Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 39, NWS Pendleton, OR

July 27, 1997Deschutes County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 27, 1997, 6:55 PM PDT for Deschutes County, Oregon. It was in force for 65 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: Jul 27, 1997, 6:55 PM PDT (01:55 UTC)
Expired: Jul 27, 1997, 8:00 PM PDT
In force: 65 min
Issued by: NWS Pendleton, OR
Area: Whole counties

County Deschutes County, OR

The radar

The Medford radar (KMAX), 237 km from the middle of the area, began a volume at 01:55 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, 1.9 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-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: 2331 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 69 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.

102 
WUUS1 KPDT 280158 RRA
SVRPDT
ORC017-280300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
655 PM PDT SUN JUL 27 1997
 
THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  800 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL OREGON
 
   ...SOUTHWESTERN DESCHUTES COUNTY
 
A SEVERE THUNDERSTORM IN NORTHWEST KLAMATH COUNTY IS MOVING SLOWLY
NORTHWARD AND WILL BE IN SOUTHWEST DESCHUTES COUNTY BY 700 PM.
PREVIOUS STORMS THAT WERE SIMILAR PRODUCED HAIL GREATER THAN AN
INCH IN DIAMETER.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DONT USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
 
JWS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pendleton, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 2:04 PM PDT, 4 hours 51 minutes earlier.

Area forecast discussion, Jul 27, 2:04 PM PDT, 4 hours 51 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
200 PM PDT SUN JUL 27 1997

AREA OF CLOUDS AND CONVECTION OVR NE OREG ASSOCIATED WITH WEAK VORT
THAT MODLS DIDN'T PICK UP TOO WELL IS MOVG INTO EXTRM NE OREG AND
N IDAHO.  MORE CONVECTION STARTING TO DEVELOP S CENT OREG ATTM.
THIS NEW AREA PROBLY WL CONTU AND PROPEGATE NE TONIGHT OVR CWA FOR
NOCTURNAL -TSTMS...SO WILL LEAVE SOME POPS IN FCST THRU THE NIGHT.
BETTER CONVECTION FOR LATE MON INTO TUES AS GULF OF AK TROUGH MOVES
CLOSER AND FLOW BACKS TO MORE S-SW ALLOWING TROP MONSOON MOISTURE
TO BE PUMPED INTO CWA.  BEST CHC LOOKS TO BE S CENT AND SE OREG...
BUT NE OREG AND SE WASH BLUES LIKELY TO GET SOME OF THE ACTION AS
WELL.  NGM IS MOST GUN-HO WITH MOISTURE...LIFT AND LOW LI'S. ETA IS
LEAST. AVN IS A COMPROMISE AND WILL GO WITH THAT. IT WILL TAKE A
WHILE FOR LWR ATMOS TO MOISTEN UP...SO MUCH OF STORMS COULD BEGEN
DRY IN LOWER ELEVATIONS. 850 TEMPS STAY FROM 21-25 SO WILL CONTINUE
VERY WARM TEMPS IN FCST DESPITE THAT MOS LOWERED THEM FROM PREV RUN
FOR MON AND TUES.
EXTENDED...TROUGH ALG PAC NW COAST FCST TO REMAIN WITH WARM AND
UNSTABLE SW FLOW OVR CWA.  4 CORNERS HIGH WILL TRY TO R>ESIST SO
WILL HAVE TO JUST WAIT AND SEE AS WEEK PROGRESSES.  RSC.

PDT 1231  ALW 1231  PSC -12-  YKM --1-

.KPDT...VCP21/CSR21...OPERATIONAL.

.KPDT...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 5:27 PM PDT	Severe Thunderstorm Warning	PDT	Deschutes	48 min
Jul 28, 4:20 PM PDT	Severe Thunderstorm Warning	PDT	Deschutes	40 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1997 Every severe thunderstorm warning in 1997

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.