Alert archive / New Jersey / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 318
The Storm Prediction Center issued this severe thunderstorm watch at May 29, 2012, 5:54 PM EDT for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 29, 2012, 5:54 PM EDT (21:54 UTC)
- Expired
- May 29, 2012, 9:15 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 34 counties
Greater Bridgeport Planning Region, CT, Naugatuck Valley Planning Region, CT, Bergen County, NJ, Burlington County, NJ, Camden 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, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 21:55 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 91 min |
| May 29, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 53 min |
| May 29, 6:32 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 66 min |
| May 29, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 53 min |
| May 29, 8:35 PM EDT | Severe Thunderstorm Warning | OKX | Greater Bridgeport Planning Region | 40 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
Brookhaven, NY (KOKX), launched 12:00Z, 9.9 hours before the alert went out and 155 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
- 1578 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 960 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- -16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 12:26 PM EDT | Tornado Watch | SPC | Northwest Hills Planning Region | 8 hr |
| May 29, 2:13 PM EDT | Mesoscale Discussion | SPC | 62 min | |
| May 29, 3:44 PM EDT | Severe Thunderstorm Watch | SPC | Capitol Planning Region | 5 hr |
| May 29, 7:01 PM EDT | Mesoscale Discussion | SPC | 89 min | |
| May 29, 7:21 PM EDT | Mesoscale Discussion | SPC | 54 min | |
| May 29, 4:40 PM EDT | Mesoscale Discussion | SPC | Hunterdon, Morris, Sussex, Warren | 65 min |
| May 29, 10:27 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Cayuga, Chautauqua, Jefferson, Lewis and 11 more | 5 hr |
| May 29, 11:43 AM EDT | Mesoscale Discussion | SPC | Albany, Broome, Cayuga, Chemung, Chenango, Columbia and 26 more | 62 min |
| May 29, 12:01 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Columbia, Cortland and 19 more | 59 min |
| May 29, 1:03 PM EDT | Severe Thunderstorm Watch | SPC | Broome, Chemung, Chenango, Cortland, Delaware, Madison and 5 more | 8 hr |
| May 29, 1:25 PM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 13 more | 65 min |
| May 29, 1:52 PM EDT | Mesoscale Discussion | SPC | Albany, Clinton, Columbia, Essex, Franklin, Fulton and 8 more | 53 min |
| May 29, 3:12 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Cortland, Delaware and 12 more | 63 min |
| May 29, 3:26 PM EDT | Mesoscale Discussion | SPC | Albany, Clinton, Columbia, Essex, Franklin, Fulton and 11 more | 64 min |
| May 29, 9:48 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Clearfield and 8 more | 87 min |
Nearby
Severe Thunderstorm Watches in New Jersey, 2012Severe Thunderstorm Watches in New York, 2012Severe Thunderstorm Watches in Pennsylvania, 2012Every severe thunderstorm watch in 2012
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.