Alert archive / Nebraska / Flash Flood Warnings in 2017

Flash Flood Warning 3, NWS North Platte, NE

August 12, 2017Custer County, Nebraska

NWS North Platte, NE issued this flash flood warning at Aug 12, 2017, 9:24 PM CDT for Custer County, Nebraska. It was in force for 6 hr. 2 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
Aug 12, 2017, 9:24 PM CDT (02:24 UTC)
Expired
Aug 13, 2017, 3:30 AM CDT
In force
6 hr
Issued by
NWS North Platte, NE
Area
Storm-based polygon
Flood severity
None

County Custer County, NE

The radar

The North Platte radar (KLNX), 114 km from the middle of the area, began a volume at 02:26 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.

What was reported inside it

TimeReportWhereRemark
Aug 12, 9:25 PM CDTFLASH FLOODAnselmo, NEUP TO 3 INCHES OF RAIN HAS FALLEN WITH ROADS AND YARDS COVERED WITH WATER.
Aug 13, 12:55 AM CDTFLASH FLOODAnselmo, NEWEST SIDE OF ANSELMO NE HAS WATER OVER ROADS AND PUMPS RUNNING.

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, 2.4 hours before the alert went out and 92 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2017-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 815 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2017-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

887 
WGUS53 KLBF 130224
FFWLBF
NEC041-130830-
/O.NEW.KLBF.FF.W.0003.170813T0224Z-170813T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Eastern Custer County in central Nebraska...

* Until 330 AM CDT Sunday

* At 923 PM CDT, emergency management reported heavy rain across the
  warned area. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Broken Bow, Ansley, Merna, Mason City, Anselmo, Berwyn, Victoria
  Springs State Recreation Area, Weissert, Westerville, Lillian,
  Round Valley, Walworth, Burr Oak, Gavin Siding, Intersection of
  Highway 183 and Cumro Road, Buckeye, Block Hill Basin, Gates and
  Cumro.

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

This includes the following highways...
 Highway 183 between mile markers 73 and 104.
 Highway 2 between mile markers 253 and 307.
 Highway 92 between mile markers 269 and 308.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4105 9959 4168 9998 4174 9958 4126 9920
      4105 9921

$$

Snively/Kulik
2 follow-up statements
654 
WGUS73 KLBF 130538
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
1238 AM CDT SUN AUG 13 2017

NEC041-130830-
/O.CON.KLBF.FF.W.0003.000000T0000Z-170813T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Custer NE-
1238 AM CDT SUN AUG 13 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT FOR
EASTERN CUSTER COUNTY...

At 1235 AM CDT, emergency management reported flash flooding from 
Anselmo to Ansley. Three to five inches of rain have already fallen. 
Flash flooding is already occurring.

* Some locations that will experience flooding include...
  Broken Bow, Ansley, Merna, Mason City, Anselmo, Berwyn, Victoria
  Springs State Recreation Area, Weissert, Westerville, Lillian,
  Round Valley, Walworth, Burr Oak, Gavin Siding, Intersection of
  Highway 183 and Cumro Road, Buckeye, Block Hill Basin, Gates and
  Cumro.

Little to no additional rainfall is expected in the warned area.

This includes the following highways...
 Highway 183 between mile markers 73 and 104.
 Highway 2 between mile markers 253 and 307.
 Highway 92 between mile markers 269 and 308.

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 4105 9959 4168 9998 4174 9958 4126 9920
      4105 9921

$$

Kulik
242 
WGUS73 KLBF 130822
FFSLBF

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

NEC041-130831-
/O.EXP.KLBF.FF.W.0003.000000T0000Z-170813T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Custer NE-
322 AM CDT SUN AUG 13 2017

