Alert archive / Nebraska / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Cheyenne, WY

April 26, 2012Box Butte County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Apr 26, 2012, 4:04 PM MDT for Box Butte County, Nebraska. It was in force for 6 hr. 3 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: Apr 26, 2012, 4:04 PM MDT (22:04 UTC)
Expired: Apr 26, 2012, 10:00 PM MDT
In force: 6 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Box Butte County, NE

The radar

The North Platte radar (KLNX), 194 km from the middle of the area, began a volume at 22:07 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.

What was reported inside it

Time	Report	Where	Remark
Apr 26, 5:17 PM MDT	FLASH FLOOD	9 N Alliance, NE	WATER RUNNING OVER HIGHWAY 87 AND HIGHWAY 2 NORTH OF ALLIANCE WITH WATER FILLING THE SURROUNDING DITCHES.
Apr 26, 6:13 PM MDT	FLASH FLOOD	6 N Alliance, NE	HIGHWAY 87 CLOSED DUE TO FLOODING FROM MILE MARKER 6 NORTH OF ALLIANCE TO MILE MARKER 16 NORTH OF ALLIANCE.
Apr 26, 8:39 PM MDT	HEAVY RAIN 3.8	2 W Berea, NE	3.8 INCHES OF RAIN WAS MEASURED 2W BEREA FROM SLOW MOVING STORM...WITH HAIL DRIFTS 6 INCHES DEEP. MOSTLY SMALL SIZED HAIL. ALSO...ESTIMATED RAINFALL OF 8 INCHES 2E BEREA WHERE FARM FIELD WAS COMPLETELY INUNDATED WITH WATER.

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 (KUNR), launched 12:00Z, 10.1 hours before the alert went out and 207 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: 974 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 196 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.

179 
WGUS55 KCYS 262204
FFWCYS
NEC013-270400-
/O.NEW.KCYS.FF.W.0001.120426T2204Z-120427T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
404 PM MDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 1000 PM MDT

* AT 401 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. ADDITIONAL THUNDERSTORMS WILL MOVE INTO THE AREA OVER 
  THE NEXT 2 HOURS...WITH ADDITIONAL HEAVY RAINFALL POSSIBLE NEAR    
  BEREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BEREA
  AND WILD HORSE BUTTE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA THIS EVENING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
CHEYENNE.

&&

LAT...LON 4216 10273 4209 10314 4229 10315 4236 10275

$$

MAZUR

2 follow-up statements

251 
WGUS75 KCYS 270225
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
825 PM MDT THU APR 26 2012

NEC013-270400-
/O.CON.KCYS.FF.W.0001.000000T0000Z-120427T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOX BUTTE NE-
825 PM MDT THU APR 26 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN BOX BUTTE COUNTY
UNTIL 1000 PM MDT...

AT 811 PM MDT...DOPPLER RADAR INDICATED THE MAIN AREA OF HEAVY RAIN 
HAS MOVED OFF TO THE NORTHEAST WITH LIGHT TO MODERATE RAIN MOVING IN 
FROM THE SOUTHWEST. THIS RAIN WILL FALL ON ALREADY RAIN SOAKED OR 
FLOODED AREAS AND WILL CONTINUE THE THREAT FOR FLOODING THROUGH 10 
PM.  

AT 613 PM MDT...LAW ENFORCEMENT REPORTED FLOODING ALONG HIGHWAY 87 
NORTH OF ALLIANCE...WITH THE HIGHWAY CLOSED BETWEEN MILE MARKER 6 
AND MILE MARKER 16 DUE TO THE HIGH WATERS. 

SOME OTHER LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BEREA 
AND WILD HORSE BUTTE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE QUARTER TO ONE HALF INCH ARE 
POSSIBLE IN THE WARNED AREA THIS EVENING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE.

&&

LAT...LON 4216 10273 4209 10314 4229 10315 4236 10275

$$

MAZUR

192 
WGUS75 KCYS 270400
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1000 PM MDT THU APR 26 2012

NEC013-270414-
/O.EXP.KCYS.FF.W.0001.000000T0000Z-120427T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOX BUTTE NE-
1000 PM MDT THU APR 26 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN BOX BUTTE
COUNTY WILL BE REISSUED THROUGH 2 AM MDT...

LAT...LON 4216 10273 4209 10314 4229 10315 4236 10275

$$

MAZUR

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 11:05 AM MDT	Wind Advisory	CYS	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	10 hr
Apr 26, 1:51 PM MDT	Special Weather Statement	CYS	Box Butte	54 min
Apr 26, 2:39 PM MDT	Wind Advisory	CYS	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	30 hr
Apr 26, 2:45 PM MDT	Special Weather Statement	CYS	Box Butte	60 min
Apr 26, 3:27 PM MDT	Special Weather Statement	CYS	Scotts Bluff	63 min
Apr 26, 3:50 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	40 min
Apr 26, 3:58 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	62 min
Apr 26, 4:30 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	18 min
Apr 26, 5:01 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	37 min
Apr 26, 5:02 PM MDT	Flash Flood Warning	CYS	Scotts Bluff	6 hr
Apr 26, 5:09 PM MDT	Special Weather Statement	CYS	Box Butte	66 min
Apr 26, 5:35 PM MDT	Special Weather Statement	CYS	Box Butte	25 min

Nearby

Flash Flood Warnings in Nebraska, 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.