 21, 4:36 PM EDTSevere Thunderstorm WarningCTPBedford59 min
Jul 21, 4:53 PM EDTSevere Thunderstorm WarningCTPFulton32 min
Jul 21, 4:55 PM EDTSevere Thunderstorm WarningCTPFulton30 min
Jul 21, 5:21 PM EDTSevere Thunderstorm WarningCTPLebanon19 min
Jul 21, 6:11 PM EDTSevere Thunderstorm WarningCTPLancaster34 min

Nearby

Tornado Warnings in Pennsylvania, 1998Every tornado warning in 1998Tornadoes in 1998

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.