Alert archive / Nebraska / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Cheyenne, WY

June 16, 2011Banner County, Cheyenne County, Kimball County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jun 16, 2011, 6:38 PM MDT for Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 6 hr. 2 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 16, 2011, 6:38 PM MDT (00:38 UTC)
Expired: Jun 17, 2011, 12:30 AM MDT
In force: 6 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Banner County, NE, Cheyenne County, NE, Kimball County, NE

The radar

The Cheyenne radar (KCYS), 148 km from the middle of the area, began a volume at 00:38 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 16, 7:30 PM MDT	FLASH FLOOD	3 E Sidney, NE	HIGHWAY 30 CLOSED AT MILE MARKER 63 EAST OF SIDNEY
Jun 16, 7:41 PM MDT	FLASH FLOOD	Sidney, NE

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

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.6 hours before the alert went out and 152 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: 4315 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 123 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.

493 
WGUS55 KCYS 170038
FFWCYS
NEC007-033-105-170630-
/O.NEW.KCYS.FF.W.0003.110617T0038Z-110617T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
638 PM MDT THU JUN 16 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...
  EASTERN KIMBALL COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHEASTERN BANNER COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 1230 AM MDT

* AT 635 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SLOW
  MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED    
  AREA. HIGHWAY 30 NEAR THE KIMBALL AND CHEYENNE COUNTY LINES. STATE 
  ROAD 30 AND COUNTY ROAD 26 ARE REPORTED UNDER WATER AND            
  IMPASSABLE. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SIDNEY...BROWNSON...COLTON...DALTON...DIX...GURLEY...LODGEPOLE...
  LORENZO...POTTER...SIDNEY AIRPORT AND SUNOL.

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.

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

&&

LAT...LON 4100 10262 4100 10355 4145 10358 4145 10337
      4143 10336 4144 10262 4110 10260

$$

CLAYCOMB

1 follow-up statement

571 
WGUS75 KCYS 170623
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1223 AM MDT FRI JUN 17 2011

NEC007-033-105-170638-
/O.EXP.KCYS.FF.W.0003.000000T0000Z-110617T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BANNER NE-CHEYENNE NE-KIMBALL NE-
1223 AM MDT FRI JUN 17 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN KIMBALL...
CHEYENNE AND SOUTHEASTERN BANNER COUNTIES WILL BE ALLOWED TO EXPIRE
AT 1230 AM MDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4100 10262 4100 10355 4145 10358 4145 10337
      4143 10336 4144 10262 4110 10260

$$

MSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 3:32 AM MDT	Areal Flood Warning	CYS	Banner, Scotts Bluff, Sioux	8 hr
Jun 17, 5:34 AM MDT	River Flood Warning	CYS	Scotts Bluff	5 days

Nearby

Flash Flood Warnings in Nebraska, 2011 Every flash flood warning in 2011

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.