Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 92, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 11, 2012, 8:18 PM EDT for Hillsborough County, New Hampshire; Middlesex County, Worcester County, Massachusetts. It was in force for 30 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 11, 2012, 8:18 PM EDT (00:18 UTC)
- Expired
- Aug 11, 2012, 8:48 PM EDT
- In force
- 30 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Worcester County, MA, Hillsborough County, NH
The radar
The Boston radar (KBOX), 100 km from the middle of the area, began a volume at 00:20 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
Gray, ME (KGYX), launched 00:00Z, 0.3 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
- 280 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 518 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
842
WUUS51 KBOX 120018
SVRBOX
MAC017-027-NHC011-120100-
/O.NEW.KBOX.SV.W.0092.120812T0018Z-120812T0100Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
818 PM EDT SAT AUG 11 2012
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
THIS INCLUDES THE CITY OF FITCHBURG...
NORTHWESTERN MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
SOUTHEASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...
THIS INCLUDES THE CITY OF NASHUA...
* UNTIL 900 PM EDT
* AT 818 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR ASHBURNHAM...OR NEAR
FITCHBURG...AND WAS MOVING NORTHEAST AT 25 MPH.
* SOME LOCATIONS IN THE WARNING INCLUDE...ASHBY...LUNENBURG...NEW
IPSWICH...GREENVILLE...TOWNSEND...MASON...BROOKLINE...PEPPERELL...
HOLLIS...MILFORD...MERRIMACK...LITCHFIELD...HUDSON...BEDFORD AND
AMHERST.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL
AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...
INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER
TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.
&&
LAT...LON 4297 7148 4293 7144 4284 7143 4283 7138
4280 7136 4278 7135 4277 7131 4254 7185
4269 7199 4271 7194 4271 7193 4272 7193
TIME...MOT...LOC 0018Z 237DEG 21KT 4263 7185
$$
KJC1 follow-up statement
166
WWUS51 KBOX 120048
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
848 PM EDT SAT AUG 11 2012
MAC017-027-NHC011-120059-
/O.CAN.KBOX.SV.W.0092.000000T0000Z-120812T0100Z/
MIDDLESEX MA-WORCESTER MA-HILLSBOROUGH NH-
848 PM EDT SAT AUG 11 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HILLSBOROUGH...
NORTH CENTRAL WORCESTER AND NORTHWESTERN MIDDLESEX COUNTIES IS
CANCELLED...
LAT...LON 4297 7148 4293 7144 4284 7143 4283 7138
4280 7136 4278 7135 4277 7131 4254 7185
4269 7199 4271 7194 4271 7193 4272 7193
TIME...MOT...LOC 0049Z 237DEG 21KT 4273 7164
$$
KJCThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:13 PM EDT | Special Weather Statement | BOX | Hillsborough | 47 min |
| Aug 11, 8:42 PM EDT | Special Weather Statement | BOX | Cheshire | 63 min |
| Aug 12, 4:27 PM EDT | Special Weather Statement | BOX | Hillsborough | 33 min |
| Aug 12, 7:32 AM EDT | Areal Flood Advisory | BOX | Hampden, Hampshire, Worcester | 3 hr |
| Aug 12, 2:53 PM EDT | Special Weather Statement | BOX | Worcester | 37 min |
| Aug 12, 3:26 PM EDT | Special Weather Statement | BOX | Worcester | 64 min |
| Aug 12, 4:24 PM EDT | Areal Flood Advisory | BOX | Middlesex, Worcester | 55 min |
| Aug 12, 6:38 PM EDT | Special Weather Statement | BOX | Suffolk | 22 min |
| Aug 12, 7:03 PM EDT | Areal Flood Advisory | BOX | Essex | 39 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2012Severe Thunderstorm Warnings in New Hampshire, 2012Every severe thunderstorm warning in 2012
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.