Alert archive / Pennsylvania / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 694
The Storm Prediction Center issued this severe thunderstorm watch at Aug 16, 1997, 7:30 PM EDT for 26 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 1997, 7:30 PM EDT (23:30 UTC)
- Expired
- Aug 17, 1997, 12:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 30 counties
Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Fayette County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Mifflin County, PA, Somerset County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV
The radar
The Pittsburgh radar (KPBZ), 61 km from the middle of the area, began a volume at 23:33 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.
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:35 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence | 55 min |
| Aug 16, 7:42 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 63 min |
| Aug 16, 8:01 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 64 min |
| Aug 16, 8:14 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 61 min |
| Aug 16, 8:18 PM EDT | Severe Thunderstorm Warning | PBZ | Hancock | 57 min |
| Aug 16, 8:24 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong | 66 min |
| Aug 16, 8:42 PM EDT | Severe Thunderstorm Warning | PBZ | Brooke | 33 min |
| Aug 16, 8:45 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 90 min |
| Aug 16, 8:48 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 27 min |
| Aug 16, 8:50 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 60 min |
| Aug 16, 8:57 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 53 min |
| Aug 16, 9:08 PM EDT | Severe Thunderstorm Warning | PBZ | Marshall, Ohio | 67 min |
| Aug 16, 9:15 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 2 hr |
| Aug 16, 9:28 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 2 hr |
| Aug 16, 9:34 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 26 min |
| Aug 16, 10:05 PM EDT | Severe Thunderstorm Warning | CTP | Mifflin | 50 min |
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 11.5 hours before the alert went out and 49 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
- 2423 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 591 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 8:15 AM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 4 hr |
| Aug 16, 11:00 AM EDT | Severe Thunderstorm Watch | SPC | Bradford, Cameron, Clarion, Clinton, Crawford, Elk and 12 more | 6 hr |
| Aug 16, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bradford, Bucks, Carbon, Columbia, Dauphin and 21 more | 6 hr |
| Aug 16, 4:15 PM EDT | Severe Thunderstorm Watch | SPC | Butler, Clarion, Crawford, Erie, Lawrence, Mercer and 1 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 1997Severe Thunderstorm Watches in West Virginia, 1997Every severe thunderstorm watch in 1997
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.