Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 38, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 23, 1999, 5:53 PM EDT for Plymouth County, Massachusetts. It was in force for 62 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 23, 1999, 5:53 PM EDT (21:53 UTC)
- Expired
- Jul 23, 1999, 6:55 PM EDT
- In force
- 62 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Whole counties
County Plymouth County, MA
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 9.9 hours before the alert went out and 73 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.
- Mixed-layer CAPE
- 57 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 1099 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KNYC 232154 RRA SVRBOS MAC023-232255- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAUNTON MA ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY 553 PM EDT FRI JUL 23 1999 THE NATIONAL WEATHER SERVICE IN NEW YORK HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PLYMOUTH IN EASTERN MASSACHUSSETTS * UNTIL 655 PM EDT * AT 550 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM EAST OF BRA"INTREE...MOVING EAST/SOUTHEAST AT 20 MPH. THIS STORM WILL BE NEAR DUXBURY AROUND 610 PM. THIS IS A DANGEROUS STORM! HAIL AND STRONG WINDS ARE POSSIBLE. STAY INDOORS AWAY FROM WINDOWS. PW/MW/PB
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 23, 3:15 PM EDT, 2 hours 38 minutes earlier.
Area forecast discussion, Jul 23, 3:15 PM EDT, 2 hours 38 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAUNTON MA 315 PM EDT FRI JUL 23 1999 DISC: LOOKS LIKE WE/RE IN FOR A RELATIVELY ACTIVE PERIOD DURING THE NEXT 72 HOURS. TSTMS UNEXPECTEDLY POPPED UP IN UNSTABLE AIRMASS DURING THE AFTERNOON...FIRST ON THE UPSLOPE RIDGES IN WRN ZONES... BUT HAVE SINCE POPPED UP IN VARIOUS PARTS OF FORECAST AREA. WILL CARRY TSMTS THROUGH THIS EVENING (EVEN THROUGH MIDNIGHT IN SOME ERN LOCATIONS). WEAK S/W NRG THAT MAY BE AIDING LIFT THROUGH FIRST PART OF THE NIGHT...WILL PASS OFF THE COAST BY MIDNIGHT FOLLOWED BY GOOD NVA/SUBSIDENCE. LINGERING LLVL MOISTURE AND HIGH TD/S WILL CREATE GOOD CONDITIONS FOR FOG AND THEN HAZE ON SAT. BEST ACTION LIKELY TO DEVELOP AS CFRONT AND PRE-FRONTAL TROF APPROACHES FROM THE WEST ON SAT. ANTICIPATE AN ORGANIZED LINE OF SHOWERS ASSOCIATED WITH TROF AND VERTICAL MOTION FIELD TO HEAD INTO THE WRN ZONES BY SAT AFTERNOON. CAPES WILL INCREASE 1000-1600 OR SO WITH LI/S APPROX -4...TT/S NEAR 50 AND INCREASING PW OF 1.5 TO 1.7. WIND FIELDS NOT TOO IMPRESSIVE...SO STORMS MAY BE REL SLOWER MOVING (20 TO 25 KTS) WITH HEAVY PCPN...GUSTY WINDS...FREQUENT LTG AND POSSIBLE HAIL (WBZ SIMILAR TO TODAY 10900 FT). TROF PASSES THROUGH DURING SAT...BUT CF LINGERS BEHIND AND FINALLY BEGINS TO MOVE INTO THE REGION ON SUN. HOWVER...AVN MODEL CLOSES OFF UPPER LOW AND DROP IT DOWN OVER SNE DURING THE DAY SUN. ALTHOUGH MID LEVEL TEMPS ARE NOT IMPRESSIVELY COLD...CLIMATOLOGICAL POSITION OF UPPER LOW AND CONTINUED SFC HEAT AND RESULTING INSTABILITY SPELLS INTERESTING WX FOR SOUTHERN NEW ENGLAND. THIS COULD BE FLASH FLOODING...FUNNELS...OR LOW TOP HAILERS. WILL EXAMINE POTENTIAL FOR THESE EVENTS AS SITUATION UNFOLDS. WENT NEAR GUID TEMPS...BUT STAYED A BIT BLO ON SUN. .BOX...NONE. DCY
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 3:30 PM EDT | Severe Thunderstorm Warning | BOX | Plymouth | 45 min |
| Jul 23, 5:13 PM EDT | Severe Thunderstorm Warning | BOX | Plymouth | 32 min |
| Jul 23, 5:30 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 50 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 1999Every 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.