Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 111, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 19, 2011, 3:47 PM EDT for Essex County, Middlesex County, Suffolk County, Massachusetts. It was in force for 43 min. 6 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
- Aug 19, 2011, 3:47 PM EDT (19:47 UTC)
- Expired
- Aug 19, 2011, 4:30 PM EDT
- In force
- 43 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
Counties Essex County, MA, Middlesex County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 70 km from the middle of the area, began a volume at 19:47 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 |
|---|---|---|---|
| Aug 19, 3:49 PM EDT | HAIL 0.75 | Lynn, MA | |
| Aug 19, 3:50 PM EDT | TSTM WND DMG | Lynn, MA | TREES DOWN ON LYNN SHORE DRIVE |
| Aug 19, 3:50 PM EDT | HAIL 0.75 | Salem, MA | |
| Aug 19, 4:04 PM EDT | TSTM WND DMG | Salem, MA | TREE DOWN ON HOUSE ON BROADWAY ST |
| Aug 19, 4:09 PM EDT | TSTM WND DMG | Salem, MA | SEVERAL LARGE TREES DOWN ON RAYMOND AVENUE |
| Aug 19, 4:28 PM EDT | TSTM WND DMG | Lynn, MA | TREES DOWN ON LYNN SHORE DRIVE |
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, 7.8 hours before the alert went out and 119 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
- 1077 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 684 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
312
WUUS51 KBOX 191947
SVRBOX
MAC009-017-025-192030-
/O.NEW.KBOX.SV.W.0111.110819T1947Z-110819T2030Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
347 PM EDT FRI AUG 19 2011
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN ESSEX COUNTY IN EASTERN MASSACHUSETTS...
THIS INCLUDES THE CITIES OF...LYNN...GLOUCESTER...BEVERLY...
EXTREME NORTHEASTERN SUFFOLK COUNTY IN EASTERN MASSACHUSETTS...
EXTREME EAST CENTRAL MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
* UNTIL 430 PM EDT
* AT 343 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
LYNN...AND WAS MOVING NORTHEAST AT 25 MPH.
* SOME LOCATIONS IN THE WARNING INCLUDE...SWAMPSCOTT...PEABODY...
MARBLEHEAD...DANVERS...SALEM...WENHAM...HAMILTON...MANCHESTER...
ESSEX...IPSWICH AND ROCKPORT.
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 4257 7065 4259 7068 4255 7078 4250 7081
4250 7082 4254 7080 4254 7085 4249 7085
4248 7082 4245 7093 4243 7090 4241 7091
4245 7095 4242 7097 4246 7104 4270 7087
4270 7077 4266 7069 4270 7063 4264 7057
TIME...MOT...LOC 1948Z 219DEG 23KT 4248 7092
$$
JWD3 follow-up statements
300
WWUS51 KBOX 191956
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
356 PM EDT FRI AUG 19 2011
MAC009-017-025-192030-
/O.CON.KBOX.SV.W.0111.000000T0000Z-110819T2030Z/
MIDDLESEX MA-ESSEX MA-SUFFOLK MA-
356 PM EDT FRI AUG 19 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EXTREME NORTHEASTERN SUFFOLK...SOUTHEASTERN ESSEX AND EXTREME
EAST CENTRAL MIDDLESEX COUNTIES...
AT 355 PM EDT...THE SEVERE THUNDERSTORM WAS LOCATED NEAR LYNN AND
WAS MOVING NORTHEAST AT 25 MPH. PENNY SIZED HAIL WAS RECENTLY
REPORTED IN LYNN BY AMATEUR RADIO OPERATORS AND MANY REPORTS OF PEA
SIZED HAIL ELSEWHERE.
THERE HAVE ALSO BEEN REPORTS OF MINOR STREET FLOODING DUE TO
TORRENTIAL RAINFALL.
OTHER LOCATIONS IN THE WARNING INCLUDE DANVERS...SALEM...BEVERLY...
WENHAM...HAMILTON...MANCHESTER...ESSEX...IPSWICH...GLOUCESTER AND
ROCKPORT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4257 7065 4259 7068 4255 7078 4250 7081
4250 7082 4254 7080 4254 7085 4249 7085
4248 7082 4245 7093 4243 7090 4241 7091
4245 7095 4242 7097 4246 7104 4270 7087
4270 7077 4266 7069 4270 7063 4264 7057
TIME...MOT...LOC 1955Z 219DEG 23KT 4251 7088
$$
JWD364
WWUS51 KBOX 192020 RRA
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
420 PM EDT FRI AUG 19 2011
MAC017-025-192029-
/O.CAN.KBOX.SV.W.0111.000000T0000Z-110819T2030Z/
MIDDLESEX MA-SUFFOLK MA-
420 PM EDT FRI AUG 19 2011
...THE SEVERE THUNDERSTORM WARNING FOR SUFFOLK AND MIDDLESEX COUNTIES
IS CANCELLED...
SEVERE THUNDERSTORMS HAVE MOVED NORTH OF THE AREA.
