Alert archive / Washington / Flash Flood Warnings in 2015

Flash Flood Warning 8, NWS Spokane, WA

May 29, 2015Chelan County, Douglas County, Washington

NWS Spokane, WA issued this flash flood warning at May 29, 2015, 3:49 PM PDT for Chelan County, Douglas County, Washington. It was in force for 3 hr. 3 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: May 29, 2015, 3:49 PM PDT (22:49 UTC)
Expired: May 29, 2015, 6:45 PM PDT
In force: 3 hr
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

Counties Chelan County, WA, Douglas County, WA

The radar

The Seattle radar (KATX), 183 km from the middle of the area, began a volume at 22:49 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
May 29, 4:00 PM PDT	FLASH FLOOD	5 Nw Chelan, WA	DELAYED REPORT...HEAVY RAIN FROM THUNDERSTORM WASHED DEBRIS OUT ONTO WAPATO LAKE ROAD NEAR MILLS BAY CASINO.
May 29, 4:00 PM PDT	HEAVY RAIN 0	5 Nw Chelan, WA	DELAYED REPORT...HEAVY RAIN FROM THUNDERSTORM WASHED DEBRIS OUT ONTO WAPATO LAKE ROAD NEAR MILLS BAY CASINO.
May 29, 4:00 PM PDT	HEAVY RAIN 1	1 Nnw Manson, WA	1 INCH OF RAIN IN THE LAST HOUR.

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, 10.8 hours before the alert went out and 275 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: 1521 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 68 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.

337 
WGUS56 KOTX 292249
FFWOTX
WAC007-017-300145-
/O.NEW.KOTX.FF.W.0008.150529T2249Z-150530T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
349 PM PDT FRI MAY 29 2015

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN DOUGLAS COUNTY IN NORTHEASTERN WASHINGTON...
  EAST CENTRAL CHELAN COUNTY IN NORTH CENTRAL WASHINGTON...

* UNTIL 645 PM PDT
    
* AT 347 PM PDT...THE PUBLIC REPORTED A THUNDERSTORM PRODUCING HAIL AND 
  VERY HEAVY RAINS ACROSS THE WARNED AREA. UP TO ONE INCH OF RAIN HAS ALREADY
  FALLEN. FLASH FLOODING MAY BE OCCURRING OR IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHELAN...STAYMAN...LAKE CHELAN STATE PARK...MANSON...CHELAN FALLS
  AND AZWELL.  HIGHWAY 2 BETWEEN WATERVILLE AND ORONDO MAY EXPERIENCE MUDSLIDES
  OR FLASH FLOODING DUE TO THE STEEP TERRAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4790 12030 4797 12016 4797 12007 4796 12004
      4796 11988 4797 11987 4797 11974 4773 11998
      4779 12040

$$

SB

2 follow-up statements

385 
WGUS76 KOTX 292353
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
453 PM PDT FRI MAY 29 2015

WAC007-017-300145-
/O.CON.KOTX.FF.W.0008.000000T0000Z-150530T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS WA-CHELAN WA-
453 PM PDT FRI MAY 29 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT FOR
NORTHWESTERN DOUGLAS AND EAST CENTRAL CHELAN COUNTIES...

AT 450 PM PDT...LOCAL LAW ENFORCEMENT REPORTED FLOODING IN MANSON 
ALONG WITH A MUDSLIDE ON STATE ROUTE 150 AT ROCKY POINT.  
THERE ARE NO THUNDERSTORMS OVER THE WARNED AREA AS OF 5PM...HOWEVER
MORE STORMS ARE APPROACHING FROM THE WEST AND COULD BRING ANOTHER 
ROUND OF HEAVY RAIN BETWEEN 6 AND 8 PM.  

OVER AN INCH OF RAIN HAS ALREADY FALLEN. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHELAN...STAYMAN...LAKE CHELAN STATE PARK...MANSON...CHELAN FALLS AND
AZWELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 4790 12030 4797 12016 4797 12007 4796 12004
      4796 11988 4797 11987 4797 11974 4773 11998
      4779 12040

$$

SB

233 
WGUS76 KOTX 300114
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
614 PM PDT FRI MAY 29 2015

WAC007-017-300124-
/O.CAN.KOTX.FF.W.0008.000000T0000Z-150530T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS WA-CHELAN WA-
614 PM PDT FRI MAY 29 2015

...THE FLASH FLOOD WARNING FOR NORTHWESTERN DOUGLAS AND EAST CENTRAL
CHELAN COUNTIES IS CANCELLED...

THE THUNDERSTORMS PRODUCING THE HEAVY RAINFALL HAVE MOVED OUT 
OF THE AREA...AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT.

LAT...LON 4790 12030 4797 12016 4797 12007 4796 12004
      4796 11988 4797 11987 4797 11974 4773 11998
      4779 12040

$$

RP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 6:27 PM PDT	Flash Flood Warning	OTX	Okanogan	3 hr
May 28, 7:01 PM PDT	Areal Flood Advisory	OTX	Spokane	119 min
May 29, 9:01 AM PDT	Flash Flood Watch	OTX		11 hr
May 29, 2:00 PM PDT	Special Weather Statement	OTX	Okanogan	45 min
May 29, 2:13 PM PDT	Flash Flood Warning	OTX	Okanogan	3 hr
May 29, 2:20 PM PDT	Special Weather Statement	OTX	Okanogan	25 min
May 29, 2:31 PM PDT	Flash Flood Warning	OTX	Okanogan	3 hr
May 29, 2:54 PM PDT	Severe Thunderstorm Warning	OTX	Chelan	51 min
May 29, 3:17 PM PDT	Special Weather Statement	OTX	Stevens	43 min
May 29, 3:33 PM PDT	Severe Thunderstorm Warning	OTX	Ferry, Stevens	42 min
May 29, 3:37 PM PDT	Flash Flood Warning	OTX	Chelan	3 hr
May 29, 3:57 PM PDT	Severe Thunderstorm Warning	OTX	Okanogan	48 min
May 29, 4:32 PM PDT	Special Weather Statement	OTX	Douglas	43 min
May 29, 4:47 PM PDT	Areal Flood Advisory	OTX	Okanogan	3 hr

Nearby

Flash Flood Warnings in Washington, 2015 Every flash flood warning in 2015

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.