Alert archive / Massachusetts / Tornado Warnings in 2014

Tornado Warning 3, NWS Boston/Norton, MA

July 15, 2014Middlesex County, Massachusetts; Hillsborough County, New Hampshire

NWS Boston/Norton, MA issued this tornado warning at Jul 15, 2014, 4:04 PM EDT for Middlesex County, Massachusetts; Hillsborough County, New Hampshire. It was in force for 22 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: Jul 15, 2014, 4:04 PM EDT (20:04 UTC)
Expired: Jul 15, 2014, 4:26 PM EDT
In force: 22 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Middlesex County, MA, Hillsborough County, NH

The radar

The Boston radar (KBOX), 91 km from the middle of the area, began a volume at 20:05 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

Gray, ME (KGYX), launched 12:00Z, 8.1 hours before the alert went out and 154 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: 318 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 492 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

458 
WFUS51 KBOX 152004
TORBOX
MAC017-NHC011-152100-
/O.NEW.KBOX.TO.W.0003.140715T2004Z-140715T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
404 PM EDT TUE JUL 15 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS...
  SOUTHEASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 500 PM EDT
    
* AT 404 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED
  OVER TYNGSBOROUGH...OR NEAR NASHUA...AND WAS MOVING NORTHEAST AT 25
  MPH.

* SOME LOCATIONS IMPACTED INCLUDE...
  NASHUA...DRACUT...HUDSON...PELHAM...TYNGSBOROUGH AND DUNSTABLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! DO NOT WAIT TO SEE THE TORNADO. GO TO A BASEMENT OR
INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING...AWAY FROM
WINDOWS. IF IN A VEHICLE...A MOBILE HOME OR OUTDOORS...GET TO THE
CLOSEST SHELTER. PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4280 7136 4278 7136 4277 7135 4276 7127
      4274 7125 4272 7125 4265 7146 4270 7149
      4283 7140
TIME...MOT...LOC 2004Z 227DEG 23KT 4270 7143 
$$

SIPPRELL

1 follow-up statement

734 
WWUS51 KBOX 152026
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
426 PM EDT TUE JUL 15 2014

MAC017-NHC011-152035-
/O.CAN.KBOX.TO.W.0003.000000T0000Z-140715T2100Z/
MIDDLESEX MA-HILLSBOROUGH NH-
426 PM EDT TUE JUL 15 2014

...THE TORNADO WARNING FOR NORTH CENTRAL MIDDLESEX AND SOUTHEASTERN
HILLSBOROUGH COUNTIES IS CANCELED...
    
THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING 
HAS BEEN CANCELLED. HOWEVER...GUSTY DAMAGING WINDS AND HEAVY RAIN 
REMAIN LIKELY AND A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT 
FOR THE AREA.

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR 
NORTHEASTERN MIDDLESEX COUNTY AND NORTHWESTERN ESSEX COUNTY IN 
NORTHEAST MASSACHUSETTS...AS WELL AS SOUTHEASTERN HILLSBOROUGH 
COUNTY IN SOUTHERN NEW HAMPSHIRE.

LAT...LON 4280 7136 4278 7136 4277 7135 4276 7127
      4274 7125 4272 7125 4265 7146 4270 7149
      4283 7140
TIME...MOT...LOC 2023Z 227DEG 23KT 4279 7129 

$$

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 2:08 PM EDT	Special Weather Statement	BOX	Hampden	22 min
Jul 15, 2:23 PM EDT	Special Weather Statement	BOX	Worcester	22 min
Jul 15, 2:37 PM EDT	Flash Flood Warning	BOX	Franklin, Hampden, Hampshire, Worcester	113 min
Jul 15, 2:41 PM EDT	Special Weather Statement	BOX	Hampden	34 min
Jul 15, 2:53 PM EDT	Special Weather Statement	BOX	Worcester	37 min
Jul 15, 3:25 PM EDT	Special Weather Statement	BOX	Worcester	50 min
Jul 15, 4:01 PM EDT	Special Weather Statement	BOX	Middlesex	29 min
Jul 15, 4:19 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	41 min
Jul 15, 4:30 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	34 min
Jul 15, 4:31 PM EDT	Flash Flood Warning	BOX	Essex, Middlesex, Worcester	119 min
Jul 15, 4:41 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	21 min
Jul 15, 4:45 PM EDT	Special Marine Warning	BOX		90 min
Jul 15, 4:59 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	46 min
Jul 15, 2:45 PM EDT	Special Weather Statement	BOX	Cheshire	30 min

Nearby

Tornado Warnings in Massachusetts, 2014 Tornado Warnings in New Hampshire, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.