Alert archive / Massachusetts / Tornado Watches in 2015
Tornado Watch 345
The Storm Prediction Center issued this tornado watch at Jun 23, 2015, 3:47 PM EDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2015, 3:47 PM EDT (19:47 UTC)
- Expired
- Jun 23, 2015, 10:46 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 33 counties
Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Cumberland County, ME, Oxford County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 98 km from the middle of the area, began a volume at 19:50 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 4:21 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 39 min |
| Jun 23, 4:28 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 47 min |
| Jun 23, 4:57 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 40 min |
| Jun 23, 5:08 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Worcester | 52 min |
| Jun 23, 5:09 PM EDT | Severe Thunderstorm Warning | GYX | York | 51 min |
| Jun 23, 5:14 PM EDT | Severe Thunderstorm Warning | GYX | Coos | 46 min |
| Jun 23, 5:16 PM EDT | Tornado Warning | BOX | Bristol, Norfolk, Worcester | 44 min |
| Jun 23, 5:20 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 40 min |
| Jun 23, 5:25 PM EDT | Tornado Warning | GYX | Coos | 35 min |
| Jun 23, 5:30 PM EDT | Tornado Warning | GYX | Belknap, Carroll, Grafton | 30 min |
| Jun 23, 5:42 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 48 min |
| Jun 23, 5:46 PM EDT | Tornado Warning | BOX | Bristol, Norfolk, Plymouth | 30 min |
| Jun 23, 5:50 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Oxford | 40 min |
| Jun 23, 5:57 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Worcester | 48 min |
| Jun 23, 5:57 PM EDT | Severe Thunderstorm Warning | GYX | Coos | 48 min |
| Jun 23, 5:58 PM EDT | Severe Thunderstorm Warning | GYX | York | 47 min |
| Jun 23, 6:10 PM EDT | Tornado Warning | BOX | Plymouth | 30 min |
| Jun 23, 6:39 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Oxford | 51 min |
| Jun 23, 6:45 PM EDT | Severe Thunderstorm Warning | GYX | Cumberland, York | 45 min |
| Jun 23, 7:01 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 47 min |
| Jun 23, 7:19 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 41 min |
| Jun 23, 7:45 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 45 min |
| Jun 23, 8:13 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 47 min |
| Jun 23, 8:22 PM EDT | Severe Thunderstorm Warning | BOX | Washington | 32 min |
| Jun 23, 9:30 PM EDT | Severe Thunderstorm Warning | BOX | Barnstable | 39 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 7.8 hours before the alert went out and 165 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
- 17 J/kg
- Mixed-layer CIN
- -121 J/kg
- Mixed-layer LCL
- 952 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
153 WWUS20 KWNS 231945 SEL5 SPC WW 231945 CTZ000-MAZ000-MEZ000-NHZ000-RIZ000-CWZ000-240300- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 345 NWS STORM PREDICTION CENTER NORMAN OK 345 PM EDT TUE JUN 23 2015 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EASTERN CONNECTICUT MUCH OF MASSACHUSETTS FAR SOUTHERN MAINE CENTRAL AND SOUTHERN NEW HAMPSHIRE RHODE ISLAND COASTAL WATERS * EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 1100 PM EDT. * PRIMARY THREATS INCLUDE... A COUPLE TORNADOES POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE SUMMARY...THUNDERSTORMS CONTINUE TO INCREASE IN COVERAGE AND INTENSITY ACROSS EASTERN NEW YORK AND ADJACENT WESTERN NEW ENGLAND THIS AFTERNOON...AND SHOULD CONTINUE TO INCREASE AS THEY MOVE EASTWARD TOWARD THE ATLANTIC SEABOARD. DAMAGING WINDS AND SOME HAIL ARE EXPECTED...ALONG WITH POTENTIAL FOR A COUPLE OF TORNADOES. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF CONCORD NEW HAMPSHIRE TO 10 MILES WEST OF PROVIDENCE RHODE ISLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. && OTHER WATCH INFORMATION...CONTINUE...WW 341...WW 342...WW 343...WW 344... AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 27040. ...GOSS
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:57 AM EDT | Mesoscale Discussion | SPC | 63 min | |
| Jun 23, 10:12 AM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more | 6 hr |
| Jun 23, 2:46 PM EDT | Mesoscale Discussion | SPC | 89 min | |
| Jun 23, 3:35 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region | 6 hr |
| Jun 23, 4:53 PM EDT | Mesoscale Discussion | SPC | 97 min | |
| Jun 23, 6:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
Nearby
Tornado Watches in Massachusetts, 2015Tornado Watches in New Hampshire, 2015Tornado Watches in Rhode Island, 2015Every tornado watch in 2015
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.