Alert archive / West Virginia / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 451
The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2009, 9:56 PM EDT for 7 counties in Ohio; 5 counties in Pennsylvania; 28 counties in West Virginia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2009, 9:56 PM EDT (01:56 UTC)
- Expired
- Jun 18, 2009, 1:00 AM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 40 counties
Belmont County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Noble County, OH, Washington County, OH, Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Brooke County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Harrison County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Ohio County, WV, Pendleton County, WV, Pleasants County, WV, Preston County, WV, Randolph County, WV, Ritchie County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV
The radar
The Pittsburgh radar (KPBZ), 88 km from the middle of the area, began a volume at 01:56 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 10:03 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 42 min |
| Jun 17, 10:09 PM EDT | Tornado Warning | PBZ | Belmont | 66 min |
| Jun 17, 10:10 PM EDT | Tornado Warning | PBZ | Fayette | 35 min |
| Jun 17, 10:24 PM EDT | Severe Thunderstorm Warning | PBZ | Belmont, Monroe | 36 min |
| Jun 17, 10:32 PM EDT | Tornado Warning | PBZ | Belmont, Monroe | 43 min |
| Jun 17, 10:42 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Washington | 41 min |
| Jun 17, 10:46 PM EDT | Flash Flood Warning | PBZ | Belmont | 3 hr |
| Jun 17, 10:56 PM EDT | Flash Flood Warning | PBZ | Allegheny, Armstrong, Fayette, Indiana, Westmoreland | 3 hr |
| Jun 17, 11:08 PM EDT | Tornado Warning | PBZ | Greene | 67 min |
| Jun 17, 11:12 PM EDT | Severe Thunderstorm Warning | LWX | Hampshire, Mineral | 48 min |
| Jun 17, 11:36 PM EDT | Tornado Warning | LWX | Hampshire | 39 min |
| Jun 18, 12:00 AM EDT | Severe Thunderstorm Warning | LWX | Hampshire | 45 min |
| Jun 18, 12:06 AM EDT | Severe Thunderstorm Warning | LWX | Mineral | 39 min |
| Jun 18, 12:12 AM EDT | Flash Flood Warning | LWX | Mineral | 3 hr |
| Jun 18, 12:42 AM EDT | Flash Flood Warning | LWX | Hampshire | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.9 hours before the alert went out and 266 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
- 1080 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1336 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 9.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 9:31 PM EDT | Mesoscale Discussion | SPC | Belmont, Guernsey, Harrison, Jefferson, Monroe, Noble | 59 min |
| Jun 18, 11:40 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more | 95 min |
Nearby
Severe Thunderstorm Watches in West Virginia, 2009Severe Thunderstorm Watches in Ohio, 2009Severe Thunderstorm Watches in Pennsylvania, 2009Every severe thunderstorm watch in 2009
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.