Alert archive / Nebraska / Flash Flood Warnings in 2015

Flash Flood Warning 2, NWS Cheyenne, WY

June 2, 2015Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jun 2, 2015, 5:42 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 5 hr. 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: Jun 2, 2015, 5:42 PM MDT (23:42 UTC)
Expired: Jun 2, 2015, 10:45 PM MDT
In force: 5 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 192 km from the middle of the area, began a volume at 23:44 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
Jun 2, 6:25 PM MDT	FLASH FLOOD	26 S Chadron, NE	ROAD FLOODED. DITCHES RUNNING FULL OR OVER BANKS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.7 hours before the alert went out and 186 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: 95 J/kg
Mixed-layer CIN: -540 J/kg
Mixed-layer LCL: 1851 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 105 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, in the capitals the NWS used until 2016.

773 
WGUS55 KCYS 022342
FFWCYS
NEC013-045-030445-
/O.NEW.KCYS.FF.W.0002.150602T2342Z-150603T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
542 PM MDT TUE JUN 2 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHEASTERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 1045 PM MDT
    
* AT 540 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE 
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. THE 
  STORM HAS SHOWN SIGNS OF SLOWING DOWN OVER THE PAST 30 MINUTES.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  HEMINGFORD...WILD HORSE BUTTE...BOX BUTTE CAMPGROUND AND BOX BUTTE
  DAM.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO ONE AND A HALF INCHES 
ARE POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4228 10313 4254 10324 4257 10277 4245 10277
      4244 10275 4225 10275

$$

CLAYCOMB

1 follow-up statement

672 
WGUS75 KCYS 030136
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
736 PM MDT TUE JUN 2 2015

NEC013-045-030146-
/O.CAN.KCYS.FF.W.0002.000000T0000Z-150603T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOX BUTTE NE-DAWES NE-
736 PM MDT TUE JUN 2 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN BOX BUTTE AND
SOUTHEASTERN DAWES COUNTIES IS CANCELLED...

FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A
THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD
CLOSURES.

LAT...LON 4228 10313 4254 10324 4257 10277 4245 10277
      4244 10275 4225 10275

$$

CLAYCOMB

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 1, 6:19 PM MDT	Special Weather Statement	CYS	Cheyenne	41 min
Jun 1, 6:25 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	35 min
Jun 1, 7:00 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	30 min
Jun 2, 3:33 PM MDT	Special Weather Statement	CYS	Sioux	42 min
Jun 2, 3:47 PM MDT	Special Weather Statement	CYS	Sioux	43 min
Jun 2, 3:48 PM MDT	Special Weather Statement	CYS	Sioux	42 min
Jun 2, 3:56 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	47 min
Jun 2, 4:31 PM MDT	Special Weather Statement	CYS	Dawes	44 min
Jun 2, 4:36 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	54 min
Jun 2, 4:39 PM MDT	Areal Flood Advisory	CYS	Dawes, Sioux	3 hr
Jun 2, 4:56 PM MDT	Special Weather Statement	CYS	Dawes	49 min
Jun 2, 5:04 PM MDT	Special Weather Statement	CYS	Box Butte	41 min
Jun 2, 5:28 PM MDT	Special Weather Statement	CYS	Box Butte	47 min
Jun 2, 5:35 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	31 min

Nearby

Flash Flood Warnings in Nebraska, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.