&&
LAT...LON 4257 7065 4259 7068 4255 7078 4252 7080
4252 7081 4254 7080 4254 7085 4253 7085
4253 7087 4254 7087 4254 7088 4254 7089
4259 7092 4270 7087 4270 7077 4266 7069
4270 7063 4264 7057
TIME...MOT...LOC 2019Z 212DEG 10KT 4259 7079
$$
MAC009-192030-
/O.CON.KBOX.SV.W.0111.000000T0000Z-110819T2030Z/
ESSEX MA-
420 PM EDT FRI AUG 19 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL ESSEX COUNTY...
AT 419 PM EDT...THE SEVERE THUNDERSTORM WAS NEAR BEVERLY AND WAS
MOVING NORTHEAST AT 10 MPH. IT IS CAPABLE OF PRODUCING PENNY SIZE
HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE ROCKPORT...IPSWICH...
GLOUCESTER AND ESSEX.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4257 7065 4259 7068 4255 7078 4252 7080
4252 7081 4254 7080 4254 7085 4253 7085
4253 7087 4254 7087 4254 7088 4254 7089
4259 7092 4270 7087 4270 7077 4266 7069
4270 7063 4264 7057
TIME...MOT...LOC 2019Z 212DEG 10KT 4259 7079
$$
JWD218
WWUS51 KBOX 192028
SVSBOX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
428 PM EDT FRI AUG 19 2011
MAC009-192037-
/O.EXP.KBOX.SV.W.0111.000000T0000Z-110819T2030Z/
ESSEX MA-
428 PM EDT FRI AUG 19 2011
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ESSEX COUNTY WILL
EXPIRE AT 430 PM EDT...
THE SEVERE THUNDERSTORM WEAKENED AND WAS NO LONGER CAPABLE OF
PRODUCING LARGE HAIL OR DAMAGING WINDS.
HOWEVER...THUNDERSTORMS OVER THE NORTH SHORE WILL PRODUCE TORRENTIAL
RAINFALL AND FREQUENT LIGHTNING. STAY INDOORS UNTIL AT LEAST 30
MINUTES AFTER THE STORMS PASS.
&&
LAT...LON 4257 7065 4259 7068 4255 7078 4252 7080
4252 7081 4254 7080 4254 7085 4253 7085
4253 7087 4254 7087 4254 7088 4254 7089
4259 7092 4270 7087 4270 7077 4266 7069
4270 7063 4264 7057
TIME...MOT...LOC 2027Z 212DEG 10KT 4261 7077
$$
JWDThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 12:51 PM EDT | Areal Flood Advisory | BOX | Franklin | 3 hr |
| Aug 19, 1:56 PM EDT | Special Weather Statement | BOX | Franklin | 34 min |
| Aug 19, 2:02 PM EDT | Special Weather Statement | BOX | Worcester | 43 min |
| Aug 19, 2:14 PM EDT | Severe Thunderstorm Warning | BOX | Franklin | 46 min |
| Aug 19, 2:27 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 35 min |
| Aug 19, 2:33 PM EDT | Special Weather Statement | BOX | Worcester | 42 min |
| Aug 19, 2:36 PM EDT | Flash Flood Warning | BOX | Franklin | 4 hr |
| Aug 19, 2:41 PM EDT | Special Weather Statement | BOX | Norfolk | 34 min |
| Aug 19, 2:57 PM EDT | Special Weather Statement | BOX | Franklin | 48 min |
| Aug 19, 2:57 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk | 25 min |
| Aug 19, 3:06 PM EDT | Areal Flood Advisory | BOX | Middlesex, Norfolk, Suffolk | 54 min |
| Aug 19, 3:07 PM EDT | Special Weather Statement | BOX | Worcester | 53 min |
| Aug 19, 3:14 PM EDT | Areal Flood Advisory | BOX | Worcester | 75 min |
| Aug 19, 3:15 PM EDT | Special Marine Warning | BOX | 45 min | |
| Aug 19, 3:18 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk | 27 min |
| Aug 19, 3:18 PM EDT | Severe Thunderstorm Warning | BOX | Franklin | 27 min |
| Aug 19, 3:22 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 33 min |
| Aug 19, 3:29 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex | 36 min |
| Aug 19, 3:36 PM EDT | Areal Flood Advisory | BOX | Essex, Middlesex, Suffolk | 72 min |
| Aug 19, 3:39 PM EDT | Special Weather Statement | BOX | Essex | 66 min |
| Aug 19, 3:53 PM EDT | Special Marine Warning | BOX | 67 min | |
| Aug 19, 3:57 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 23 min |
| Aug 19, 4:02 PM EDT | Areal Flood Advisory | BOX | Middlesex, Worcester | 29 min |
| Aug 19, 4:22 PM EDT | Special Marine Warning | BOX | 53 min | |
| Aug 19, 4:36 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire | 39 min |
| Aug 19, 4:57 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 63 min |
| Aug 19, 5:02 PM EDT | Areal Flood Advisory | BOX | Franklin, Hampshire | 3 hr |
| Aug 19, 5:07 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 38 min |
| Aug 19, 5:34 PM EDT | Severe Thunderstorm Warning | BOX | Franklin | 26 min |
| Aug 19, 6:43 PM EDT | Special Weather Statement | BOX | Hampshire | 62 min |
| Aug 19, 7:25 PM EDT | Special Weather Statement | BOX | Hampden | 50 min |
| Aug 19, 7:30 PM EDT | Areal Flood Advisory | BOX | Hampden | 64 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.