Alert archive / Connecticut / Mesoscale Discussions in 2024

Mesoscale Discussion 1439

June 26, 20247 counties in Massachusetts; 5 counties in New York; 5 counties in Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2024, 8:53 PM EDT for 7 counties in Massachusetts; 5 counties in New York; 5 counties in Rhode Island. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2024, 8:53 PM EDT (00:53 UTC)
Expired: Jun 26, 2024, 10:30 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 469

Counties Bristol County, MA, Hampden County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Dutchess County, NY, Nassau County, NY, Putnam County, NY, Suffolk County, NY, Westchester County, NY, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Brookhaven radar (KOKX), 64 km from the middle of the area, began a volume at 00:55 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 472Jun 26, 9:55 PM EDT

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.9 hours before the alert went out and 64 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: 760 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 1059 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

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
Jun 26, 9:58 PM EDT	Severe Thunderstorm Watch	SPC	Bristol, Hampden, Middlesex, Norfolk, Plymouth, Suffolk and 1 more	3 hr
Jun 26, 11:12 PM EDT	Mesoscale Discussion	SPC	Barnstable, Bristol, Essex, Middlesex, Norfolk, Plymouth and 2 more	63 min

Nearby

Mesoscale Discussions in Connecticut, 2024 Mesoscale Discussions in Massachusetts, 2024 Mesoscale Discussions in New York, 2024 Every mesoscale discussion in 2024

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.