Alert archive / Virginia / Mesoscale Discussions in 2003

Mesoscale Discussion 2283

August 27, 20035 states

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2003, 9:23 AM EDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 27, 2003, 9:23 AM EDT (13:23 UTC)
Expired: Aug 27, 2003, 11:30 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 82 counties

Kent County, DE, Sussex County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Washington County, MD, Wicomico County, MD, Worcester County, MD, Adams County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Centre County, PA, Cumberland County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA, Somerset County, PA, York County, PA, Accomack County, VA, Arlington County, VA, Caroline County, VA, City of Alexandria, 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 Winchester, VA, Clarke County, VA, Culpeper County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Northumberland County, VA, Orange County, VA, Page 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, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV, Preston County, WV, Tucker County, WV

The radar

The Sterling radar (KLWX), 47 km from the middle of the area, began a volume at 13:23 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 1.4 hours before the alert went out and 41 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: 483 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 1264 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 71 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
Aug 27, 6:56 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	64 min
Aug 27, 7:30 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	4 hr
Aug 26, 9:20 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Garrett	6 hr
Aug 26, 10:18 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett	57 min
Aug 27, 12:22 AM EDT	Mesoscale Discussion	SPC	Charles	53 min
Aug 27, 6:11 AM EDT	Mesoscale Discussion	SPC	Allegany, Garrett, Washington	2 hr
Aug 27, 9:40 AM EDT	Severe Thunderstorm Watch	SPC	Harford	5 hr
Aug 27, 10:35 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	5 hr
Aug 27, 2:10 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	65 min
Aug 27, 3:09 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Frederick and 7 more	66 min
Aug 27, 3:30 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 9 more	7 hr
Aug 27, 5:03 PM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more	87 min
Aug 27, 11:48 AM EDT	Mesoscale Discussion	SPC	Adams, Allegheny, Beaver, Bedford, Cambria, Columbia and 18 more	87 min
Aug 27, 2:05 PM EDT	Severe Thunderstorm Watch	SPC	Fayette, Greene, Washington, Westmoreland	5 hr
Aug 27, 12:52 PM EDT	Mesoscale Discussion	SPC	Barbour, Braxton, Cabell, Calhoun, Clay, Doddridge and 16 more	113 min

Nearby

Mesoscale Discussions in Virginia, 2003 Mesoscale Discussions in Maryland, 2003 Mesoscale Discussions in Pennsylvania, 2003 Every mesoscale discussion in 2003

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.