Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 676

April 23, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2005, 12:35 PM EDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2005, 12:35 PM EDT (16:35 UTC)
Expired: Apr 23, 2005, 2:30 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center

All 56 counties

Carroll County, MD, Charles County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Bedford County, PA, Fulton County, PA, Albemarle County, VA, Amelia County, VA, Appomattox County, VA, Arlington County, VA, Buckingham County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Colonial Heights, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Richmond, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Cumberland County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Henrico County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, New Kent County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince William County, VA, Rappahannock County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 89 km from the middle of the area, began a volume at 16:35 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.

Severe Thunderstorm Watch 200Apr 23, 1:10 PM EDT

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.6 hours before the alert went out and 92 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, 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 23, 4:26 PM EDT	Mesoscale Discussion	SPC	Caroline, Cecil, Dorchester, Kent, Queen Anne's, Saint Mary's and 4 more	94 min
Apr 23, 7:16 PM EDT	Mesoscale Discussion	SPC	Calvert, Caroline, Cecil, Dorchester, Harford, Kent and 6 more	59 min
Apr 22, 8:59 PM EDT	Mesoscale Discussion	SPC	Scott, City of Bristol, City of Norton	31 min
Apr 22, 9:05 PM EDT	Severe Thunderstorm Watch	SPC	Buchanan, Dickenson, Lee, Russell, Scott, Wise and 2 more	4 hr
Apr 22, 11:18 PM EDT	Mesoscale Discussion	SPC	Scott, City of Bristol	57 min
Apr 22, 10:25 PM EDT	Mesoscale Discussion	SPC	Boone, Cabell, Calhoun, Clay, Doddridge, Gilmer and 15 more	95 min

Nearby

Mesoscale Discussions in Virginia, 2005 Mesoscale Discussions in Maryland, 2005 Mesoscale Discussions in West Virginia, 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.