Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 68, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 23, 2011, 10:21 AM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 39 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 23, 2011, 10:21 AM EDT (14:21 UTC)
- Expired
- Jul 23, 2011, 11:00 AM EDT
- In force
- 39 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Norfolk County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 29 km from the middle of the area, began a volume at 14:24 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 23, 10:30 AM EDT | TSTM WND DMG | Brockton, MA | TREES AND WIRES DOWN IN SOUTH BROCKTON |
| Jul 23, 10:35 AM EDT | TSTM WND GST 58 | Brockton, MA | MEASURED AT HIGH SCHOOL |
| Jul 23, 10:42 AM EDT | TSTM WND DMG | Brockton, MA | TREES DOWN ON ROUTE 14 AT BROCKTON WHITMAN LINE |
| Jul 23, 10:50 AM EDT | TSTM WND DMG | Brockton, MA | TREES AND WIRES DOWN ON FRENCH AVENUE |
| Jul 23, 10:55 AM EDT | TSTM WND DMG | Brockton, MA | LIVE WIRES DOWN ON ASH STREET IN SW BROCKTON |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 2.4 hours before the alert went out and 84 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2396 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
973 WUUS51 KBOX 231421 SVRBOX MAC021-023-231500- /O.NEW.KBOX.SV.W.0068.110723T1421Z-110723T1500Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA 1021 AM EDT SAT JUL 23 2011 THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL NORFOLK COUNTY IN EASTERN MASSACHUSETTS... NORTHERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS... THIS INCLUDES THE CITY OF BROCKTON... * UNTIL 1100 AM EDT * AT 1020 AM 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 BROCKTON...AND WAS MOVING EAST AT 30 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE...ABINGTON...WHITMAN... ROCKLAND...HANSON...HANOVER...PEMBROKE AND MARSHFIELD. 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. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT LIGHTNING WAS OCCURRING WITH THIS STORM. GET INDOORS OR INSIDE A VEHICLE NOW! DO NOT SEEK SHELTER UNDER TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 4201 7067 4205 7105 4214 7104 4215 7068 TIME...MOT...LOC 1421Z 271DEG 25KT 4209 7103 $$ THOMPSON
1 follow-up statement
393 WWUS51 KBOX 231437 SVSBOX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TAUNTON MA 1037 AM EDT SAT JUL 23 2011 MAC021-023-231500- /O.CON.KBOX.SV.W.0068.000000T0000Z-110723T1500Z/ NORFOLK MA-PLYMOUTH MA- 1037 AM EDT SAT JUL 23 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT FOR NORTHERN PLYMOUTH AND EAST CENTRAL NORFOLK COUNTIES... AT 1033 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WHITMAN AND BROCKTON...MOVING EAST AT 30 MPH. THERE HAS BEEN A REPORT OF DOWNED TREES AND WIRES IN THE SOUTH SIDE OF BROCKTON. THIS STORM HAS ALSO BEEN PRODUCING VERY FREQUENT LIGHTNING. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HANSON...HANOVER...PEMBROKE AND MARSHFIELD. THIS IS A DANGEROUS STORM WITH STRONG WINDS...FREQUENT CLOUD TO GROUND LIGHTNING AND VERY HEAVY DOWNPOURS. PEOPLE IN EXPOSED AREAS SUCH AS ON AREA BEACHES IN THE MARSHFIELD AND DUXBURY AREAS SHOULD SEEK INSIDE SHELTER FROM LIGHTNING NOW. LAT...LON 4201 7067 4205 7105 4214 7104 4215 7068 TIME...MOT...LOC 1435Z 271DEG 25KT 4209 7090 $$ THOMPSON
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 3:38 AM EDT | Heat Advisory | BOX | Bristol, Hampden, Hampshire, Middlesex, Norfolk, Plymouth and 2 more | 13 hr |
| Jul 23, 4:58 AM EDT | Special Weather Statement | BOX | Franklin | 32 min |
| Jul 23, 6:36 AM EDT | Special Weather Statement | BOX | Middlesex | 24 min |
| Jul 23, 6:39 AM EDT | Special Weather Statement | BOX | Franklin | 36 min |
| Jul 23, 6:52 AM EDT | Special Weather Statement | BOX | Franklin | 23 min |
| Jul 23, 7:29 AM EDT | Special Weather Statement | BOX | Worcester | 31 min |
| Jul 23, 8:15 AM EDT | Special Weather Statement | BOX | Middlesex, Norfolk, Suffolk | 45 min |
| Jul 23, 9:14 AM EDT | Special Weather Statement | BOX | Norfolk | 46 min |
| Jul 23, 9:45 AM EDT | Special Weather Statement | BOX | Suffolk | 45 min |
| Jul 23, 10:00 AM EDT | Special Weather Statement | BOX | Norfolk | 45 min |
| Jul 23, 10:14 AM EDT | Special Marine Warning | BOX | 26 min | |
| Jul 23, 10:45 AM EDT | Special Marine Warning | BOX | 45 min | |
| Jul 23, 10:50 AM EDT | Severe Thunderstorm Warning | BOX | Plymouth | 55 min |
| Jul 23, 11:02 AM EDT | Severe Thunderstorm Warning | BOX | Plymouth | 28 min |
| Jul 23, 11:16 AM EDT | Special Marine Warning | BOX | 59 min | |
| Jul 23, 11:28 AM EDT | Special Marine Warning | BOX | 62 min | |
| Jul 23, 11:38 AM EDT | Special Weather Statement | BOX | Plymouth | 37 min |
| Jul 23, 11:56 AM EDT | Special Weather Statement | BOX | Bristol | 64 min |
| Jul 23, 12:00 PM EDT | Special Marine Warning | BOX | 30 min | |
| Jul 23, 12:15 PM EDT | Special Marine Warning | BOX | 45 min | |
| Jul 23, 12:20 PM EDT | Special Weather Statement | BOX | Plymouth | 40 min |
| Jul 23, 12:32 PM EDT | Special Marine Warning | BOX | 43 min | |
| Jul 23, 12:46 PM EDT | Special Marine Warning | BOX | 32 min | |
| Jul 23, 1:01 PM EDT | Severe Thunderstorm Warning | BOX | Barnstable, Dukes | 29 min |
| Jul 23, 1:09 PM EDT | Special Marine Warning | BOX | 51 min | |
| Jul 23, 1:32 PM EDT | Severe Thunderstorm Warning | BOX | Nantucket | 43 min |
| Jul 23, 1:44 PM EDT | Special Marine Warning | BOX | 61 min | |
| Jul 23, 2:07 PM EDT | Special Marine Warning | BOX | 38 min | |
| Jul 23, 2:14 PM EDT | Special Weather Statement | BOX | Barnstable | 31 min |
| Jul 23, 2:29 PM EDT | Special Marine Warning | BOX | 31 min | |
| Jul 23, 2:51 PM EDT | Special Marine Warning | BOX | 39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.