Alert archive / Oregon / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 20, NWS Pendleton, OR

June 30, 1998Umatilla County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 30, 1998, 2:31 PM PDT for Umatilla County, Oregon. It was in force for 59 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, 2:31 PM PDT (21:31 UTC)
Expired: Jun 30, 1998, 3:30 PM PDT
In force: 59 min
Issued by: NWS Pendleton, OR
Area: Whole counties

County Umatilla County, OR

The radar

The Pendleton radar (KPDT), 14 km from the middle of the area, began a volume at 21:32 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 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 Jun 30, 2:30 PM PDT, 1 minute earlier.

Area forecast discussion, Jun 30, 2:30 PM PDT, 1 minute before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT TUE JUN 30 1998

12Z KMFR AND KBOI UPPER AIR SOUNDINGS INDICATE INCREASING MOISTURE
IN MID AND UPPER ATMOSPHERE. THIS ALONG WITH WEAK SHORT WAVE
APPROACHING SW ORE COAST WILL HELP SCATTERED THUNDERSTORMS TO
CONTINUE DEVELOPING OVER MOUNTAINS E SIDE REMAINDER OF THIS
AFTERNOOON AND INTO EVENING. A SHORT WAVE IS EXPECTED TO DEVELOP
OFFSHORE AND MOVE INLAND FROM SW ORE COAST LATE WED AFTERNOON AND
EVENING FOR ANOTHER ROUND OF SCATTERED THUNDERSTORMS. BEST
THUNDERSTORM POTENTIAL WED IS EXPECTED IN BLUE MOUNTAINS AND
FOOTHILLS AND ALONG CASCADES. CONTINUED HOT WED WITH TEMPS REACHING
INTO THE MID TO UPPER 90S. FLOW ALOFT BACKS TO S AND BECOMES MORE
PRONOUNCED THU AS UPPER TROUGH BECOMES A CLOSED LOW OVER SW ORE.
AVN MODEL SUGGEST DIURNAL CONVECTION ALONG E SLOPES OF ORE CASCADES
TONIGHT AND WED NIGHT. INCREASING CLOUDINESS AND POPS THU AS WEAK
VORTICITY MAXES MOVE AROUND CUTOFF LOW AND TRIGGER CONVECTION OVER
FORECAST AREA. SURFACE THERMAL TROUGH SHIFTS E TO IDAHO THU FOR
MARINE AIR INTRUSION ALONG WITH MORE CLOUD COVER WILL COOL TEMPS
THU BY 6-8 DEGREES.  POLAN

PDT 2335  ALW 2335  PSC 1223  YKM 2333

.KPDT-88D...VCP21/CSR21.

.KPDT...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 4:37 PM PDT	Severe Thunderstorm Warning	PDT	Deschutes	48 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1998 Every 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; radar from the NEXRAD Level II archive.