Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 49, NWS Boston/Norton, MA

August 21, 2004Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 21, 2004, 3:05 AM EDT for Worcester County, Massachusetts. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 21, 2004, 3:05 AM EDT (07:05 UTC)
Expired: Aug 21, 2004, 3:45 AM EDT
In force: 40 min
Issued by: NWS Boston/Norton, MA
Area: Counties, with a storm outline in the text

County Worcester County, MA

The radar

The Boston radar (KBOX), 105 km from the middle of the area, began a volume at 07:06 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

Albany, NY (KALY), launched 00:00Z, 7.1 hours before the alert went out and 138 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: 78 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 1074 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 78 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.

000 
WUUS51 KBOX 210705
SVRBOX
MAC027-210745-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
304 AM EDT SAT AUG 21 2004

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS
  THIS INCLUDES THE CITY OF FITCHBURG

* UNTIL 345 AM EDT

* AT 302 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM ORANGE TO WEST BROOKFIELD...AND MOVING NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PHILLIPSTON AND BARRE BY 310 AM EDT
  TEMPLETON AND HUBBARDSTON BY 315 AM EDT
  GARDNER BY 320 AM EDT
  WESTMINSTER AND ASHBURNHAM BY 325 AM EDT
  FITCHBURG BY 330 AM EDT

LAT...LON 4252 7238 4226 7232 4258 7180 4270 7193

$$

WTB

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 8:31 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	29 min
Aug 21, 4:36 AM EDT	Special Marine Warning	BOX		54 min
Aug 21, 3:22 PM EDT	Special Marine Warning	BOX		83 min
Aug 21, 3:22 PM EDT	Special Marine Warning	BOX		83 min
Aug 21, 4:08 PM EDT	Special Marine Warning	BOX		67 min
Aug 21, 4:08 PM EDT	Special Marine Warning	BOX		67 min
Aug 21, 4:12 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth, Suffolk	33 min
Aug 21, 4:37 PM EDT	Special Marine Warning	BOX		53 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2004 Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.