Alert archive / New Jersey / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 573

November 18, 201316 counties in New Jersey; 10 counties in Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at Nov 18, 2013, 1:07 AM EST for 16 counties in New Jersey; 10 counties in Pennsylvania. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Nov 18, 2013, 1:07 AM EST (06:07 UTC)
Expired: Nov 18, 2013, 5:49 AM EST
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

All 26 counties

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, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 136 km from the middle of the area, began a volume at 06:09 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: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 10%
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: 40%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Nov 18, 1:58 AM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	62 min
Nov 18, 2:28 AM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery	62 min
Nov 18, 2:46 AM EST	Severe Thunderstorm Warning	PHI	Salem	59 min
Nov 18, 2:54 AM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	66 min
Nov 18, 3:29 AM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon and 6 more	61 min
Nov 18, 3:39 AM EST	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	66 min
Nov 18, 4:06 AM EST	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	24 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 18, 2:31 AM EST	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	89 min
Nov 18, 3:11 AM EST	Severe Thunderstorm Watch	SPC	Bergen, Essex, Hudson, Passaic, Union	4 hr
Nov 18, 5:07 AM EST	Mesoscale Discussion	SPC	Ocean	113 min
Nov 17, 7:36 PM EST	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more	54 min
Nov 17, 8:23 PM EST	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more	4 hr
Nov 17, 10:24 PM EST	Mesoscale Discussion	SPC	Armstrong, Bedford, Blair, Bradford, Cambria, Cameron and 27 more	66 min
Nov 17, 11:06 PM EST	Severe Thunderstorm Watch	SPC	Adams, Bedford, Blair, Centre, Clinton, Columbia and 19 more	4 hr

Nearby

Severe Thunderstorm Watches in New Jersey, 2013 Severe Thunderstorm Watches in Pennsylvania, 2013 Every severe thunderstorm watch in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.