Alert archive / Nebraska / Flash Flood Warnings in 2026

Flash Flood Warning 21, NWS Omaha, NE

June 11, 2026Fremont County, Mills County, Iowa; 5 counties in Nebraska

NWS Omaha, NE issued this flash flood warning at Jun 11, 2026, 5:23 AM CDT for Fremont County, Mills County, Iowa; 5 counties in Nebraska. It was in force for 3 hr. 1 report 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 11, 2026, 5:23 AM CDT (10:23 UTC)
Expired: Jun 11, 2026, 8:30 AM CDT
In force: 3 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Flood severity: None

Counties Fremont County, IA, Mills County, IA, Cass County, NE, Lancaster County, NE, Otoe County, NE, Sarpy County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 39 km from the middle of the area, began a volume at 10:26 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

Time	Report	Where	Remark
Jun 11, 7:00 AM CDT	RAIN 6	Sidney, IA	Public report of 6 inch of rain in Sidney, Iowa from morning thunderstorm.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 10.4 hours before the alert went out and 39 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: 90 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 2862 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

054 
WGUS53 KOAX 111023
FFWOAX
IAC071-129-NEC025-109-131-153-155-111330-
/O.NEW.KOAX.FF.W.0021.260611T1023Z-260611T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Omaha/Valley NE
523 AM CDT Thu Jun 11 2026

The National Weather Service in Omaha/Valley has issued a

* Flash Flood Warning for...
  Northwestern Fremont County in southwestern Iowa...
  Mills County in southwestern Iowa...
  Sarpy County in east central Nebraska...
  Southeastern Saunders County in east central Nebraska...
  Cass County in southeastern Nebraska...
  Northeastern Lancaster County in southeastern Nebraska...
  Northern Otoe County in southeastern Nebraska...

* Until 830 AM CDT.

* At 523 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 0.5 and 2 inches of rain
  have fallen. The expected rainfall rate is 1 to 2.5 inches in 1
  hour. 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 indicated.

  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...
  Bellevue, Papillion, Gretna, Offutt AFB, La Vista, Plattsmouth,
  Glenwood, Waverly, Ashland, Springfield, Malvern, Sidney,
  Louisville, Weeping Water, Tabor, Eagle, Ceresco, Elmwood,
  Greenwood and Pacific Junction.

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 4103 9674 4109 9658 4114 9636 4118 9623
      4118 9603 4116 9588 4116 9558 4088 9553
      4073 9566 4070 9603 4073 9659 4083 9655
      4091 9655 4100 9654

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2.5 INCHES IN 1 HOUR

$$

Petersen

2 follow-up statements

743 
WGUS73 KOAX 111157
FFSOAX

Flash Flood Statement
National Weather Service Omaha/Valley NE
657 AM CDT Thu Jun 11 2026

IAC071-129-NEC025-109-131-153-155-111330-
/O.CON.KOAX.FF.W.0021.000000T0000Z-260611T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont IA-Mills IA-Cass NE-Lancaster NE-Otoe NE-Sarpy NE-
Saunders NE-
657 AM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM CDT THIS
MORNING FOR NORTHWESTERN FREMONT, SOUTHWESTERN MILLS, SOUTHWESTERN
SARPY, SOUTHEASTERN SAUNDERS, CASS, NORTHEASTERN LANCASTER AND
NORTHERN OTOE COUNTIES...

At 657 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 3.5 inches of rain have
fallen. Flooding impacts will continue, but no additional rainfall is
expected. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

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 may experience flash flooding include...
  Plattsmouth, Waverly, Ashland, Malvern, Sidney, Louisville, Weeping
  Water, Tabor, Eagle, Elmwood, Greenwood, Murray, Cedar Creek,
  Avoca, Murdock, Union, Nehawka, Randolph, Beaver Lake and Thurman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4103 9674 4104 9646 4105 9631 4108 9619
      4104 9599 4104 9588 4095 9583 4099 9568
      4108 9557 4088 9553 4073 9566 4070 9603
      4080 9656 4083 9655 4091 9655 4100 9654

