Alert archive / Idaho / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 5, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jun 24, 1999, 5:34 PM PDT for Idaho County, Idaho. It was in force for 41 min. 2 reports 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
- Jun 24, 1999, 5:34 PM PDT (00:34 UTC)
- Expired
- Jun 24, 1999, 6:15 PM PDT
- In force
- 41 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Idaho County, ID
The radar
The Missoula radar (KMSX), 175 km from the middle of the area, began a volume at 00:38 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 |
|---|---|---|---|
| Jun 24, 5:53 PM PDT | Hail 1.5 | (S80)Grangeville Arp, ID | |
| Jun 24, 5:53 PM PDT | Thunderstorm Wind 54 | (S80)Grangeville Arp, ID |
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 nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.6 hours before the alert went out and 218 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
- 9 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1934 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 24, 1:30 PM PDT, 4 hours 4 minutes earlier.
Area forecast discussion, Jun 24, 1:30 PM PDT, 4 hours 4 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 230 PM MDT THU JUN 24 1999 LATEST SATELLITE AND 88D LOOPS SHOWING AN AREA OF CONVECTION DEVELOPING OVER IDAHO ZONES 5 AND 6 AS WELL AS EASTERN OREGON/WASHINGTON. MODELS IN GOOD AGREEMENT WITH THUNDERSTORM EVENT THIS AFTERNOON AND EVENING ACROSS MUCH OF CWA. BEST POTENTIAL FOR STRONG TO SEVERE STORMS APPEARS TO BE OVER EASTERN WASHINGTON/OREGON AND NORTHERN IDAHO EARLY AND POSSIBLY LATER IN NORTHWEST MONTANA AND CENTRAL IDAHO. LI OF -3 TO -4...CAPE NEAR 1000 J/KG AND LOW LEVEL SHEAR MAY SUPPORT STRONG STORMS AND ISOLATED SEVERE STORMS IN THOSE AREAS LATE THIS AFTERNOON AND EVENING. A COOL SHOWER REGIME CONTINUES FOR FRIDAY AND SATURDAY AS MAIN UPPER TROUGH REMAINS OVER CWA. SO WILL GO WITH COOLER TEMPERATURES AND LOW POPS. MATHEWSON EXTENDED...MRF/UK SIMILAR SOLUTIONS AND PREFERRED. UPPER TROF EXITING SUNDAY MORNING WITH AMPLIFYING RIDGING MAINTAINING DRYING OVER WESTERN MONTANA THROUGH DAY 4. ON DAY 5..NEXT S/W OVER NORTHWEST PROVIDING WARMING TEMPS AND A SLIGHT CHANCE OF MOUNTAIN SHOWERS NORTH. STOLL
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 5:30 PM PDT | Severe Thunderstorm Warning | MSO | Flathead, Lake | 45 min |
| Jun 24, 6:15 PM PDT | Severe Thunderstorm Warning | MSO | Flathead | 45 min |
| Jun 24, 6:50 PM PDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 40 min |
| Jun 24, 7:23 PM PDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 52 min |
| Jun 24, 7:23 PM PDT | Severe Thunderstorm Warning | MSO | Ravalli | 52 min |
| Jun 24, 8:17 PM PDT | Severe Thunderstorm Warning | MSO | Missoula, Powell | 28 min |
| Jun 24, 6:16 PM PDT | Severe Thunderstorm Warning | MSO | Idaho | 44 min |
| Jun 24, 6:50 PM PDT | Severe Thunderstorm Warning | MSO | Idaho | 40 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 1999Every severe thunderstorm warning in 1999
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.