Alert archive / Washington / Flash Flood Warnings in 2009

Flash Flood Warning 2, NWS Spokane, WA

June 15, 2009Stevens County, Washington

NWS Spokane, WA issued this flash flood warning at Jun 15, 2009, 3:56 PM PDT for Stevens County, Washington. It was in force for 64 min. 2 reports 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: Jun 15, 2009, 3:56 PM PDT (22:56 UTC)
Expired: Jun 15, 2009, 5:00 PM PDT
In force: 64 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

County Stevens County, WA

The radar

The Spokane radar (KOTX), 130 km from the middle of the area, began a volume at 22:57 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 15, 4:05 PM PDT	HEAVY RAIN 1.41	8 Se Northport, WA	SPOTTER STEVENS 5 MEASURED 1.41 INCHES OF RAIN IN 40 MINUTES. STORM ENDED SOON AFTER.
Jun 15, 4:30 PM PDT	FLASH FLOOD	8 Se Northport, WA	STORM SURVEY ON 6/17 INDICATED MUD AND DEBRIS FLOW ACROSS ALADDIN ROAD NEAR SPIRIT FROM HEAVY RAINS ON 6/15. PUBLIC ALSO CONFIRMED THE ROAD WAS IMPASSIBLE FOR SOME TIME DURING THE EVENT. MINOR EROSION OF THE ROAD EMBANKMENT WAS ALSO NOTED APPROX. 1 MILE EAST O

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.9 hours before the alert went out and 155 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: 165 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 30 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 
WGUS56 KOTX 152256
FFWOTX
WAC065-160000-
/O.NEW.KOTX.FF.W.0002.090615T2256Z-090616T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
356 PM PDT MON JUN 15 2009

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN STEVENS COUNTY IN NORTHEAST WASHINGTON...

* UNTIL 500 PM PDT

* AT 351 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
POSSIBLE FLASH FLOODING FROM A HEAVY THUNDERSTORM OVER THE WARNED 
AREA.  RAINFALL AMOUNTS OF ONE TO TWO INCHES WERE OBSERVED
ON DOPPLER RADAR WITH THIS STORM.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

FLASH FLOODING IS MOST LIKELY TO IMPACT DEEP CREEK DRAINAGE NEAR 
NORTHPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4890 11749 4884 11751 4884 11753 4883 11757
      4879 11756 4873 11765 4888 11777 4890 11771

$$

SB

1 follow-up statement

000 
WGUS76 KOTX 152358
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
458 PM PDT MON JUN 15 2009

WAC065-160005-
/O.EXP.KOTX.FF.W.0002.000000T0000Z-090616T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
STEVENS WA-
458 PM PDT MON JUN 15 2009

...THE FLASH FLOOD WARNING WILL EXPIRE AT 500 PM PDT FOR NORTHEASTERN
STEVENS COUNTY...

THE HEAVY THUNDERSTORM WHICH PRODUCED HEAVY RAIN OVER THE AREA HAS 
MOVED AWAY. WHILE NO FLASH FLOODING HAS YET BEEN REPORTED...A 
SPOTTER UNDER THE STORM REPORTED 1.41 INCHES OF RAIN FALL IN 40 
MINUTES. 


LAT...LON 4890 11749 4884 11751 4884 11753 4883 11757
      4879 11756 4873 11765 4888 11777 4890 11771

$$

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 14, 5:11 PM PDT	Areal Flood Advisory	OTX	Douglas, Ferry, Grant, Lincoln, Okanogan, Stevens	4 hr
Jun 14, 7:10 PM PDT	Areal Flood Advisory	OTX	Douglas, Grant, Lincoln	5 hr
Jun 14, 7:21 PM PDT	Areal Flood Advisory	OTX	Spokane	2 hr
Jun 15, 1:44 PM PDT	Areal Flood Advisory	OTX	Ferry	3 hr
Jun 15, 3:22 PM PDT	Areal Flood Advisory	OTX	Ferry, Okanogan	3 hr

Nearby

Flash Flood Warnings in Washington, 2009 Every flash flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.