Alert archive / New Jersey / Mesoscale Discussions in 2022

Mesoscale Discussion 937

May 27, 20225 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2022, 11:55 AM EDT for 5 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 27, 2022, 11:55 AM EDT (15:55 UTC)
Expired: May 27, 2022, 1:30 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 33 counties

Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Richmond County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Dauphin County, PA, Delaware County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Schuylkill County, PA, York County, PA

The radar

The Dover AFB radar (KDOX), 125 km from the middle of the area, began a volume at 15:58 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 278May 27, 12:55 PM EDT

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.9 hours before the alert went out and 166 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: 221 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 481 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

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
May 27, 12:57 PM EDT	Severe Thunderstorm Watch	SPC	Kent, New Castle, Sussex	5 hr
May 27, 6:24 AM EDT	Tornado Watch	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 6 more	8 hr
May 27, 8:13 AM EDT	Mesoscale Discussion	SPC	Charles, Prince George's	2 hr
May 27, 10:59 AM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 5 more	91 min
May 27, 11:50 AM EDT	Tornado Watch	SPC	Cecil, Dorchester, Harford, Somerset, Wicomico, Worcester	4 hr
May 27, 5:45 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	4 hr
May 27, 7:22 PM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Prince George's, Saint Mary's	83 min
May 27, 3:16 PM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	89 min

Nearby

Mesoscale Discussions in New Jersey, 2022 Mesoscale Discussions in Pennsylvania, 2022 Mesoscale Discussions in Delaware, 2022 Every mesoscale discussion in 2022

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.