Alert archive / Nebraska / Flash Flood Warnings in 2017

Flash Flood Warning 1, NWS North Platte, NE

July 17, 2017Frontier County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 17, 2017, 6:02 PM CDT for Frontier County, Nebraska. It was in force for 3 hr. 1 report 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 17, 2017, 6:02 PM CDT (23:02 UTC)
Expired: Jul 17, 2017, 9:00 PM CDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Frontier County, NE

The radar

The Grand Island radar (KUEX), 142 km from the middle of the area, began a volume at 23:05 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 17, 8:46 PM CDT	FLOOD	9 W Eustis, NE	LAW ENFORCEMENT REPORTED WATER OVER ROAD 408 SOUTH OF FARNAM EARLIER THIS EVENING. CURRENTLY THERE IS NO LONGER WATER OVER THE ROAD, BUT IT HAS BEEN BARRICADED FOR THE NIGHT.

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

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.0 hours before the alert went out and 79 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: 180 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1585 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

136 
WGUS53 KLBF 172302
FFWLBF
NEC063-180200-
/O.NEW.KLBF.FF.W.0001.170717T2302Z-170718T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
602 PM CDT MON JUL 17 2017

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Eastern Frontier County in southwestern Nebraska...

* Until 900 PM CDT

* At 601 PM CDT, Doppler radar indicated heavy rain across the 
  warned area. one to 3 inches of rain has fallen. Flash flooding is 
  expected to begin shortly. 

* Some locations that will experience flooding include...
  Eustis, Medicine Creek Reservoir State Recreation Area and Orafino.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

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

&&

LAT...LON 4069 9998 4045 9999 4044 10010 4036 10010
      4035 10028 4070 10025

$$

Buttler

2 follow-up statements

603 
WGUS73 KLBF 180023
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
723 PM CDT MON JUL 17 2017

NEC063-180200-
/O.CON.KLBF.FF.W.0001.000000T0000Z-170718T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Frontier NE-
723 PM CDT MON JUL 17 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
EASTERN FRONTIER COUNTY...

At 722 PM CDT, Doppler radar indicated heavy rain across the warned 
area had ended. However, up to three inches of rain has fallen. 
Flash flooding is still a threat as runoff from heavy rain from 
earlier this evening is likely.

Some locations that will experience flooding include...
Eustis, Medicine Creek Reservoir State Recreation Area and Orafino. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

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

&&

LAT...LON 4069 9998 4045 9999 4044 10010 4036 10010
      4035 10028 4070 10025

$$

Buttler

186 
WGUS73 KLBF 180157
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
857 PM CDT MON JUL 17 2017

NEC063-180207-
/O.EXP.KLBF.FF.W.0001.000000T0000Z-170718T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Frontier NE-
857 PM CDT MON JUL 17 2017

...THE FLASH FLOOD WARNING FOR EASTERN FRONTIER COUNTY WILL EXPIRE AT
900 PM CDT...

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

LAT...LON 4069 9998 4045 9999 4044 10010 4036 10010
      4035 10028 4070 10025

$$

Buttler

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 2:44 PM CDT	Special Weather Statement	LBF	Custer	46 min
Jul 17, 2:58 PM CDT	Special Weather Statement	LBF	Custer	47 min
Jul 17, 3:30 PM CDT	Heat Advisory	LBF	Chase, Custer, Frontier, Hayes	26 hr
Jul 17, 3:57 PM CDT	Special Weather Statement	LBF	Frontier	48 min
Jul 17, 4:40 PM CDT	Areal Flood Advisory	LBF	Frontier	3 hr

Nearby

Flash Flood Warnings in Nebraska, 2017 Every flash flood warning in 2017

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.