Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 538
The Storm Prediction Center issued this severe thunderstorm watch at Jul 10, 2001, 1:45 PM EDT for 6 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2001, 1:45 PM EDT (17:45 UTC)
- Expired
- Jul 10, 2001, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 83 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert 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, 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, Salem County, NJ, Somerset County, NJ, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Cambria County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata 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, Somerset County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Loudoun County, VA, Madison County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham 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
The radar
The Sterling radar (KLWX), 90 km from the middle of the area, began a volume at 17:48 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
37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 2:15 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 30 min |
| Jul 10, 2:35 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, York | 40 min |
| Jul 10, 2:46 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 44 min |
| Jul 10, 3:11 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 49 min |
| Jul 10, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 43 min |
| Jul 10, 3:31 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 44 min |
| Jul 10, 3:35 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 40 min |
| Jul 10, 3:37 PM EDT | Tornado Warning | CTP | Franklin | 23 min |
| Jul 10, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick | 65 min |
| Jul 10, 3:49 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 41 min |
| Jul 10, 3:55 PM EDT | Tornado Warning | LWX | Carroll, Frederick | 50 min |
| Jul 10, 4:08 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 52 min |
| Jul 10, 4:16 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 44 min |
| Jul 10, 4:32 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 58 min |
| Jul 10, 4:32 PM EDT | Severe Thunderstorm Warning | LWX | City of Baltimore | 58 min |
| Jul 10, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Howard | 65 min |
| Jul 10, 4:47 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 58 min |
| Jul 10, 4:53 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 52 min |
| Jul 10, 5:23 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 37 min |
| Jul 10, 5:27 PM EDT | Severe Thunderstorm Warning | LWX | Hampshire | 48 min |
| Jul 10, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 42 min |
| Jul 10, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 35 min |
| Jul 10, 5:55 PM EDT | Tornado Warning | LWX | Hampshire | 35 min |
| Jul 10, 6:15 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 45 min |
| Jul 10, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 45 min |
| Jul 10, 6:42 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 48 min |
| Jul 10, 6:43 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria | 47 min |
| Jul 10, 6:51 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 24 min |
| Jul 10, 7:06 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 54 min |
| Jul 10, 7:10 PM EDT | Severe Thunderstorm Warning | LWX | Warren | 50 min |
| Jul 10, 7:14 PM EDT | Tornado Warning | CTP | Dauphin | 46 min |
| Jul 10, 7:15 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Somerset | 45 min |
| Jul 10, 7:23 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 67 min |
| Jul 10, 7:36 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 54 min |
| Jul 10, 7:39 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex | 21 min |
| Jul 10, 7:44 PM EDT | Severe Thunderstorm Warning | LWX | Prince William, City of Manassas, City of Manassas Park | 61 min |
| Jul 10, 8:09 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 51 min |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.8 hours before the alert went out and 91 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.
- Mixed-layer CAPE
- 37 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1756 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Jul 10, 4:00 PM EDT | Severe Thunderstorm Watch | SPC | Garrett | 7 hr |
| Jul 10, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Morris, Passaic, Sussex, Warren | 5 hr |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2001Severe Thunderstorm Watches in Virginia, 2001Severe Thunderstorm Watches in Maryland, 2001Every severe thunderstorm watch in 2001
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.