Alert archive / New Jersey / Mesoscale Discussions in 2018

Mesoscale Discussion 1586

October 16, 2018Kent County, Sussex County, Delaware; 4 counties in New Jersey

The Storm Prediction Center issued this mesoscale discussion at Oct 16, 2018, 12:18 AM EDT for Kent County, Sussex County, Delaware; 4 counties in New Jersey. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Oct 16, 2018, 12:18 AM EDT (04:18 UTC)
Expired
Oct 16, 2018, 2:15 AM EDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Kent County, DE, Sussex County, DE, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Ocean County, NJ

The radar

The Dover AFB radar (KDOX), 48 km from the middle of the area, began a volume at 04:19 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 00:00Z, 4.3 hours before the alert went out and 139 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, Wallops Is Stn, VA at 00:00Z on 2018-10-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 99 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, Wallops Is Stn, VA at 00:00Z on 2018-10-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 square meters per square second.1939587897Sfc1 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
99 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1194 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in New Jersey, 2018Mesoscale Discussions in Delaware, 2018Every mesoscale discussion in 2018

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.