Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 4, NWS Pendleton, OR

May 14, 1997Umatilla County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at May 14, 1997, 5:28 PM PDT for Umatilla County, Oregon. It was in force for 47 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: May 14, 1997, 5:28 PM PDT (00:28 UTC)
Expired: May 14, 1997, 6:15 PM PDT
In force: 47 min
Issued by: NWS Pendleton, OR
Area: Whole counties

County Umatilla County, OR

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 0.5 hours before the alert went out and 342 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: 110 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1475 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 14, 2:42 PM PDT, 2 hours 46 minutes earlier.

Area forecast discussion, May 14, 2:42 PM PDT, 2 hours 46 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
240 PM PDT WED MAY 14 1997

BIG THANK YOU TO KOTX FOR RUNNING THE 19Z SOUNDINGS AND THE HEADS-
UP TO NEIGHBORING OFFICES.

TS FORMING IN CENT ORE AS SKIES CLR UP. TOPS REACHING 35K AND
SPOTTERS CONFIRM TS BUT NO REPORTS OF HAILS THUS FAR. WITH LI'S OF
-4 AND CAPE AT LEAST 750 ERN ORE/SE WASH COULD SEE MORE CNVCTN INTO
LATE EVNG. HI CAPES PROGGED TO CONT ACRS NE MTNS AND SE ORE THUT
TNGT AND MTNS ZONES COULD SEE PROLONGED CNVCTN. DP IN THE 50S IN
THE LOWER BASIN AND FOOTHILLS AND HVY RA PSBL. SATL IMGRY AND RADAR
SHOW CELLS MOVG AT A GOOD SPEED. AT PRESENT FLASH FLDG APPRS LESS
LIKELY BUT WILL ALERT ONCOMING SHIFT ON THE POTENTIAL. MDLS SHOW W
FLO PUSHING INTO WRN COL GORGE THURS BUT NOT QUITE TO THE FOOTHILL.
AMS STL UNSTABLE THURS FOR ANTHR ROUND OF AFTN CNVCTN. RDG PROGGEDF
TO FLATTED SLGTLY AS NRN STM S/WV BRUSHES ACRS NRN WASH WITH SOME
COOLING.
FB

PDT 2221  ALW 2221  PSC 111-  YKM 211-

.PDT...FLOOD WARNING CONTINUES FOR NACHES RVR IN YAKIMA CNTY.
       FLOOD WARNING CONTINUES FOR YAKIMA RVR IN YAKIMA CNTY.
       FLOOD WARNING CONTINUES FOR IMNAHA RVR IN WALLOWA CNTY.

.KPDT...VCP21/CSR21...OPERATIONAL.
...CORRECTED POPS.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 5:13 PM PDT	Flash Flood Warning	PDT	Morrow	47 min
May 14, 5:13 PM PDT	Severe Thunderstorm Warning	PDT	Morrow	47 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.