Alert archive / Massachusetts / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 533

July 2, 20046 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 2, 2004, 12:40 PM EDT for 6 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 2, 2004, 12:40 PM EDT (16:40 UTC)
Expired
Jul 2, 2004, 7:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 30 counties

Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Cumberland County, ME, York County, ME, Hillsborough County, NH, Rockingham County, NH, Strafford County, NH, Bergen County, NJ, Passaic County, NJ, Bronx County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.7 hours before the alert went out and 126 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2004-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1481 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2004-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1481 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
161 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 2, 11:54 AM EDTMesoscale DiscussionSPC2 hr
Jul 2, 2:09 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 3:55 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 5:46 PM EDTMesoscale DiscussionSPC59 min

Nearby

Severe Thunderstorm Watches in Massachusetts, 2004Severe Thunderstorm Watches in Connecticut, 2004Severe Thunderstorm Watches in New York, 2004Every severe thunderstorm watch in 2004

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.