Alert archive / Massachusetts / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 458
The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2007, 4:42 PM EDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2007, 4:42 PM EDT (20:42 UTC)
- Expired
- Jun 27, 2007, 8:53 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Cheshire County, NH, Hillsborough County, NH, Kent County, RI, Providence County, RI
The radar
The Boston radar (KBOX), 89 km from the middle of the area, began a volume at 20:43 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 4:59 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 31 min |
| Jun 27, 5:30 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex | 15 min |
| Jun 27, 6:12 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 33 min |
| Jun 27, 6:16 PM EDT | Severe Thunderstorm Warning | BOX | Hampshire | 14 min |
| Jun 27, 6:22 PM EDT | Severe Thunderstorm Warning | BOX | Franklin | 14 min |
| Jun 27, 7:04 PM EDT | Severe Thunderstorm Warning | BOX | Cheshire | 11 min |
| Jun 27, 7:05 PM EDT | Severe Thunderstorm Warning | BOX | Cheshire, Hillsborough | 25 min |
| Jun 27, 7:14 PM EDT | Severe Thunderstorm Warning | BOX | Cheshire | 16 min |
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 8.7 hours before the alert went out and 156 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
- 1637 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 997 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region, Naugatuck Valley Planning Region | 7 hr |
| Jun 27, 7:26 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region, Naugatuck Valley Planning Region | 4 hr |
| Jun 27, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | Belknap, Carroll, Coos, Grafton, Merrimack, Rockingham and 2 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Massachusetts, 2007Severe Thunderstorm Watches in Connecticut, 2007Severe Thunderstorm Watches in New Hampshire, 2007Every severe thunderstorm watch in 2007
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.