Alert archive / Washington / Flash Flood Warnings in 2012

Flash Flood Warning 3, NWS Spokane, WA

July 20, 2012Grant County, Washington

NWS Spokane, WA issued this flash flood warning at Jul 20, 2012, 1:15 PM PDT for Grant County, Washington. It was in force for 60 min. 1 report 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: Jul 20, 2012, 1:15 PM PDT (20:15 UTC)
Expired: Jul 20, 2012, 2:15 PM PDT
In force: 60 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Flood severity: None

County Grant County, WA

The radar

The Pendleton radar (KPDT), 150 km from the middle of the area, began a volume at 20:14 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
Jul 20, 1:15 PM PDT	FLASH FLOOD	Moses Lake, WA	FLOODING WAS REPORTED AND QUARTER SIZE HAIL.

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, 8.3 hours before the alert went out and 250 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: 2619 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 66 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.

695 
WGUS56 KOTX 202015
FFWOTX
WAC025-202115-
/O.NEW.KOTX.FF.W.0003.120720T2015Z-120720T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
115 PM PDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN GRANT COUNTY IN CENTRAL WASHINGTON...
  THIS INCLUDES THE CITY OF MOSES LAKE...

* UNTIL 215 PM PDT

* AT 111 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROYAL CITY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...LOWER CRAB 
CREEK...FRENCHMAN HILLS WASTEWAY...SAND HOLLOW LAKE...CRAB CREEK AND 
WINCHESTER WASTEWAY.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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.

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 4713 11923 4665 11962 4667 11994 4721 11962

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 12:26 AM PDT	Special Weather Statement	OTX	Okanogan	49 min
Jul 20, 1:09 AM PDT	Special Weather Statement	OTX	Okanogan	51 min
Jul 20, 1:10 AM PDT	Areal Flood Advisory	OTX	Okanogan	4 hr
Jul 20, 11:34 AM PDT	Special Weather Statement	OTX		56 min
Jul 20, 12:17 PM PDT	Flash Flood Warning	OTX	Asotin	28 min
Jul 20, 12:19 PM PDT	Special Weather Statement	OTX	Asotin	41 min
Jul 20, 12:39 PM PDT	Severe Thunderstorm Warning	OTX	Asotin	51 min
Jul 20, 12:59 PM PDT	Severe Thunderstorm Warning	OTX	Grant	46 min
Jul 20, 1:04 PM PDT	Areal Flood Advisory	OTX	Asotin	4 hr
Jul 20, 1:15 PM PDT	Severe Thunderstorm Warning	OTX	Grant	60 min
Jul 20, 1:46 PM PDT	Severe Thunderstorm Warning	OTX	Douglas, Grant	44 min
Jul 20, 2:08 PM PDT	Areal Flood Advisory	OTX	Grant	3 hr
Jul 20, 2:22 PM PDT	Flash Flood Warning	OTX	Okanogan	83 min
Jul 20, 2:29 PM PDT	Severe Thunderstorm Warning	OTX	Garfield, Whitman	46 min
Jul 20, 2:33 PM PDT	Special Weather Statement	OTX	Okanogan	57 min
Jul 20, 2:34 PM PDT	Flash Flood Warning	OTX	Okanogan	86 min
Jul 20, 2:47 PM PDT	Severe Thunderstorm Warning	OTX	Okanogan	58 min
Jul 20, 3:17 PM PDT	Severe Thunderstorm Warning	OTX	Ferry, Grant, Lincoln, Okanogan, Spokane, Stevens	43 min
Jul 20, 3:18 PM PDT	Areal Flood Advisory	OTX	Whitman	117 min
Jul 20, 3:20 PM PDT	Severe Thunderstorm Warning	OTX	Lincoln, Spokane, Whitman	40 min
Jul 20, 3:27 PM PDT	Severe Thunderstorm Warning	OTX	Douglas, Okanogan	34 min
Jul 20, 3:35 PM PDT	Areal Flood Warning	OTX	Pend Oreille	4 hr
Jul 20, 3:37 PM PDT	Severe Thunderstorm Warning	OTX	Pend Oreille	53 min
Jul 20, 3:47 PM PDT	Flash Flood Warning	OTX	Ferry, Okanogan	88 min
Jul 20, 4:22 PM PDT	Special Weather Statement	OTX	Ferry	38 min
Jul 20, 4:30 PM PDT	Severe Thunderstorm Warning	OTX	Ferry, Okanogan	30 min

Nearby

Flash Flood Warnings in Washington, 2012 Every flash flood warning in 2012

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.