Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 1, NWS Boston/Norton, MA

May 12, 2001Essex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 12, 2001, 5:43 PM EDT for Essex County, Massachusetts. It was in force for 62 min. 1 report 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
May 12, 2001, 5:43 PM EDT (21:43 UTC)
Expired
May 12, 2001, 6:45 PM EDT
In force
62 min
Issued by
NWS Boston/Norton, MA
Area
Whole counties

County Essex County, MA

What was reported inside it

TimeReportWhereRemark
May 12, 5:50 PM EDTThunderstorm Wind 50 ELynnfield, 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, 9.7 hours before the alert went out and 131 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 2001-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2001-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2141 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
32 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.

746 
WUUS51 KBOX 122144
SVRBOX
MAC009-122245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
543 PM EDT SAT MAY 12 2001

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ESSEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING BEVERLY...LYNN

* UNTIL 645 PM EDT.

* AT 537 PM EDT...SKYWARN SPOTTERS REPORTED A SEVERE THUNDERSTORM 13
  MILES SOUTHWEST OF LYNNFIELD...OR ABOUT 3 MILES NORTH OF WALTHAM...
  MOVING NORTHEAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE WENHAM...TOPSFIELD...
  SWAMPSCOTT...SALEM...ROWLEY...PEABODY...MIDDLETON...MARBLEHEAD...
  MANCHESTER...IPSWICH...HAMILTON...ESSEX AND DANVERS.

SEVERE THUNDERSTORMS PRODUCE WINDS STRONG ENOUGH TO KNOCK DOWN TREES
AND POWER LINES. MOVE INDOORS AND STAY AWAY FROM WINDOWS.
$$

WTB/THF

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2001Every 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.