Alert archive / Nebraska / Flash Flood Warnings in 2024

Flash Flood Warning 6, NWS North Platte, NE

June 20, 2024Brown County, Rock County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jun 20, 2024, 6:50 PM CDT for Brown County, Rock County, Nebraska. It was in force for 9 hr. 6 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: Jun 20, 2024, 6:50 PM CDT (23:50 UTC)
Expired: Jun 21, 2024, 4:00 AM CDT
In force: 9 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

Counties Brown County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 99 km from the middle of the area, began a volume at 23:54 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
Jun 20, 6:57 PM CDT	RAIN 5	3 S Ainsworth, NE
Jun 20, 7:35 PM CDT	FLASH FLOOD	Long Pine, NE	Reports of Conty roads washing out south of town. Bone Creek is out of the banks and water is nearing cabins near the creek.
Jun 20, 7:54 PM CDT	RAIN 0.82	Ainsworth, NE	Report of 0.82 inches of rainfall in 25 minutes.
Jun 20, 8:50 PM CDT	RAIN 4.2	6 Se Long Pine, NE	Storm total rainfall as of 8:50 PM CT.
Jun 20, 9:00 PM CDT	RAIN 4.2	6 Se Long Pine, NE
Jun 20, 9:31 PM CDT	FLASH FLOOD	Long Pine, NE	Washed out roads along Hidden Paradise area located on the southwest part of Long Pine. There was also a mudslide along a hillside in the Paradise area, with a tree down and some rocks in the road, dirt roadways washed out. Long Pine creek is bankfull. Richard

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this flash flood warning; the first came 45 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.8 hours before the alert went out and 174 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: 457 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 269 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

360 
WGUS53 KLBF 202350
FFWLBF
NEC017-149-210600-
/O.NEW.KLBF.FF.W.0006.240620T2350Z-240621T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
650 PM CDT Thu Jun 20 2024

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  East Central Brown County in north central Nebraska...
  Central Rock County in north central Nebraska...

* Until 100 AM CDT Friday.

* At 650 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Ainsworth, Bassett, Long Pine and Newport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4255 9994 4259 9983 4260 9952 4260 9950
      4261 9926 4242 9926 4242 9966 4242 9995

FLASH FLOOD...RADAR INDICATED

$$

Taylor

3 follow-up statements

066 
WGUS73 KLBF 210231
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
931 PM CDT Thu Jun 20 2024

NEC017-149-210600-
/O.CON.KLBF.FF.W.0006.000000T0000Z-240621T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Brown NE-Rock NE-
931 PM CDT Thu Jun 20 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM CDT FRIDAY FOR 
EAST CENTRAL BROWN AND CENTRAL ROCK COUNTIES...

At 931 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 3 and 7 inches of rain have 
fallen. The expected rainfall rate is 0.5 to 1 inch in 1 hour. 
Additional rainfall amounts up to 1 inch are possible in the warned 
area. Flash flooding is ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Ainsworth, Bassett, Long Pine and Newport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4255 9994 4259 9983 4260 9952 4260 9950
      4261 9926 4242 9926 4242 9966 4242 9995

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR AND 15 MINUTES

$$

Roberg

458 
WGUS53 KLBF 210443
FFWLBF
NEC017-149-210900-
/O.EXT.KLBF.FF.W.0006.000000T0000Z-240621T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
1143 PM CDT Thu Jun 20 2024

The National Weather Service in North Platte has extended the

* Flash Flood Warning for...
  East Central Brown County in north central Nebraska...
  Central Rock County in north central Nebraska...

* Until 400 AM CDT.

* At 1143 PM CDT, Gauge reports indicated between 3 and 7 inches of 
  rain have fallen. Additional rainfall amounts up to 0.5 inches are 
  possible in the warned area. Flash flooding is ongoing.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Gauges reported.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Ainsworth, Bassett, Long Pine and Newport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4255 9994 4259 9983 4260 9952 4260 9950
      4261 9926 4242 9926 4242 9966 4242 9995

FLASH FLOOD...GAUGE INDICATED

$$

Roberg

583 
WGUS73 KLBF 210857
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
357 AM CDT Fri Jun 21 2024

NEC017-149-210907-
/O.EXP.KLBF.FF.W.0006.000000T0000Z-240621T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Brown NE-Rock NE-
357 AM CDT Fri Jun 21 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 4 AM CDT EARLY THIS MORNING 
FOR EAST CENTRAL BROWN AND CENTRAL ROCK COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

A Flood Watch remains in effect until 700 AM CDT Saturday for a 
portion of north central Nebraska.

