Alert archive / Washington / Flash Flood Warnings in 2013

Flash Flood Warning 2, NWS Spokane, WA

June 29, 2013Chelan County, Washington

NWS Spokane, WA issued this flash flood warning at Jun 29, 2013, 1:30 PM PDT for Chelan County, Washington. It was in force for 90 min. 4 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
Jun 29, 2013, 1:30 PM PDT (20:30 UTC)
Expired
Jun 29, 2013, 3:00 PM PDT
In force
90 min
Issued by
NWS Spokane, WA
Area
Storm-based polygon
Flood severity
None

County Chelan County, WA

The radar

The Seattle radar (KATX), 181 km from the middle of the area, began a volume at 20:34 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

TimeReportWhereRemark
Jun 29, 1:30 PM PDTFLASH FLOOD1 Wsw Wenatchee, WACOCORAHS WA-CH-13 REPORTED 1.03 INCHES OF RAIN. STREETS BEGAN FLOODING AROUND 125 PM HALTING TRAFFIC AT INTERSECTIONS. LOWER LEVEL OF OUTBUILDING FLOODED.
Jun 29, 1:30 PM PDTFLASH FLOOD1 Wsw Wenatchee, WA1 TO 2 INCES OF WATER FLOWING DOWN THE STREETS CURB TO CURB ON ROADS LEADING OUT OF NUMBER 1 CANYON AND NUMBER 2 CANYON. ROADS ARE NOW CLEAR AS OF 3 PM.
Jun 29, 1:51 PM PDTFLASH FLOOD1 Wnw Wenatchee, WAREPORTS OF MANHOLE COVERS BEING BLOWN OFF FROM WATER IN THE MILLERDALE AVE TO SPRINGWATER AVE ALONG MILLER ST
Jun 29, 2:28 PM PDTFLASH FLOOD1 Nne Wenatchee, WAMUDFLOW ON THE US 2/97 JCT. SR 28

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, 8.5 hours before the alert went out and 300 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 2013-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 75 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 2013-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.193958Sfc1 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
75 J/kg
Mixed-layer CIN
-352 J/kg
Mixed-layer LCL
1679 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
80 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.

306 
WGUS56 KOTX 292030
FFWOTX
WAC007-292200-
/O.NEW.KOTX.FF.W.0002.130629T2030Z-130629T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
130 PM PDT SAT JUN 29 2013

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

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

* UNTIL 300 PM PDT

* AT 123 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  POSSIBLE FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NUMBER 2   
  CANYON BURN SCAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

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.

&&

LAT...LON 4746 12046 4748 12031 4740 12029 4738 12026
      4735 12035 4737 12049

$$

VAN HORN
2 follow-up statements
533 
WGUS76 KOTX 292057
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
157 PM PDT SAT JUN 29 2013

WAC007-292200-
/O.CON.KOTX.FF.W.0002.000000T0000Z-130629T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHELAN WA-
157 PM PDT SAT JUN 29 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM PDT FOR SOUTH
CENTRAL CHELAN COUNTY...

AT 149 PM PDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM 
PRODUCING FLASH FLOODING OVER THE WARNED AREA THAT INCLUDES STORM 
SEWER COVERS REPORTEDLY BLOWING OFF AND DEBRIS FLOWS. SPOTTERS HAVE 
ALSO REPORTED RAINFALL RATES OF UP TO A HALF AN INCH WITHIN 30 
MINUTES.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE NUMBER 2 
CANYON OUT INTO THE TOWN OF WENATCHEE... 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 4746 12046 4748 12031 4740 12029 4738 12026
      4735 12035 4737 12049

$$

VAN HORN
271 
WGUS76 KOTX 292158
FFSOTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
258 PM PDT SAT JUN 29 2013

WAC007-292208-
/O.EXP.KOTX.FF.W.0002.000000T0000Z-130629T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHELAN WA-
258 PM PDT SAT JUN 29 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 300 PM PDT FOR SOUTH
CENTRAL CHELAN COUNTY...

LAT...LON 4746 12046 4748 12031 4740 12029 4738 12026
      4735 12035 4737 12049

$$

VAN HORN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:33 AM PDTSpecial Weather StatementOTXChelan42 min
Jun 29, 7:53 AM PDTFlash Flood WarningOTXChelan37 min
Jun 29, 8:23 AM PDTSevere Thunderstorm WarningOTXGrant37 min
Jun 29, 10:54 AM PDTSpecial Weather StatementOTXAdams36 min
Jun 29, 11:45 AM PDTSpecial Weather StatementOTXSpokane30 min
Jun 29, 1:14 PM PDTFlash Flood WatchOTXChelan, Douglas, Okanogan7 hr
Jun 29, 2:08 PM PDTSpecial Weather StatementOTXGrant52 min
Jun 29, 2:24 PM PDTSpecial Weather StatementOTXDouglas51 min
Jun 29, 2:56 PM PDTFlash Flood WarningOTXChelan94 min
Jun 29, 3:00 PM PDTSpecial Weather StatementOTXFerry45 min
Jun 29, 3:48 PM PDTAreal Flood AdvisoryOTXOkanogan117 min
Jun 29, 4:03 PM PDTFlash Flood WarningOTXChelan87 min
Jun 29, 4:40 PM PDTFlash Flood WarningOTXChelan95 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.