Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 528

June 12, 20037 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2003, 1:20 PM EDT for 7 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 12, 2003, 1:20 PM EDT (17:20 UTC)
Expired: Jun 12, 2003, 8:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center

All 83 counties

Kent County, DE, New Castle County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, 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, Talbot County, MD, Washington County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester 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, Richmond County, NY, Adams County, PA, Bedford County, PA, Berks County, PA, Bucks County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Montgomery County, PA, Perry County, PA, Philadelphia County, PA, Somerset County, PA, Westmoreland County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Loudoun County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Shenandoah County, VA, Warren 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, Randolph County, WV, Tucker County, WV

The radar

The Sterling radar (KLWX), 86 km from the middle of the area, began a volume at 17:21 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 12, 2:42 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	63 min
Jun 12, 2:47 PM EDT	Severe Thunderstorm Warning	LWX	Clarke	58 min
Jun 12, 3:16 PM EDT	Severe Thunderstorm Warning	LWX	Hardy	44 min
Jun 12, 3:32 PM EDT	Severe Thunderstorm Warning	LWX	Jefferson	43 min
Jun 12, 3:50 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	25 min
Jun 12, 4:04 PM EDT	Severe Thunderstorm Warning	LWX	Prince William, City of Manassas, City of Manassas Park	56 min
Jun 12, 5:19 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	41 min
Jun 12, 5:23 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	67 min
Jun 12, 5:27 PM EDT	Severe Thunderstorm Warning	LWX	Prince George's	63 min
Jun 12, 5:45 PM EDT	Flash Flood Warning	LWX	Hampshire	2 hr
Jun 12, 5:51 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	39 min
Jun 12, 5:55 PM EDT	Flash Flood Warning	LWX	Baltimore, Carroll, City of Baltimore	2 hr
Jun 12, 6:02 PM EDT	Flash Flood Warning	LWX	Clarke	118 min
Jun 12, 6:06 PM EDT	Flash Flood Warning	LWX	Frederick, Shenandoah	114 min
Jun 12, 6:08 PM EDT	Tornado Warning	PBZ	Westmoreland	52 min
Jun 12, 6:18 PM EDT	Flash Flood Warning	LWX	Warren	117 min
Jun 12, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	53 min
Jun 12, 6:33 PM EDT	Severe Thunderstorm Warning	PHI	Kent	57 min
Jun 12, 6:33 PM EDT	Flash Flood Warning	LWX	Fauquier, Loudoun	117 min
Jun 12, 6:45 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Loudoun	60 min
Jun 12, 7:01 PM EDT	Severe Thunderstorm Warning	LWX	Prince William, City of Manassas, City of Manassas Park	59 min
Jun 12, 7:11 PM EDT	Severe Thunderstorm Warning	PBZ	Preston	64 min
Jun 12, 7:29 PM EDT	Flash Flood Warning	LWX	Montgomery	2 hr
Jun 12, 7:35 PM EDT	Flash Flood Warning	LWX	Prince William	115 min
Jun 12, 7:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	64 min
Jun 12, 7:55 PM EDT	Flash Flood Warning	LWX	Baltimore, Harford, City of Baltimore	2 hr

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, 5.3 hours before the alert went out and 126 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: 4 J/kg
Mixed-layer CIN: -244 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 4:06 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle	114 min
Jun 12, 12:02 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 4 more	58 min
Jun 12, 6:02 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Blair, Butler, Cambria, Centre and 5 more	58 min
Jun 12, 12:50 PM EDT	Severe Thunderstorm Watch	SPC	Albemarle, Alleghany, Amelia, Amherst, Appomattox, Augusta and 57 more	6 hr
Jun 12, 3:39 PM EDT	Mesoscale Discussion	SPC	Albemarle, Alleghany, Amelia, Amherst, Appomattox, Augusta and 44 more	2 hr

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2003 Severe Thunderstorm Watches in Maryland, 2003 Severe Thunderstorm Watches in Virginia, 2003 Every severe thunderstorm watch 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.