Alert archive / Nebraska / Flash Flood Warnings in 2019

Flash Flood Warning 21, NWS Cheyenne, WY

July 26, 2019Cheyenne County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jul 26, 2019, 5:28 PM MDT for Cheyenne County, Nebraska. It was in force for 5 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: Jul 26, 2019, 5:28 PM MDT (23:28 UTC)
Expired: Jul 26, 2019, 9:58 PM MDT
In force: 5 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 180 km from the middle of the area, began a volume at 23:31 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
Jul 26, 5:40 PM MDT	FLASH FLOOD	Lodgepole, NE	WEBCAM AT LODGEPOLE SHOWING WATER RUNNING UNDER THE UNDERPASS. LOTS OF HAIL DRIFTS ALONG HIGHWAY 80.
Jul 26, 5:54 PM MDT	FLASH FLOOD	Lodgepole, NE	EMERGENCY MANAGER REPORTING WATER RUNNING ACROSS ROADS IN LODGEPOLE. NUMEROUS LIMBS DOWN IN TOWN. LOTS OF PEA SIZED HAIL.
Jul 26, 6:20 PM MDT	FLASH FLOOD	8 N Lodgepole, NE	SPOTTER REPORTS ROAD 145 NORTH OF INTERSECTION OF HIGHWAY 38 WASHED OUT WITH RUNNING WATER. ROUGHLY A 20 FOOT SWATH OF THE ROAD IS WASHED OUT.

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 12:00Z, 11.5 hours before the alert went out and 157 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: 2769 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

325 
WGUS55 KCYS 262328
FFWCYS
NEC033-270230-
/O.NEW.KCYS.FF.W.0021.190726T2328Z-190727T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
528 PM MDT Fri Jul 26 2019

The National Weather Service in Cheyenne has issued a

* Flash Flood Warning for...
  Eastern Cheyenne County in the Panhandle of Nebraska...

* Until 830 PM MDT.

* At 527 PM MDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Lodgepole and Sunol. 

Additional rainfall amounts of of up to 2 inches from a secondary 
storm training over the same area is possible in the warned area.

This includes Interstate 80 in Nebraska between mile markers 71 and
77.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report flooding to your local law enforcement agency when you
can do so safely.

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.

&&

LAT...LON 4101 10262 4101 10271 4142 10286 4143 10264
      4140 10263 4139 10261 4105 10261

$$

Claycomb

2 follow-up statements

425 
WGUS55 KCYS 270213
FFWCYS
NEC033-270430-
/O.EXT.KCYS.FF.W.0021.000000T0000Z-190727T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
813 PM MDT Fri Jul 26 2019

The National Weather Service in Cheyenne has extended the

* Flash Flood Warning for...
  Eastern Cheyenne County in the Panhandle of Nebraska...

* Until 1030 PM MDT.

* At 812 PM MDT, emergency management reported flooding continues 
  from recent heavy rain across the warned area. Up to three inches 
  of rain have already fallen. Flash flooding is already occurring.

* Some locations that will experience flooding include...
  Lodgepole and Sunol. 

Additional rainfall amounts of up to 1 inch are possible in the 
warned area.

This includes Interstate 80 in Nebraska between mile markers 71 and
77.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Please report flooding to your local law enforcement agency when you
can do so safely.

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.

&&

LAT...LON 4101 10262 4101 10271 4142 10286 4143 10264
      4140 10263 4139 10261 4105 10261

$$

Claycomb

161 
WGUS75 KCYS 270358
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
958 PM MDT Fri Jul 26 2019

NEC033-270407-
/O.CAN.KCYS.FF.W.0021.000000T0000Z-190727T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cheyenne NE-
958 PM MDT Fri Jul 26 2019

...THE FLASH FLOOD WARNING FOR EASTERN CHEYENNE COUNTY IS
CANCELLED...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 4101 10262 4101 10271 4142 10286 4143 10264
      4140 10263 4139 10261 4105 10261

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 4:15 PM MDT	Special Weather Statement	CYS	Cheyenne	30 min
Jul 26, 4:39 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	36 min
Jul 26, 5:08 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	37 min
Jul 26, 5:12 PM MDT	Special Weather Statement	CYS	Cheyenne	33 min

Nearby

Flash Flood Warnings in Nebraska, 2019 Every flash flood warning in 2019

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.