Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 670
The Storm Prediction Center issued this severe thunderstorm watch at Aug 10, 2001, 12:45 PM EDT for 6 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2001, 12:45 PM EDT (16:45 UTC)
- Expired
- Aug 10, 2001, 8:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 70 counties
Berkshire County, MA, Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Cheshire County, NH, Hillsborough County, NH, Rockingham County, NH, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Sullivan County, NY, Ulster County, NY, Westchester County, NY, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Perry County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, York County, PA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI
The radar
The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 16:48 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
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 1:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 32 min |
| Aug 10, 1:21 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 24 min |
| Aug 10, 1:38 PM EDT | Severe Thunderstorm Warning | OKX | Westchester | 52 min |
| Aug 10, 1:39 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 66 min |
| Aug 10, 1:40 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 50 min |
| Aug 10, 1:45 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 30 min |
| Aug 10, 1:54 PM EDT | Severe Thunderstorm Warning | GYX | Rockingham | 51 min |
| Aug 10, 2:05 PM EDT | Severe Thunderstorm Warning | BOX | Norfolk, Plymouth | 25 min |
| Aug 10, 2:11 PM EDT | Flash Flood Warning | CTP | Lancaster, Lebanon | 3 hr |
| Aug 10, 2:14 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon | 61 min |
| Aug 10, 2:22 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 38 min |
| Aug 10, 2:31 PM EDT | Severe Thunderstorm Warning | BOX | Kent, Washington | 29 min |
| Aug 10, 2:44 PM EDT | Severe Thunderstorm Warning | OKX | Nassau | 46 min |
| Aug 10, 3:08 PM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 67 min |
| Aug 10, 3:31 PM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 59 min |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 4.8 hours before the alert went out and 127 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
- 1502 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 1254 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 1.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2001Severe Thunderstorm Watches in New Jersey, 2001Severe Thunderstorm Watches in New York, 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.