Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 90, NWS Boston/Norton, MA

August 11, 2012Franklin County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 11, 2012, 4:56 PM EDT for Franklin County, Massachusetts. It was in force for 49 min. 1 report 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 11, 2012, 4:56 PM EDT (20:56 UTC)
Expired: Aug 11, 2012, 5:45 PM EDT
In force: 49 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Franklin County, MA

The radar

The Albany radar (KENX), 95 km from the middle of the area, began a volume at 20:59 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 11, 5:11 PM EDT	TSTM WND DMG	Rowe, MA	FOUR TO FIVE INCH DIAMETER LIMBS DOWN ON A FARM ON DELL ROAD VIA HAM RADIO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.9 hours before the alert went out and 76 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 225 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

893 
WUUS51 KBOX 112056
SVRBOX
MAC011-112145-
/O.NEW.KBOX.SV.W.0090.120811T2056Z-120811T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
456 PM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 545 PM EDT

* AT 454 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 7 MILES WEST OF HAWLEY...OR 9
  MILES SOUTHEAST OF NORTH ADAMS...AND WAS MOVING NORTHEAST AT 20
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...CHARLEMONT...MONROE...
  ROWE...HEATH...COLRAIN AND LEYDEN.

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 4275 7296 4274 7293 4274 7259 4273 7256
      4254 7288 4256 7298 4263 7296 4266 7296
      4266 7299 4268 7299 4270 7296 4270 7303
TIME...MOT...LOC 2056Z 232DEG 19KT 4259 7300

$$

KJC

1 follow-up statement

703 
WWUS51 KBOX 112145
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
545 PM EDT SAT AUG 11 2012

MAC011-112155-
/O.EXP.KBOX.SV.W.0090.000000T0000Z-120811T2145Z/
FRANKLIN MA-
545 PM EDT SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FRANKLIN COUNTY
HAS EXPIRED...

LAT...LON 4275 7296 4274 7293 4274 7259 4273 7256
      4254 7288 4256 7298 4263 7296 4266 7296
      4266 7299 4268 7299 4270 7296 4270 7303
TIME...MOT...LOC 2145Z 232DEG 19KT 4275 7272

$$

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 9:21 PM EDT	Special Marine Warning	BOX		20 min
Aug 11, 1:13 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	50 min
Aug 11, 4:38 PM EDT	Special Weather Statement	BOX	Franklin	52 min
Aug 11, 5:14 PM EDT	Special Weather Statement	BOX	Hampshire	46 min
Aug 11, 6:09 PM EDT	Special Weather Statement	BOX	Hampshire	51 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.