Alert archive / Oregon / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Pendleton, OR

August 2, 2021Crook County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Aug 2, 2021, 1:21 PM PDT for Crook County, Oregon. It was in force for 24 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 2, 2021, 1:21 PM PDT (20:21 UTC)
Expired: Aug 2, 2021, 1:45 PM PDT
In force: 24 min
Issued by: NWS Pendleton, OR
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Crook County, OR

The radar

The Portland,OR radar (KRTX), 235 km from the middle of the area, began a volume at 20:24 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.

What was reported inside it

Time	Report	Where	Remark
Aug 2, 1:40 PM PDT	HAIL 1	11 S Powell Butte, OR	SPOTTER REPORTED QUARTER SIZED HAIL, WITH DAMAGE TO ALUMINUM SIDING. PONDING DUE HEAVY RAIN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 12:00Z, 8.4 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1459 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

201 
WUUS56 KPDT 022021
SVRPDT
ORC013-022045-
/O.NEW.KPDT.SV.W.0004.210802T2021Z-210802T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pendleton OR
121 PM PDT Mon Aug 2 2021

The National Weather Service in Pendleton Oregon has issued a

* Severe Thunderstorm Warning for...
  West central Crook County in central Oregon...

* Until 145 PM PDT.

* At 120 PM PDT, a severe thunderstorm was located near Alfalfa, or
  14 miles south of Prineville, moving northeast at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Prineville and Powell Butte. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4408 12099 4413 12099 4414 12100 4414 12110
      4415 12110 4438 12109 4433 12045 4399 12078
TIME...MOT...LOC 2020Z 218DEG 9KT 4411 12095 

HAIL...1.00IN
WIND...<50MPH
 
$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 2:46 AM PDT	Excessive Heat Watch	PDT	Gilliam, Morrow, Sherman, Umatilla, Wasco, Wheeler	11 hr
Aug 2, 3:27 AM PDT	Red Flag Warning	PDT		20 hr
Aug 2, 1:45 PM PDT	Severe Thunderstorm Warning	PDT	Crook	27 min
Aug 2, 2:06 PM PDT	Heat Advisory	PDT	Gilliam, Morrow, Sherman, Umatilla, Wasco, Wheeler	57 hr

Nearby

Severe Thunderstorm Warnings in Oregon, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.