Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 346, NWS Pittsburgh, PA

September 27, 1998Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 27, 1998, 4:13 PM EDT for Jefferson County, Pennsylvania. It was in force for 42 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
Sep 27, 1998, 4:13 PM EDT (20:13 UTC)
Expired
Sep 27, 1998, 4:55 PM EDT
In force
42 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Jefferson County, PA

The radar

The State College radar (KCCX), 87 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 122 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 1998-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 1998-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1444 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
27 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 Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 27, 5:49 PM EDTSevere Thunderstorm WarningPBZCoshocton31 min
Sep 27, 6:03 PM EDTSevere Thunderstorm WarningPBZMuskingum42 min
Sep 27, 6:20 PM EDTSevere Thunderstorm WarningPBZGuernsey45 min
Sep 27, 3:52 PM EDTSevere Thunderstorm WarningPBZClarion58 min
Sep 27, 4:25 PM EDTSevere Thunderstorm WarningPBZMercer40 min
Sep 27, 4:50 PM EDTSevere Thunderstorm WarningPBZButler, Venango45 min
Sep 27, 5:16 PM EDTSevere Thunderstorm WarningPBZArmstrong44 min
Sep 27, 5:37 PM EDTTornado WarningPBZArmstrong, Clarion43 min
Sep 27, 5:58 PM EDTSevere Thunderstorm WarningPBZIndiana57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1998Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.