Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 55, NWS Boston/Norton, MA

July 18, 2000Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 2000, 2:29 PM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 46 min. 6 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 18, 2000, 2:29 PM EDT (18:29 UTC)
Expired
Jul 18, 2000, 3:15 PM EDT
In force
46 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 18:30 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

TimeReportWhereRemark
Jul 18, 2:29 PM EDTHail 0.75Westford, MA
Jul 18, 2:55 PM EDTHail 1Wilmington, MA
Jul 18, 3:02 PM EDTHail 1Stow, MA
Jul 18, 3:08 PM EDTHail 1.25Danvers, MA
Jul 18, 3:10 PM EDTThunderstorm Wind 50 ESalem, MA
Jul 18, 3:25 PM EDTHail 1.75Newton, 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.

IssuedProductOfficeLasted
Jul 18, 11:30 AM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 6.5 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-pSkew-T log-p diagram, Chatham, MA at 12:00Z on 2000-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 118 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 2000-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
118 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
54 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 181830
SVRBOS
MAC009-017-181915-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
229 PM EDT TUE JUL 18 2000

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ESSEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING LYNN
  EAST CENTRAL MIDDLESEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING LOWELL

* UNTIL 315 PM EDT.

* AT 225 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER WESTFORD...OR ABOUT 8 MILES WEST OF
  LOWELL...MOVING EAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE WOBURN...WILMINGTON...
  WAKEFIELD...TOPSFIELD...TEWKSBURY...STONEHAM...SAUGUS...
  READING...  PEABODY...MIDDLETON...LYNNFIELD...DANVERS...           
  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.

$$

DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 12:24 PM EDTSevere Thunderstorm WarningBOXWorcester36 min
Jul 18, 1:43 PM EDTSevere Thunderstorm WarningBOXMiddlesex47 min
Jul 18, 3:13 PM EDTSevere Thunderstorm WarningBOXMiddlesex32 min
Jul 18, 3:18 PM EDTSevere Thunderstorm WarningBOXEssex17 min
Jul 18, 3:22 PM EDTSevere Thunderstorm WarningBOXSuffolk23 min
Jul 18, 3:31 PM EDTSevere Thunderstorm WarningBOXNorfolk44 min
Jul 18, 3:44 PM EDTSevere Thunderstorm WarningBOXSuffolk31 min
Jul 18, 4:00 PM EDTSevere Thunderstorm WarningBOXPlymouth30 min
Jul 18, 4:13 PM EDTSevere Thunderstorm WarningBOXNorfolk32 min
Jul 18, 4:39 PM EDTSevere Thunderstorm WarningBOXPlymouth21 min
Jul 18, 4:53 PM EDTSevere Thunderstorm WarningBOXWorcester27 min
Jul 18, 5:01 PM EDTSevere Thunderstorm WarningBOXPlymouth19 min
Jul 18, 5:32 PM EDTSevere Thunderstorm WarningBOXNorfolk28 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2000Every severe thunderstorm warning in 2000

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.