Alert archive / New Jersey / Mesoscale Discussions in 2013

Mesoscale Discussion 994

June 7, 2013Sussex County, Delaware; 6 counties in New Jersey; Nassau County, New York

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2013, 7:27 PM EDT for Sussex County, Delaware; 6 counties in New Jersey; Nassau County, New York. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jun 7, 2013, 7:27 PM EDT (23:27 UTC)
Expired
Jun 7, 2013, 10:00 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Sussex County, DE, Atlantic County, NJ, Burlington County, NJ, Cape May County, NJ, Cumberland County, NJ, Monmouth County, NJ, Ocean County, NJ, Nassau County, NY

The radar

The Philadelphia radar (KDIX), 17 km from the middle of the area, began a volume at 23:28 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.5 hours before the alert went out and 161 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2013-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2013-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
17 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
483 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Jun 7, 1:00 PM EDTTornado WatchSPCSussex7 hr
Jun 7, 3:32 PM EDTMesoscale DiscussionSPCSussex58 min

Nearby

Mesoscale Discussions in New Jersey, 2013Mesoscale Discussions in Delaware, 2013Mesoscale Discussions in New York, 2013Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.