Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 7, NWS Pendleton, OR

May 31, 1997Crook County, Deschutes County, Jefferson County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at May 31, 1997, 12:27 AM PDT for Crook County, Deschutes County, Jefferson County, Oregon. It was in force for 63 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 31, 1997, 12:27 AM PDT (07:27 UTC)
Expired
May 31, 1997, 1:30 AM PDT
In force
63 min
Issued by
NWS Pendleton, OR
Area
Whole counties

Counties Crook County, OR, Deschutes County, OR, Jefferson County, OR

The radar

The Pendleton radar (KPDT), 230 km from the middle of the area, began a volume at 07:28 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, 7.5 hours before the alert went out and 182 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 00:00Z on 1997-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 291 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1997-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.1939587897Sfc1 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
291 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
921 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.3

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 30, 8:33 PM PDT, 3 hours 54 minutes earlier.

Area forecast discussion, May 30, 8:33 PM PDT, 3 hours 54 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OREGON
830 PM PDT FRI MAY 30 1997

CNVCTN POPPED ALG OCHOCOS AND STRAWBERRIES WITH NUMEROUS LTG
STRIKES...HAIL <1/4 AND BRIEF HEAVY RAIN. THIS IS JUST A PRECURSOR
OF THINGS TO COME FOR SAT PM. MDLS STILL SHOWING TREND OF STG NEG
TILT TROF MOVG THROUGH PAC NW NEXT 24 HRS. HOWEVER 00Z ETA
INDICATING FNT SLOWER CROSSING CSCDS THAN 12Z PROGS AND THIS
ACCEPTED. LOW LVL MSTR IS IN PLACE WITH DEWPOINTS IN THE UPPER 50S/
LOWER 60S MOST OF THE E SIDE. MDLS INDICATE ATM TO REMAIN VERY
UNSTABLE THROUGH FORECAST PERIOD AND WITH FAVORABLE SHEAR TSRA
COULD APPROACH SVR MAINLY SE OR. 00Z ETA DOES CUTOFF MSTR PLUME TO
THE E SIDE BUT THIS SHUD HAVE LTL EFFECT ON THE OUTCOME. AS SUCH
WILL WORD ZONES A LTL STGR FOR TSTMS FOR TONIGHT AND SAT PM. FLOWS
BECOME ZONAL BHIND FRONT WITH NUMEROUS VORT LOBES IN THE GEN FLOW.
THIS SHOULD KEEP AT LEAST THE MTN OF -SHRA INr FORECAST. TOBIN

PDT 5732  ALW 5732  PSC 5721  YKM 5721

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

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 10:20 PM PDTSevere Thunderstorm WarningPDTUnion40 min
May 31, 12:55 AM PDTSevere Thunderstorm WarningPDTWasco65 min
May 31, 1:35 AM PDTSevere Thunderstorm WarningPDTGilliam, Sherman55 min
May 31, 2:26 AM PDTFlash Flood WarningPDTMorrow64 min
May 31, 2:26 AM PDTSevere Thunderstorm WarningPDTMorrow64 min
May 31, 3:05 AM PDTFlash Flood WarningPDTUmatilla85 min
May 31, 3:05 AM PDTSevere Thunderstorm WarningPDTUmatilla85 min
May 31, 8:41 AM PDTFlash Flood WarningPDTCrook, Jefferson2 hr
May 31, 9:10 AM PDTSevere Thunderstorm WarningPDTGilliam, Sherman, Wasco65 min
May 31, 9:10 AM PDTSevere Thunderstorm WarningPDTJefferson65 min
May 31, 9:25 AM PDTSevere Thunderstorm WarningPDTGilliam, Morrow65 min
May 31, 9:25 AM PDTSevere Thunderstorm WarningPDTSherman65 min
May 31, 9:39 AM PDTSevere Thunderstorm WarningPDTCrook, Deschutes, Jefferson66 min
May 31, 10:28 AM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla62 min
May 31, 10:55 AM PDTSevere Thunderstorm WarningPDTCrook65 min
May 31, 10:58 AM PDTSevere Thunderstorm WarningPDTMorrow62 min
May 31, 11:25 AM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla65 min
May 31, 11:45 AM PDTFlash Flood WarningPDTMorrow2 hr
May 31, 12:25 PM PDTSevere Thunderstorm WarningPDTUmatilla50 min
May 31, 1:05 PM PDTSevere Thunderstorm WarningPDTUnion55 min
May 31, 1:06 PM PDTSevere Thunderstorm WarningPDTUnion54 min
May 31, 1:10 PM PDTSevere Thunderstorm WarningPDTUnion50 min
May 31, 1:15 PM PDTSevere Thunderstorm WarningPDTUmatilla60 min
May 31, 1:25 PM PDTFlash Flood WarningPDTUmatilla2 hr
May 31, 2:29 PM PDTSevere Thunderstorm WarningPDTWallowa61 min
May 31, 9:48 AM PDTSevere Thunderstorm WarningPDTBenton, Klickitat57 min
May 31, 11:54 AM PDTSevere Thunderstorm WarningPDTColumbia, Walla Walla51 min
May 31, 2:25 PM PDTFlash Flood WarningPDTColumbia110 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1997Every 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.