Alert archive / Nebraska / Flash Flood Warnings in 2017

Flash Flood Warning 10, NWS North Platte, NE

August 15, 2017Custer County, Garfield County, Loup County, Nebraska

NWS North Platte, NE issued this flash flood warning at Aug 15, 2017, 5:55 PM CDT for Custer County, Garfield County, Loup County, Nebraska. It was in force for 6 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
Aug 15, 2017, 5:55 PM CDT (22:55 UTC)
Expired
Aug 16, 2017, 12:00 AM CDT
In force
6 hr
Issued by
NWS North Platte, NE
Area
Storm-based polygon
Flood severity
None

Counties Custer County, NE, Garfield County, NE, Loup County, NE

The radar

The North Platte radar (KLNX), 110 km from the middle of the area, began a volume at 22:58 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 15, 8:15 PM CDTFLASH FLOOD7 Nw Merna, NENEB. HWY 2 CLOSED DUE TO WATER RUNNING ACROSS THE ROAD
Aug 15, 10:00 PM CDTFLASH FLOODAnselmo, NESTREETS FLOODED IN TOWN, DITCHES ALONG HWY 2 COMPLETELY FULL
Aug 15, 10:00 PM CDTFLASH FLOODSargent, NESTREETS FLOODED IN TOWN

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, 10.9 hours before the alert went out and 129 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 12:00Z on 2017-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 418 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 12:00Z on 2017-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939Sfc1 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
418 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

589 
WGUS53 KLBF 152255
FFWLBF
NEC041-071-115-160500-
/O.NEW.KLBF.FF.W.0010.170815T2255Z-170816T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
555 PM CDT TUE AUG 15 2017

The National Weather Service in North Platte has issued a

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

* Until midnight CDT Wednesday

* At 554 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...
  Burwell, Taylor, Arnold, Sargent, Merna, Anselmo, Comstock,
  Victoria Springs State Recreation Area, Calamus Reservoir State
  Recreation Area, Weissert, Lillian, Walworth, Virginia Smith Dam,
  Kent Diversion Dam State Wildlife Management Area, Homestead Knolls
  Campground, Nunda Shoal Campground, Gables, Round Valley, Hannamon
  Bayou Campground and Arcadia Diversion Dam State Wildlife
  Management Area.

Additional rainfall amounts of 2 to 4 inches are possible in the 
warned area.

This includes the following highways...
 Highway 183 between mile markers 103 and 131.
 Highway 2 between mile markers 254 and 271.
 Highway 92 between mile markers 252 and 273.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4176 9878 4174 9882 4174 9921 4147 9922
      4143 10024 4163 10022 4171 9957 4203 9921
      4202 9876

$$

CDC
1 follow-up statement
068 
WGUS73 KLBF 160132
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
832 PM CDT TUE AUG 15 2017

NEC041-071-115-160500-
/O.CON.KLBF.FF.W.0010.000000T0000Z-170816T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Loup NE-Garfield NE-Custer NE-
832 PM CDT TUE AUG 15 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
SOUTHEASTERN LOUP...GARFIELD AND NORTHERN CUSTER COUNTIES...

At 810 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to three inches of rain have already
fallen. Flooding is already occuring in places.  

Some locations that will experience flooding include...
Burwell, Taylor, Arnold, Sargent, Merna, Anselmo, Comstock, Victoria
Springs State Recreation Area, Calamus Reservoir State Recreation
Area, Weissert, Lillian, Walworth, Virginia Smith Dam, Kent Diversion
Dam State Wildlife Management Area, Homestead Knolls Campground,
Nunda Shoal Campground, Gables, Round Valley, Hannamon Bayou
Campground and Arcadia Diversion Dam State Wildlife Management Area.

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

This includes the following highways...
 Highway 183 between mile markers 103 and 131.
 Highway 2 between mile markers 254 and 271.
 Highway 92 between mile markers 252 and 273.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4176 9878 4174 9882 4174 9921 4147 9922
      4143 10024 4163 10022 4171 9957 4203 9921
      4202 9876

$$

Taylor

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 9:17 PM CDTSpecial Weather StatementLBFSheridan28 min
Aug 14, 9:26 PM CDTSpecial Weather StatementLBFSheridan49 min
Aug 14, 9:31 PM CDTSevere Thunderstorm WarningLBFCherry, Sheridan44 min
Aug 14, 10:09 PM CDTSpecial Weather StatementLBFGrant66 min
Aug 14, 10:37 PM CDTSpecial Weather StatementLBFCherry, Grant38 min
Aug 14, 11:12 PM CDTSpecial Weather StatementLBFCherry, Hooker48 min
Aug 14, 11:58 PM CDTSpecial Weather StatementLBFCherry, Hooker47 min
Aug 15, 12:27 AM CDTSpecial Weather StatementLBFSheridan48 min
Aug 15, 3:53 AM CDTAreal Flood AdvisoryLBFHolt3 hr
Aug 15, 8:30 AM CDTSpecial Weather StatementLBFGarfield, Wheeler60 min
Aug 15, 11:12 AM CDTSpecial Weather StatementLBFGarfield63 min
Aug 15, 11:49 AM CDTSevere Thunderstorm WarningLBFGarfield, Holt41 min
Aug 15, 11:57 AM CDTSpecial Weather StatementLBFCuster48 min
Aug 15, 11:59 AM CDTSpecial Weather StatementLBFLincoln46 min
Aug 15, 12:06 PM CDTSevere Thunderstorm WarningLBFLincoln39 min
Aug 15, 12:28 PM CDTSevere Thunderstorm WarningLBFCuster, Loup47 min
Aug 15, 12:30 PM CDTSevere Thunderstorm WarningLBFHolt45 min
Aug 15, 12:36 PM CDTFlash Flood WarningLBFCuster6 hr
Aug 15, 12:39 PM CDTFlash Flood WarningLBFGarfield, Holt6 hr
Aug 15, 12:49 PM CDTSpecial Weather StatementLBFLogan41 min
Aug 15, 12:58 PM CDTSevere Thunderstorm WarningLBFCuster, Logan30 min
Aug 15, 2:08 PM CDTSpecial Weather StatementLBFGarfield52 min
Aug 15, 3:40 PM CDTSpecial Weather StatementLBFSherman50 min
Aug 15, 4:15 PM CDTSpecial Weather StatementLBFLoup, Rock60 min
Aug 15, 5:08 PM CDTSpecial Weather StatementLBFGarfield, Holt97 min
Aug 15, 5:31 PM CDTSevere Thunderstorm WarningLBFCuster, Garfield, Loup44 min
Aug 15, 5:43 PM CDTSpecial Weather StatementLBFCuster47 min
Aug 15, 6:13 PM CDTSevere Thunderstorm WarningLBFCuster47 min
Aug 15, 6:17 PM CDTSpecial Weather StatementLBFHolt43 min
Aug 15, 6:32 PM CDTFlash Flood WarningLBFLogan3 hr
Aug 15, 6:45 PM CDTSpecial Weather StatementLBFLogan45 min
Aug 15, 6:47 PM CDTSpecial Weather StatementLBFWheeler58 min
Aug 15, 6:51 PM CDTSpecial Weather StatementLBFArthur, Keith54 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.