Alert archive / Vermont / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 360
The Storm Prediction Center issued this severe thunderstorm watch at Aug 29, 2018, 3:45 PM EDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2018, 3:45 PM EDT (19:45 UTC)
- Expired
- Aug 29, 2018, 8:29 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 21 counties
Franklin County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Somerset County, ME, Carroll County, NH, Coos County, NH, Grafton County, NH, Essex County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 117 km from the middle of the area, began a volume at 19:47 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
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 3:57 PM EDT | Tornado Warning | CAR | Piscataquis, Somerset | 33 min |
| Aug 29, 4:13 PM EDT | Severe Thunderstorm Warning | GYX | Somerset | 48 min |
| Aug 29, 4:27 PM EDT | Tornado Warning | CAR | Piscataquis | 33 min |
| Aug 29, 4:36 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Somerset | 54 min |
| Aug 29, 4:57 PM EDT | Tornado Warning | CAR | Penobscot, Piscataquis | 63 min |
| Aug 29, 5:14 PM EDT | Severe Thunderstorm Warning | BTV | Caledonia, Essex, Orleans | 61 min |
| Aug 29, 5:15 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 60 min |
| Aug 29, 5:44 PM EDT | Severe Thunderstorm Warning | CAR | Aroostook, Penobscot, Piscataquis | 61 min |
| Aug 29, 5:49 PM EDT | Severe Thunderstorm Warning | CAR | Penobscot, Piscataquis | 41 min |
| Aug 29, 6:30 PM EDT | Severe Thunderstorm Warning | CAR | Penobscot, Piscataquis | 30 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 155 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
- 3 J/kg
- Mixed-layer CIN
- -263 J/kg
- Mixed-layer LCL
- 1325 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 4 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 |
|---|---|---|---|---|
| Aug 29, 2:56 PM EDT | Mesoscale Discussion | SPC | Aroostook, Franklin, Oxford, Piscataquis, Somerset | 2 hr |
| Aug 29, 6:16 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Franklin, Kennebec, Oxford, Penobscot, Piscataquis and 2 more | 89 min |
| Aug 29, 6:16 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Franklin, Kennebec, Oxford, Penobscot, Piscataquis and 2 more | 89 min |
| Aug 29, 1:19 PM EDT | Mesoscale Discussion | SPC | Clinton, Essex, Franklin, Hamilton, Herkimer, Jefferson and 2 more | 116 min |
Nearby
Severe Thunderstorm Watches in Vermont, 2018Severe Thunderstorm Watches in Maine, 2018Severe Thunderstorm Watches in New Hampshire, 2018Every severe thunderstorm watch in 2018
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.