Alert archive / New Hampshire / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 908
The Storm Prediction Center issued this severe thunderstorm watch at Nov 25, 2004, 11:00 AM EST for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 25, 2004, 11:00 AM EST (16:00 UTC)
- Expired
- Nov 25, 2004, 4:00 PM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 30 counties
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, Androscoggin County, ME, Cumberland County, ME, Oxford County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Providence County, RI, Caledonia County, VT, Lamoille County, VT, Orange County, VT, Washington County, VT, Windham County, VT, Windsor County, VT
The radar
The Boston radar (KBOX), 125 km from the middle of the area, began a volume at 16:00 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.
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 25, 12:56 PM EST | Severe Thunderstorm Warning | GYX | Grafton | 34 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 4.0 hours before the alert went out and 164 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
- 192 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 774 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 191 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 25, 8:55 AM EST | Severe Thunderstorm Watch | SPC | 5 hr | |
| Nov 25, 10:13 AM EST | Mesoscale Discussion | SPC | 2 hr | |
| Nov 25, 12:48 PM EST | Mesoscale Discussion | SPC | 117 min |
Nearby
Severe Thunderstorm Watches in New Hampshire, 2004Severe Thunderstorm Watches in Massachusetts, 2004Severe Thunderstorm Watches in Vermont, 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; radar from the NEXRAD Level II archive.