Alert archive / Vermont / Tornado Watches in 2018
Tornado Watch 76
The Storm Prediction Center issued this tornado watch at May 4, 2018, 3:16 PM EDT for 11 counties in New York; 12 counties in Vermont. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 4, 2018, 3:16 PM EDT (19:16 UTC)
- Expired
- May 4, 2018, 9:28 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 70 kt
All 23 counties
Clinton County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Oneida County, NY, Saratoga County, NY, St. Lawrence County, NY, Warren County, NY, Washington 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), 70 km from the middle of the area, began a volume at 19:16 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
- 90%
- One or more gusts of 65 knots or more
- 70%
- 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
- 95%
Warnings issued inside it
28 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 4:08 PM EDT | Severe Thunderstorm Warning | BTV | St. Lawrence | 67 min |
| May 4, 4:28 PM EDT | Severe Thunderstorm Warning | BTV | St. Lawrence | 62 min |
| May 4, 4:49 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Franklin, St. Lawrence | 56 min |
| May 4, 5:07 PM EDT | Severe Thunderstorm Warning | ALY | Hamilton, Herkimer | 23 min |
| May 4, 5:26 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Essex, Franklin, St. Lawrence | 64 min |
| May 4, 5:31 PM EDT | Severe Thunderstorm Warning | ALY | Hamilton | 29 min |
| May 4, 5:41 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Franklin | 64 min |
| May 4, 5:49 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Cayuga, Chenango, Cortland, Madison, Oneida and 5 more | 41 min |
| May 4, 5:57 PM EDT | Severe Thunderstorm Warning | BGM | Madison, Oneida, Onondaga | 48 min |
| May 4, 6:17 PM EDT | Severe Thunderstorm Warning | BTV | Franklin, St. Lawrence | 42 min |
| May 4, 6:22 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Hamilton, Herkimer | 53 min |
| May 4, 6:24 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Essex | 66 min |
| May 4, 6:27 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Cortland, Madison, Oneida, Otsego and 2 more | 63 min |
| May 4, 6:37 PM EDT | Severe Thunderstorm Warning | BGM | Oneida | 23 min |
| May 4, 6:51 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Essex, Franklin, St. Lawrence | 44 min |
| May 4, 6:54 PM EDT | Severe Thunderstorm Warning | BTV | Essex, Franklin, Orleans | 45 min |
| May 4, 7:12 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Hamilton, Herkimer, Montgomery, Saratoga, Warren | 48 min |
| May 4, 7:12 PM EDT | Severe Thunderstorm Warning | BTV | Caledonia, Chittenden, Franklin, Lamoille, Orleans, Washington | 63 min |
| May 4, 7:29 PM EDT | Severe Thunderstorm Warning | BTV | Essex | 61 min |
| May 4, 7:41 PM EDT | Severe Thunderstorm Warning | BTV | Essex | 51 min |
| May 4, 7:42 PM EDT | Flash Flood Warning | BTV | Chittenden, Lamoille, Washington | 3 hr |
| May 4, 7:50 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Montgomery, Saratoga, Schenectady, Warren, Washington | 40 min |
| May 4, 8:00 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Montgomery, Rensselaer, Saratoga, Schenectady, Schoharie and 1 more | 60 min |
| May 4, 8:05 PM EDT | Severe Thunderstorm Warning | BTV | Caledonia, Essex, Orleans, Washington | 55 min |
| May 4, 8:25 PM EDT | Severe Thunderstorm Warning | BTV | Addison, Caledonia, Chittenden, Orange, Rutland, Washington and 1 more | 65 min |
| May 4, 8:28 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer, Washington | 62 min |
| May 4, 8:29 PM EDT | Flash Flood Warning | BTV | Caledonia, Lamoille, Orleans, Washington | 3 hr |
| May 4, 8:36 PM EDT | Severe Thunderstorm Warning | BTV | Rutland, Windsor | 54 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
Albany, NY (KALY), launched 12:00Z, 7.3 hours before the alert went out and 171 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 812 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
548
WWUS20 KWNS 041913
SEL6
SPC WW 041913
NYZ000-VTZ000-050200-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 76
NWS Storm Prediction Center Norman OK
315 PM EDT Fri May 4 2018
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northeast New York
Much of Vermont
* Effective this Friday afternoon and evening from 315 PM until
1000 PM EDT.
* Primary threats include...
A couple tornadoes possible
Widespread damaging winds and isolated significant gusts to 80
mph likely
Isolated large hail events to 1 inch in diameter possible
SUMMARY...Isolated afternoon thunderstorms may pose a risk of
isolated tornadoes and a damaging wind gusts. Later this afternoon
and evening, the potential for widespread damaging winds will also
increase as storms approach from the west.
The tornado watch area is approximately along and 65 statute miles
north and south of a line from 55 miles north of Utica NY to 35
miles east of Montpelier VT. For a complete depiction of the watch
see the associated watch outline update (WOUS64 KWNS WOU6).
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 74...WW 75...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 400. Mean
storm motion vector 24040.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 2:18 PM EDT | Mesoscale Discussion | SPC | Belknap, Carroll, Cheshire, Coos, Grafton, Merrimack and 1 more | 87 min |
| May 4, 5:52 PM EDT | Mesoscale Discussion | SPC | Cheshire, Hillsborough | 83 min |
| May 4, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | Belknap, Cheshire, Coos, Grafton, Hillsborough, Merrimack and 1 more | 4 hr |
| May 4, 6:48 PM EDT | Mesoscale Discussion | SPC | Coos, Grafton | 117 min |
| May 4, 7:54 PM EDT | Mesoscale Discussion | SPC | Belknap, Carroll, Coos, Grafton, Strafford | 3 hr |
| May 4, 1:04 PM EDT | Mesoscale Discussion | SPC | Cattaraugus, Chautauqua, Erie, Genesee, Livingston, Monroe and 1 more | 86 min |
| May 4, 2:23 PM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Chemung, Cortland, Erie and 17 more | 97 min |
| May 4, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 23 more | 6 hr |
| May 4, 4:20 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 21 more | 55 min |
Nearby
Tornado Watches in Vermont, 2018Tornado Watches in New York, 2018Every tornado 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.