Alert archive / Virginia / Mesoscale Discussions in 2013

Mesoscale Discussion 1297

June 28, 20135 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2013, 6:47 PM EDT for 5 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2013, 6:47 PM EDT (22:47 UTC)
Expired: Jun 28, 2013, 7:45 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center

All 52 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Calvert County, MD, Caroline County, MD, Dorchester County, MD, Kent County, MD, Prince George's County, MD, Queen Anne's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Johnston County, NC, Lee County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Wake County, NC, Wilson County, NC, Atlantic County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Accomack County, VA, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Gloucester County, VA, Isle of Wight County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, Northampton County, VA, Northumberland County, VA, Southampton County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 45 km from the middle of the area, began a volume at 22:47 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.8 hours before the alert went out and 178 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: 34 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1246 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 70 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.

Issued	Product	Office	Counties	Lasted
Jun 28, 2:08 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	7 hr
Jun 28, 3:30 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	2 hr
Jun 28, 1:02 PM EDT	Mesoscale Discussion	SPC	Allegany, Baltimore, Carroll, Frederick, Garrett, Harford and 4 more	118 min
Jun 28, 1:09 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Frederick, Garrett, Washington	7 hr
Jun 28, 7:11 PM EDT	Mesoscale Discussion	SPC	Allegany, Frederick, Garrett, Washington	64 min
Jun 28, 1:46 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Cabarrus, Caswell, Chatham, Cumberland and 33 more	89 min
Jun 28, 2:51 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Caswell, Chatham, Davidson, Durham, Edgecombe and 18 more	7 hr
Jun 28, 4:42 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Anson, Avery, Bertie, Buncombe and 61 more	93 min

Nearby

Mesoscale Discussions in Virginia, 2013 Mesoscale Discussions in North Carolina, 2013 Mesoscale Discussions in Maryland, 2013 Every mesoscale discussion in 2013

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.