Alert archive / Washington / Flash Flood Warnings in 2013

Flash Flood Warning 9, NWS Spokane, WA

August 2, 2013Douglas County, Washington

NWS Spokane, WA issued this flash flood warning at Aug 2, 2013, 1:38 PM PDT for Douglas County, Washington. It was in force for 2 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
Aug 2, 2013, 1:38 PM PDT (20:38 UTC)
Expired
Aug 2, 2013, 3:45 PM PDT
In force
2 hr
Issued by
NWS Spokane, WA
Area
Storm-based polygon
Flood severity
None

County Douglas County, WA

The radar

The Spokane radar (KOTX), 109 km from the middle of the area, began a volume at 20:40 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

Spokane, WA (KOTX), launched 12:00Z, 8.6 hours before the alert went out and 197 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-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 2013-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2013-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
22 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
550 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
84 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.

789 
WGUS56 KOTX 022038
FFWOTX
WAC017-022245-
/O.NEW.KOTX.FF.W.0009.130802T2038Z-130802T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
138 PM PDT FRI AUG 2 2013

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME NORTHEASTERN DOUGLAS COUNTY IN NORTH CENTRAL WASHINGTON...

* UNTIL 345 PM PDT

* AT 131 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.  MUDLSIDES 
WILL BE POSSIBLE WITH THIS STORM.

* THE STORM PRODUCING VERY HEAVY RAIN WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4804 11900 4804 11899 4804 11897 4802 11895
      4798 11897 4800 11904 4805 11902

$$

SB
2 follow-up statements
794 
WGUS76 KOTX 022055
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
155 PM PDT FRI AUG 2 2013

WAC017-022245-
/O.CON.KOTX.FF.W.0009.000000T0000Z-130802T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS WA-
155 PM PDT FRI AUG 2 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT FOR
EXTREME NORTHEASTERN DOUGLAS COUNTY...

AT 140 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN OVER THE WARNED 
AREA.  RADAR ESTIMATED AS MUCH AS 1.00 TO 1.50 INCHES OF RAINFALL 
HAS ALREADY FALLEN FROM THIS STORM.

SOME ROADS THAT ARE IN THE WARNED AREA INCLUDE BARRY ROAD...HOUSE 
ROAD...PENDALL REX ROAD...AND WASHINGTON FLATS.  MUDSLIDES WILL BE 
POSSIBLE ALONG THE WESTERN SHORES OF RUFUS WOODS LAKE.

LAT...LON 4804 11900 4804 11899 4804 11897 4802 11895
      4798 11897 4800 11904 4805 11902

$$

SB
931 
WGUS76 KOTX 022238
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
338 PM PDT FRI AUG 2 2013

WAC017-022242-
/O.CAN.KOTX.FF.W.0009.000000T0000Z-130802T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS WA-
338 PM PDT FRI AUG 2 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME
NORTHEASTERN DOUGLAS COUNTY...

THE THUNDERSTORMS HAVE WEAKENED OVER NORTHEASTERN DOUGLAS COUNTY 
REDUCING THE THREAT FOR HEAVY RAINFALL AND FLASH FLOODING. SHOWERS 
AND ISOLATED THUNDERSTORMS WILL LIKELY CONTINUE OFF AND ON THROUGH 
THE AFTERNOON... BUT INTENSITIES ARE EXPECTED TO BE MUCH LESS AND 
FLASH FLOODING IS NOT EXPECTED.

LAT...LON 4804 11900 4804 11899 4804 11897 4802 11895
      4798 11897 4800 11904 4805 11902

$$

TY

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 5:05 PM PDTSpecial Weather StatementOTXKittitas40 min
Aug 1, 5:41 PM PDTAreal Flood AdvisoryOTXDouglas2 hr
Aug 1, 5:49 PM PDTAreal Flood AdvisoryOTXChelan, Douglas116 min
Aug 2, 1:01 PM PDTAreal Flood AdvisoryOTXFerry, Okanogan3 hr

Nearby

Flash Flood Warnings in Washington, 2013Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.