Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 9, NWS Boston/Norton, MA

May 15, 2007Hampden County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 15, 2007, 5:51 PM EDT for Hampden County, Worcester County, Massachusetts. It was in force for 39 min. 3 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: May 15, 2007, 5:51 PM EDT (21:51 UTC)
Expired: May 15, 2007, 6:30 PM EDT
In force: 39 min
Issued by: NWS Boston/Norton, MA
Area: Counties, with a storm outline in the text

Counties Hampden County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 94 km from the middle of the area, began a volume at 21:52 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 15, 6:12 PM EDT	TSTM WND DMG	Ludlow, MA	LARGE BRANCHES DOWN
May 15, 6:17 PM EDT	TSTM WND DMG	New Braintree, MA	TREES DOWN
May 15, 6:17 PM EDT	TSTM WND DMG	North Brookfield, MA	TREES DOWN

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, 9.9 hours before the alert went out and 142 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1392 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 342 m²/s²
0-3 km storm-relative helicity: 400 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.

000 
WUUS51 KBOX 152150
SVRBOX
MAC013-027-152230-
/O.NEW.KBOX.SV.W.0009.070515T2151Z-070515T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
551 PM EDT TUE MAY 15 2007

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITY OF WORCESTER...
  SOUTHEASTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 630 PM EDT

* AT 548 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM NEW BRAINTREE TO LUDLOW...OR
  ALONG A LINE EXTENDING FROM 15 MILES EAST OF AMHERST TO 7 MILES
  EAST OF CHICOPEE...AND MOVING EAST AT 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WALES...SPENCER...EAST BROOKFIELD AND BROOKFIELD BY 600 PM EDT...
  LEICESTER...PAXTON AND HOLLAND BY 605 PM EDT...
  WORCESTER...STURBRIDGE AND SOUTHBRIDGE BY 610 PM EDT...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4217 7252 4220 7240 4219 7236 4221 7234
      4225 7221 4237 7219 4228 7169 4203 7192
      4203 7220

$$

MLE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 4:32 AM EDT	Red Flag Warning	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more	12 hr
May 15, 5:41 PM EDT	Severe Thunderstorm Warning	BOX	Hampshire	34 min
May 15, 6:44 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	46 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2007 Every severe thunderstorm warning in 2007

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.