Alert archive / New Jersey / Mesoscale Discussions in 2020

Mesoscale Discussion 384

April 13, 2020Kent County, New Castle County, Delaware; 4 counties in Maryland; 5 counties in New Jersey

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2020, 3:03 PM EDT for Kent County, New Castle County, Delaware; 4 counties in Maryland; 5 counties in New Jersey. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2020, 3:03 PM EDT (19:03 UTC)
Expired: Apr 13, 2020, 4:30 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 19:06 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.1 hours before the alert went out and 158 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 83 kt
0-1 km storm-relative helicity: 570 m²/s²
0-3 km storm-relative helicity: 696 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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
Apr 13, 10:34 AM EDT	Mesoscale Discussion	SPC	New Castle	86 min
Apr 13, 11:33 AM EDT	Tornado Watch	SPC	Kent, New Castle, Sussex	5 hr
Apr 13, 1:20 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	85 min
Apr 13, 6:46 AM EDT	Mesoscale Discussion	SPC	Somerset	89 min
Apr 13, 2:42 PM EDT	Mesoscale Discussion	SPC	Bergen, Passaic, Sussex	93 min

Nearby

Mesoscale Discussions in New Jersey, 2020 Mesoscale Discussions in Maryland, 2020 Mesoscale Discussions in Delaware, 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.