Alert archive / New Jersey / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 96
The Storm Prediction Center issued this severe thunderstorm watch at Apr 9, 2020, 12:01 PM EDT for 7 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2020, 12:01 PM EDT (16:01 UTC)
- Expired
- Apr 9, 2020, 4:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 59 counties
Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Southeastern Connecticut Planning Region, CT, Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, 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, Atlantic County, NJ, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cape May 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, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, Fairfax County, VA
The radar
The Philadelphia radar (KDIX), 68 km from the middle of the area, began a volume at 16:03 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 12:13 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 47 min |
| Apr 9, 12:23 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 52 min |
| Apr 9, 12:24 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 66 min |
| Apr 9, 12:29 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 31 min |
| Apr 9, 12:57 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 33 min |
| Apr 9, 1:00 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren | 45 min |
| Apr 9, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Apr 9, 1:16 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Harford, City of Baltimore | 18 min |
| Apr 9, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset | 52 min |
| Apr 9, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 49 min |
| Apr 9, 1:33 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Mercer, Monmouth and 2 more | 42 min |
| Apr 9, 1:34 PM EDT | Severe Thunderstorm Warning | OKX | Essex, Hudson, Union | 41 min |
| Apr 9, 2:08 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Monmouth, Ocean | 30 min |
| Apr 9, 2:15 PM EDT | Severe Thunderstorm Warning | OKX | Kings, Nassau, Queens, Suffolk | 45 min |
| Apr 9, 3:07 PM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 38 min |
| Apr 9, 3:09 PM EDT | Severe Thunderstorm Warning | OKX | Southeastern Connecticut Planning Region | 36 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.0 hours before the alert went out and 198 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
- 1 J/kg
- Mixed-layer CIN
- -398 J/kg
- Mixed-layer LCL
- 1372 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 2:40 PM EDT | Mesoscale Discussion | SPC | 65 min | |
| Apr 9, 11:09 AM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 66 min |
| Apr 8, 10:14 PM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Wise, City of Norton | 3 hr |
| Apr 8, 10:51 PM EDT | Tornado Watch | SPC | Buchanan, Dickenson | 5 hr |
| Apr 8, 11:16 PM EDT | Severe Thunderstorm Watch | SPC | Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more | 6 hr |
| Apr 9, 12:50 AM EDT | Mesoscale Discussion | SPC | Alleghany, Bath, Bland, Craig, Giles, Highland and 7 more | 115 min |
| Apr 9, 2:03 AM EDT | Severe Thunderstorm Watch | SPC | Albemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 37 more | 3 hr |
| Apr 9, 3:36 AM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 40 more | 84 min |
Nearby
Severe Thunderstorm Watches in New Jersey, 2020Severe Thunderstorm Watches in Maryland, 2020Severe Thunderstorm Watches in New York, 2020Every severe thunderstorm watch in 2020
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.