Alert archive / Nebraska / Flash Flood Warnings in 2016

Flash Flood Warning 3, NWS Cheyenne, WY

June 12, 2016Scotts Bluff County, Sioux County, Nebraska; Goshen County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 12, 2016, 5:38 PM MDT for Scotts Bluff County, Sioux County, Nebraska; Goshen County, Wyoming. It was in force for 3 hr. 4 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 12, 2016, 5:38 PM MDT (23:38 UTC)
Expired: Jun 12, 2016, 8:45 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 116 km from the middle of the area, began a volume at 23:40 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 12, 6:04 PM MDT	FLASH FLOOD	Torrington, WY	FLASH FLOODING REPORTED IN TORRINGTON. TREE DOWN ON CITY PARK RESTROOM WITH INDIVIDUALS TRAPPED INSIDE. FIRE/EMS ON SCENE.
Jun 12, 6:34 PM MDT	FLASH FLOOD	Torrington, WY	FLOODING OCCURRING IN TORRINGTON. REPORT RECEIVED VIA TWITTER.
Jun 12, 8:24 PM MDT	HEAVY RAIN 5	Torrington, WY	MEASURED IN 4 INCH PLASTIC NWS RAIN GAGE.
Jun 12, 8:45 PM MDT	FLASH FLOOD	Torrington, WY	TORRINGTON PUBLIC WORKS HAS ASKED RESIDENTS OF TORRINGTON NOT TO USE PUBLIC WATER FOR NEXT 2-3 HOURS DUE TO FLOODING.

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, 11.6 hours before the alert went out and 244 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: 29 J/kg
Mixed-layer CIN: -499 J/kg
Mixed-layer LCL: 1742 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: -32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

754 
WGUS55 KCYS 122338
FFWCYS
NEC157-165-WYC015-130245-
/O.NEW.KCYS.FF.W.0003.160612T2338Z-160613T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
538 PM MDT SUN JUN 12 2016

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...
  NORTHWESTERN SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA...
  EAST CENTRAL GOSHEN COUNTY IN SOUTHEASTERN WYOMING...

* UNTIL 845 PM MDT
    
* AT 538 PM MDT...THE PUBLIC REPORTED A THUNDERSTORM PRODUCING HEAVY
  RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  TORRINGTON...LINGLE...VETERAN...HUNTLEY AND HENRY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

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

&&

LAT...LON 4220 10405 4193 10405 4192 10439 4220 10439

$$

CLAYCOMB

1 follow-up statement

230 
WGUS75 KCYS 130246
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
846 PM MDT SUN JUN 12 2016

NEC157-165-WYC015-130256-
/O.EXP.KCYS.FF.W.0003.000000T0000Z-160613T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SIOUX NE-SCOTTS BLUFF NE-GOSHEN WY-
846 PM MDT SUN JUN 12 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN SIOUX...NORTHWESTERN
SCOTTS BLUFF AND EAST CENTRAL GOSHEN COUNTIES HAS EXPIRED...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES.

LAT...LON 4220 10405 4193 10405 4192 10439 4220 10439

$$

CLAYCOMB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 5:40 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	35 min
Jun 11, 7:26 PM MDT	Special Weather Statement	CYS	Niobrara	64 min
Jun 12, 1:08 PM MDT	Special Weather Statement	CYS	Laramie	52 min
Jun 12, 1:38 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jun 12, 1:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	45 min
Jun 12, 2:17 PM MDT	Severe Thunderstorm Warning	CYS	Platte	43 min
Jun 12, 2:34 PM MDT	Special Weather Statement	CYS	Laramie	41 min
Jun 12, 2:51 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	24 min
Jun 12, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	49 min
Jun 12, 3:19 PM MDT	Tornado Warning	CYS	Albany, Converse, Platte	26 min
Jun 12, 3:44 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	46 min
Jun 12, 3:46 PM MDT	Severe Thunderstorm Warning	CYS	Platte	13 min
Jun 12, 4:53 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	21 min

Nearby

Flash Flood Warnings in Nebraska, 2016 Flash Flood Warnings in Wyoming, 2016 Every flash flood warning in 2016

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.