Alert archive / West Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1435

July 8, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2012, 1:29 PM EDT for 4 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2012, 1:29 PM EDT (17:29 UTC)
Expired
Jul 8, 2012, 2:30 PM EDT
In force
61 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 49 counties

Boyd County, KY, Lawrence County, KY, Martin County, KY, Garrett County, MD, Gallia County, OH, Lawrence County, OH, Meigs County, OH, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Greenbrier County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Mason County, WV, Mineral County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pendleton County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 45 km from the middle of the area, began a volume at 17:32 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 5.5 hours before the alert went out and 214 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, Roanoke, VA at 12:00Z on 2012-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 223 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, Roanoke, VA at 12:00Z on 2012-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939Sfc1 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
223 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
1600 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 1:14 PM EDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Bracken, Bullitt and 29 more91 min
Jul 8, 1:44 PM EDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence8 hr
Jul 8, 2:48 PM EDTSevere Thunderstorm WatchSPCAnderson, Bath, Boone, Bourbon, Boyle, Bracken and 56 more6 hr
Jul 8, 4:41 PM EDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyle, Bracken and 55 more64 min
Jul 8, 7:08 PM EDTMesoscale DiscussionSPCAdair, Allen, Ballard, Barren, Bath, Bourbon and 78 more3 hr
Jul 8, 12:47 PM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Caroline, Charles, Dorchester, Frederick and 11 more88 min
Jul 8, 4:21 PM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Caroline, Charles, Dorchester, Howard and 10 more54 min
Jul 8, 6:00 PM EDTMesoscale DiscussionSPCDorchester, Saint Mary's, Somerset, Wicomico, Worcester60 min

Nearby

Mesoscale Discussions in West Virginia, 2012Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Ohio, 2012Every mesoscale discussion in 2012

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.