Alert archive / Oregon / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 2, NWS Portland, OR

June 27, 2001Hood River County, Multnomah County, Oregon; Skamania County, Washington

NWS Portland, OR issued this severe thunderstorm warning at Jun 27, 2001, 11:15 AM PDT for Hood River County, Multnomah County, Oregon; Skamania County, Washington. It was in force for 45 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 27, 2001, 11:15 AM PDT (18:15 UTC)
Expired: Jun 27, 2001, 12:00 PM PDT
In force: 45 min
Issued by: NWS Portland, OR
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Hood River County, OR, Multnomah County, OR, Skamania County, WA

The radar

The Portland,OR radar (KRTX), 75 km from the middle of the area, began a volume at 18:18 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 12:00Z, 6.3 hours before the alert went out and 117 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: 89 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 650 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
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 Portland, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 9:00 AM PDT, 2 hours 15 minutes earlier.

Area forecast discussion, Jun 27, 9:00 AM PDT, 2 hours 15 minutes before

NORTHWEST OREGON AND SOUTHWEST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
900 AM PDT WED JUN 27 2001

CONVECTIVE CELL MOVING NORTHWARD JUST SOUTHWEST OF PORTLAND AT THIS
TIME. NO LIGHTNING INDICATED SO FAR...BUT OF CONCERN IS LINE OF
SMALLER CONVECTION LEFT BEHIND RUNNING NORTH TO SOUTH ALONG THE WEST
WILLAMETTE VALLEY. THIS MAY BE A FOCUS AREA LATER TODAY AS CONVECTION
GETS GOING. FORECASTS ARE IN GOOD SHAPE...BUT WILL MAKE THE CHANGE TO
A LITTLE MORE POSITIVE ON THE WORDING OF THUNDERSTORMS FROM CHANCE TO
SCATTERED. DRY SLOT HAS MOVED INTO WESTERN OREGON. THIS SHOULD ALLOW
FOR SOME BREAKS OF SUNSHINE...ENHANCING INSTABILITY. CAPE HIS HIGH
AND LIFTED INDEX LOW. SOUTHERLY FLOW GETS REPLACED WITH MORE STABLE
SOUTHWEST FLOW ALOFT TONIGHT AND THURSDAY. GALE DOWNGRADED TO SMALL
CRAFT ADVISORY. STARMER

AST 952 PDX +52 SLE 952 EUG 852

.KPDX...SMALL CRAFT ADVISORY COASTAL WATERS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 11:15 AM PDT	Severe Thunderstorm Warning	PQR	Clackamas	45 min
Jun 27, 12:23 PM PDT	Severe Thunderstorm Warning	PQR	Clackamas, Multnomah	52 min
Jun 27, 9:26 AM PDT	Severe Thunderstorm Warning	PQR	Clark	49 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2001 Severe Thunderstorm Warnings in Washington, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.