Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 679

April 23, 20056 states

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2005, 4:26 PM EDT for 6 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2005, 4:26 PM EDT (20:26 UTC)
Expired: Apr 23, 2005, 6:00 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center

All 52 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Kent County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Gates County, NC, Hertford County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Cumberland County, NJ, Salem County, NJ, Berks County, PA, Chester County, PA, Delaware County, PA, Accomack County, VA, City of Chesapeake, 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, City of Williamsburg, VA, Gloucester County, VA, Isle of Wight County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, Northampton County, VA, Northumberland County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 34 km from the middle of the area, began a volume at 20:29 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 hours before the alert went out and 231 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: 7 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 166 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
Apr 23, 7:16 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	59 min
Apr 23, 12:35 PM EDT	Mesoscale Discussion	SPC	Carroll, Charles, Frederick, Howard, Montgomery, Washington	115 min
Apr 23, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 7 more	7 hr
Apr 23, 3:17 PM EDT	Mesoscale Discussion	SPC	Calvert, Carroll, Charles, Frederick, Howard, Montgomery and 3 more	88 min
Apr 22, 9:05 PM EDT	Severe Thunderstorm Watch	SPC	Swain	4 hr
Apr 22, 8:59 PM EDT	Mesoscale Discussion	SPC	Scott, City of Bristol, City of Norton	31 min
Apr 22, 11:18 PM EDT	Mesoscale Discussion	SPC	Scott, City of Bristol	57 min

Nearby

Mesoscale Discussions in Virginia, 2005 Mesoscale Discussions in North Carolina, 2005 Mesoscale Discussions in Maryland, 2005 Every 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.