Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 1, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 20, 1990, 6:15 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 60 min. 1 report 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 20, 1990, 6:15 PM EDT (22:15 UTC)
- Expired
- Jul 20, 1990, 7:15 PM EDT
- In force
- 60 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Whole counties
Counties Franklin County, MA, Worcester County, MA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 20, 6:40 PM EDT | Thunderstorm Wind 0 | Worcester, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Albany, NY (KALB), launched 12:00Z, 10.3 hours before the alert went out and 132 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
- 574 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KORH 202206 SVRORH MAC027-011-210415- BULLETIN-IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE WORCESTER MA 615 PM EDT FRI JUL 20 1990 EXPIRES 715 PM EDT THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 715 PM EDT FOR THE FOLLOWING COUNTIES IN MASSACHUSETTS...EASTERN FRANKLIN AND WORCESTER AT 6 PM EDT RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS IN CENTRAL FRANKLIN COUNTY MOVING TOWARD THE EAST AT ABOUT 40 MPH. THESE STORMS HAVE CAUSED WIND DAMAGE IN SHELBOURNE ALONG WITH HEAVY RAIN AND DANGEROUS LIGHTNING. IF THREATENING WEATHER APPROACHES GO TO A SAFE PLACE IMMEDIATELY AC
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 7:15 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 30 min |
| Jul 20, 7:45 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 30 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 1990Every severe thunderstorm warning in 1990
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.