Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 72, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 1999, 2:03 PM EDT for Middlesex County, Massachusetts. It was in force for 42 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
- Aug 5, 1999, 2:03 PM EDT (18:03 UTC)
- Expired
- Aug 5, 1999, 2:45 PM EDT
- In force
- 42 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Whole counties
County Middlesex County, MA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 5, 2:18 PM EDT | Hail 0.75 | Waltham, MA | |
| Aug 5, 2:45 PM EDT | Thunderstorm Wind 50 | Watertown, 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, 6.1 hours before the alert went out and 148 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
- 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
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 4 hours 6 minutes earlier.
Area forecast discussion, Aug 5, 9:57 AM EDT, 4 hours 6 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.
DRAGThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 3:05 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 40 min |
| Aug 5, 3:33 PM EDT | Severe Thunderstorm Warning | BOX | Norfolk, Plymouth | 42 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 |
| Aug 5, 3:14 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 46 min |
| Aug 5, 3:17 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 43 min |
| Aug 5, 3:52 PM EDT | Severe Thunderstorm Warning | BOX | 38 min | |
| Aug 5, 4:15 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 45 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.