Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Boston/Norton, MA

May 16, 2012Franklin County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 16, 2012, 8:57 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 63 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: May 16, 2012, 8:57 PM EDT (00:57 UTC)
Expired: May 16, 2012, 10:00 PM EDT
In force: 63 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Franklin County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 131 km from the middle of the area, began a volume at 00:58 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
May 16, 9:45 PM EDT	TSTM WND DMG	Montague, MA	LARGE BRANCHES DOWN ON TURNERS FALLS ROAD.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 16, 1:18 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 1.0 hours before the alert went out and 113 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: 23 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

349 
WUUS51 KBOX 170057
SVRBOX
MAC011-027-170200-
/O.NEW.KBOX.SV.W.0007.120517T0057Z-120517T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
857 PM EDT WED MAY 16 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  EASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...

* UNTIL 1000 PM EDT

* AT 853 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
  DEERFIELD...OR NEAR GREENFIELD...AND WAS MOVING EAST AT 25 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...MONTAGUE...BERNARDSTON...
  GILL...WENDELL...ERVING...NORTHFIELD...ORANGE...WARWICK...ATHOL...
  ROYALSTON...PHILLIPSTON...TEMPLETON AND GARDNER.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND SOUTHERN MASSACHUSETTS
AND SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4262 7274 4273 7243 4272 7221 4256 7188
      4247 7274
TIME...MOT...LOC 0057Z 255DEG 22KT 4256 7258

$$

FRANK

3 follow-up statements

656 
WWUS51 KBOX 170131
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
931 PM EDT WED MAY 16 2012

MAC011-027-170200-
/O.CON.KBOX.SV.W.0007.000000T0000Z-120517T0200Z/
WORCESTER MA-FRANKLIN MA-
931 PM EDT WED MAY 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR EASTERN FRANKLIN AND NORTHWESTERN WORCESTER COUNTIES...

AT 928 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR ORANGE...OR 14 MILES EAST OF GREENFIELD...MOVING EAST AT
25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ATHOL...ROYALSTON...PHILLIPSTON...TEMPLETON AND GARDNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND SOUTHERN MASSACHUSETTS
AND SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4258 7265 4273 7243 4271 7220 4256 7188
      4247 7274
TIME...MOT...LOC 0131Z 255DEG 22KT 4261 7231

$$

FRANK

339 
WWUS51 KBOX 170146
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
946 PM EDT WED MAY 16 2012

MAC011-027-170200-
/O.CON.KBOX.SV.W.0007.000000T0000Z-120517T0200Z/
WORCESTER MA-FRANKLIN MA-
946 PM EDT WED MAY 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR EAST CENTRAL FRANKLIN AND NORTHWESTERN WORCESTER COUNTIES...

AT 945 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR ATHOL...OR 15 MILES SOUTHWEST OF JAFFREY...MOVING EAST
AT 25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ROYALSTON...PHILLIPSTON...TEMPLETON AND GARDNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR NORTHERN CONNECTICUT AND SOUTHERN MASSACHUSETTS
AND SOUTHERN NEW HAMPSHIRE.

&&

LAT...LON 4250 7252 4256 7250 4271 7240 4271 7220
      4256 7188
TIME...MOT...LOC 0146Z 255DEG 22KT 4263 7219

$$

FRANK

159 
WWUS51 KBOX 170158
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
958 PM EDT WED MAY 16 2012

MAC011-027-170207-
/O.EXP.KBOX.SV.W.0007.000000T0000Z-120517T0200Z/
WORCESTER MA-FRANKLIN MA-
958 PM EDT WED MAY 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL FRANKLIN AND
NORTHWESTERN WORCESTER COUNTIES WILL EXPIRE AT 1000 PM EDT...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS.  HOWEVER...HEAVY RAIN...DANGEROUS CLOUD TO GROUND LIGHTNING 
AND SMALL HAIL ARE STILL EXPECTED WITH THE STORM.

LAT...LON 4250 7252 4256 7250 4271 7240 4271 7220
      4256 7188
TIME...MOT...LOC 0157Z 255DEG 22KT 4265 7210

$$


FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 8:09 PM EDT	Special Weather Statement	BOX	Franklin	66 min
May 16, 8:20 PM EDT	Dense Fog Advisory	BOX	Barnstable, Bristol, Dukes, Nantucket, Norfolk, Plymouth	7 hr
May 16, 8:23 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	52 min
May 16, 8:33 PM EDT	Special Weather Statement	BOX	Franklin	42 min
May 16, 8:53 PM EDT	Special Weather Statement	BOX	Franklin, Hampshire	67 min
May 16, 9:13 PM EDT	Special Weather Statement	BOX	Hampden, Hampshire	62 min
May 16, 9:39 PM EDT	Special Weather Statement	BOX	Worcester	66 min
May 16, 10:07 PM EDT	Special Weather Statement	BOX	Hampden, Worcester	53 min
May 17, 3:37 AM EDT	Frost Advisory	BOX	Franklin, Hampshire	27 hr
May 17, 3:43 AM EDT	Small Craft Advisory for Hazardous Seas	BOX		18 hr
May 17, 3:46 PM EDT	Small Craft Advisory for Hazardous Seas	BOX		6 hr

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.