Alert archive / Maryland / Mesoscale Discussions in 2026

Mesoscale Discussion 2191

September 1, 2026Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland; 4 counties in New Jersey

The Storm Prediction Center issued this mesoscale discussion at Sep 1, 2026, 9:46 PM EDT for Kent County, New Castle County, Sussex County, Delaware; 4 counties in Maryland; 4 counties in New Jersey. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Sep 1, 2026, 9:46 PM EDT (01:46 UTC)
Expired: Sep 1, 2026, 11:45 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 638

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 41 km from the middle of the area, began a volume at 01:47 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.8 hours before the alert went out and 193 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: 1278 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1771 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.1

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
Sep 2, 11:09 AM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 7 more	66 min
Sep 2, 11:46 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 13 more	5 hr
Sep 2, 1:21 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Charles, Harford, Howard and 6 more	84 min

Nearby

Mesoscale Discussions in Maryland, 2026 Mesoscale Discussions in New Jersey, 2026 Mesoscale Discussions in Delaware, 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.