Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 48, NWS Boston/Norton, MA

July 1, 2001Essex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 1, 2001, 3:58 PM EDT for Essex County, Massachusetts. It was in force for 47 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 1, 2001, 3:58 PM EDT (19:58 UTC)
Expired: Jul 1, 2001, 4:45 PM EDT
In force: 47 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

County Essex County, MA

The radar

The Boston radar (KBOX), 79 km from the middle of the area, began a volume at 20:00 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
Jul 1, 4:22 PM EDT	Thunderstorm Wind 50 E	Rowley, MA
Jul 1, 4:48 PM EDT	Hail 1	Lawrence, 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 1, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 8.0 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-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: 156 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1403 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 94 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 011959
SVRBOX

MAC009-012045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
358 PM EDT SUN JUL 1 2001

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ESSEX COUNTY IN EASTERN MASSACHUSETTS
    INCLUDING NEWBURYPORT

* UNTIL 445 PM EDT.

* AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NEWBURY...OR ABOUT 7 MILES WEST OF
  NEWBURYPORT...MOVING EAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE WEST NEWBURY...
  SALISBURY...ROWLEY...MERRIMAC...HAVERHILL...GROVELAND...GEORGETOWN
  AND AMESBURY.

THUNDERSTORMS THIS AFTERNOON HAVE HAD A HISTORY OF PRODUCING DIME 
SIZE HAIL AND DAMAGING WINDS.

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

$$

NOTCHEY.
VALLEE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 9:00 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk	45 min
Jun 30, 9:30 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	30 min
Jul 1, 2:32 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	43 min
Jul 1, 3:24 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	66 min
Jul 1, 4:22 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	38 min
Jul 1, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	52 min
Jul 1, 4:57 PM EDT	Severe Thunderstorm Warning	BOX	Essex	48 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.