Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 407
The Storm Prediction Center issued this severe thunderstorm watch at Jul 9, 2014, 4:12 PM EDT for 8 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2014, 4:12 PM EDT (20:12 UTC)
- Expired
- Jul 9, 2014, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 107 counties
Capitol Planning Region, CT, Greater Bridgeport Planning Region, CT, Naugatuck Valley Planning Region, CT, Northwest Hills Planning Region, CT, Kent County, DE, New Castle County, DE, Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Cecil County, MD, Charles 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, Saint Mary's County, MD, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden 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, Albany County, NY, Bronx County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Otsego County, NY, Putnam County, NY, Queens County, NY, Rensselaer County, NY, Richmond County, NY, Rockland County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Westchester County, NY, 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, Sullivan 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 Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Prince William County, VA, Rappahannock County, VA, Spotsylvania County, VA, Stafford County, VA
The radar
The Philadelphia radar (KDIX), 151 km from the middle of the area, began a volume at 20:14 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| Jul 9, 4:19 PM EDT | Severe Thunderstorm Warning | BGM | Chenango, Otsego | 56 min |
| Jul 9, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 49 min |
| Jul 9, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 37 min |
| Jul 9, 4:40 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, King George, Prince William, Stafford | 50 min |
| Jul 9, 4:49 PM EDT | Severe Thunderstorm Warning | OKX | Orange, Putnam, Rockland, Westchester | 23 min |
| Jul 9, 5:04 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Orange, Prince William, Spotsylvania, Stafford and 1 more | 41 min |
| Jul 9, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe, Northampton | 53 min |
| Jul 9, 5:09 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Delaware, Sullivan | 66 min |
| Jul 9, 5:18 PM EDT | Severe Thunderstorm Warning | ALY | Schoharie | 27 min |
| Jul 9, 5:21 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 39 min |
| Jul 9, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 64 min |
| Jul 9, 5:42 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Monroe, Northampton | 48 min |
| Jul 9, 5:44 PM EDT | Severe Thunderstorm Warning | OKX | Greater Bridgeport Planning Region | 61 min |
| Jul 9, 5:45 PM EDT | Severe Thunderstorm Warning | LWX | King George, Spotsylvania, Stafford, City of Fredericksburg | 30 min |
| Jul 9, 5:50 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Schoharie | 25 min |
| Jul 9, 5:52 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 53 min |
| Jul 9, 6:13 PM EDT | Severe Thunderstorm Warning | ALY | Albany | 32 min |
| Jul 9, 6:24 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer | 51 min |
| Jul 9, 6:27 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 63 min |
| Jul 9, 6:34 PM EDT | Severe Thunderstorm Warning | BGM | Sullivan | 56 min |
| Jul 9, 6:36 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's, Saint Mary's | 54 min |
| Jul 9, 6:57 PM EDT | Severe Thunderstorm Warning | OKX | Orange | 63 min |
| Jul 9, 7:00 PM EDT | Severe Thunderstorm Warning | OKX | Greater Bridgeport Planning Region, Naugatuck Valley Planning Region | 60 min |
| Jul 9, 7:00 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer, Washington | 60 min |
| Jul 9, 7:08 PM EDT | Severe Thunderstorm Warning | OKX | Greater Bridgeport Planning Region | 67 min |
| Jul 9, 7:10 PM EDT | Severe Thunderstorm Warning | ALY | Columbia, Dutchess, Ulster | 65 min |
| Jul 9, 8:18 PM EDT | Severe Thunderstorm Warning | ALY | Northwest Hills Planning Region | 57 min |
| Jul 9, 8:49 PM EDT | Severe Thunderstorm Warning | OKX | Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region | 32 min |
| Jul 9, 9:15 PM EDT | Severe Thunderstorm Warning | ALY | Northwest Hills Planning Region | 30 min |
| Jul 9, 9:15 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 45 min |
| Jul 9, 9:24 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 51 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, 8.2 hours before the alert went out and 69 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
- 159 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1115 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 9:55 PM EDT | Mesoscale Discussion | SPC | 95 min | |
| Jul 9, 7:59 PM EDT | Mesoscale Discussion | SPC | 91 min | |
| Jul 9, 3:23 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle | 97 min |
| Jul 9, 12:53 PM EDT | Mesoscale Discussion | SPC | Berkshire | 3 hr |
| Jul 9, 1:51 PM EDT | Mesoscale Discussion | SPC | Appomattox, Bedford, Bland, Botetourt, Campbell, Carroll and 25 more | 84 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2014Severe Thunderstorm Watches in New Jersey, 2014Severe Thunderstorm Watches in New York, 2014Every severe thunderstorm watch in 2014
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.