FLASH FLOOD...RADAR INDICATED

$$

Barjenbruch

978 
WGUS73 KOAX 111323
FFSOAX

Flash Flood Statement
National Weather Service Omaha/Valley NE
823 AM CDT Thu Jun 11 2026

IAC071-129-NEC025-109-131-153-155-111333-
/O.EXP.KOAX.FF.W.0021.000000T0000Z-260611T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont IA-Mills IA-Cass NE-Lancaster NE-Otoe NE-Sarpy NE-
Saunders NE-
823 AM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 830 AM CDT THIS MORNING FOR
NORTHWESTERN FREMONT, SOUTHWESTERN MILLS, SOUTHWESTERN SARPY,
SOUTHEASTERN SAUNDERS, CASS, NORTHEASTERN LANCASTER AND NORTHERN OTOE
COUNTIES...

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

&&

LAT...LON 4103 9674 4104 9646 4105 9631 4108 9619
      4104 9599 4104 9588 4095 9583 4099 9568
      4108 9557 4088 9553 4073 9566 4070 9603
      4080 9656 4083 9655 4091 9655 4100 9654

$$

Petersen

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 4:36 AM CDT	Severe Thunderstorm Warning	OAX	Fremont	39 min
Jun 11, 4:51 AM CDT	Severe Thunderstorm Warning	OAX	Fremont	54 min
Jun 11, 5:02 AM CDT	Severe Thunderstorm Warning	OAX	Page	43 min
Jun 11, 5:15 AM CDT	Tornado Warning	OAX	Fremont, Mills	45 min
Jun 11, 5:28 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Fremont, Mills, Montgomery, Page, Pottawattamie	47 min
Jun 11, 5:39 AM CDT	Tornado Warning	OAX	Fremont, Page	36 min
Jun 11, 5:39 AM CDT	Tornado Warning Tornado observed	OAX	Fremont, Mills, Montgomery, Page	36 min
Jun 11, 5:43 AM CDT	Tornado Warning	OAX	Mills, Montgomery, Pottawattamie	32 min
Jun 11, 5:46 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Harrison, Mills, Pottawattamie, Shelby	44 min
Jun 11, 5:49 AM CDT	Flash Flood Warning	OAX	Fremont, Mills, Montgomery, Page	3 hr
Jun 11, 5:52 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Fremont, Montgomery, Page, Pottawattamie	38 min
Jun 11, 6:00 AM CDT	Tornado Warning	OAX	Montgomery, Page	30 min
Jun 11, 6:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Montgomery, Page	20 min
Jun 11, 6:29 AM CDT	Flash Flood Warning	OAX	Fremont, Page	2 hr
Jun 11, 3:13 AM CDT	Severe Thunderstorm Warning	OAX	Butler, Lancaster, Saunders, Seward	47 min
Jun 11, 3:52 AM CDT	Severe Thunderstorm Warning	OAX	Butler, Cass, Lancaster, Saunders, Seward	38 min
Jun 11, 3:54 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	51 min
Jun 11, 3:57 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	48 min
Jun 11, 4:14 AM CDT	Flash Flood Warning	OAX	Lancaster, Seward	3 hr
Jun 11, 4:21 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	39 min
Jun 11, 4:40 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Gage, Lancaster, Otoe, Saline, Seward	50 min
Jun 11, 4:45 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	33 min
Jun 11, 4:53 AM CDT	Tornado Warning	OAX	Cass, Lancaster, Otoe	17 min
Jun 11, 5:00 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Lancaster, Otoe, Sarpy	45 min
Jun 11, 5:07 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Gage, Johnson, Lancaster, Nemaha, Otoe	38 min
Jun 11, 5:13 AM CDT	Severe Thunderstorm Warning Destructive damage threat	OAX	Cass, Otoe	47 min

Nearby

Flash Flood Warnings in Nebraska, 2026 Flash Flood Warnings in Iowa, 2026 Every flash flood warning in 2026

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.