Alert archive / Nebraska / Flash Flood Warnings in 2017

Flash Flood Warning 2, NWS North Platte, NE

August 12, 2017Hayes County, Nebraska

NWS North Platte, NE issued this flash flood warning at Aug 12, 2017, 8:23 PM CDT for Hayes County, Nebraska. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 12, 2017, 8:23 PM CDT (01:23 UTC)
Expired: Aug 13, 2017, 2:30 AM CDT
In force: 6 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Hayes County, NE

The radar

The Goodland radar (KGLD), 134 km from the middle of the area, began a volume at 01:26 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.4 hours before the alert went out and 84 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: 815 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

As transmitted.

863 
WGUS53 KLBF 130123
FFWLBF
NEC085-130730-
/O.NEW.KLBF.FF.W.0002.170813T0123Z-170813T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
823 PM CDT SAT AUG 12 2017

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Southern Hayes County in southwestern Nebraska...

* Until 230 AM CDT Sunday

* At 822 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Hayes Center and Hamlet. 

Additional rainfall amounts of 1 inch is possible in the warned area.

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 4056 10133 4055 10079 4041 10078 4035 10078
      4035 10134

$$

CDC

2 follow-up statements

302 
WGUS73 KLBF 130543
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
1243 AM CDT SUN AUG 13 2017

NEC085-130730-
/O.CON.KLBF.FF.W.0002.000000T0000Z-170813T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hayes NE-
1243 AM CDT SUN AUG 13 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM CDT FOR
SOUTHERN HAYES COUNTY...

At 1240 AM CDT, Doppler radar reported heavy rainfall and flash 
flooding across southern Hayes county. 

Some locations that will experience flooding include...
Hayes Center and Hamlet. 

Little to no additional rainfall is expected 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 4056 10133 4055 10079 4041 10078 4035 10078
      4035 10134

$$

Kulik

405 
WGUS73 KLBF 130723
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
223 AM CDT SUN AUG 13 2017

NEC085-130731-
/O.EXP.KLBF.FF.W.0002.000000T0000Z-170813T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hayes NE-
223 AM CDT SUN AUG 13 2017

...THE FLASH FLOOD WARNING FOR SOUTHERN HAYES COUNTY WILL EXPIRE AT
230 AM CDT...

Flooding is no longer expected to pose a threat. Please continue to 
heed any remaining road closures.

LAT...LON 4056 10133 4055 10079 4041 10078 4035 10078
      4035 10134

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Brown	45 min
Aug 12, 7:05 PM CDT	Tornado Warning	LBF	Custer	25 min
Aug 12, 7:14 PM CDT	Severe Thunderstorm Warning	LBF	Loup, Rock	31 min
Aug 12, 7:23 PM CDT	Special Weather Statement	LBF	Keith, Lincoln	52 min
Aug 12, 7:25 PM CDT	Severe Thunderstorm Warning	LBF	Custer	50 min
Aug 12, 7:40 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Brown	50 min
Aug 12, 7:44 PM CDT	Tornado Warning	LBF	Perkins	17 min
Aug 12, 7:52 PM CDT	Special Weather Statement	LBF	Hayes	53 min
Aug 12, 8:06 PM CDT	Severe Thunderstorm Warning	LBF	Custer	39 min
Aug 12, 8:08 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	52 min
Aug 12, 8:13 PM CDT	Areal Flood Advisory	LBF	Lincoln	2 hr
Aug 12, 8:15 PM CDT	Areal Flood Advisory	LBF	Custer	2 hr
Aug 12, 8:18 PM CDT	Special Weather Statement	LBF	Loup	42 min
Aug 12, 8:30 PM CDT	Areal Flood Advisory	LBF	Custer	2 hr
Aug 12, 8:37 PM CDT	Areal Flood Advisory	LBF	Custer	113 min
Aug 12, 8:41 PM CDT	Severe Thunderstorm Warning	LBF	Custer	49 min
Aug 12, 8:50 PM CDT	Special Weather Statement	LBF	Loup	40 min
Aug 12, 8:53 PM CDT	Special Weather Statement	LBF	Lincoln	52 min
Aug 12, 9:08 PM CDT	Severe Thunderstorm Warning	LBF	Custer	39 min
Aug 12, 9:19 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer, Loup	41 min
Aug 12, 9:24 PM CDT	Flash Flood Warning	LBF	Custer	6 hr
Aug 13, 7:09 AM CDT	Dense Fog Advisory	LBF	Chase, Deuel, Frontier, Hayes, Keith, Lincoln and 1 more	3 hr
Aug 13, 4:17 PM CDT	Special Weather Statement	LBF	Blaine	43 min
Aug 13, 4:33 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	42 min
Aug 13, 4:37 PM CDT	Special Weather Statement	LBF	Logan	38 min
Aug 13, 4:56 PM CDT	Severe Thunderstorm Warning	LBF	Custer	49 min
Aug 13, 4:58 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Loup	47 min
Aug 13, 5:02 PM CDT	Flash Flood Warning	LBF	Custer	6 hr
Aug 13, 5:28 PM CDT	Special Weather Statement	LBF	Perkins	47 min
Aug 13, 5:37 PM CDT	Special Weather Statement	LBF	Logan	38 min
Aug 13, 5:40 PM CDT	Special Weather Statement	LBF	Loup	50 min
Aug 13, 5:43 PM CDT	Severe Thunderstorm Warning	LBF	Custer	47 min
Aug 13, 5:56 PM CDT	Special Weather Statement	LBF	Loup	49 min
Aug 13, 6:02 PM CDT	Special Weather Statement	LBF	Logan	43 min
Aug 13, 6:23 PM CDT	Severe Thunderstorm Warning	LBF	Custer	52 min
Aug 13, 6:26 PM CDT	Special Weather Statement	LBF	Loup	49 min
Aug 13, 6:30 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
Aug 13, 6:32 PM CDT	Flash Flood Warning	LBF	Custer	8 hr
Aug 13, 6:39 PM CDT	Severe Thunderstorm Warning	LBF	Custer	51 min
Aug 13, 6:44 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Loup	46 min
Aug 13, 6:49 PM CDT	Special Weather Statement	LBF	Boyd	41 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.