Alert archive / Connecticut / Mesoscale Discussions in 2024
Mesoscale Discussion 708
The Storm Prediction Center issued this mesoscale discussion at May 8, 2024, 4:44 PM EDT for 7 counties in Massachusetts; Dutchess County, Putnam County, Westchester County, New York; 5 counties in Rhode Island. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- May 8, 2024, 4:44 PM EDT (20:44 UTC)
- Expired
- May 8, 2024, 6:15 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Bristol County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Dutchess County, NY, Putnam 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), 93 km from the middle of the area, began a volume at 20:47 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
Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 93 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.
- Mixed-layer CAPE
- 78 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 791 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
437
ACUS11 KWNS 082044
SWOMCD
SPC MCD 082044
MAZ000-RIZ000-CTZ000-NYZ000-082215-
Mesoscale Discussion 0708
NWS Storm Prediction Center Norman OK
0344 PM CDT Wed May 08 2024
Areas affected...southern New England
Concerning...Severe potential...Watch unlikely
Valid 082044Z - 082215Z
Probability of Watch Issuance...20 percent
SUMMARY...The threat for large hail and damaging wind gusts
continues across southern New England.
DISCUSSION...A large supercell has developed in southern
Massachusetts where temperatures have warmed into the mid 70s with
dewpoints in the mid 60s. This has yielded 500 to 750 J/kg MLCAPE.
Despite this relatively weak instability, storm organization due to
70 knots of 0-6km shear (per BOX VWP), has been sufficient for
supercell maintenance. This intense storm will continue to pose a
severe wind and large hail threat as it moves east and the
downstream environment continues to destabilize ahead of it. In
addition, some storms are starting to develop to the west of this
supercell on the trailing outflow. Given a similarly warm and
unstable environment, one or two more strong to severe storms may
form and move along this outflow boundary this afternoon/evening.
..Bentley/Smith.. 05/08/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BOX...OKX...ALY...
LAT...LON 41887391 42287322 42597149 42417095 41847080 41447076
41387114 41127173 41087259 41007341 41097377 41297399
41887391SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 2:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
Nearby
Mesoscale Discussions in Connecticut, 2024Mesoscale Discussions in Massachusetts, 2024Mesoscale Discussions in Rhode Island, 2024Every 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.