Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 12, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 30, 1986, 12:30 AM EDT for Dukes County, Massachusetts. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jul 30, 1986, 12:30 AM EDT (04:30 UTC)
- Expired
- Jul 30, 1986, 1:00 AM EDT
- In force
- 30 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Whole counties
County Dukes County, MA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Chatham, MA (KCHH), launched 00:00Z, 4.5 hours before the alert went out and 68 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
- 373 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 552 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KBOS 300345 SVRBOS MAC007-019-300500- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BOSTON MA 1130 PM EDT TUE JUL 29 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 100 AM EDT WED FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHEAST MASSACHUSETTS...DUKES...NANTUCKET AT 1130 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A CLUSTER OF HEAVY THUNDERSTORMS OVER VINEYARD SOUND APPROACHING MARTHAS VINEYARD ISLAND. MOVEMENT WAS EAST AT 15 MPH. THESE STORMS ARE ACCOMPANIED BY WIND GUSTS TO 50 MPH..TORRENTIAL DOWNPOURS..AND POSSIBLE HAIL. IF YOU ARE IN THE PATH OF THESE STORMS MOVE TO A SAFE SHELTER QUICKLY. ASK THE NEARE ST LAW ENFORCEMENT AGENCY TO RELAY ANY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE. AUCIELLO
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.
In the hours before
Special weather statement, Jul 29, 8:15 PM EDT, 4 hours 15 minutes before
NATIONAL WEATHER SERVICE BOSTON MA 815 PM EDT TUE JUL 29 1986 THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR WESTERN MASSACHUSETTS HAS EXPIRED AT 800 PM EDT. AT 800 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS EXTENDING FROM JUST WEST OF LOWELL TO SOUTH OF WORCESTER. MOVEMENT WAS EAST AT 10 MPH. ALTHOUGH THE THUNDERSTORMS HAVE DECREASED IN INTENSITY..THESE STORMS STILL HAVE THE POTENTIAL TO PRODUCE HEAVY DOWNPOURS AND STRONG GUSTY WINDS. THIS WILL BE THE LAST STATEMENT ISSUED ON THIS WEATHER SITUATION. AUCIELLO
Special weather statement, Jul 29, 9:39 PM EDT, 2 hours 51 minutes before
^BOSSPSPVD SPECIAL WEATHER STATEMENT FOR RHODE ISLAND NATIONAL WEATHER SERVICE PROVIDENCE RI 935 PM EDT TUE JUL 29 1986 ...THUNDERSTORMS ARE SLOWLY MOVING THROUGH COASTAL RHODE ISLAND... AT 930 PM CHATHAM WEATHER RADAR INDICATED VERY HEAVY THUNDERSTORMS WERE SLOWLY MOVING INTO THE WESTERLY AREA AND DEVELOPING TO THE EAST. SOME OF THESE STORMS COULD CONTAIN HEAVY DOWNPOURS..STRONG GUSTY WINDS DANGEROUS LIGHTNING AND SMALL HAIL. BECAUSE THESE STORMS ARE SLOW MOVING..LOCAL STREET AND URBAN FLOODING COULD RESULT ACROSS SOUTHERN AND CENTRAL WASHINGTON COUNTY. THE STORMS WILL TEND TO WEAKEN AS THEY MOVE EASTWARD OVER THE NEXT FEW HOURS. RESIDENTS ACROSS COASTAL RHODE ISLAND SHOULD TAKE COVER IF ANY OF THESE STORMS THREATEN. VALLIER
Special weather statement, Jul 29, 11:23 PM EDT, 1 hour 7 minutes before
^BOSSPSPVD SPECIAL WEATHER STATEMENT FOR RHODE ISLAND NATIONAL WEATHER SERVICE PROVIDENCE RI 1120 PM EDT TUE JUL 29 1986 ....VERY HEAVY THUNDERSTORMS NOW ENTERING NEWPORT COUNTY ... THE LINE OF VERY HEAVY THUNDERSTORMS THAT WAS IN SOUTH COUNTY RI EARLIER THIS EVENING IS NOW OVER THE SOUTHERN HALF OF NARRAGANSETT BAY. THE AREA WILL CONTINUE TO MOVE ACROSS NEWPORT COUNTY DURING THE NEXT HOUR OR SO. THESE THUNDERSTORMS CONTAIN FREQUENT LIGHTNING..STRONG GUSTY WINDS..VERY HEAVY DOWNPOURS WITH STREET FLOODING AND SOME HAIL. REPORTS FROM POLICE IN SOUTH COUNTY INDICATED STREET AND URBAN FLOODING FROM THESE STORMS. PEOPLE IN NEWPORT COUNTY SHOULD BE ON THE LOOKOUT FOR THESE THUNDERSTORMS AN SEEK SHELTER AS THEY APPROACH. MOTORIST ARE REMINDED NOT TO DRIVE THROUGH DEEP PUDDLES AND TO PULL OFF TO THE SIDE OF THE ROAD IF VISIBILITY IS SEVERELY RESTRICTED. VALLIER
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 12:30 AM EDT | Severe Thunderstorm Warning | BOX | Nantucket | 30 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 1986Every severe thunderstorm warning in 1986
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.