Alert archive / Washington / Flash Flood Warnings in 2016

Flash Flood Warning 8, NWS Spokane, WA

July 21, 2016Okanogan County, Washington

NWS Spokane, WA issued this flash flood warning at Jul 21, 2016, 7:06 PM PDT for Okanogan County, Washington. It was in force for 114 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2016, 7:06 PM PDT (02:06 UTC)
Expired: Jul 21, 2016, 9:00 PM PDT
In force: 114 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

County Okanogan County, WA

The radar

The Spokane radar (KOTX), 171 km from the middle of the area, began a volume at 02:07 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 00:00Z, 2.1 hours before the alert went out and 256 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: 3234 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

223 
WGUS56 KOTX 220206
FFWOTX
WAC047-220400-
/O.NEW.KOTX.FF.W.0008.160722T0206Z-160722T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
706 PM PDT THU JUL 21 2016

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL OKANOGAN COUNTY IN NORTHEASTERN WASHINGTON...

* UNTIL 900 PM PDT
    
* AT 705 PM PDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE NORTHEAST SIDE OF THE CARLTON COMPLEX. FLASH
  FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MALOTT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

MOVE AWAY FROM RECENTLY BURNED AREAS. LIFE THREATENING FLOODING OF
CREEKS...ROADS AND NORMALLY DRY ARROYOS IS LIKELY. THE HEAVY RAINS
WILL LIKELY TRIGGER ROCKSLIDES...MUDSLIDES AND DEBRIS FLOWS IN STEEP
TERRAIN...ESPECIALLY IN AND AROUND THESE AREAS.

THE AFFECTED AREAS ARE IN AND BELOW THE CARLTON COMPLEX FIRE BURN
SCARS ABOVE THE METHOW RIVER VALLEY. HIGH INTENSITY RAINFALL ON THE
BURNED AREAS MAY CAUSE FLASH FLOODING...DEBRIS FLOWS...MUD SLIDES AND
ROCK SLIDES. RESIDENTS AND MOTORISTS IN AND BELOW THE CARLTON COMPLEX
FIRE BURN SCAR IN THE METHOW VALLEY...INCLUDING MOTORISTS ON HIGHWAY
97A FROM CHELAN TO BREWSTER...AND STATE HIGHWAY 153 FROM PATEROS TO
TWISP...SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND
PROPERTY.

&&

LAT...LON 4833 11961 4820 11968 4827 11987 4838 11986

$$

BT

1 follow-up statement

735 
WGUS76 KOTX 220317
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
817 PM PDT THU JUL 21 2016

WAC047-220327-
/O.CAN.KOTX.FF.W.0008.000000T0000Z-160722T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OKANOGAN WA-
817 PM PDT THU JUL 21 2016

...THE FLASH FLOOD WARNING FOR CENTRAL OKANOGAN COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4833 11961 4820 11968 4827 11987 4838 11986

$$

RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 5:39 PM PDT	Areal Flood Advisory	OTX	Chelan, Okanogan	3 hr
Jul 21, 7:29 PM PDT	Areal Flood Advisory	OTX	Okanogan	3 hr
Jul 21, 8:53 PM PDT	Areal Flood Advisory	OTX	Chelan	3 hr
Jul 22, 5:37 AM PDT	Flash Flood Watch	OTX	Chelan, Douglas, Ferry, Grant, Okanogan	11 hr
Jul 22, 11:14 AM PDT	Areal Flood Advisory	OTX	Chelan, Okanogan	2 hr
Jul 22, 12:37 PM PDT	Special Weather Statement	OTX	Douglas	38 min
Jul 22, 1:46 PM PDT	Areal Flood Advisory	OTX	Ferry, Okanogan	3 hr
Jul 22, 2:04 PM PDT	Areal Flood Advisory	OTX	Stevens	3 hr
Jul 22, 3:22 PM PDT	Special Weather Statement	OTX	Spokane	38 min
Jul 22, 3:54 PM PDT	Severe Thunderstorm Warning	OTX	Spokane	51 min
Jul 22, 4:52 PM PDT	Severe Thunderstorm Warning	OTX	Spokane	34 min

Nearby

Flash Flood Warnings in Washington, 2016 Every flash flood warning in 2016

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.