Alert archive / Washington / Flash Flood Warnings in 2010

Flash Flood Warning 4, NWS Pendleton, OR

July 31, 2010Benton County, Yakima County, Washington

NWS Pendleton, OR issued this flash flood warning at Jul 31, 2010, 4:48 PM PDT for Benton County, Yakima County, Washington. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 31, 2010, 4:48 PM PDT (23:48 UTC)
Expired: Jul 31, 2010, 7:45 PM PDT
In force: 3 hr
Issued by: NWS Pendleton, OR
Area: Storm-based polygon
Flood severity: None

Counties Benton County, WA, Yakima County, WA

The radar

The Pendleton radar (KPDT), 122 km from the middle of the area, began a volume at 23:51 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 11.8 hours before the alert went out and 320 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: 69 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 2380 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 31, 4:33 PM PDT, 15 minutes earlier.

Area forecast discussion, Jul 31, 4:33 PM PDT, 15 minutes before

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Hazardous weather outlook, Jul 31, 9:53 AM PDT, 6 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
953 AM PDT SAT JUL 31 2010

UPDATED TO REMOVE RED FLAG WARNING INFORMATION

ORZ041>044-049-050-501>506-WAZ024-026>030-501-502-011515-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
CENTRAL OREGON-LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-
WALLOWA COUNTY-FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
953 AM PDT SAT JUL 31 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON, EAST SLOPES
     OF THE SOUTHERN CASCADES OF WASHINGTON, EASTERN COLUMBIA RIVER
     GORGE OF WASHINGTON, KITTITAS VALLEY, YAKIMA VALLEY, LOWER
     COLUMBIA BASIN OF WASHINGTON, FOOTHILLS OF THE BLUE MOUNTAINS
     OF WASHINGTON, NORTHWEST BLUE MOUNTAINS OF WASHINGTON, EASTERN
     COLUMBIA RIVER GORGE OF OREGON, NORTH CENTRAL OREGON, CENTRAL
     OREGON, LOWER COLUMBIA BASIN OF OREGON, GRANDE RONDE VALLEY,
     WALLOWA COUNTY, FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON,
     NORTHERN BLUE MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF
     OREGON, NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES, JOHN
     DAY BASIN, OCHOCO-JOHN DAY HIGHLANDS

A SMALL COMPACT WEATHER SYSTEM WILL MOVE FROM NORTHWEST OREGON TO
EXTREME NORTHERN IDAHO OVER THE NEXT 24 HOURS. THIS SYSTEM WILL
CONTINUE TO CAUSE ISOLATED TO SCATTERED THUNDERSTORMS. THUNDERSTORMS
WILL GRADUALLY DECREASE AND END FROM THE SOUTHWEST THROUGH THE
DAY. THE STRONGEST THUNDERSTORMS MAY OCCUR OVER WALLOWA COUNTY IN
THE AFTERNOON AND EVENING. THE STORM PREDICTION CENTER CURRENTLY
HAS PLACED WALLOWA... UNION AND SOUTHERN COLUMBIA COUNTIES WITHIN
A SLIGHT RISK OF SEVERE THUNDERSTORMS AREA.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS SUNDAY
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON

A MOSTLY DRY WEST-SOUTHWEST TO WEST FLOW WILL PERSIST OVER THE AREA
SUNDAY THROUGH THURSDAY. INSTABILITY MAY BECOME SUFFICIENT FOR THE
DEVELOPMENT OF STRAY AFTERNOON AND EVENING THUNDERSTORMS OVER SOME
OF THE MOUNTAIN RANGES AT TIMES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED DUE TO THUNDERSTORMS THROUGH
THIS EVENING.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:

WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML

ALL LETTERS IN THE ABOVE URL ARE LOWER CASE.

In the hours before

Local storm report, Jul 31, 1:27 PM PDT, 3 hours 21 minutes before

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Local storm report, Jul 31, 1:46 PM PDT, 3 hours 2 minutes before

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Special weather statement, Jul 31, 2:35 PM PDT, 2 hours 13 minutes before

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Local storm report, Jul 31, 3:17 PM PDT, 1 hour 31 minutes before

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Local storm report, Jul 31, 3:37 PM PDT, 1 hour 11 minutes before

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Special weather statement, Jul 31, 4:20 PM PDT, 28 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 8:22 PM PDT	Special Weather Statement	PDT	Wallowa	53 min
Jul 31, 4:20 PM PDT	Special Weather Statement	PDT	Wallowa	55 min
Jul 30, 11:06 PM PDT	Special Weather Statement	PDT	Yakima	54 min
Jul 31, 12:13 AM PDT	Special Weather Statement	PDT	Yakima	62 min
Jul 31, 12:53 AM PDT	Special Weather Statement	PDT	Yakima	67 min
Jul 31, 1:08 AM PDT	Special Weather Statement	PDT	Benton	52 min
Jul 31, 2:42 AM PDT	Special Weather Statement	PDT	Benton	63 min
Jul 31, 5:19 AM PDT	Special Weather Statement	PDT	Benton	56 min
Jul 31, 12:55 PM PDT	Special Weather Statement	PDT	Yakima	65 min
Jul 31, 2:35 PM PDT	Special Weather Statement	PDT	Yakima	55 min
Jul 31, 3:05 PM PDT	Red Flag Warning	PDT	Cowlitz	5 hr
Jul 31, 3:09 PM PDT	Severe Thunderstorm Warning	PDT	Kittitas	56 min
Jul 31, 3:20 PM PDT	Severe Thunderstorm Warning	PDT	Yakima	55 min
Jul 31, 4:06 PM PDT	Areal Flood Advisory	PDT	Benton, Yakima	47 min

Nearby

Flash Flood Warnings in Washington, 2010 Every flash flood warning in 2010

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.