Alert archive / Washington / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 21, NWS Spokane, WA
NWS Spokane, WA issued this severe thunderstorm warning at Jun 17, 1997, 6:57 PM PDT for Stevens County, Washington. It was in force for 48 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
- Jun 17, 1997, 6:57 PM PDT (01:57 UTC)
- Expired
- Jun 17, 1997, 7:45 PM PDT
- In force
- 48 min
- Issued by
- NWS Spokane, WA
- Area
- Whole counties
County Stevens County, WA
The radar
The Spokane radar (KOTX), 82 km from the middle of the area, began a volume at 02:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 17, 7:30 PM PDT | Hail 1 | Colville, WA | 1 inch hail |
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, 2.0 hours before the alert went out and 133 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
- 184 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1405 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KGEG 180158 RRA SVRGEG WAC065-180245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPOKANE WA 657 PM PDT TUE JUN 17 1997 THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 745 PM PDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEAST WASHINGTON ...STEVENS COUNTY AT 655 PM A SEVERE THUNDERSTORM WAS LOCATED JUST NORTHWEST OF COLVILLE. THIS STORM WAS MOVING TO THE NORTHEAST AT 30 MPH. BETWEEN 7 AND 730 PM...THIS SEVERE THUNDERSORMS WILL CONTINUE TO MOVE TO THE NORTHEAST OVER AREAS NORTH OF COLVILLE. GUSTY WINDS... LARGE HAIL AND HEAVY RAIN CAN BE EXPECTED. STEVENS COUNTY SHERIFF REPORTED ONE INCH HAIL AND HEAVY RAIN WHEN THIS STORM MOVED THROUGH KETTLE FALLS. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. &
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 7:34 PM PDT | Severe Thunderstorm Warning | OTX | Pend Oreille | 41 min |
Nearby
Severe Thunderstorm Warnings in Washington, 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.