Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 10, NWS Pendleton, OR

May 31, 1997Morrow County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at May 31, 1997, 2:26 AM PDT for Morrow County, Oregon. It was in force for 64 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 31, 1997, 2:26 AM PDT (09:26 UTC)
Expired
May 31, 1997, 3:30 AM PDT
In force
64 min
Issued by
NWS Pendleton, OR
Area
Whole counties

County Morrow County, OR

The radar

The Pendleton radar (KPDT), 64 km from the middle of the area, began a volume at 09:29 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

TimeReportWhereRemark
May 31, 2:30 AM PDTHail 1.75Ione, ORA farmer reported severe damage to wheat crop. Hail dented three vehicles.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 9.4 hours before the alert went out and 273 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 31, 2:00 AM PDT, 26 minutes earlier.

Area forecast discussion, May 31, 2:00 AM PDT, 26 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OREGON
200 AM PDT SAT MAY 31 1997

A FEW SEVERE TS CONTINUE ATTM.  DUE TO PRIORITY...THIS PRODUCT IS
DELAYED WITH ESTIMATED TIME OF NEXT ISSUANCE AT 830 AM.  SB

PDT 6311  ALW 6311  PSC 6211  YKM 6211

.KPDT...VCP11/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, 12:27 AM PDTSevere Thunderstorm WarningPDTCrook, Deschutes, Jefferson63 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, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.