Alert archive / Virginia / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 488

June 17, 20047 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2004, 2:35 PM EDT for 7 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 17, 2004, 2:35 PM EDT (18:35 UTC)
Expired: Jun 17, 2004, 9:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 110 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, Somerset County, MD, Talbot County, MD, Washington County, MD, Wicomico County, MD, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, York County, PA, Arlington County, VA, Caroline County, VA, Charles City County, VA, City of Alexandria, 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, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Hanover County, VA, Henrico County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Orange County, VA, Page County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Hardy County, WV, Jefferson County, WV

The radar

The Sterling radar (KLWX), 99 km from the middle of the area, began a volume at 18:34 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.

Warnings issued inside it

31 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 17, 2:37 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Jun 17, 2:40 PM EDT	Severe Thunderstorm Warning	PHI	Chester	50 min
Jun 17, 3:09 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore	66 min
Jun 17, 3:27 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	93 min
Jun 17, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	31 min
Jun 17, 3:47 PM EDT	Tornado Warning	CTP	Lancaster	73 min
Jun 17, 4:02 PM EDT	Severe Thunderstorm Warning	OKX	Nassau	43 min
Jun 17, 6:13 PM EDT	Flash Flood Warning	LWX	Prince William, City of Manassas, City of Manassas Park	4 hr
Jun 17, 6:27 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	33 min
Jun 17, 6:30 PM EDT	Severe Thunderstorm Warning	LWX	Prince William	45 min
Jun 17, 6:33 PM EDT	Flash Flood Warning	LWX	Prince George's	4 hr
Jun 17, 6:36 PM EDT	Severe Thunderstorm Warning	LWX	Charles	39 min
Jun 17, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	30 min
Jun 17, 6:52 PM EDT	Flash Flood Warning	LWX	Anne Arundel	83 min
Jun 17, 7:03 PM EDT	Tornado Warning	LWX	Charles	57 min
Jun 17, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	52 min
Jun 17, 7:20 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	55 min
Jun 17, 7:21 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	54 min
Jun 17, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	30 min
Jun 17, 7:36 PM EDT	Flash Flood Warning	LWX	Calvert	114 min
Jun 17, 7:40 PM EDT	Flash Flood Warning	OKX	Hudson	65 min
Jun 17, 7:47 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	58 min
Jun 17, 7:55 PM EDT	Flash Flood Warning	LWX	Charles	2 hr
Jun 17, 8:06 PM EDT	Flash Flood Warning	LWX	Saint Mary's	114 min
Jun 17, 8:08 PM EDT	Severe Thunderstorm Warning	AKQ	Dorchester	22 min
Jun 17, 8:12 PM EDT	Severe Thunderstorm Warning	PHI	Chester	33 min
Jun 17, 8:13 PM EDT	Flash Flood Warning	LWX	Anne Arundel	2 hr
Jun 17, 8:20 PM EDT	Flash Flood Warning	PHI	New Castle	93 days
Jun 17, 8:30 PM EDT	Severe Thunderstorm Warning	AKQ	Somerset	30 min
Jun 17, 8:38 PM EDT	Flash Flood Warning	OKX	Nassau, Queens	2 hr
Jun 17, 8:45 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	30 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 32 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: 456 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 4:22 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	83 min
Jun 17, 7:37 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	53 min
Jun 17, 12:05 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 33 more	115 min
Jun 17, 1:45 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Bedford, Blair, Bradford and 40 more	6 hr

Nearby

Severe Thunderstorm Watches in Virginia, 2004 Severe Thunderstorm Watches in Maryland, 2004 Severe Thunderstorm Watches in New Jersey, 2004 Every severe thunderstorm watch 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.