Alert archive / Oregon / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 12, NWS Pendleton, OR

July 7, 2002Morrow County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 7, 2002, 8:52 PM PDT for Morrow County, Oregon. It was in force for 28 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 7, 2002, 8:52 PM PDT (03:52 UTC)
Expired: Jul 7, 2002, 9:20 PM PDT
In force: 28 min
Issued by: NWS Pendleton, OR
Area: Counties, with a storm outline in the text

County Morrow County, OR

The radar

The Pendleton radar (KPDT), 63 km from the middle of the area, began a volume at 03:51 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
Jul 7, 9:02 PM PDT	Hail 1.75	Boardman, OR

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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Salem/Mcnary, OR (KSLE), launched 00:00Z, 3.9 hours before the alert went out and 276 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 57 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.

936 
WUUS56 KPDT 080352
SVRPDT
ORC049-080420-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
851 PM PDT SUN JUL 7 2002

THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL MORROW COUNTY IN NORTHEAST OREGON

* UNTIL 920 PM PDT

* AT 851 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 12 MILES SOUTH OF BOARDMAN...OR ABOUT 20 MILES
  SOUTHWEST OF HERMISTON...MOVING NORTH AT 40 MPH.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
STURDY STRUCTURE.

LAT...LON 4564 11973 4569 11952 4588 11953 4582 11983

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 Jul 7, 8:30 PM PDT, 22 minutes earlier.

Area forecast discussion, Jul 7, 8:30 PM PDT, 22 minutes before

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT SUN JUL 7 2002

A LOW PRESSURE SYSTEM IS CROSSING OVER THE CASCADES.  THE SYSTEM IS
LIFTING THE WARM MOIST LOW LEVEL AIR EAST OF THE CASCADES RESULTING
IN SCATTERED THUNDERSTORMS.  SEVERAL THUNDERSTORMS HAVE BEEN SEVERE
WITH WITH .75 INCH HAIL AND WIND GUSTS IN EXCESS OF 50 MPH.  THE
STRONGEST WIND GUST REPORTED SO FAR IS 76 MPH AT THE PASCO AIRPORT.
THESE WINDS HAVE REDUCED VISIBILITIES BRIEFLY TO AS LOW AS ONE
QUARTER MILE IN THE COLUMBIA BASIN AND ALONG THE FOOTHILLS OF THE
BLUES.

THE FIRST BAND OF THUNDERSTORMS HAS MOVED INTO THE NORTHERN PORTION
OF THE COLUMBIA BASIN.  HOWEVER...A SECOND BAND OVER CENTRAL OREGON
IS SHOWING SIGNS OF INCREASING IN INTENSITY AS IT MOVES NORTH THIS
EVENING.

PDT 3200  ALW 3200  PSC 3000  YKM 3000

KPDT...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
Jul 7, 5:04 PM PDT	Severe Thunderstorm Warning	PDT	Union	56 min
Jul 7, 5:27 PM PDT	Severe Thunderstorm Warning	PDT	Crook, Jefferson	33 min
Jul 7, 6:02 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	43 min
Jul 7, 6:03 PM PDT	Severe Thunderstorm Warning	PDT	Jefferson, Wasco	27 min
Jul 7, 6:28 PM PDT	Severe Thunderstorm Warning	PDT	Gilliam, Sherman	47 min
Jul 7, 6:31 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla, Union	44 min
Jul 7, 10:08 PM PDT	Severe Thunderstorm Warning	PDT	Union	52 min
Jul 7, 10:44 PM PDT	Severe Thunderstorm Warning	PDT	Union	46 min
Jul 7, 11:21 PM PDT	Severe Thunderstorm Warning	PDT	Wallowa	69 min
Jul 8, 1:52 AM PDT	Severe Thunderstorm Warning	PDT	Wallowa	23 min
Jul 8, 2:16 AM PDT	Severe Thunderstorm Warning	PDT	Wallowa	44 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2002 Every severe thunderstorm warning in 2002

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.