Alert archive / Washington / Flash Flood Warnings in 2015

Flash Flood Warning 7, NWS Spokane, WA

May 29, 2015Chelan County, Washington

NWS Spokane, WA issued this flash flood warning at May 29, 2015, 3:37 PM PDT for Chelan 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 outline as issued.

The facts

Issued: May 29, 2015, 3:37 PM PDT (22:37 UTC)
Expired: May 29, 2015, 6:30 PM PDT
In force: 3 hr
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

County Chelan County, WA

The radar

The Seattle radar (KATX), 139 km from the middle of the area, began a volume at 22:40 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

Quillayute State, WA (KUIL), launched 12:00Z, 10.6 hours before the alert went out and 279 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: 1038 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 27 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.

312 
WGUS56 KOTX 292237
FFWOTX
WAC007-300130-
/O.NEW.KOTX.FF.W.0007.150529T2237Z-150530T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CHELAN COUNTY IN NORTH CENTRAL WASHINGTON...

* UNTIL 630 PM PDT
    
* AT 335 PM PDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING OR DEBRIS FLOW 
  IS EXPECTED TO BEGIN SHORTLY. EXCESSIVE RAINFALL OVER THE CHIWAUKUM 
  BURN SCAR COULD RESULT IN DEBRIS FLOW MOVING OVER SECTIONS OF 
HIGHWAY 2 BETWEEN WINTON AND NORTH OF LEAVENWORTH. THE DEBRIS FLOW
  CAN CONSIST OF ROCK...MUD...VEGETATION AND OTHER LOOSE MATERIALS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  TUMWATER CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4774 12077 4772 12073 4763 12071 4764 12084
      4772 12088

$$

SB

1 follow-up statement

727 
WGUS76 KOTX 300125
FFSOTX

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

WAC007-300134-
/O.EXP.KOTX.FF.W.0007.000000T0000Z-150530T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHELAN WA-
625 PM PDT FRI MAY 29 2015

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CHELAN COUNTY WILL EXPIRE
AT 630 PM PDT...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 4774 12077 4772 12073 4763 12071 4764 12084
      4772 12088

$$

SB

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, 3:49 PM PDT	Flash Flood Warning	OTX	Chelan, Douglas	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.