Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 260

May 10, 20007 states

The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2000, 11:15 AM EDT for 7 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 10, 2000, 11:15 AM EDT (15:15 UTC)
Expired: May 10, 2000, 5:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 82 counties

New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, 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, Talbot County, MD, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Passaic County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Albany County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Montgomery County, NY, Orange County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Dauphin County, PA, Delaware County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming 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, Fairfax County, VA, Fauquier County, VA, Loudoun County, VA, Prince William County, VA, Addison County, VT, Bennington County, VT, Orange County, VT, Rutland County, VT, Windsor County, VT

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 10, 11:16 AM EDT	Severe Thunderstorm Warning	ALY	Columbia, Dutchess	59 min
May 10, 11:39 AM EDT	Severe Thunderstorm Warning	BGM	Delaware, Otsego	66 min
May 10, 11:42 AM EDT	Tornado Warning	CTP	Dauphin	33 min
May 10, 11:48 AM EDT	Severe Thunderstorm Warning	CTP	York	57 min
May 10, 11:49 AM EDT	Severe Thunderstorm Warning	BGM	Susquehanna, Wyoming	56 min
May 10, 11:52 AM EDT	Severe Thunderstorm Warning	BGM	Delaware, Sullivan	68 min
May 10, 12:05 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	55 min
May 10, 12:16 PM EDT	Severe Thunderstorm Warning	BGM	Luzerne	59 min
May 10, 12:19 PM EDT	Severe Thunderstorm Warning	CTP	Columbia	56 min
May 10, 12:38 PM EDT	Severe Thunderstorm Warning	ALY	Herkimer	52 min
May 10, 12:58 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Perry	62 min
May 10, 1:05 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	70 min
May 10, 1:45 PM EDT	Severe Thunderstorm Warning	ALY	Montgomery, Schoharie	45 min
May 10, 1:48 PM EDT	Flash Flood Warning	ALY	Herkimer	2 hr
May 10, 1:58 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Northumberland	62 min
May 10, 2:17 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Schuylkill	58 min
May 10, 2:30 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Saratoga	60 min
May 10, 2:40 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	50 min
May 10, 2:45 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	60 min
May 10, 3:07 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Northumberland	68 min
May 10, 3:19 PM EDT	Severe Thunderstorm Warning	BGM	Bradford, Susquehanna	41 min
May 10, 3:19 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, York	86 min
May 10, 3:20 PM EDT	Severe Thunderstorm Warning	LWX	Carroll	40 min
May 10, 3:48 PM EDT	Flash Flood Warning	BGM	Susquehanna	3 hr
May 10, 3:54 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll	51 min
May 10, 3:55 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	25 min
May 10, 3:56 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	64 min
May 10, 4:00 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	45 min
May 10, 4:11 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Montgomery	49 min
May 10, 4:15 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Prince William	45 min
May 10, 4:27 PM EDT	Tornado Warning	CTP	Lancaster	48 min
May 10, 4:30 PM EDT	Flash Flood Warning	ALY	Hamilton, Herkimer	5 hr
May 10, 4:31 PM EDT	Severe Thunderstorm Warning	LWX	Howard	44 min
May 10, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Howard, Montgomery	47 min
May 10, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	City of Baltimore	47 min
May 10, 4:47 PM EDT	Severe Thunderstorm Warning	ALY	Saratoga	28 min
May 10, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Chester	25 min
May 10, 4:58 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Prince William, City of Fairfax, City of Falls Church	47 min
May 10, 4:58 PM EDT	Severe Thunderstorm Warning	LWX	City of Manassas, City of Manassas Park	47 min

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 3.3 hours before the alert went out and 157 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: 786 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1290 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 10, 3:45 PM EDT	Severe Thunderstorm Watch	SPC	New Castle	5 hr
May 10, 12:00 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Cattaraugus, Chautauqua, Chemung, Erie, Genesee and 9 more	4 hr
May 10, 10:45 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cayuga, Chemung, Chenango, Cortland and 17 more	6 hr

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2000 Severe Thunderstorm Watches in New York, 2000 Severe Thunderstorm Watches in Maryland, 2000 Every severe thunderstorm watch in 2000

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.