Alert archive / Washington / Special Weather Statements in 2021

Special Weather Statement, NWS Pendleton, OR

August 3, 2021Yakima County, Washington

NWS Pendleton, OR issued this special weather statement at Aug 3, 2021, 5:21 PM PDT for Yakima County, Washington. It was in force for 54 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, 5:21 PM PDT (00:21 UTC)
Expired: Aug 3, 2021, 6:15 PM PDT
In force: 54 min
Issued by: NWS Pendleton, OR

County Yakima County, WA

The radar

The Portland,OR radar (KRTX), 172 km from the middle of the area, began a volume at 00:24 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

Salem/Mcnary, OR (KSLE), launched 00:00Z, 0.4 hours before the alert went out and 241 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 178 J/kg
Mixed-layer CIN: -450 J/kg
Mixed-layer LCL: 1986 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

774 
WWUS86 KPDT 040021
SPSPDT

Special Weather Statement
National Weather Service Pendleton OR
521 PM PDT Tue Aug 3 2021
 
WAZ520-040115-
East Slopes of the Washington Cascades WA-
521 PM PDT Tue Aug 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN YAKIMA COUNTY UNTIL
615 PM PDT...

At 518 PM PDT, Doppler radar was tracking a strong thunderstorm near
Rimrock, or 21 miles east of Packwood, moving north at 15 mph.

HAZARD...Heavy rain, gusty winds of 40 to 50 mph possible, frequent
         lightning, and small hail possible.

SOURCE...Doppler radar indicated.

IMPACTS..Possible flooding of low lying areas and underpasses, small 
         streams and creeks, broken tree limbs from strong winds, 
         and new fire starts from lightning.

Locations impacted include...
Goose Prairie and Rimrock. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4669 12139 4672 12136 4673 12138 4696 12136
      4689 12085 4646 12099 4657 12140
TIME...MOT...LOC 0018Z 175DEG 14KT 4664 12123 

$$

RSC

The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 3, 6:23 PM PDT	Severe Thunderstorm Warning	PDT	Union	52 min
Aug 4, 2:05 PM PDT	Red Flag Warning	PDT		32 hr

Nearby

Special Weather Statements in Washington, 2021 Every 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.