Alert archive / Idaho / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 4, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at May 31, 1997, 2:50 PM PDT for Clearwater County, Idaho. It was in force for 40 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, 1997, 2:50 PM PDT (21:50 UTC)
- Expired
- May 31, 1997, 3:30 PM PDT
- In force
- 40 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Clearwater County, ID
The radar
The Missoula radar (KMSX), 133 km from the middle of the area, began a volume at 21:54 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, 12:45 PM PDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 9.8 hours before the alert went out and 127 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
- 11 J/kg
- Mixed-layer CIN
- -225 J/kg
- Mixed-layer LCL
- 1213 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 146 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 May 31, 1:16 PM PDT, 1 hour 34 minutes earlier.
Area forecast discussion, May 31, 1:16 PM PDT, 1 hour 34 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 145 PM MDT SAT MAY 31 1997 HYDRO ...FLOOD WARNINGS...BITTERROOT RIVER IN RAVALLI COUNTY..ROCK CREEK IN GRANITE AND MISSOULA COUNTY. ...FLOOD WATCH...YAAK RIVER IN LINCOLN COUNTY..SOUTH FORK OF THE FLATHEAD RIVER ABOVE THE HUNGRY HORSE DAM..AND CLARK FORK RIVER FROM MILLTOWN DAM THROUGH MISSOULA. MET. S/WV AND SURFACE FRONT MOVES ACROSS THE AREA THIS EVENING WITH SHOWERS AND THUNDERSTORMS...A FEW POSSIBLY SEVERE. A TORNADO WATCH IS IN EFFECT FOR IDAHO ZONES 5-8. WILL GO WITH LIKELY POPS MOST AREAS TONIGHT. MODELS INDICATING ATMS MORE STABLE AND DRIER SUNDAY..HOWEVER WITH WEAK S/WVS MOVING THRU THE SOUTHWEST FLOW WILL NOT RULE OUT SCATTERED SHOWERS SUNDAY AFTERNOON. WEAK S/WV MOVES ACROSS LEMHI COUNTY IDAHO AND SOUTHWEST MONTANA MONDAY MORNING HOWEVER A SLIGHT CHANCE LOOKS GOOD FOR THIS EVENT. COOLER NEXT COUPLE OF DAYS. TC ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 048/065 045/067 ... 296310 FCA EB 046/064 043/066 043 296310 POL .. 047/065 044/068 ... 296310 MSO EB 047/067 044/069 046 296311 HMM .. 048/070 046/071 ... 296312 BTM .. 044/064 040/066 ... 296212 S80 .. 052/067 048/069 ... 296311 P69 .. 051/069 050/072 ... 297410 SMN .. 047/073 045/075 ... 294100
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 1:37 PM PDT | Severe Thunderstorm Warning | MSO | Clearwater | 53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.