Alert archive / Pennsylvania / Mesoscale Discussions in 2005
Mesoscale Discussion 1869
The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 6:21 PM EDT for 5 counties in Pennsylvania; Monongalia County, Preston County, West Virginia. It was in force for 24 min.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 2005, 6:21 PM EDT (22:21 UTC)
- Expired
- Jul 25, 2005, 6:45 PM EDT
- In force
- 24 min
- Issued by
- the Storm Prediction Center
Counties Armstrong County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Westmoreland County, PA, Monongalia County, WV, Preston County, WV
The radar
The Pittsburgh radar (KPBZ), 64 km from the middle of the area, began a volume at 22:21 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, 10.4 hours before the alert went out and 47 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
- 2202 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 641 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 7.7
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 11:28 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 12 more | 92 min |
| Jul 24, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | Clarion, Crawford, Forest, Jefferson, Mercer, Venango and 1 more | 4 hr |
| Jul 25, 12:57 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Fayette, Greene, Lawrence and 2 more | 93 min |
| Jul 25, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more | 5 hr |
| Jul 25, 5:33 PM EDT | Mesoscale Discussion | SPC | Somerset | 57 min |
| Jul 25, 6:00 PM EDT | Severe Thunderstorm Watch | SPC | Franklin, Fulton | 3 hr |
| Jul 25, 7:34 PM EDT | Mesoscale Discussion | SPC | Franklin, Fulton | 56 min |
| Jul 25, 3:13 PM EDT | Mesoscale Discussion | SPC | Pleasants, Ritchie, Wirt, Wood | 92 min |
| Jul 25, 4:45 PM EDT | Severe Thunderstorm Watch | SPC | Barbour, Boone, Braxton, Cabell, Calhoun, Clay and 25 more | 4 hr |
| Jul 25, 7:09 PM EDT | Mesoscale Discussion | SPC | Boone, Cabell, Clay, Fayette, Greenbrier, Kanawha and 9 more | 66 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2005Mesoscale Discussions in West Virginia, 2005Every mesoscale discussion in 2005
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.