Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 76, NWS Boston/Norton, MA

August 5, 1999Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 1999, 3:33 PM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 5, 1999, 3:33 PM EDT (19:33 UTC)
Expired: Aug 5, 1999, 4:15 PM EDT
In force: 42 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

Counties Norfolk County, MA, Plymouth County, MA

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 7.6 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 30 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 
TTAA00 KBOX 051935 RRA
SVRBOS
MAC021-023-052015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
333 PM EDT THU AUG 5 1999

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH PLYMOUTH COUNTY AND EASTERN NORFOLK COUNTY
  IN SOUTHEAST MASSACHUSETTS

* UNTIL 415 PM EDT.

* AT 331 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
A   SEVERE THUNDERSTORM NEAR WEYMOUTH MOVING EAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE SCITUATE...COHASSET AND
  NORWELL.

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

$$
AN/RMT

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 5, 9:57 AM EDT, 5 hours 36 minutes earlier.

Area forecast discussion, Aug 5, 9:57 AM EDT, 5 hours 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
957 AM EDT THU AUG 5 1999

RADAR EXPECTED RTS ARD 1130 AM.

SVR: PER 1210Z SPC AND GRAPHICS..ISO SVR POSS. 12Z APPEARS A LITTLE
     WETTER THAN MODELED BY 00Z ETA AND 00Z ETA FCST WAS QUITE
     UNSTABLE THIS AFTN WITH TT NR 54 AND PLENTY OF INSTABILITY WITH
     PLENTY OF WIND ALOFT.  WHILE DRY AIR MAY MITIGATE SVR THREAT
     AM STILL CONCERNED FOR WIND DAMAGE.  BLV WE REACH MAX OF 85-87F
     THIS AFTN WITH SFC TDS IN MID 60S WITH THREAT OF TSTMS
     STARTING WEST MASS EARLY AFTN AND REACHING COAST IN DYING OUT
     PHASE ARD 00Z.

     CONVECTIVE TEMP IS NR 82F.  TROP AND EL ARD 34-35K WITH MPL
     43K...WBZ ARD 10K WITH PW ABT 1.3 AND STM INFLOW ARD 25KT.

     COORD ALY ON WORDING OF ANY THREAT.  NO SPS.

.BOX...NONE.

DRAG

In the hours before

Local storm report, Aug 5, 2:04 PM EDT, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
204 PM EDT THU AUG 05 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0200 PM    SUDBURY                   MA   .75 INCH HAIL
08/05/99   MIDDLESEX                      DIME TO NICKEL SIZED HAIL
                                          REPORTED BY FIRE DEPT
                                          SUDBURY FLATS

Local storm report, Aug 5, 3:31 PM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
331 PM EDT THU AUG 05 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0308 PM    GARDNER                   MA   1 INCH HAIL
08/05/99   WORCESTER                      REPORTED BY SPOTTER

0325 PM    FARMINGTON                CT   WIND DAMAGE
08/05/99   HARTFORD                       TREES LIMBS DOWN AROUND
                                          320 PM FARMINGTON

0328 PM    UNIONVILLE                CT   1 INCH HAIL
08/05/99   HARTFORD                       REPORTED BY SPOTTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 2:03 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	42 min
Aug 5, 3:05 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	40 min
Aug 5, 3:39 PM EDT	Severe Thunderstorm Warning	BOX	Essex	51 min
Aug 5, 3:56 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	49 min
Aug 5, 4:19 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk	41 min
Aug 5, 5:14 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	46 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 1999 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive.