Alert archive / Nebraska / Red Flag Warnings in 2026

Red Flag Warning 13, NWS Omaha, NE

April 17, 202618 counties in Nebraska; Monona County, Iowa

NWS Omaha, NE issued this red flag warning at Apr 17, 2026, 12:22 PM CDT for 18 counties in Nebraska; Monona County, Iowa. It took effect at Apr 18, 2026, 12:00 PM CDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 17, 2026, 12:22 PM CDT (17:22 UTC)
In effect from
Apr 18, 2026, 12:00 PM CDT
Expired
Apr 18, 2026, 8:00 PM CDT
In force
8 hr
Issued by
NWS Omaha, NE

Counties Monona County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 84 km from the middle of the area, began a volume at 17:21 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

Topeka, KS (KTOP), launched 12:00Z, 5.4 hours before the alert went out and 339 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, Topeka, KS at 12:00Z on 2026-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2338 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2026-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 379 square meters per square second.19395878Sfc1 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
2338 J/kg
Mixed-layer CIN
-172 J/kg
Mixed-layer LCL
934 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
379 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.8
Supercell composite
16.5

Open this sounding in Storm Lab

The text

As transmitted.

845 
WWUS83 KOAX 171722
RFWOAX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Omaha/Valley NE
1222 PM CDT Fri Apr 17 2026

IAZ043-NEZ011-012-015>018-030>034-042>045-050-051-065-180130-
/O.NEW.KOAX.FW.W.0013.260418T1700Z-260419T0100Z/
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Seward-
1222 PM CDT Fri Apr 17 2026

...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM CDT SATURDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR PARTS OF EASTERN NEBRASKA AND
WESTERN IOWA...

The National Weather Service in Omaha/Valley has issued a Red
Flag Warning for wind and low relative humidity, which is in
effect from noon to 8 PM CDT Saturday.

* AFFECTED AREA...Knox, Cedar, Thurston, Antelope, Pierce, 
  Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Monona, 
  Colfax, Dodge, Washington, Butler, Saunders, and Seward 
  Counties.

* TIMING...From noon to 8 PM CDT Saturday.

* WINDS...Northwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 18 percent.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity and warm temperatures can
contribute to extreme fire behavior.

&&

$$
4 follow-up statements
427 
WWUS83 KOAX 180429
RFWOAX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Omaha/Valley NE
1129 PM CDT Fri Apr 17 2026

IAZ043-NEZ011-012-015>018-030>034-042>045-050-051-065-190100-
/O.CON.KOAX.FW.W.0013.260418T1700Z-260419T0100Z/
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Seward-
1129 PM CDT Fri Apr 17 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM CDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR PARTS OF NORTHEASTERN
NEBRASKA INTO WESTERN IOWA...

* AFFECTED AREA...Knox, Cedar, Thurston, Antelope, Pierce, 
  Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Monona, 
  Colfax, Dodge, Washington, Butler, Saunders, and Seward 
  Counties.

* TIMING...From noon to 8 PM CDT Saturday.

* WINDS...Northwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 16 percent.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity and warm temperatures can
contribute to extreme fire behavior.

&&

$$
104 
WWUS83 KOAX 180733
RFWOAX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Omaha/Valley NE
233 AM CDT Sat Apr 18 2026

IAZ043-NEZ011-012-015>018-030>034-042>045-050-051-065-181545-
/O.CON.KOAX.FW.W.0013.260418T1700Z-260419T0100Z/
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Seward-
233 AM CDT Sat Apr 18 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PARTS OF
NORTHEASTERN NEBRASKA INTO WESTERN IOWA...

* AFFECTED AREA...Knox, Cedar, Thurston, Antelope, Pierce, 
  Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Monona, 
  Colfax, Dodge, Washington, Butler, Saunders, and Seward 
  Counties.

* TIMING...From noon today to 8 PM CDT this evening.

* WINDS...Northwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 15 percent.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity and warm temperatures can
contribute to extreme fire behavior.

&&

$$
048 
WWUS83 KOAX 181742
RFWOAX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Omaha/Valley NE
1242 PM CDT Sat Apr 18 2026

IAZ043-NEZ011-012-015>018-030>034-042>045-050-051-065-190100-
/O.CON.KOAX.FW.W.0013.000000T0000Z-260419T0100Z/
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Seward-
1242 PM CDT Sat Apr 18 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST NEBRASKA, AND
PORTIONS OF EAST CENTRAL NEBRASKA AND WEST CENTRAL IOWA...

* AFFECTED AREA...Knox, Cedar, Thurston, Antelope, Pierce, 
  Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Monona, 
  Colfax, Dodge, Washington, Butler, Saunders, and Seward 
  Counties.

* TIMING...Until 8 PM CDT this evening.

* WINDS...Northwest 20 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 16 percent.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity and warm temperatures can
contribute to extreme fire behavior.

&&

$$
051 
WWUS83 KOAX 190059
RFWOAX

URGENT - FIRE WEATHER MESSAGE
National Weather Service Omaha/Valley NE
759 PM CDT Sat Apr 18 2026

IAZ043-NEZ011-012-015>018-030>034-042>045-050-051-065-190200-
/O.EXP.KOAX.FW.W.0013.000000T0000Z-260419T0100Z/
Monona-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Seward-
759 PM CDT Sat Apr 18 2026

...RED FLAG WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR NORTHEAST NEBRASKA, AND PORTIONS OF
EAST CENTRAL NEBRASKA AND WEST CENTRAL IOWA...

Winds speeds have decreased this evening and will become
relatively light after sunset. While it remains dry, relative 
humidity will gradually increase through the overnight hours. With
the overall fire danger decreasing as conditions improve, the Red
Flag Warning will be allowed to expire.

$$

What forecasters said that day

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

NWS Omaha, NE wrote its last area forecast discussion before this red flag warning went out at Apr 17, 12:11 PM CDT, 11 minutes earlier. Its key messages:

  • There is a low chance of strong to severe thunderstorms on Friday, especially for southeast Nebraska and southwest Iowa. All severe weather hazards will be possible with any severe thunderstorms.
  • Cooler air arrives behind a cold front on Friday. Saturday and Sunday morning low temperatures will dip below freezing for many locations. Damage to sensitive outdoor vegetation will be possible.
  • A gradual warming trend begins on Sunday. Relatively warm, dry, and quiet weather will accompany this until our next potential weather system by the middle of next week.
Area forecast discussion, Apr 17, 12:11 PM CDT, 11 minutes before
Area Forecast Discussion
National Weather Service Omaha/Valley NE
1211 PM CDT Fri Apr 17 2026

.KEY MESSAGES...

- There is a low chance of strong to severe thunderstorms on
  Friday, especially for southeast Nebraska and southwest Iowa.
  All severe weather hazards will be possible with any severe
  thunderstorms.

- Cooler air arrives behind a cold front on Friday. Saturday
  and Sunday morning low temperatures will dip below freezing
  for many locations. Damage to sensitive outdoor vegetation
  will be possible.

- A gradual warming trend begins on Sunday. Relatively warm,
  dry, and quiet weather will accompany this until our next
  potential weather system by the middle of next week.

