Alert archive / Idaho / Mesoscale Discussions in 2020
Mesoscale Discussion 507
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2020, 2:58 PM MDT for 26 counties in Idaho; Malheur County, Oregon; Box Elder County, Cache County, Utah. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2020, 2:58 PM MDT (20:58 UTC)
- Expired
- Apr 30, 2020, 4:30 PM MDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 29 counties
Ada County, ID, Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Blaine County, ID, Boise County, ID, Bonneville County, ID, Butte County, ID, Camas County, ID, Canyon County, ID, Caribou County, ID, Cassia County, ID, Custer County, ID, Elmore County, ID, Franklin County, ID, Gem County, ID, Gooding County, ID, Jefferson County, ID, Jerome County, ID, Lincoln County, ID, Minidoka County, ID, Oneida County, ID, Owyhee County, ID, Payette County, ID, Power County, ID, Twin Falls County, ID, Malheur County, OR, Box Elder County, UT, Cache County, UT
The radar
The Pocatello radar (KSFX), 131 km from the middle of the area, began a volume at 21:01 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 nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 9.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1842 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -72 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 11:36 AM MDT | Mesoscale Discussion | SPC | Ada, Boise, Camas, Canyon, Custer, Elmore and 8 more | 84 min |
Nearby
Mesoscale Discussions in Idaho, 2020Mesoscale Discussions in Utah, 2020Mesoscale Discussions in Oregon, 2020Every mesoscale discussion in 2020
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.