Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

July 2, 2014Hampden County, Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 2, 2014, 4:17 PM EDT for Hampden County, Massachusetts; Capitol Planning Region, Connecticut. It was in force for 58 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 2, 2014, 4:17 PM EDT (20:17 UTC)
Expired: Jul 2, 2014, 5:15 PM EDT
In force: 58 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Capitol Planning Region, CT, Hampden County, MA

The radar

The Albany radar (KENX), 118 km from the middle of the area, began a volume at 20:18 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 2, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.3 hours before the alert went out and 109 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: 1263 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

900 
WUUS51 KBOX 022017
SVRBOX
CTC003-MAC013-022115-
/O.NEW.KBOX.SV.W.0021.140702T2017Z-140702T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
417 PM EDT WED JUL 2 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  SOUTHWESTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 515 PM EDT

* AT 416 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  SANDISFIELD TO NEAR CORNWALL BRIDGE...AND WAS MOVING EAST AT 30
  MPH.

* SOME LOCATIONS IMPACTED INCLUDE...
  SPRINGFIELD...CHICOPEE...WESTFIELD...HOLYOKE...WINDSOR...AGAWAM...
  WEST SPRINGFIELD...SIMSBURY...BLOOMFIELD...AVON...SOUTH HADLEY...
  SUFFIELD...WINDSOR LOCKS...GRANBY...CANTON...SOUTHWICK...
  BURLINGTON...EAST GRANBY...HARTLAND AND RUSSELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL. GO
INDOORS AND STAY AWAY FROM WINDOWS.  DRIVERS SHOULD PREPARE FOR LOW
VISIBILITY AND AVOID FLOODED ROADS.

MINOR FLOODING CAN BE EXPECTED FROM TORRENTIAL RAINFALL. DO NOT DRIVE
THROUGH FLOODED ROADS.

&&

LAT...LON 4219 7275 4218 7269 4221 7269 4223 7261
      4221 7260 4222 7254 4221 7254 4181 7274
      4177 7301 4180 7301 4182 7294 4189 7294
      4190 7291 4197 7289 4197 7303 4204 7301
      4204 7306 4210 7307
TIME...MOT...LOC 2016Z 249DEG 25KT 4211 7311 4176 7335 
$$

NOCERA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 1:31 PM EDT	Special Weather Statement	BOX	Franklin, Hampshire	44 min
Jul 2, 2:04 PM EDT	Flash Flood Warning	BOX	Franklin, Hampshire	116 min
Jul 2, 2:17 PM EDT	Flash Flood Watch	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	7 hr
Jul 2, 2:24 PM EDT	Special Weather Statement	BOX	Franklin	66 min
Jul 2, 3:07 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	53 min
Jul 2, 3:23 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	52 min
Jul 2, 3:38 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	52 min
Jul 2, 4:03 PM EDT	Areal Flood Advisory	BOX	Franklin	117 min
Jul 2, 4:42 PM EDT	Areal Flood Advisory	BOX	Franklin, Middlesex, Worcester	2 hr
Jul 2, 4:57 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	63 min
Jul 2, 5:06 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	54 min
Jul 2, 5:42 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	33 min
Jul 2, 5:33 PM EDT	Special Weather Statement	BOX		42 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2014 Severe Thunderstorm Warnings in Connecticut, 2014 Every severe thunderstorm warning 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.