Alert archive / Connecticut / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 23, NWS Boston/Norton, MA

July 18, 1999Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 1999, 5:59 PM EDT for Northeastern Connecticut Planning Region, Connecticut. It was in force for 46 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: Jul 18, 1999, 5:59 PM EDT (21:59 UTC)
Expired: Jul 18, 1999, 6:45 PM EDT
In force: 46 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

County Northeastern Connecticut Planning Region, CT

The radar

The Boston radar (KBOX), 71 km from the middle of the area, began a volume at 22:02 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.0 hours before the alert went out and 130 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: 119 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1872 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 13 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 182201 RRA
SVRBOS
CTC013-015-182245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
559 PM EDT SUN JUL 18 1999

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT
  SOUTHERN WINDHAM COUNTY IN NORTHERN CONNECTICUT
    INCLUDING PLAINFIELD...WILLIMANTIC

* UNTIL 645 PM EDT.

* AT 557 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES WEST OF WILLIMANTIC...MOVING EAST AT 30
  MPH.

* OTHER LOCATIONS IN THE WARNING AREA INCLUDE WINDHAM...SCOTLAND...
  HAMPTON...DANIELSON...CANTERBURY AND BROOKLYN.

$$
RMT/GF

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 Jul 18, 3:20 PM EDT, 2 hours 39 minutes earlier.

Area forecast discussion, Jul 18, 3:20 PM EDT, 2 hours 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
320 PM EDT SUN JUL 18 1999

CDFNT CONTG TO MOV FAIRLY SLOLY SWD TWD SNE.  ENUF LIFT INADN OF
THIS COMBINED WITH SML CAPE AND LIS -2 TO -4 TO PRODUCE TSTMS JUST
NW OF THE FCST AREA.  THESE ARE EXPCD TO CONT MOVG AND DVLPG SWD OVR
THE NWRN PART OF THE FA DURG THE NEXT FEW HRS.  SML CHC OF SVR TSTM.
SFC DEW PTS FALLING SLTLY WRN MA AND NRN CT, BRBL DUE TO VERTICAL
MIXING BUT WITH TEMPS NR 100F PLENTY OF POTENTIAL ENERGY AT SFC.

AVN AND ETA STALL FNTL TROF OUT ACRS SNE.  FM THIS IT APPRS CHC FOR
SHWRS AND PSBL TSTMS WL CONT THRU MON NGT.  MODELS ARE SLO TO COOL
TEMPS MUCH AT 850 MB DURG THIS PD.  BUT WITH CLDS AND PSBL SHWRS SFC
TEMPS WL BE COOLER.  ETA SHOWS STG OMEGA MAX WITH THIS MON AND MON
NGT GENERATING SOME FAIRLY SGFNT QPF ACRS THE FCST AREA BUT SUSPECT
THAT THIS MAY BE A LTL OVER DONE.

CAN HI FINALLY MOVS IN TUE INCRG NLY FLO WITH PRBL ONSHR WND ALG CST
E SIDE AND LWRG TEMPS.

.BOX...NONE.

DMH

In the hours before

Local storm report, Jul 18, 5:32 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
532 PM EDT SUN JUL 18 1999

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

0450 PM    BERNARDSTON               MA   WIND DAMAGE
07/18/99   FRANKLIN                       TREES DOWN PER POLICE DEPT

0510 PM    BLOOMFIELD                CT   WIND DAMAGE
07/18/99   HARTFORD                       TREES DOWN PER FIRE DEPT

...CORRECTED TIME OF BLOOMFIELD CT EVENT...

Local storm report, Jul 18, 5:32 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
532 PM EDT SUN JUL 18 1999

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

0450 PM    BERNARDSTON               MA   WIND DAMAGE
07/18/99   FRANKLIN                       TREES DOWN PER POLICE DEPT

0531 PM    BLOOMFIELD                CT   WIND DAMAGE
07/18/99   HARTFORD                       TREES DOWN PER FIRE DEPT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:49 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	26 min
Jul 18, 7:00 PM EDT	Severe Thunderstorm Warning	BOX		45 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 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; radar from the NEXRAD Level II archive.