Alert archive / Washington / Special Weather Statements in 2021
Special Weather Statement, NWS Spokane, WA
NWS Spokane, WA issued this special weather statement at Aug 3, 2021, 6:17 PM PDT. It was in force for 73 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
- Aug 3, 2021, 6:17 PM PDT (01:17 UTC)
- Expired
- Aug 3, 2021, 7:30 PM PDT
- In force
- 73 min
- Issued by
- NWS Spokane, WA
The radar
The Seattle radar (KATX), 136 km from the middle of the area, began a volume at 01:20 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
Quillayute State, WA (KUIL), launched 00:00Z, 1.3 hours before the alert went out and 286 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1439 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
399
WWUS86 KOTX 040117
SPSOTX
Special Weather Statement
National Weather Service Spokane WA
617 PM PDT Tue Aug 3 2021
WAZ042-040230-
East Slopes Northern Cascades WA-
617 PM PDT Tue Aug 3 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CHELAN AND WEST
CENTRAL OKANOGAN COUNTIES UNTIL 730 PM PDT...
At 615 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Stehekin, or 38 miles east of Darrington, moving
northeast at 20 mph.
Pea size hail and winds in excess of 40 mph will be possible with
this storm. Winds could also cause damage to trees or tree limbs
Locations impacted include...
Washington Pass, Klipchuck Campground, Rattlesnake Campground, Rivers
Bend Campground, Lone Fir Campground, Ballard Campground and Harts
Pass Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also possible with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4853 12082 4851 12080 4853 12071 4858 12069
4859 12072 4858 12076 4860 12078 4869 12071
4869 12069 4872 12067 4860 12043 4828 12082
4835 12094
TIME...MOT...LOC 0115Z 218DEG 16KT 4838 12080
$$
COTEThe office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 6:13 PM PDT | Special Weather Statement | OTX | Douglas | 62 min |
| Aug 3, 6:58 PM PDT | Special Weather Statement | OTX | Douglas | 62 min |
| Aug 3, 8:12 PM PDT | Special Weather Statement | OTX | Okanogan | 78 min |
| Aug 4, 1:53 PM PDT | Red Flag Warning | OTX | 31 hr | |
| Aug 3, 10:57 PM PDT | Special Weather Statement | OTX | Latah | 48 min |
Nearby
Special Weather Statements in Washington, 2021Every special weather statement in 2021
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.