Alert archive / Washington / Flash Flood Warnings in 2013

Flash Flood Warning 13, NWS Spokane, WA

August 10, 2013Chelan County, Washington

NWS Spokane, WA issued this flash flood warning at Aug 10, 2013, 9:54 PM PDT for Chelan County, Washington. It was in force for 2 hr. 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: Aug 10, 2013, 9:54 PM PDT (04:54 UTC)
Expired: Aug 11, 2013, 12:00 AM PDT
In force: 2 hr
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

County Chelan County, WA

The radar

The Seattle radar (KATX), 182 km from the middle of the area, began a volume at 04:54 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
Aug 10, 10:15 PM PDT	FLASH FLOOD	6 Sse Rock Island, WA	REPORTS OF BASEMENTS BEING FLOODED ALONG WITH OUTBUILDINGS FROM PROLONGED PERIODS OF HEAVY RAINFALL. MUDSLIDES ALSO REPORTED AS A RESULT OF HEAVY RAINS.
Aug 10, 10:30 PM PDT	FLASH FLOOD	6 Ssw Rock Island, WA	RESIDENT REPORTED MINOR FLASH FLOOD JUST UPSTREAM OF KINGSBURY ROAD WHERE COLOCKUM CREEK FLOWS UNDER COLOCKUM RD. CREEK SWELLED OUT OF ITS BANKS AND ACROSS ROADWAY. NO DAMAGE TO ROAD. DAMAGE WAS SUSTAINED TO THE FENCE ADJACENT TO THE CREEK ON THE EDGE OF THE P

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 00:00Z, 4.9 hours before the alert went out and 301 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: 245 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 2795 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

566 
WGUS56 KOTX 110454
FFWOTX
WAC007-110700-
/O.NEW.KOTX.FF.W.0013.130811T0454Z-130811T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
954 PM PDT SAT AUG 10 2013

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN CHELAN COUNTY IN NORTH CENTRAL WASHINGTON...
  THIS INCLUDES THE CITY OF WENATCHEE...

* UNTIL MIDNIGHT PDT

* AT 951 PM PDT...FLASH FLOODING WAS REPORTED FROM A THUNDERSTORM
  OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SUNNYSLOPE
  AND CASHMERE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE AFFECTED AREAS ARE THE CANYON FIRE BURN SCARS IN NUMBER 1 AND
NUMBER 2 CANYONS ABOVE WENATCHEE. HIGH INTENSITY RAINFALL ON THE
BURNED AREAS CAN CAUSE DANGEROUS FLASH FLOODING AND DEBRIS FLOWS.
RESIDENTS AND MOTORISTS IN AND BELOW THE CANYONS...INCLUDING IN THE
CITY OF WENATCHEE...SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE
AND PROPERTY.

THE AFFECTED AREAS ARE THE PEAVINE CANYON FIRE BURN SCARS IN THE
MISSION CREEK DRAINAGE ABOVE CASHMERE. HIGH INTENSITY RAINFALL ON THE
BURNED AREAS MAY CAUSE DANGEROUS FLASH FLOODING AND DEBRIS FLOWS.
RESIDENTS AND MOTORISTS IN AND BELOW THE PEAVINE CANYON FIRE BURN
SCARS...INCLUDING THOSE THAT LIVE ALONG MISSION CREEK FROM THE BURN
SCAR TO THE WENATCHEE RIVER...SHOULD TAKE IMMEDIATE PRECAUTIONS TO
PROTECT LIFE AND PROPERTY.

THE AFFECTED AREAS ARE THE POISON CANYON FIRE BURN SCARS IN THE
MISSION CREEK DRAINAGE ABOVE CASHMERE. HIGH INTENSITY RAINFALL ON THE
BURNED AREAS MAY CAUSE DANGEROUS FLASH FLOODING AND DEBRIS FLOWS.
RESIDENTS AND MOTORISTS AND HIKERS IN AND BELOW THE POISON FIRE BURN
SCAR...INCLUDING THOSE THAT LIVE ALONG MISSION CREEK FROM THE BURN
SCAR TO THE WENATCHEE RIVER...SHOULD TAKE IMMEDIATE PRECAUTIONS TO
PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4761 12050 4752 12030 4743 12031 4740 12029
      4737 12013 4733 12008 4726 12011 4725 12037
      4731 12052 4730 12056 4733 12059 4734 12069

$$

1 follow-up statement

630 
WGUS76 KOTX 110707
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
1207 AM PDT SUN AUG 11 2013

WAC007-110704-
/O.EXP.KOTX.FF.W.0013.000000T0000Z-130811T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHELAN WA-
1207 AM PDT SUN AUG 11 2013

...THE FLASH FLOOD WARNING HAS ENDED FOR SOUTHEASTERN CHELAN COUNTY 
AT MIDNIGHT...

HOWEVER...THE CANYON FIRE BURN SCARS IN NUMBER 1 AND NUMBER 2 
CANYONS ABOVE WENATCHEE...PEAVINE CANYON FIRE...THE MISSION CREEK 
DRAINAGE ABOVE CASHMERE...AND THE POISON CANYON FIRE BURN SCARS WILL 
LIKELY SEE CONTINUED MINIMAL RUNOFF OF DEBRIS THROUGH 1245 AM. 
RESIDENTS AND MOTORISTS IN AND BELOW THE CANYONS SHOULD STILL BE ON 
THE LOOKOUT FOR THESE MINOR MUD OR DEBRIS FLOWS. THIS ALSO INCLUDES 
CAMPERS. 

LAT...LON 4761 12050 4752 12030 4743 12031 4740 12029
      4737 12013 4733 12008 4726 12011 4725 12037
      4731 12052 4730 12056 4733 12059 4734 12069

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 5:58 PM PDT	Special Weather Statement	OTX	Chelan	32 min
Aug 10, 6:32 PM PDT	Flash Flood Warning	OTX	Chelan	3 hr
Aug 10, 10:29 PM PDT	Special Weather Statement	OTX	Chelan	61 min
Aug 10, 10:47 PM PDT	Severe Thunderstorm Warning	OTX	Chelan, Douglas, Okanogan	58 min
Aug 10, 11:06 PM PDT	Special Weather Statement	OTX	Grant	9 min
Aug 11, 12:17 AM PDT	Flash Flood Warning	OTX	Chelan, Okanogan	3 hr
Aug 11, 2:19 PM PDT	Special Weather Statement	OTX		41 min
Aug 11, 3:27 PM PDT	Flash Flood Warning	OTX	Chelan, Okanogan	108 min
Aug 11, 3:57 PM PDT	Areal Flood Advisory	OTX	Okanogan	108 min
Aug 11, 4:24 PM PDT	Special Weather Statement	OTX	Asotin	36 min
Aug 11, 4:46 PM PDT	Special Weather Statement	OTX	Chelan	44 min
Aug 11, 4:57 PM PDT	Areal Flood Advisory	OTX	Asotin, Garfield	2 hr

Nearby

Flash Flood Warnings in Washington, 2013 Every flash flood warning in 2013

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.