Alert archive / Washington / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 21, NWS Spokane, WA
NWS Spokane, WA issued this severe thunderstorm warning at Jul 28, 2009, 5:08 PM PDT for Ferry County, Lincoln County, Stevens County, Washington. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2009, 5:08 PM PDT (00:08 UTC)
- Expired
- Jul 28, 2009, 6:00 PM PDT
- In force
- 52 min
- Issued by
- NWS Spokane, WA
- Area
- Storm-based polygon
Counties Ferry County, WA, Lincoln County, WA, Stevens County, WA
The radar
The Spokane radar (KOTX), 55 km from the middle of the area, began a volume at 00:11 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 nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.1 hours before the alert went out and 142 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
- 215 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 2530 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS56 KOTX 290008 SVROTX WAC019-043-065-290100- /O.NEW.KOTX.SV.W.0021.090729T0008Z-090729T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SPOKANE WA 508 PM PDT TUE JUL 28 2009 THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL LINCOLN COUNTY IN EAST CENTRAL WASHINGTON... SOUTH CENTRAL FERRY COUNTY IN NORTHEAST WASHINGTON... SOUTHWESTERN STEVENS COUNTY IN NORTHEAST WASHINGTON... * UNTIL 600 PM PDT * AT 503 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. THESE STORMS WERE LOCATED NORTH OF MILES AND EAST OF KELLER AND WERE MOVING SOUTH AT 20 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILES AND LINCOLN PRECAUTIONARY/PREPAREDNESS ACTIONS... FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY. && LAT...LON 4776 11806 4770 11841 4812 11860 4818 11825 TIME...MOT...LOC 0007Z 343DEG 16KT 4806 11833 4804 11843 $$ RP
2 follow-up statements
000 WWUS56 KOTX 290028 SVSOTX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SPOKANE WA 528 PM PDT TUE JUL 28 2009 WAC019-043-065-290100- /O.CON.KOTX.SV.W.0021.000000T0000Z-090729T0100Z/ FERRY WA-STEVENS WA-LINCOLN WA- 528 PM PDT TUE JUL 28 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM PDT FOR NORTH CENTRAL LINCOLN...SOUTHWESTERN STEVENS AND SOUTH CENTRAL FERRY COUNTIES... AT 527 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 11 MILES NORTH OF MILES...OR 46 MILES SOUTHEAST OF REPUBLIC...MOVING SOUTHEAST AT 20 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LINCOLN. PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. && LAT...LON 4776 11806 4770 11841 4812 11860 4818 11825 TIME...MOT...LOC 0028Z 334DEG 17KT 4806 11826 $$ RP
000 WWUS56 KOTX 290052 SVSOTX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SPOKANE WA 552 PM PDT TUE JUL 28 2009 WAC019-043-065-290101- /O.EXP.KOTX.SV.W.0021.000000T0000Z-090729T0100Z/ FERRY WA-STEVENS WA-LINCOLN WA- 552 PM PDT TUE JUL 28 2009 ...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL LINCOLN... SOUTHWESTERN STEVENS AND SOUTH CENTRAL FERRY COUNTIES WILL EXPIRE AT 600 PM PDT... THE STORM HAS MOVED EAST INTO SOUTHERN STEVENS COUNTY AND HAS WEAKEND IN INTENSITY AND...ALTHOUGH IT IS STILL PRODUCING HAIL THE SIZE OF PENNIES...IT IS NOT LONGER CONSIDERED SEVERE AND THE WARNING HAS BEEN ALLOWED TO EXPIRE AND THE STORM IS NOW BEING HIGHLIGHTED WITH A SIGNIFICANT WEATHER ADVISORY. LAT...LON 4776 11806 4770 11841 4812 11860 4818 11825 TIME...MOT...LOC 0051Z 334DEG 17KT 4796 11819 $$ RP
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 5:49 PM PDT | Special Weather Statement | OTX | Lincoln | 41 min |
| Jul 28, 6:35 PM PDT | Flash Flood Warning | OTX | Chelan | 55 min |
| Jul 28, 7:29 PM PDT | Severe Thunderstorm Warning | OTX | Stevens | 46 min |
| Jul 28, 8:13 PM PDT | Severe Thunderstorm Warning | OTX | Ferry, Stevens | 47 min |
Nearby
Severe Thunderstorm Warnings in Washington, 2009Every severe thunderstorm warning in 2009
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.