Alert archive / Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 925

May 26, 20046 counties in Maryland; 39 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 8:19 PM EDT for 6 counties in Maryland; 39 counties in Virginia. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 26, 2004, 8:19 PM EDT (00:19 UTC)
Expired: May 26, 2004, 10:15 PM EDT
In force: 116 min
Issued by: the Storm Prediction Center

All 45 counties

Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Charles County, MD, City of Baltimore, MD, Prince George's County, MD, Amelia County, VA, Arlington County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Petersburg, VA, City of Richmond, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lunenburg County, VA, Mecklenburg County, VA, New Kent County, VA, Nottoway County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Spotsylvania County, VA, Stafford County, VA, Sussex County, VA, Westmoreland County, VA

The radar

The Norfolk radar (KAKQ), 121 km from the middle of the area, began a volume at 00:21 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 303May 26, 9:15 PM EDT

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 0.3 hours before the alert went out and 141 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 241 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
May 27, 3:07 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 7 more	113 min
May 26, 9:15 PM EDT	Severe Thunderstorm Watch	SPC	Accomack, Charles City, Gloucester, Greensville, Isle of Wight, James City and 23 more	5 hr
May 26, 11:21 PM EDT	Mesoscale Discussion	SPC	Northampton, City of Chesapeake, City of Norfolk, City of Virginia Beach	54 min
May 27, 3:28 AM EDT	Mesoscale Discussion	SPC	Grayson, Lee, Russell, Scott, Smyth, Washington and 2 more	92 min

Nearby

Mesoscale Discussions in Virginia, 2004 Mesoscale Discussions in Maryland, 2004 Every mesoscale discussion in 2004

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.