Alert archive / Virginia / Mesoscale Discussions in 2015

Mesoscale Discussion 1187

June 25, 20158 counties in North Carolina; 31 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 11:27 PM EDT for 8 counties in North Carolina; 31 counties in Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2015, 11:27 PM EDT (03:27 UTC)
Expired: Jun 26, 2015, 12:30 AM EDT
In force: 63 min
Issued by: the Storm Prediction Center

All 39 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Gates County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Amelia County, VA, Brunswick County, VA, Charles City County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, New Kent County, VA, Nottoway County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 24 km from the middle of the area, began a volume at 03:29 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

Newport, NC (KMHX), launched 00:00Z, 3.5 hours before the alert went out and 221 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: 2064 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 919 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 26, 3:29 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Anson, Beaufort, Bertie, Bladen and 63 more	2 hr
Jun 26, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Beaufort, Carteret, Chatham, Craven, Cumberland and 35 more	6 hr
Jun 26, 5:48 PM EDT	Mesoscale Discussion	SPC	Buncombe, Cherokee, Clay, Graham, Haywood, Henderson and 6 more	87 min
Jun 26, 6:11 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bladen, Carteret, Chatham, Craven, Cumberland and 24 more	94 min
Jun 25, 10:11 PM EDT	Mesoscale Discussion	SPC	Amelia, Brunswick, Buckingham, Charles City, Chesterfield, Cumberland and 20 more	64 min
Jun 25, 11:05 PM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson	85 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 Mesoscale Discussions in North Carolina, 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.