Alert archive / Oregon / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Pendleton, OR

June 30, 1998Deschutes County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 30, 1998, 4:37 PM PDT for Deschutes County, Oregon. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 30, 1998, 4:37 PM PDT (23:37 UTC)
Expired
Jun 30, 1998, 5:25 PM PDT
In force
48 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Deschutes County, OR

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 12:00Z, 11.6 hours before the alert went out and 180 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-pSkew-T log-p diagram, Salem/Mcnary, OR at 12:00Z on 1998-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salem/Mcnary, OR at 12:00Z on 1998-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
531 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
44 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.

634 
WUUS1 KPDT 302339 RRA
SVRPDT
ORC017-010025-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
437 PM PDT TUE JUN 30 1998

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL DESCHUTES COUNTY IN CENTRAL OREGON

* UNTIL 525 PM PDT

* AT 433 PM PDT... SPOTTERS REPORTED A SEVERE THUNDERSTORM IN THE
  VICINITY OF TUMELO MOVING NORTH AT 15 MPH.  HAIL UP TO ONE INCH
  CAN BE EXPECTED WITH THIS STORM.

* THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
DESCHUTES                    AROUND 440 PM PDT
CLINE FALLS STATE PARK       AROUND 509 PM PDT


SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 2:31 PM PDTSevere Thunderstorm WarningPDTUmatilla59 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1998Every severe thunderstorm warning in 1998

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.