Alert archive / Oregon / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 9, NWS Pendleton, OR

June 8, 2001Grant County, Umatilla County, Union County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jun 8, 2001, 6:38 PM PDT for Grant County, Umatilla County, Union County, Oregon. It was in force for 67 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jun 8, 2001, 6:38 PM PDT (01:38 UTC)
Expired: Jun 8, 2001, 7:45 PM PDT
In force: 67 min
Issued by: NWS Pendleton, OR
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Grant County, OR, Umatilla County, OR, Union County, OR

The radar

The Pendleton radar (KPDT), 73 km from the middle of the area, began a volume at 01:40 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

Time	Report	Where	Remark
Jun 8, 6:50 PM PDT	Hail 0.88	Ukiah, OR	Hail up to the size of nickels covered the ground at the Winom Creek Campground, which is located in the Blue Mountains at an elevation of 5500 feet.

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

Boise Airport, ID (KBOI), launched 00:00Z, 1.6 hours before the alert went out and 255 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: 4 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 3536 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 125 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.

000 
WUUS56 KPDT 090141
SVRPDT

ORC023-059-061-090245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM/FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
638 PM PDT FRI JUN 8 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM/FLASH FLOOD  WARNING FOR...
  NORTHEASTERN GRANT COUNTY IN EAST CENTRAL OREGON
  SOUTH CENTRAL UMATILLA COUNTY IN NORTHEAST OREGON
  SOUTHWESTERN UNION COUNTY IN NORTHEAST OREGON

* UNTIL 745 PM PDT

* AT 638 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NORTH CENTRAL GRANT COUNTY...OR ABOUT 43
  MILES SOUTHWEST OF LA GRANDE...MOVING NORTHEAST AT 20 MPH. SPOTTER 
  REPORTS INDICATE HEAVY RAIN WITH THIS STORM CAUSING FLOODING. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHEASTERN GRANT COUNTY AT 650 PM PDT
  RURAL SOUTHWESTERN UNION COUNTY AT 700 PM PDT

LARGE HAIL...DAMAGING WINDS...AND HEAVY RAINFALL ARE LIKELY WITH THISA
STORM. TAKE COVER IN A STURDY BUILDING...BUT AVOID LOW LYING AREAS  
UNTIL THE STORM HAS PASSED.

LAT...LON 4500 11901 4479 11869 4511 11806 4536 11845

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 8, 2:30 PM PDT, 4 hours 8 minutes earlier.

Area forecast discussion, Jun 8, 2:30 PM PDT, 4 hours 8 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT FRI JUN 8 2001

MID AND HIGH LEVEL CLOUDS...ASSOCIATED WITH THE DISTURBANCE THAT
MOVED EAST OF THE CASCADES THIS MORNING...CONTINUE TO LINGER OVER
MOST OF THE FORECAST AREA THIS AFTERNOON.  CLOUD COVER WILL
INFLUENCE THE AMOUNT OF CONVECTION THAT WILL DEVELOP IN THE NEXT 12
HOURS. SPC OUTLOOK HAS NEARLY ALL OF THE FORECAST AREA IN A SLIGHT
RISK OF SEVERE T-STORMS THIS AFTERNOON AND EVENING.  A SHORTWAVE
MOVING INLAND WILL HELP TO TRIGGER T-STORMS AS IT MOVES OVER THE
REGION.  DUE TO STEEP LAPSE RATES...UPPER LEVEL
DIFFLUENCE/DIVERGENCE...AND DECENT VERTICAL SHEAR...THE POTENTIAL
FOR ISOLATED SEVERE STORMS DOES EXIST.  HOWEVER...CLOUD COVER WILL
INHIBIT SOME T-STORM DEVELOPMENT.

MODELS HAVE A GOOD HANDLE OF SYNOPTIC PATTERN...BUT A POOR HANDLE OF
THE INDIVIDUAL DISTURBANCES EMBEDDED IN THE UPPER FLOW. PREFER THE
SLOWER ETA COMPARED TO THE AVN.  ETA KEEPS CONVECTION OVER THE
NORTHERN BLUES AND WALLOWAS THROUGH SATURDAY MORNING.  BY SATURDAY
AFTERNOON...THE FLOW ON THE BOTTOM OF THE TROUGH BECOMES WESTERLY.
ANY SHOWERS WILL MAINLY BE CONFINED TO THE MOUNTAINS AND ONLY
ISOLATED SHOWERS ARE EXPECTED.  OCCASIONAL BREEZY WINDS ARE ALSO
EXPECTED AS GRADIENTS TIGHTEN AT THE SURFACE.  SMITH

EXTENDED...A TROUGH MOVES THROUGH WASHINGTON AND OREGON MONDAY WITH
COOLER AIR AND CHANCE POPS OF SHOWERS AREAWIDE. WITH THE TROUGH AXIS
INTO IDAHO TUESDAY...WILL KEEP SLIGHT CHANCE POPS ONLY FOR THE
MOUNTAINS OF NORTHEAST OREGON AND SOUTHEAST WASHINGTON DUE TO
WRAPAROUND MOISTURE...OTHERWISE DRY AND COOL TUESDAY. A WARMING AND
DqRYING TREND WILL DEVELOP WITH HIGH PRESSURE ALOFT AND AT THE
SURFACE WEDNESDAY THROUGH FRIDAY.     FARMER

PDT 4211  ALW 4211  PSC 3111  YKM 3111

.KPDT...WSR-88D...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
Jun 8, 5:05 PM PDT	Severe Thunderstorm Warning	PDT	Grant	40 min
Jun 8, 5:42 PM PDT	Severe Thunderstorm Warning	PDT	Grant	48 min
Jun 8, 6:25 PM PDT	Severe Thunderstorm Warning	PDT	Grant	35 min
Jun 8, 6:30 PM PDT	Flash Flood Warning	PDT	Wallowa	2 hr
Jun 8, 7:05 PM PDT	Flash Flood Warning	PDT	Grant	115 min
Jun 8, 7:42 PM PDT	Severe Thunderstorm Warning	PDT	Union	63 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2001 Every severe thunderstorm warning in 2001

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.