&&

LAT...LON 4255 9994 4259 9983 4260 9952 4260 9950
      4261 9926 4242 9926 4242 9966 4242 9995

$$

Buttler

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS North Platte, NE wrote its last area forecast discussion before this flash flood warning went out at Jun 20, 2:37 PM CDT, 4 hours 13 minutes earlier. Its key messages:

Thunderstorm chances, and the potential for severe thunderstorms and heavy rain, will be the focus both today and Friday.
Rain chances diminish this weekend with a return to warmer temperatures.
Above normal temperatures really take hold by Monday when far southwest Nebraska could approach 100F.

Area forecast discussion, Jun 20, 2:37 PM CDT, 4 hours 13 minutes before

Area Forecast Discussion
National Weather Service North Platte NE
237 PM CDT Thu Jun 20 2024

.KEY MESSAGES...

- Thunderstorm chances, and the potential for severe thunderstorms
  and heavy rain, will be the focus both today and Friday.

- Rain chances diminish this weekend with a return to warmer
  temperatures.

- Above normal temperatures really take hold by Monday when far
  southwest Nebraska could approach 100F.

&&

.SHORT TERM /THROUGH FRIDAY NIGHT/...
Issued at 233 PM CDT Thu Jun 20 2024

A warm front is lifting northward across western and north central
Nebraska this morning. By late this afternoon, it will extend
eastward along the NE/SD border from a deepening area of low
pressure across the Nebraska Panhandle. Scattered thunderstorms are
expected to develop mid-afternoon across eastern WY within a moist
up-slope environment. Initially, supercells will likely be the mode,
but storms should quickly organize into a line segment as it tracks
across the Panhandle into northwest Nebraska early this evening.
Strong winds appears to be the main threat though some hail could
accompany the stronger updrafts. Storms intensity should diminish by
late evening as they progress across north central Nebraska into
less favorable instability. Still, heavy rainfall may occur in this
area, as PWATS climb and exceed the 90th %tile as Gulf moisture
surges northward and the southerly LLJ increases. The better focus
may end up being north of the border in SD however, near the nose of
the LLJ.

Surface low pressure will develop southward into northeast CO during
the day Friday. A warm front will extend northeastward from the low
across southwest into north central Nebraska. This front will become
the focus for scattered afternoon thunderstorm development. The
overall shear profiles will be a little less than today, but still
favorable for storm organization. This will be especially true
across portions of far north central Nebraska where surface winds
will be locally backed. A few supercells will be possible early on,
especially near and just north of the warm front. Other higher based
more multicell type develop may occur across the Sandhills into
southwest Nebraska. The focus then becomes the potential for heavy
rainfall Friday night as the southerly LLJ once again increases.
Focus may again be more north in SD but will need to be monitored.
Cold front then crosses the area late Friday night into Saturday
morning. This will shift precipitation chances east of the area
Saturday into Saturday night.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
Issued at 233 PM CDT Thu Jun 20 2024

Ridging aloft takes hold across the southern plains into the desert
southwest from Sunday into most of next week. This puts our area
beneath west or northwest flow aloft. This is a warm and drier
pattern. In fact a very warm day is expected Monday when portions of
southwest Nebraska could see highs topping out in the lower 100s. A
weak cold front then settles south through the area Tuesday into
Wednesday bringing temperatures back to near average. Regarding
precipitation chances, as mentioned this looks to be a drier
pattern, but still may see some isolated thunderstorm develoment
which is common in a west-northwest flow aloft pattern.

&&

.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
Issued at 1234 PM CDT Thu Jun 20 2024

Cloud heights will lifts this afternoon with mainly VFR
conditions except across the far north where MVFR conditions
will be seen to include portions of the north central.
Convection will redevelop in the west this evening with a line
of showers and thunderstorms to move east around 35 mph. Short
term models are consistent in the line forming although eventual
radar will be telling with the main area of convection to focus
generally north of Interstate 80 this evening.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
None.

