Alert archive / Connecticut / Mesoscale Discussions in 2007

Mesoscale Discussion 1539

July 19, 2007Hampden County, Massachusetts; 5 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2007, 2:13 PM EDT for Hampden County, Massachusetts; 5 counties in New York. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2007, 2:13 PM EDT (18:13 UTC)
Expired: Jul 19, 2007, 3:15 PM EDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Hampden County, MA, Dutchess County, NY, Nassau County, NY, Putnam County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 74 km from the middle of the area, began a volume at 18:13 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 545Jul 19, 3:10 PM EDT

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 6.2 hours before the alert went out and 144 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: 597 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 80 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
Jul 19, 3:09 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region	4 hr
Jul 19, 7:02 PM EDT	Mesoscale Discussion	SPC		88 min
Jul 19, 2:07 PM EDT	Severe Thunderstorm Watch	SPC	Bronx, Kings, New York, Queens, Richmond	8 hr
Jul 19, 4:32 PM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	88 min
Jul 19, 6:27 PM EDT	Mesoscale Discussion	SPC	Kings, New York, Richmond	93 min
Jul 19, 7:15 PM EDT	Mesoscale Discussion	SPC	Chautauqua	90 min

Nearby

Mesoscale Discussions in Connecticut, 2007 Mesoscale Discussions in New York, 2007 Mesoscale Discussions in Massachusetts, 2007 Every mesoscale discussion in 2007

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.