Alert archive / North Dakota / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 159
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 2014, 5:12 PM MDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 2014, 5:12 PM MDT (23:12 UTC)
- Expired
- May 19, 2014, 12:00 AM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 65 kt
All 30 counties
Carter County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Richland County, MT, Roosevelt County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Burke County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger County, ND, McKenzie County, ND, Mountrail County, ND, Slope County, ND, Stark County, ND, Williams County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 200 km from the middle of the area, began a volume at 23:15 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
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 |
|---|---|---|---|---|
| May 18, 5:18 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 57 min |
| May 18, 5:20 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 55 min |
| May 18, 6:13 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 62 min |
| May 18, 6:14 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| May 18, 7:00 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River, Rosebud, Treasure | 60 min |
| May 18, 7:35 PM MDT | Flash Flood Warning | BYZ | Powder River, Rosebud | 3 hr |
| May 18, 7:52 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Powder River, Rosebud | 53 min |
| May 18, 8:40 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Custer, Fallon, Powder River | 65 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
Rapid City, SD (KRAP), launched 12:00Z, 11.2 hours before the alert went out and 204 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
- 1235 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 75 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 |
|---|---|---|---|---|
| May 18, 12:37 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Big Horn, Broadwater, Carbon, Carter, Custer and 28 more | 83 min |
| May 18, 2:13 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carbon, Custer, Fergus, Garfield, Golden Valley and 13 more | 7 hr |
| May 18, 4:57 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Carter, Custer, Daniels, Dawson and 21 more | 63 min |
Nearby
Severe Thunderstorm Watches in North Dakota, 2014Severe Thunderstorm Watches in South Dakota, 2014Severe Thunderstorm Watches in Montana, 2014Every severe thunderstorm watch in 2014
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.