&&

SHORT TERM...Taylor
LONG TERM...Taylor
AVIATION...Keck

Hazardous weather outlook, Jun 20, 2:47 PM CDT, 4 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
247 PM CDT Thu Jun 20 2024

NEZ004>010-022>029-035>038-056>059-069>071-094-212000-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Grant-
Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-
Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
247 PM CDT Thu Jun 20 2024 /147 PM MDT Thu Jun 20 2024/

This Hazardous Weather Outlook is for portions of western and north
central Nebraska.

.DAY ONE...Tonight.

Thunderstorms are expected to develop east into the eastern Nebraska
Panhandle this evening with a line to move east northeast through
midnight. A slight risk for severe thunderstorm development continues tonight
across the eastern Nebraska Panhandle and northeast, north of a line
from Ogallala to Chappell and O'Neill. A marginal risk for
severe thunderstorms then extends south to a line near Imperial
northeast through Westerville. Main hazards tonight will be large
hail and damaging winds.

There is an excessive rainfall outlook across the north with the
greatest risk over much of Boyd County as thunderstorms redevelop
this evening and move east overnight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Strong to severe storms are possible, mainly Friday afternoon and
evening, mainly north of a line from Imperial to Ansley. Large hail
and damaging winds are the main threats. In addition, heavy rain is
possible over north central Nebraska.

Next week temperatures will again approach 100 degrees especially
over portions of far southwestern Nebraska on Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed in portions of the eastern
Panhandle and north tonight.

In the hours before

Special weather statement, Jun 20, 4:05 PM CDT, 2 hours 45 minutes before

Special Weather Statement
National Weather Service North Platte NE
405 PM CDT Thu Jun 20 2024

NEZ005-008-202145-
Brown NE-Eastern Cherry NE-
405 PM CDT Thu Jun 20 2024

...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL CHERRY AND CENTRAL
BROWN COUNTIES THROUGH 445 PM CDT...

At 405 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles west of Johnstown, or 21 miles west of Ainsworth, moving east
at 30 mph.

HAZARD...Wind gusts up to 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Ainsworth, Johnstown, Wood Lake, and Antelope Peak.

This includes Highway 20 between mile markers 222 and 246.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4240 10030 4255 10045 4276 9993 4248 9973
TIME...MOT...LOC 2105Z 250DEG 28KT 4253 10027

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

Roberg

Local storm report, Jun 20, 5:25 PM CDT, 1 hour 25 minutes before

Preliminary Local Storm Report
National Weather Service North Platte NE
525 PM CDT Thu Jun 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0424 PM     Hail             5.5 SW Johnstown        42.52N 100.13W
06/20/2024  M1.00 Inch       Brown              NE   Public

0510 PM     Hail             7 S Ainsworth           42.45N 99.86W
06/20/2024  M1.50 Inch       Brown              NE   Public

&&

Local storm report, Jun 20, 5:56 PM CDT, 54 minutes before

Preliminary Local Storm Report
National Weather Service North Platte NE
556 PM CDT Thu Jun 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0547 PM     Tornado          8 S Long Pine           42.42N 99.70W
06/20/2024                   Brown              NE   Fire Dept/Rescue

            Tornado confirmed on the ground by Fire
            Chief and was reported as rain wrapped.

&&

Local storm report, Jun 20, 6:37 PM CDT, 13 minutes before

Preliminary Local Storm Report
National Weather Service North Platte NE
637 PM CDT Thu Jun 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0632 PM     Tstm Wnd Gst     2 W Ellsworth           42.06N 102.32W
06/20/2024  M65 MPH          Sheridan           NE   CO-OP Observer

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 4:05 PM CDT	Special Weather Statement	LBF	Brown	40 min
Jun 20, 4:15 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry	45 min
Jun 20, 4:38 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Brown	52 min
Jun 20, 4:49 PM CDT	Tornado Warning	LBF	Brown	41 min
Jun 20, 5:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Brown, Rock	48 min
Jun 20, 5:29 PM CDT	Tornado Warning	LBF	Brown, Rock	46 min
Jun 20, 5:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Sheridan	53 min
Jun 20, 6:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Garden	68 min
Jun 20, 6:16 PM CDT	Tornado Warning	LBF	Rock	44 min
Jun 20, 6:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Cherry, Grant, Sheridan	55 min
Jun 20, 6:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Holt, Rock	48 min

Nearby

Flash Flood Warnings in Nebraska, 2024 Every flash flood warning in 2024

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.