...THE FLASH FLOOD WARNING FOR EASTERN CUSTER COUNTY WILL EXPIRE AT
330 AM 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 4105 9959 4168 9998 4174 9958 4126 9920
      4105 9921

$$

Kulik

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:00 PM CDTSevere Thunderstorm WarningLBFBrown45 min
Aug 12, 7:05 PM CDTTornado WarningLBFCuster25 min
Aug 12, 7:14 PM CDTSevere Thunderstorm WarningLBFLoup, Rock31 min
Aug 12, 7:23 PM CDTSpecial Weather StatementLBFKeith, Lincoln52 min
Aug 12, 7:25 PM CDTSevere Thunderstorm WarningLBFCuster50 min
Aug 12, 7:40 PM CDTSevere Thunderstorm WarningLBFBlaine, Brown50 min
Aug 12, 7:44 PM CDTTornado WarningLBFPerkins17 min
Aug 12, 7:52 PM CDTSpecial Weather StatementLBFHayes53 min
Aug 12, 8:06 PM CDTSevere Thunderstorm WarningLBFCuster39 min
Aug 12, 8:08 PM CDTSevere Thunderstorm WarningLBFLincoln52 min
Aug 12, 8:13 PM CDTAreal Flood AdvisoryLBFLincoln2 hr
Aug 12, 8:15 PM CDTAreal Flood AdvisoryLBFCuster2 hr
Aug 12, 8:18 PM CDTSpecial Weather StatementLBFLoup42 min
Aug 12, 8:23 PM CDTFlash Flood WarningLBFHayes6 hr
Aug 12, 8:30 PM CDTAreal Flood AdvisoryLBFCuster2 hr
Aug 12, 8:37 PM CDTAreal Flood AdvisoryLBFCuster113 min
Aug 12, 8:41 PM CDTSevere Thunderstorm WarningLBFCuster49 min
Aug 12, 8:50 PM CDTSpecial Weather StatementLBFLoup40 min
Aug 12, 8:53 PM CDTSpecial Weather StatementLBFLincoln52 min
Aug 12, 9:08 PM CDTSevere Thunderstorm WarningLBFCuster39 min
Aug 12, 9:19 PM CDTSevere Thunderstorm WarningLBFBlaine, Custer, Loup41 min
Aug 13, 7:09 AM CDTDense Fog AdvisoryLBFChase, Deuel, Frontier, Hayes, Keith, Lincoln and 1 more3 hr
Aug 13, 4:17 PM CDTSpecial Weather StatementLBFBlaine43 min
Aug 13, 4:33 PM CDTSevere Thunderstorm WarningLBFBlaine, Custer42 min
Aug 13, 4:37 PM CDTSpecial Weather StatementLBFLogan38 min
Aug 13, 4:56 PM CDTSevere Thunderstorm WarningLBFCuster49 min
Aug 13, 4:58 PM CDTSevere Thunderstorm WarningLBFBlaine, Loup47 min
Aug 13, 5:02 PM CDTFlash Flood WarningLBFCuster6 hr
Aug 13, 5:28 PM CDTSpecial Weather StatementLBFPerkins47 min
Aug 13, 5:37 PM CDTSpecial Weather StatementLBFLogan38 min
Aug 13, 5:40 PM CDTSpecial Weather StatementLBFLoup50 min
Aug 13, 5:43 PM CDTSevere Thunderstorm WarningLBFCuster47 min
Aug 13, 5:56 PM CDTSpecial Weather StatementLBFLoup49 min
Aug 13, 6:02 PM CDTSpecial Weather StatementLBFLogan43 min
Aug 13, 6:23 PM CDTSevere Thunderstorm WarningLBFCuster52 min
Aug 13, 6:26 PM CDTSpecial Weather StatementLBFLoup49 min
Aug 13, 6:30 PM CDTSevere Thunderstorm WarningLBFCuster45 min
Aug 13, 6:32 PM CDTFlash Flood WarningLBFCuster8 hr
Aug 13, 6:39 PM CDTSevere Thunderstorm WarningLBFCuster51 min
Aug 13, 6:44 PM CDTSevere Thunderstorm WarningLBFBlaine, Loup46 min
Aug 13, 6:49 PM CDTSpecial Weather StatementLBFBoyd41 min

Nearby

Flash Flood Warnings in Nebraska, 2017Every 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.