Alert archive / Nebraska / Flash Flood Warnings in 2015

Flash Flood Warning 13, NWS Cheyenne, WY

June 25, 2015Dawes County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jun 25, 2015, 4:37 PM MDT for Dawes County, Nebraska. It was in force for 3 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: Jun 25, 2015, 4:37 PM MDT (22:37 UTC)
Expired: Jun 25, 2015, 7:30 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 168 km from the middle of the area, began a volume at 22:37 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

Rapid City, SD (KRAP), launched 12:00Z, 10.6 hours before the alert went out and 162 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: 404 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

763 
WGUS55 KCYS 252237
FFWCYS
NEC045-260130-
/O.NEW.KCYS.FF.W.0013.150625T2237Z-150626T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
437 PM MDT THU JUN 25 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 730 PM MDT
    
* AT 434 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN IN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHADRON CAMPGROUND...RED CLOUD CAMPGROUND AND CHADRON ST PARK. 

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4259 10277 4247 10341 4248 10345 4264 10347
      4279 10281 4278 10277

$$

CLAYCOMB

1 follow-up statement

286 
WGUS75 KCYS 260037
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
637 PM MDT THU JUN 25 2015

NEC045-260047-
/O.CAN.KCYS.FF.W.0013.000000T0000Z-150626T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAWES NE-
637 PM MDT THU JUN 25 2015

...THE FLASH FLOOD WARNING FOR SOUTHERN DAWES COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 4259 10277 4247 10341 4248 10345 4264 10347
      4279 10281 4278 10277

$$

CLAYCOMB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 10:33 AM MDT	Severe Thunderstorm Warning	CYS	Dawes	42 min
Jun 25, 11:18 AM MDT	Areal Flood Advisory	CYS	Dawes, Sioux	117 min
Jun 25, 11:58 AM MDT	Special Weather Statement	CYS	Dawes	47 min
Jun 25, 12:00 PM MDT	Special Weather Statement	CYS	Dawes	45 min
Jun 25, 12:22 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	38 min
Jun 25, 1:00 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	30 min
Jun 25, 3:34 PM MDT	Special Weather Statement	CYS	Banner	26 min
Jun 25, 4:06 PM MDT	Special Weather Statement	CYS	Dawes	39 min
Jun 25, 4:09 PM MDT	Special Weather Statement	CYS	Banner	51 min
Jun 25, 4:35 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	40 min
Jun 25, 4:51 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball, Morrill, Scotts Bluff	24 min
Jun 25, 4:58 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff	47 min
Jun 25, 5:05 PM MDT	Tornado Warning	CYS	Morrill, Scotts Bluff	40 min
Jun 25, 5:13 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Morrill	49 min
Jun 25, 5:44 PM MDT	Tornado Warning	CYS	Morrill	22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.