Alert archive / Idaho / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 37, NWS Boise, ID
NWS Boise, ID issued this severe thunderstorm warning at May 31, 2018, 1:33 PM MDT for Owyhee County, Twin Falls County, Idaho. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 31, 2018, 1:33 PM MDT (19:33 UTC)
- Expired
- May 31, 2018, 2:00 PM MDT
- In force
- 27 min
- Issued by
- NWS Boise, ID
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Owyhee County, ID, Twin Falls County, ID
The radar
The Boise radar (KCBX), 132 km from the middle of the area, began a volume at 19:33 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 31, 1:10 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 7.6 hours before the alert went out and 138 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
- 15 J/kg
- Mixed-layer CIN
- -332 J/kg
- Mixed-layer LCL
- 1253 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at May 31, 9:18 AM MDT, 4 hours 15 minutes earlier.
Area forecast discussion, May 31, 9:18 AM MDT, 4 hours 15 minutes before
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Special weather statement, May 31, 12:27 PM MDT, 1 hour 6 minutes before
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</html>Local storm report, May 31, 1:21 PM MDT, 12 minutes before
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</html>The office that day
Everything else NWS Boise, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 6:00 PM MDT | Severe Thunderstorm Warning | BOI | Jerome, Twin Falls | 30 min |
| May 30, 6:32 PM MDT | Special Weather Statement | BOI | Jerome | 28 min |
| May 30, 6:59 PM MDT | Special Weather Statement | BOI | Canyon | 31 min |
| May 30, 7:28 PM MDT | Special Weather Statement | BOI | Ada | 32 min |
| May 30, 8:01 PM MDT | Special Weather Statement | BOI | Boise | 29 min |
| May 31, 12:27 PM MDT | Special Weather Statement | BOI | Gooding, Jerome, Twin Falls | 63 min |
| May 31, 12:49 PM MDT | Severe Thunderstorm Warning | BOI | Twin Falls | 41 min |
| May 31, 1:27 PM MDT | Severe Thunderstorm Warning | BOI | Jerome, Twin Falls | 38 min |
| May 31, 1:58 PM MDT | Special Weather Statement | BOI | Twin Falls | 32 min |
| May 31, 2:32 PM MDT | Special Weather Statement | BOI | Twin Falls | 28 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 2018Every severe thunderstorm warning 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.