Alert archive / New Jersey / Mesoscale Discussions in 2012
Mesoscale Discussion 1959
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2012, 11:14 AM EDT for 5 states. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2012, 11:14 AM EDT (15:14 UTC)
- Expired
- Sep 18, 2012, 12:45 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 45 counties
New Castle County, DE, Cecil 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, Bronx 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, Westchester County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA
The radar
The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 15:14 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 3.2 hours before the alert went out and 164 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
- 114 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 721 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 224 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 3:26 PM EDT | Mesoscale Discussion | SPC | 34 min | |
| Sep 18, 3:38 PM EDT | Tornado Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region | 8 hr |
| Sep 18, 4:21 PM EDT | Mesoscale Discussion | SPC | 114 min | |
| Sep 18, 4:41 PM EDT | Mesoscale Discussion | SPC | 2 hr | |
| Sep 18, 7:42 PM EDT | Mesoscale Discussion | SPC | 63 min | |
| Sep 18, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | Capitol Planning Region, Northeastern Connecticut Planning Region | 6 hr |
| Sep 18, 11:19 AM EDT | Mesoscale Discussion | SPC | Kent, New Castle | 86 min |
| Sep 18, 12:10 PM EDT | Tornado Watch | SPC | Kent, New Castle, Sussex | 9 hr |
| Sep 18, 1:56 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 64 min |
| Sep 18, 6:08 PM EDT | Mesoscale Discussion | SPC | Kent, Sussex | 67 min |
| Sep 18, 6:15 PM EDT | Mesoscale Discussion | SPC | Kent, Sussex | 30 min |
| Sep 18, 8:49 AM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 8 more | 116 min |
| Sep 18, 10:54 AM EDT | Tornado Watch | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Dorchester and 11 more | 9 hr |
| Sep 18, 1:27 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Dorchester and 10 more | 63 min |
| Sep 18, 3:52 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Charles, Dorchester, Howard and 7 more | 113 min |
| Sep 18, 12:57 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Columbia, Cortland and 11 more | 93 min |
| Sep 18, 1:21 PM EDT | Tornado Watch | SPC | Broome, Chenango, Cortland, Delaware, Madison, Oneida and 4 more | 5 hr |
| Sep 18, 2:10 PM EDT | Mesoscale Discussion | SPC | Clinton, Essex, Franklin, Fulton, Hamilton, Herkimer and 6 more | 95 min |
Nearby
Mesoscale Discussions in New Jersey, 2012Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in New York, 2012Every mesoscale discussion 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.