Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 72, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 2012, 4:38 PM EDT for Middlesex County, Worcester County, Massachusetts. It was in force for 47 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 5, 2012, 4:38 PM EDT (20:38 UTC)
- Expired
- Aug 5, 2012, 5:25 PM EDT
- In force
- 47 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 71 km from the middle of the area, began a volume at 20:40 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
Chatham, MA (KCHH), launched 12:00Z, 8.6 hours before the alert went out and 159 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
- 1615 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 492 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
379 WUUS51 KBOX 052038 SVRBOX MAC017-027-052130- /O.NEW.KBOX.SV.W.0072.120805T2038Z-120805T2130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 438 PM EDT SUN AUG 5 2012 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS... CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS... * UNTIL 530 PM EDT * AT 436 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 CLINTON...OR 8 MILES SOUTHEAST OF LEOMINSTER...AND WAS MOVING NORTHEAST AT 30 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE...BOLTON...HARVARD... BOXBOROUGH...ACTON...LITTLETON...WESTFORD...CARLISLE AND CHELMSFORD. 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 4266 7141 4254 7129 4239 7166 4245 7172 TIME...MOT...LOC 2038Z 234DEG 23KT 4244 7166 $$ WTB
2 follow-up statements
500 WWUS51 KBOX 052115 SVSBOX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 515 PM EDT SUN AUG 5 2012 MAC017-027-052130- /O.CON.KBOX.SV.W.0072.000000T0000Z-120805T2130Z/ MIDDLESEX MA-WORCESTER MA- 515 PM EDT SUN AUG 5 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR EAST CENTRAL WORCESTER AND CENTRAL MIDDLESEX COUNTIES... AT 510 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WESTFORD...OR 8 MILES SOUTHWEST OF LOWELL...MOVING NORTHEAST AT 25 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHELMSFORD LAT...LON 4266 7141 4254 7129 4239 7166 4245 7172 TIME...MOT...LOC 2115Z 234DEG 23KT 4258 7140 $$ WTB
068 WWUS51 KBOX 052125 SVSBOX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 525 PM EDT SUN AUG 5 2012 MAC017-027-052135- /O.CAN.KBOX.SV.W.0072.000000T0000Z-120805T2130Z/ MIDDLESEX MA-WORCESTER MA- 525 PM EDT SUN AUG 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WORCESTER AND CENTRAL MIDDLESEX COUNTIES IS CANCELLED... THUNDERSTORMS HAVE MOVED OUT OF THE WARNED AREA. LAT...LON 4266 7141 4254 7129 4239 7166 4245 7172 TIME...MOT...LOC 2125Z 234DEG 23KT 4262 7133 $$ WTB
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 4:03 AM EDT | Flash Flood Watch | BOX | Franklin, Hampden, Hampshire | 19 hr |
| Aug 5, 4:08 AM EDT | Small Craft Advisory | BOX | 27 hr | |
| Aug 5, 2:02 PM EDT | Special Weather Statement | BOX | Hampden, Hampshire | 58 min |
| Aug 5, 3:03 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 42 min |
| Aug 5, 3:33 PM EDT | Special Weather Statement | BOX | Worcester | 57 min |
| Aug 5, 4:20 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 40 min |
| Aug 5, 5:05 PM EDT | Severe Thunderstorm Warning | BOX | Hampden, Worcester | 40 min |
| Aug 5, 5:30 PM EDT | Special Marine Warning | BOX | 51 min | |
| Aug 5, 5:46 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 29 min |
| Aug 5, 7:52 PM EDT | Special Weather Statement | BOX | Hampden | 83 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 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.