Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 261, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 21, 1998, 9:38 PM EDT for Clarion County, Forest County, Pennsylvania. It was in force for 62 min. 3 reports 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
- Jul 21, 1998, 9:38 PM EDT (01:38 UTC)
- Expired
- Jul 21, 1998, 10:40 PM EDT
- In force
- 62 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Clarion County, PA, Forest County, PA
The radar
The Pittsburgh radar (KPBZ), 118 km from the middle of the area, began a volume at 01:38 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 21, 9:55 PM EDT | Thunderstorm Wind | Countywide, PA | Numerous trees were downed throughout the county. |
| Jul 21, 10:40 PM EDT | Thunderstorm Wind | Tionesta, PA | Several trees were downed by thunderstorm winds. |
| Jul 21, 10:40 PM EDT | Thunderstorm Wind | Gultonville, PA | Several trees were downed by thunderstorm winds. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 21, 9:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 1.6 hours before the alert went out and 123 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.
- Mixed-layer CAPE
- 4348 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 803 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 13.1
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:15 PM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 60 min |
| Jul 21, 11:56 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton, Tuscarawas | 44 min |
| Jul 22, 12:10 AM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana | 40 min |
| Jul 22, 12:30 AM EDT | Severe Thunderstorm Warning | PBZ | Harrison | 64 min |
| Jul 22, 12:49 AM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 41 min |
| Jul 22, 1:00 AM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 20 min |
| Jul 21, 8:54 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 56 min |
| Jul 21, 9:25 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 60 min |
| Jul 21, 9:30 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 60 min |
| Jul 21, 9:40 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 60 min |
| Jul 21, 10:00 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Jefferson | |
| Jul 21, 10:22 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 58 min |
| Jul 21, 10:28 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 72 min |
| Jul 21, 10:29 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 21 min |
| Jul 21, 11:42 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 58 min |
| Jul 22, 12:43 AM EDT | Severe Thunderstorm Warning | PBZ | Lawrence, Mercer | 47 min |
| Jul 22, 12:54 AM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 46 min |
| Jul 22, 1:30 AM EDT | Severe Thunderstorm Warning | PBZ | Butler | 60 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.