Alert archive / Oregon / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 21, NWS Pendleton, OR

August 16, 2013Union County, Wallowa County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Aug 16, 2013, 6:52 PM PDT for Union County, Wallowa County, Oregon. It was in force for 53 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 16, 2013, 6:52 PM PDT (01:52 UTC)
Expired: Aug 16, 2013, 7:45 PM PDT
In force: 53 min
Issued by: NWS Pendleton, OR
Area: Storm-based polygon

Counties Union County, OR, Wallowa County, OR

The radar

The Pendleton radar (KPDT), 82 km from the middle of the area, began a volume at 01:54 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 16, 6:55 PM PDT	TSTM WND DMG	15 N Elgin, OR	SEVERAL LARGE TREE LIMBS DOWN. ALSO 1/2 INCH HAIL.

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

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 1.9 hours before the alert went out and 237 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2504 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

494 
WUUS56 KPDT 170152
SVRPDT
ORC061-063-170245-
/O.NEW.KPDT.SV.W.0021.130817T0152Z-130817T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
652 PM PDT FRI AUG 16 2013

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL UNION COUNTY IN NORTHEAST OREGON...
  NORTHWESTERN WALLOWA COUNTY IN NORTHEAST OREGON...

* UNTIL 745 PM PDT

* AT 645 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS
  IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 12 MILES WEST OF
  MINAM...OR 24 MILES NORTH OF LA GRANDE...AND MOVING NORTHEAST AT 35
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TROY

IF YOU EXPERIENCE SEVERE WEATHER PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN PENDLETON AT 1...8...0...0...2...4...0...4...5...2...7.

LAT...LON 4565 11750 4556 11795 4578 11805 4581 11803
      4582 11797 4592 11798 4600 11794 4598 11730
TIME...MOT...LOC 0151Z 229DEG 29KT 4570 11792

$$

MDV

1 follow-up statement

820 
WWUS56 KPDT 170234
SVSPDT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PENDLETON OR
734 PM PDT FRI AUG 16 2013

ORC061-063-170243-
/O.CAN.KPDT.SV.W.0021.000000T0000Z-130817T0245Z/
UNION OR-WALLOWA OR-
734 PM PDT FRI AUG 16 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WALLOWA AND NORTH
CENTRAL UNION COUNTIES IS CANCELLED...

THE STORM HAS EXITED THE WARNED AREA. A STRONG STORM CONTINUES 
ACROSS NORTH EAST WALLOWA COUNTY.

LAT...LON 4565 11750 4556 11795 4578 11805 4581 11803
      4582 11797 4592 11798 4600 11794 4598 11730
TIME...MOT...LOC 0233Z 229DEG 29KT 4592 11755

$$

MDV

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 5:48 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	57 min
Aug 16, 5:53 PM PDT	Severe Thunderstorm Warning	PDT	Crook, Jefferson	67 min
Aug 16, 7:32 PM PDT	Special Weather Statement	PDT	Wallowa	58 min
Aug 17, 4:42 PM PDT	Red Flag Warning	PDT		2 hr

Nearby

Severe Thunderstorm Warnings in Oregon, 2013 Every severe thunderstorm warning in 2013

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.