Alert archive / Idaho / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 20, NWS Boise, ID
NWS Boise, ID issued this severe thunderstorm warning at May 31, 1997, 2:45 PM MDT for Jerome County, Twin Falls County, Idaho. It was in force for 60 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 31, 1997, 2:45 PM MDT (20:45 UTC)
- Expired
- May 31, 1997, 3:45 PM MDT
- In force
- 60 min
- Issued by
- NWS Boise, ID
- Area
- Whole counties
Counties Jerome County, ID, Twin Falls County, ID
The radar
The Pocatello radar (KSFX), 159 km from the middle of the area, began a volume at 20:45 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 31, 3:35 PM MDT | Hail 0.75 | Kimberly, ID | A severe thunderstorm produced 3/4 inch hail in Twin Fallls County. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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, 2:30 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 8.8 hours before the alert went out and 183 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
- 347 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 2502 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Boise, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 10:51 AM MDT | Severe Thunderstorm Warning | BOI | Canyon, Owyhee | 69 min |
| May 31, 10:51 AM MDT | Severe Thunderstorm Warning | BOI | Gem | 69 min |
| May 31, 1:41 PM MDT | Severe Thunderstorm Warning | BOI | Elmore | 49 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 1997Every severe thunderstorm warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.