Alert archive / Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 943

May 27, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2004, 3:07 PM EDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 27, 2004, 3:07 PM EDT (19:07 UTC)
Expired: May 27, 2004, 5:00 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center

All 69 counties

Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Adams County, PA, Franklin County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, Buckingham County, VA, Caroline County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Richmond, VA, City of Staunton, VA, City of Waynesboro, 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, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Nelson County, VA, Northumberland County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 47 km from the middle of the area, began a volume at 19:10 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.1 hours before the alert went out and 167 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: 964 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -85 m²/s²
0-3 km storm-relative helicity: 39 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 26, 8:19 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, City of Baltimore	116 min
May 27, 5:45 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Fayette, Greene, Washington	5 hr
May 27, 7:13 PM EDT	Mesoscale Discussion	SPC	Greene, Washington	92 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
May 27, 5:14 PM EDT	Mesoscale Discussion	SPC	Brooke, Doddridge, Hancock, Marshall, Ohio, Pleasants and 5 more	91 min
May 27, 7:35 PM EDT	Mesoscale Discussion	SPC	Boone, Braxton, Cabell, Calhoun, Clay, Fayette and 13 more	25 min
May 27, 7:55 PM EDT	Tornado Watch	SPC	Barbour, Braxton, Cabell, Calhoun, Clay, Doddridge and 19 more	5 hr

Nearby

Mesoscale Discussions in Virginia, 2004 Mesoscale Discussions in Maryland, 2004 Mesoscale Discussions in West Virginia, 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.