Alert archive / New Jersey / Mesoscale Discussions in 2009

Mesoscale Discussion 1682

July 26, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2009, 6:37 PM EDT for 5 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2009, 6:37 PM EDT (22:37 UTC)
Expired: Jul 26, 2009, 8:30 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center

All 47 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Columbia 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, Ulster County, NY, Westchester County, NY, Bucks County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Brookhaven radar (KOKX), 60 km from the middle of the area, began a volume at 22:39 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.6 hours before the alert went out and 59 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 933 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 26, 1:13 PM EDT	Mesoscale Discussion	SPC		2 hr
Jul 26, 3:14 PM EDT	Mesoscale Discussion	SPC		2 hr
Jul 26, 3:51 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more	7 hr
Jul 26, 1:40 PM EDT	Mesoscale Discussion	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	2 hr
Jul 26, 2:07 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Cape May, Cumberland, Gloucester, Salem	7 hr
Jul 26, 4:16 PM EDT	Mesoscale Discussion	SPC	Atlantic, Cape May, Cumberland, Salem	89 min
Jul 26, 12:56 PM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 6 more	2 hr

Nearby

Mesoscale Discussions in New Jersey, 2009 Mesoscale Discussions in New York, 2009 Mesoscale Discussions in Connecticut, 2009 Every mesoscale discussion in 2009

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.