Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 1891

July 27, 20057 states

The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2005, 3:35 PM EDT for 7 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 27, 2005, 3:35 PM EDT (19:35 UTC)
Expired: Jul 27, 2005, 5:30 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center

All 96 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick 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, Talbot County, MD, Washington County, MD, Wicomico County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Union County, NJ, Kings County, NY, Nassau County, NY, Queens County, NY, Richmond County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta 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 Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 31 km from the middle of the area, began a volume at 19:35 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 27 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: 1151 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1456 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 87 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
Jul 27, 11:55 AM EDT	Mesoscale Discussion	SPC	Kent, New Castle	2 hr
Jul 27, 1:50 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	8 hr
Jul 27, 6:32 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	88 min
Jul 27, 1:10 PM EDT	Severe Thunderstorm Watch	SPC	Bergen, Passaic, Sussex	7 hr
Jul 27, 5:42 PM EDT	Mesoscale Discussion	SPC	Bergen, Passaic, Sussex	93 min
Jul 27, 3:08 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Delaware, Dutchess, Greene, Orange and 10 more	2 hr
Jul 27, 7:30 PM EDT	Mesoscale Discussion	SPC	Suffolk	30 min
Jul 26, 10:02 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 17 more	58 min

Nearby

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