Alert archive / Idaho / Mesoscale Discussions in 2013
Mesoscale Discussion 1887
The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2013, 1:22 PM MDT for 16 counties in Idaho; 14 counties in Utah; 5 counties in Wyoming. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Sep 17, 2013, 1:22 PM MDT (19:22 UTC)
- Expired
- Sep 17, 2013, 2:45 PM MDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch likely
- Chance of a watch
- 80%
All 35 counties
Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Bonneville County, ID, Butte County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Franklin County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Power County, ID, Teton County, ID, Box Elder County, UT, Cache County, UT, Daggett County, UT, Davis County, UT, Duchesne County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Tooele County, UT, Uintah County, UT, Utah County, UT, Wasatch County, UT, Weber County, UT, Lincoln County, WY, Sublette County, WY, Sweetwater County, WY, Teton County, WY, Uinta County, WY
The radar
The Pocatello radar (KSFX), 123 km from the middle of the area, began a volume at 19:21 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 7.4 hours before the alert went out and 173 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
- 302 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 2232 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | Bannock, Bear Lake, Bingham, Bonneville, Butte, Caribou and 9 more | 8 hr |
| Sep 17, 3:44 PM MDT | Mesoscale Discussion | SPC | Bannock, Bear Lake, Bingham, Bonneville, Caribou, Franklin and 6 more | 91 min |
Nearby
Mesoscale Discussions in Idaho, 2013Mesoscale Discussions in Utah, 2013Mesoscale Discussions in Wyoming, 2013Every mesoscale discussion in 2013
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.