Alert archive / Massachusetts / Tornado Warnings in 1999

Tornado Warning 1, NWS Boston/Norton, MA

July 6, 1999Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Jul 6, 1999, 6:26 PM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 34 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 6, 1999, 6:26 PM EDT (22:26 UTC)
Expired: Jul 6, 1999, 7:00 PM EDT
In force: 34 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

Counties Norfolk County, MA, Plymouth County, MA

What was reported inside it

Time	Report	Where	Remark
Jul 6, 6:45 PM EDT	Thunderstorm Wind 60	Whitman, MA
Jul 6, 6:55 PM EDT	Hail 0.75	Avon, MA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 6, 3:00 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 10.4 hours before the alert went out and 94 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: 457 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1321 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

186 
WFUS1 KBOS 062226 RRA
TORBOS
MAC021-023-062300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
626 PM EDT TUE JUL 6 1999

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL NORFOLK COUNTY IN MASSACHUSETTS
  CENTRAL PLYMOUTH COUNTY IN MASSACHUSETTS
  INCLUDING BROCKTON

* UNTIL 700 PM EDT.

* AT 620 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO OVER AVON...OR ABOUT 4 MILES NORTH OF BROCKTON...MOVING
  SOUTHEAST AT 25 MPH.

* OTHER LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE WHITMAN...WEST
  BRIDGEWATER...ROCKLAND...HOLBROOK...HANSON...EAST BRIDGEWATER...
  AVON AND ABINGTON.

THIS IS A DANGEROUS STORM - TAKE COVER NOW IN THE BASEMENT OR A SMALL
INTERIOR ROOM ON THE LOWEST FLOOR. PROTECT YOUR BODY FROM FLYING
DEBRIS WITH BLANKETS OR PILLOWS.
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:39 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	51 min
Jul 6, 4:22 PM EDT	Severe Thunderstorm Warning	BOX	Hampshire	38 min
Jul 6, 4:27 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	63 min
Jul 6, 4:31 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	29 min
Jul 6, 4:42 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	63 min
Jul 6, 4:55 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	65 min
Jul 6, 4:58 PM EDT	Severe Thunderstorm Warning	BOX	Hampshire	62 min
Jul 6, 5:15 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	60 min
Jul 6, 5:33 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Suffolk	57 min
Jul 6, 5:57 PM EDT	Severe Thunderstorm Warning	BOX	Plymouth	63 min
Jul 6, 6:59 PM EDT	Tornado Warning	BOX	Plymouth	46 min
Jul 6, 7:20 PM EDT	Severe Thunderstorm Warning	BOX	Plymouth	25 min
Jul 6, 7:45 PM EDT	Severe Thunderstorm Warning	BOX	Barnstable, Plymouth	30 min

Nearby

Tornado Warnings in Massachusetts, 1999 Every tornado warning in 1999 Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.