Alert archive / Nebraska / Flash Flood Warnings in 2017

Flash Flood Warning 16, NWS North Platte, NE

October 1, 2017Custer County, Loup County, Nebraska

NWS North Platte, NE issued this flash flood warning at Oct 1, 2017, 7:43 PM CDT for Custer County, Loup County, Nebraska. It was in force for 6 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: Oct 1, 2017, 7:43 PM CDT (00:43 UTC)
Expired: Oct 2, 2017, 1:45 AM CDT
In force: 6 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

Counties Custer County, NE, Loup County, NE

The radar

The North Platte radar (KLNX), 81 km from the middle of the area, began a volume at 00:44 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
Oct 1, 10:30 PM CDT	FLASH FLOOD	1 W Gates, NE	A BRIDGE ALONG SARGENT ROAD WAS WASHED OUT ABOUT 1.5 MILES WEST OF GATES.

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 00:00Z, 0.7 hours before the alert went out and 95 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: 825 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1777 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted.

563 
WGUS53 KLBF 020043
FFWLBF
NEC041-115-020645-
/O.NEW.KLBF.FF.W.0016.171002T0043Z-171002T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
743 PM CDT SUN OCT 1 2017

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Southern Loup County in north central Nebraska...
  Northern Custer County in central Nebraska...

* Until 145 AM CDT Monday

* At 742 PM CDT, 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...
  Taylor, Sargent, Merna, Anselmo, Victoria Springs State Recreation
  Area, Lillian, Milburn, Round Valley, Walworth, Hannamon Bayou
  Campground, Milldale, Pleasant Hill, Almeria, Finchville and Gates.

Additional rainfall amounts of one to two inches are possible in the 
warned area.

This includes the following highways...
 Highway 183 between mile markers 119 and 134.
 Highway 2 between mile markers 255 and 273.
 Highway 92 between mile markers 251 and 273.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4160 9939 4132 9994 4133 10013 4148 10020
      4174 9978 4174 9969 4180 9968 4193 9948
      4192 9931

$$

Snively

2 follow-up statements

593 
WGUS73 KLBF 020401
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
1101 PM CDT SUN OCT 1 2017

NEC041-115-020645-
/O.CON.KLBF.FF.W.0016.000000T0000Z-171002T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Loup NE-Custer NE-
1101 PM CDT SUN OCT 1 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM CDT FOR
SOUTHERN LOUP AND NORTHERN CUSTER COUNTIES...

At 1057 PM CDT, emergency management reported a bridge out on 
Sargent Road about one and one half miles west of Gates. Flash 
flooding is occurring across portions of northern Custer County.

Some locations that may be impacted by flooding include... 
Taylor, Sargent, Merna, Anselmo, Victoria Springs State Recreation 
Area, Lillian, Milburn, Round Valley, Walworth, Hannamon Bayou 
Campground, Milldale, Pleasant Hill, Almeria, Finchville and Gates.

This includes the following highways...
 Highway 183 between mile markers 119 and 134.
 Highway 2 between mile markers 255 and 273.
 Highway 92 between mile markers 251 and 273.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4160 9939 4132 9994 4133 10013 4148 10020
      4174 9978 4174 9969 4180 9968 4193 9948
      4192 9931

$$

Snively

873 
WGUS73 KLBF 020641
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
141 AM CDT MON OCT 2 2017

NEC041-115-020650-
/O.EXP.KLBF.FF.W.0016.000000T0000Z-171002T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Loup NE-Custer NE-
141 AM CDT MON OCT 2 2017

...THE FLASH FLOOD WARNING FOR SOUTHERN LOUP AND NORTHERN CUSTER
COUNTIES WILL EXPIRE AT 145 AM CDT...

The heavy rain has ended across the warned area, which allows the 
warning to expire. Report any additional flooding to law 
enforcement. Please continue to heed any remaining road closures.

LAT...LON 4160 9939 4132 9994 4133 10013 4148 10020
      4174 9978 4174 9969 4180 9968 4193 9948
      4192 9931

$$

Snively

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 1, 7:15 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Garfield, Holt, Loup	45 min
Oct 1, 7:27 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes	14 min
Oct 1, 7:40 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Frontier, Lincoln	50 min
Oct 1, 7:56 PM CDT	Areal Flood Advisory	LBF	Frontier, Hayes, Lincoln	3 hr
Oct 1, 8:04 PM CDT	Areal Flood Advisory	LBF	Garfield, Holt, Loup	3 hr
Oct 1, 8:14 PM CDT	Severe Thunderstorm Warning	LBF	Holt	46 min
Oct 1, 8:28 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	32 min
Oct 1, 8:56 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	15 min
Oct 2, 10:04 AM CDT	Flash Flood Watch	LBF	Custer, Frontier, Hayes, Lincoln, Logan	17 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.