&&

.DISCUSSION...
Issued at 1103 PM CDT Thu Apr 16 2026

After a warm, dry, and windy afternoon on Thursday, rapid
moisture return has begun. Dewpoints are already beginning to
climb into the 50s and 60s across portions of the area late
this evening. This is in response to lee troughing and a strong
40 to 50 kt low-level jet ahead of an approaching trough. This
trough is expected to be progressive as it ejects into the
Great Plains tonight. A surface low pressure system is expected
to rapidly develop to the west and move into our area by Friday
morning. A strong cold front will follow this low pressure,
pushing a cooler airmass into the region. Latest high-resolution
forecast guidance has continued the trend of a faster front. In
this event, the cold front will clear all but southeast
Nebraska and southwest Iowa by early afternoon. This in turn
lowers the risk of severe weather for our area. Showers and
thunderstorms are still aniticpated near the front by early
afternoon, but these will quickly exit to the south and east. If
any severe thunderstorms can strengthen enough prior to this,
all severe hazards will be possible. Elsewhere, cooler and drier
weather gradually filters in behind the front. Temperatures by
Friday afternoon will range from the low 50s across portions of
northeast Nebraska to the low 80s over southeast Nebraska and
southwest Iowa due to the timing of the front. Temperatures will
plummet after sunset as cold air advection continues to
decrease temperatures heading into Friday night.

By this weekend, the much colder airmass really sets in.
Saturday morning temperatures in the 30s are expected with
below freezing temperatures for portions of northeast Nebraska.
As surface high pressure starts to build in, temperatures may
only reach the 50s by Saturday afternoon. The coldest temperatures
arrive Sunday morning. This is anticipated due to light winds
and clear skies. Sunday morning temperatures are forecast to
drop below freezing for many across the area, except portions of
southeast Nebraska and southwest Iowa. Thankfully, the surface
high pressure moves to our east by Sunday afternoon allowing for
the beginning of a warming trend. With the cold temperatures
during the morning this weekend, damage to sensitive outdoor
plants may be possible.

The first half of next week is marked by warm, dry, and quiet
weather across the region. Temperatures climb into the 70s to
near 80 across the area by Monday. Due to upper-level ridging,
the overall weather pattern is not expected to change until at
least the middle of next week. At this time, our next trough
will begin to approach the region by Wednesday. Thunderstorm
chances are expected to return with this system and another
cooldown is likely to follow late next week.

&&

.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1203 PM CDT Fri Apr 17 2026

A strong cold front has swept through the region bringing gusty
northwest winds. Expect winds to continue to gust up to 25-35
kts through the afternoon, before gradually diminishing this
evening. Speeds should dip to 12 kts or below by around 06Z
tonight, before increasing again shortly after 12Z Saturday
morning. VFR conditions are expected to prevail through the
majority of the period, however patchy MVFR ceilings may be
possible at KOFK for the next few hours.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...Red Flag Warning from noon to 8 PM CDT Saturday for NEZ011-012-
     015>018-030>034-042>045-050-051-065.
     Freeze Warning from 1 AM to 9 AM CDT Saturday for NEZ030-
     042>044-050-051-065-078-088.
IA...Red Flag Warning from noon to 8 PM CDT Saturday for IAZ043.

&&

DISCUSSION...Chehak
AVIATION...KG
Hazardous weather outlook, Apr 17, 4:58 AM CDT, 7 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
458 AM CDT Fri Apr 17 2026

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-181000-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-Page-
Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-Stanton-
Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-Saunders-Douglas-
Sarpy-Seward-Lancaster-Cass-Otoe-Saline-Jefferson-Gage-Johnson-
Nemaha-Pawnee-Richardson-
458 AM CDT Fri Apr 17 2026

This Hazardous Weather Outlook is for southwest Iowa, west central
Iowa, east central Nebraska, northeast Nebraska and southeast
Nebraska.

.DAY ONE...Today and tonight.

There is a low chance of strong to severe storms Friday afternoon
across southeast Nebraska and southwest Iowa, though higher chances
of severe weather should remain off to our south and east. However,
any storms that do develop in the area will be capable of all severe
weather hazards.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Freezing temperatures are expected across much of the area Saturday
and Sunday mornings. This could damage sensitive outdoor vegetation.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 17, 12:14 PM CDTFreeze WarningOAXBoone, Butler, Colfax, Dodge, Jefferson, Platte and 3 more21 hr

Nearby

Red Flag Warnings in Nebraska, 2026Red Flag Warnings in Iowa, 2026Every red flag 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.