Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 32, NWS Boston/Norton, MA

June 30, 2001Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 30, 2001, 5:18 PM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 42 min. 4 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: Jun 30, 2001, 5:18 PM EDT (21:18 UTC)
Expired: Jun 30, 2001, 6:00 PM EDT
In force: 42 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

Counties Essex County, MA, Middlesex County, MA

The radar

The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 21:17 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
Jun 30, 5:35 PM EDT	Thunderstorm Wind 50 E	Wilmington, MA
Jun 30, 5:58 PM EDT	Thunderstorm Wind 50 E	Lynnfield, MA
Jun 30, 5:58 PM EDT	Thunderstorm Wind 50 E	Reading, MA
Jun 30, 6:00 PM EDT	Hail 0.75	Peabody, 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 nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 9.3 hours before the alert went out and 138 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: 428 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 914 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 129 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 302118
SVRBOX
MAC009-017-302200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
518 PM EDT SAT JUN 30 2001

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL ESSEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING LAWRENCE
  NORTHERN MIDDLESEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING LOWELL

* UNTIL 600 PM EDT.

* AT 517 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER DUNSTABLE...OR ABOUT 5 MILES SOUTH OF
  NASHUA...MOVING EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE WOBURN...WILMINGTON...
  WESTFORD...TYNGSBORO...TEWKSBURY...READING...PEPPERELL...NORTH
  READING...NORTH ANDOVER...METHUEN...GROVELAND...GROTON...DRACUT...
  CHELMSFORD...CARLISLE...BURLINGTON...BOXFORD...BILLERICA AND
  ANDOVER.

SEVERE THUNDERSTORMS PRODUCE LARGE HAIL AND/OR WIND STRONG ENOUGH TO
KNOCK DOWN TREES AND POWER LINES. MOVE INDOORS AND STAY AWAY FROM
WINDOWS.

$$
DRV/GAF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 4:19 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	41 min
Jun 30, 4:55 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	35 min
Jun 30, 5:02 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	43 min
Jun 30, 5:27 PM EDT	Severe Thunderstorm Warning	BOX	Essex	48 min
Jun 30, 5:29 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	31 min
Jun 30, 5:57 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	48 min
Jun 30, 6:01 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	44 min
Jun 30, 6:07 PM EDT	Severe Thunderstorm Warning	BOX	Essex	38 min
Jun 30, 6:42 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	48 min
Jun 30, 7:28 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk	47 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2001 Every severe thunderstorm warning in 2001

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; radar from the NEXRAD Level II archive.