Alert archive / New Jersey / Mesoscale Discussions in 2026

Mesoscale Discussion 2148

August 27, 202611 counties in New Jersey; Richmond County, New York; Delaware County, Philadelphia County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2026, 2:29 PM EDT for 11 counties in New Jersey; Richmond County, New York; Delaware County, Philadelphia County, Pennsylvania. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 27, 2026, 2:29 PM EDT (18:29 UTC)
Expired: Aug 27, 2026, 4:30 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 630

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Richmond County, NY, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 18:29 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, 6.5 hours before the alert went out and 212 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: 346 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 87 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 27, 10:57 AM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cumberland, Essex and 14 more	2 hr
Aug 27, 12:51 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	9 hr
Aug 27, 12:51 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chemung, Chenango, Columbia, Cortland and 22 more	114 min
Aug 27, 1:53 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Broome, Cayuga, Chemung, Chenango, Columbia and 28 more	7 hr
Aug 27, 4:22 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Delaware, Fulton, Greene, Montgomery and 7 more	113 min
Aug 27, 7:06 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Delaware, Dutchess, Greene, Rensselaer and 6 more	84 min
Aug 27, 1:52 PM EDT	Mesoscale Discussion	SPC	Adams, Cumberland, Dauphin, Franklin, Fulton, Juniata and 2 more	113 min
Aug 27, 3:17 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 16 more	7 hr
Aug 27, 7:26 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Columbia, Cumberland, Dauphin, Lancaster and 8 more	94 min

Nearby

Mesoscale Discussions in New Jersey, 2026 Mesoscale Discussions in Pennsylvania, 2026 Mesoscale Discussions in New York, 2026 Every mesoscale discussion in 2026

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.