Alert archive / Nebraska / Flash Flood Warnings in 2021

Flash Flood Warning 2, NWS North Platte, NE

May 22, 2021Frontier County, Nebraska

NWS North Platte, NE issued this flash flood warning at May 22, 2021, 5:31 PM CDT for Frontier County, Nebraska. It was in force for 3 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: May 22, 2021, 5:31 PM CDT (22:31 UTC)
Expired: May 22, 2021, 8:30 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 Goodland radar (KGLD), 154 km from the middle of the area, began a volume at 22:32 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 12:00Z, 10.5 hours before the alert went out and 74 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: 308 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 550 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

095 
WGUS53 KLBF 222231
FFWLBF
NEC063-230130-
/O.NEW.KLBF.FF.W.0002.210522T2231Z-210523T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
531 PM CDT Sat May 22 2021

The National Weather Service in North Platte has issued a

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

* Until 830 PM CDT.

* At 531 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 1 inch of rain has 
  fallen. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Curtis, Moorefield, Stockville, Medicine Creek Reservoir State 
  Recreation Area, Maywood, Dancing Leaf Earth Lodge, Freedom, 
  Quick, Bluegill Haven Campground, Willow View Campground, Red 
  Willow Reservoir State Recreation Area and Orafino.

This includes the following highways...
	Highway 83 between mile markers 27 and 51.

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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 4040 10077 4070 10076 4069 10023 4036 10021
      4036 10076 4036 10077

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS 

$$

CDC

2 follow-up statements

909 
WGUS73 KLBF 230010
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
710 PM CDT Sat May 22 2021

NEC063-230130-
/O.CON.KLBF.FF.W.0002.000000T0000Z-210523T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Frontier NE-
710 PM CDT Sat May 22 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS 
EVENING FOR WESTERN FRONTIER COUNTY...

At 710 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Doppler radar.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Curtis, Quick, Bluegill Haven Campground, Willow View Campground 
  and Red Willow Reservoir State Recreation Area.

This includes the following highways...
	Highway 83 between mile markers 28 and 45.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 4040 10077 4061 10070 4063 10041 4036 10043
      4036 10076 4036 10077

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25-1 INCH IN 6 HOURS 

$$

Jacobs

446 
WGUS73 KLBF 230135
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
835 PM CDT Sat May 22 2021

NEC063-230145-
/O.EXP.KLBF.FF.W.0002.000000T0000Z-210523T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Frontier NE-
835 PM CDT Sat May 22 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR WESTERN FRONTIER COUNTY...

The persistent heavy rain has ended. Additional isolated 
thunderstorms are possible through this evening. Flooding is no 
longer expected to pose a threat.

LAT...LON 4040 10077 4061 10070 4063 10041 4036 10043
      4036 10076 4036 10077

$$

Brown/Snively

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:28 PM CDT	Special Weather Statement	LBF	Sheridan	47 min
May 21, 9:04 PM CDT	Special Weather Statement	LBF	Sheridan	26 min
May 21, 9:27 PM CDT	Special Weather Statement	LBF	Sheridan	18 min
May 21, 10:25 PM CDT	Special Weather Statement	LBF	Garden	35 min
May 22, 12:37 AM CDT	Special Weather Statement	LBF	Deuel	38 min
May 22, 4:09 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Garden, Keith	51 min
May 22, 4:58 PM CDT	Special Weather Statement	LBF	Arthur, Garden	47 min
May 22, 5:16 PM CDT	Special Weather Statement	LBF	Thomas	44 min
May 22, 5:38 PM CDT	Special Weather Statement	LBF	Frontier	52 min
May 22, 6:06 PM CDT	Special Weather Statement	LBF	Arthur, Grant	39 min
May 22, 6:46 PM CDT	Special Weather Statement	LBF	Hooker	44 min

Nearby

Flash Flood Warnings in Nebraska, 2021 Every flash flood warning in 2021

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.