Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 48, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 20, 2004, 8:31 PM EDT for Middlesex County, Massachusetts. It was in force for 29 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 20, 2004, 8:31 PM EDT (00:31 UTC)
- Expired
- Aug 20, 2004, 9:00 PM EDT
- In force
- 29 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Counties, with a storm outline in the text
County Middlesex County, MA
The radar
The Boston radar (KBOX), 102 km from the middle of the area, began a volume at 00:33 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 20, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Albany, NY (KALY), launched 00:00Z, 0.5 hours before the alert went out and 151 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
- -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
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KBOX 210031 SVRBOX MAC017-210100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 831 PM EDT FRI AUG 20 2004 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS THIS INCLUDES THE CITIES OF...LEOMINSTER...FITCHBURG * UNTIL 900 PM EDT * AT 824 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL. THIS STORM WAS LOCATED NEAR ROYALSTON...OR ABOUT 15 MILES SOUTHWEST OF JAFFREY...AND MOVING EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GARDNER BY 845 PM EDT WESTMINSTER AND ASHBURNHAM BY 850 PM EDT FITCHBURG AND 7 MILES SOUTH OF ASHBY BY 855 PM EDT LUNENBURG...LEOMINSTER...8 MILES SOUTHWEST OF TOWNSEND AND 8 MILES WEST OF SHIRLEY BY 900 PM EDT LAT...LON 4272 7221 4254 7225 4245 7166 4267 7161 $$ STRAUSS
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:05 AM EDT | Severe Thunderstorm Warning | BOX | Worcester | 40 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, 2004Every 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.