Alert archive / New Jersey / Mesoscale Discussions in 2020

Mesoscale Discussion 1376

August 2, 20208 counties in New Jersey; Lehigh County, Northampton County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2020, 6:53 AM EDT for 8 counties in New Jersey; Lehigh County, Northampton County, Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 2, 2020, 6:53 AM EDT (10:53 UTC)
Expired: Aug 2, 2020, 9:30 AM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Essex County, NJ, Hunterdon County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 10:56 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 00:00Z, 10.9 hours before the alert went out and 180 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: 18 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 2, 2:00 PM EDT	Mesoscale Discussion	SPC	Sussex	2 hr
Aug 2, 3:10 PM EDT	Tornado Watch	SPC	Bergen, Passaic, Sussex	7 hr
Aug 2, 6:45 PM EDT	Mesoscale Discussion	SPC	Bergen, Morris, Passaic, Sussex, Warren	2 hr

Nearby

Mesoscale Discussions in New Jersey, 2020 Mesoscale Discussions in Pennsylvania, 2020 Every mesoscale discussion in 2020

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.