Alert archive / New Jersey / Mesoscale Discussions in 2020

Mesoscale Discussion 1024

June 27, 20206 counties in New Jersey

The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2020, 4:15 PM EDT for 6 counties in New Jersey. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 27, 2020, 4:15 PM EDT (20:15 UTC)
Expired: Jun 27, 2020, 5:45 PM EDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 310

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 32 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 156 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1675 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 131 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
Jun 27, 12:34 PM EDT	Mesoscale Discussion	SPC	Bergen, Burlington, Essex, Hudson, Hunterdon, Mercer and 9 more	2 hr
Jun 27, 3:16 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Burlington, Camden, Gloucester, Hunterdon, Mercer and 4 more	5 hr
Jun 27, 5:30 PM EDT	Mesoscale Discussion	SPC	Cumberland, Salem	60 min

Nearby

Mesoscale Discussions in New Jersey, 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.