Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 3, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at May 7, 2011, 1:08 PM EDT for Middlesex County, Norfolk County, Massachusetts. It was in force for 52 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
- May 7, 2011, 1:08 PM EDT (17:08 UTC)
- Expired
- May 7, 2011, 2:00 PM EDT
- In force
- 52 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Middlesex County, MA, Norfolk County, MA
The radar
The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 17:08 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, 5.1 hours before the alert went out and 130 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
- 72 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 793 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
538 WUUS51 KBOX 071708 SVRBOX MAC017-021-071800- /O.NEW.KBOX.SV.W.0003.110507T1708Z-110507T1800Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 108 PM EDT SAT MAY 7 2011 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL NORFOLK COUNTY IN EASTERN MASSACHUSETTS... SOUTH CENTRAL MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS... * UNTIL 200 PM EDT * AT 104 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR ASHLAND...OR NEAR FRAMINGHAM...AND WAS MOVING EAST AT 20 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE...SHERBORN AND DOVER. 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 4228 7125 4221 7124 4220 7147 4227 7149 TIME...MOT...LOC 1708Z 268DEG 16KT 4224 7146 $$ FIELD
1 follow-up statement
352
WWUS51 KBOX 071738
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
138 PM EDT SAT MAY 7 2011
MAC017-021-071800-
/O.CON.KBOX.SV.W.0003.000000T0000Z-110507T1800Z/
MIDDLESEX MA-NORFOLK MA-
138 PM EDT SAT MAY 7 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTH CENTRAL NORFOLK AND SOUTH CENTRAL MIDDLESEX COUNTIES...
AT 134 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH
DIAMETER HAIL. THIS STORM WAS LOCATED NEAR DOVER...OR 8 MILES
SOUTHWEST OF NEWTON...MOVING EAST AT 20 MPH. PENNY SIZE HAIL
COVERING THE GROUND HAS BEEN REPORTED BY A TRAINED SPOTTER IN
NATICK.
LAT...LON 4222 7133 4227 7136 4228 7132 4228 7125
4221 7124
TIME...MOT...LOC 1737Z 264DEG 16KT 4225 7129
$$
FIELDThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 11:32 AM EDT | Special Weather Statement | BOX | Worcester | 43 min |
| May 7, 12:28 PM EDT | Special Weather Statement | BOX | Middlesex | 32 min |
| May 7, 12:31 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 29 min |
| May 7, 1:32 PM EDT | Special Weather Statement | BOX | Norfolk | 43 min |
| May 7, 2:08 PM EDT | Special Weather Statement | BOX | Norfolk | 37 min |
| May 7, 4:53 PM EDT | Special Weather Statement | BOX | Middlesex | 52 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2011Every severe thunderstorm warning in 2011
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.