Alert archive / Idaho / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 614
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2007, 4:08 PM MDT for 9 counties in Idaho; Box Elder County, Cache County, Rich County, Utah; 6 counties in Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2007, 4:08 PM MDT (22:08 UTC)
- Expired
- Aug 18, 2007, 11:01 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Bonneville County, ID, Caribou County, ID, Franklin County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Box Elder County, UT, Cache County, UT, Rich County, UT, Fremont County, WY, Hot Springs County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY
The radar
The Riverton/Lander radar (KRIW), 172 km from the middle of the area, began a volume at 22:08 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
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- 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
- 60%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:09 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Caribou | 51 min |
| Aug 18, 4:11 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 64 min |
| Aug 18, 4:21 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Teton | 25 min |
| Aug 18, 4:30 PM MDT | Flash Flood Warning | RIW | Teton | 4 hr |
| Aug 18, 4:47 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 28 min |
| Aug 18, 5:02 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bear Lake, Caribou, Franklin, Oneida | 28 min |
| Aug 18, 5:10 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville | 35 min |
| Aug 18, 5:13 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 47 min |
| Aug 18, 5:28 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake, Caribou, Franklin | 19 min |
| Aug 18, 9:50 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Davis, Weber | 25 min |
| Aug 18, 10:14 PM MDT | Severe Thunderstorm Warning | SLC | Cache, Weber | 16 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
Riverton, WY (KRIW), launched 12:00Z, 10.1 hours before the alert went out and 178 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
- 1841 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 66 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 18, 1:50 PM MDT | Mesoscale Discussion | SPC | Bear Lake, Bingham, Bonneville, Caribou, Clark, Fremont and 3 more | 115 min |
| Aug 18, 2:50 PM MDT | Mesoscale Discussion | SPC | Box Elder, Cache, Davis, Juab, Morgan, Rich and 6 more | 115 min |
Nearby
Severe Thunderstorm Watches in Idaho, 2007Severe Thunderstorm Watches in Wyoming, 2007Severe Thunderstorm Watches in Utah, 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.