Alert archive / Massachusetts / Mesoscale Discussions in 2008

Mesoscale Discussion 2237

September 9, 20086 counties in Massachusetts; Bristol County, Kent County, Providence County, Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Sep 9, 2008, 11:39 AM EDT for 6 counties in Massachusetts; Bristol County, Kent County, Providence County, Rhode Island. It was in force for 36 min.

The area

The outline as issued.

The facts

Issued: Sep 9, 2008, 11:39 AM EDT (15:39 UTC)
Expired: Sep 9, 2008, 12:15 PM EDT
In force: 36 min
Issued by: the Storm Prediction Center

Counties Bristol County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Providence County, RI

The radar

The Boston radar (KBOX), 56 km from the middle of the area, began a volume at 15:39 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 894Sep 9, 11:40 AM EDT

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 3.7 hours before the alert went out and 158 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 9, 8:35 AM EDT	Mesoscale Discussion	SPC		115 min
Sep 9, 9:33 AM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	6 hr
Sep 9, 11:40 AM EDT	Severe Thunderstorm Watch	SPC	Northeastern Connecticut Planning Region	3 hr
Sep 9, 12:11 PM EDT	Mesoscale Discussion	SPC		94 min

Nearby

Mesoscale Discussions in Massachusetts, 2008 Mesoscale Discussions in Connecticut, 2008 Mesoscale Discussions in Rhode Island, 2008 Every mesoscale discussion in 2008

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.