Alert archive / Virginia / Mesoscale Discussions in 2015

Mesoscale Discussion 1184

June 25, 201526 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 10:11 PM EDT for 26 counties in Virginia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2015, 10:11 PM EDT (02:11 UTC)
Expired: Jun 25, 2015, 11:15 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 26 counties

Amelia County, VA, Brunswick County, VA, Buckingham County, VA, Charles City County, VA, Chesterfield County, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Petersburg, VA, City of Richmond, VA, Cumberland County, VA, Dinwiddie County, VA, Fluvanna County, VA, Goochland County, VA, Greensville County, VA, Hanover County, VA, Henrico County, VA, Lunenburg County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Norfolk radar (KAKQ), 73 km from the middle of the area, began a volume at 02:12 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

Roanoke, VA (KRNK), launched 00:00Z, 2.2 hours before the alert went out and 157 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 195 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1863 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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.

Issued	Product	Office	Counties	Lasted
Jun 25, 11:05 PM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson	85 min
Jun 25, 11:27 PM EDT	Mesoscale Discussion	SPC	Amelia, Brunswick, Charles City, Chesterfield, Dinwiddie, Gloucester and 25 more	63 min
Jun 26, 5:17 PM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson, Lee, Scott, Wise, City of Norton	28 min
Jun 26, 5:42 PM EDT	Severe Thunderstorm Watch	SPC	Buchanan, Dickenson, Lee, Russell, Scott, Smyth and 5 more	8 hr

Nearby

Mesoscale Discussions in Virginia, 2015 Every mesoscale discussion in 2015

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.