4 products issued by NWS for: Defiance IA
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
821 AM CDT Tue May 21 2024

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-220330-
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-
821 AM CDT Tue May 21 2024

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



Severe storms will again be possible this morning into the early
afternoon. The time frame for severe weather will be from around
11 am through 3 pm. Large hail, damaging wind gusts and flash
flooding are the main hazards. Tornadoes are possible along and
east of the Missouri River.



There will be another marginal risk of severe weather on
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation might be required late this morning into the
early afternoon.

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Flood Warning
National Weather Service Omaha/Valley NE
733 AM CDT Tue May 21 2024

IAC085-155-165-NEC021-023-037-053-055-155-177-212100-
/O.NEW.KOAX.FA.W.0002.240521T1233Z-240521T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Harrison IA-Pottawattamie IA-Shelby IA-Burt NE-Butler NE-Colfax
NE-Dodge NE-Douglas NE-Saunders NE-Washington NE-
733 AM CDT Tue May 21 2024



* WHAT...Flooding caused by excessive rainfall is occurring, and is
expected to continue through early afternoon.

* WHERE...Portions of Harrison, Pottawattamie and Shelby counties in
Iowa, and Burt, Butler, Colfax, Dodge, Douglas, Saunders and
Washington counties in Nebraska.

* WHEN...Until 400 PM CDT Tuesday.

* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
and flood-prone locations is occurring. While some of the smaller
streams have already reached their highest levels, some of the
larger streams will continue to rise due to excess runoff from
earlier rainfall. It will take several hours for all the water
from these storms to work through local drainage systems in some
urban areas.

* ADDITIONAL DETAILS...
- At 727 AM CDT, emergency management, trained spotters,
public, and broadcast media have reported heavy rain in the
warned area due to thunderstorms. Flooding is ongoing.
Between 3 and 7 inches of rain have fallen in most of the
warned area, but up to 10 inches of rain is estimated by
radar in western Saunders county.
- Some locations within this larger flood warning remain in a
flash flood warning. These areas can expect the continued
threat of very rapid rises in water levels until those flash
flood warnings expire.
- Some locations that will experience flooding include...
Omaha, northern Council Bluffs, Fremont, Blair, Harlan,
Wahoo, David City, Tekamah, Bennington, Boys Town, Elkhorn,
Carter Lake, Missouri Valley, Valley, Logan, Avoca,
Arlington, North Bend, Yutan and Underwood.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.



LAT...LON 4127 9729 4155 9683 4160 9644 4183 9624
4184 9612 4158 9611 4180 9548 4180 9509
4160 9509 4160 9504 4150 9504 4151 9515
4144 9515 4124 9582 4127 9635 4105 9668
4105 9729

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Flash Flood Warning
IAC085-155-165-NEC177-211600-
/O.NEW.KOAX.FF.W.0016.240521T1211Z-240521T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Omaha/Valley NE
711 AM CDT Tue May 21 2024

The National Weather Service in Omaha/Valley has issued a

* Flash Flood Warning for...
Southern Harrison County in southwestern Iowa...
Northern Pottawattamie County in southwestern Iowa...
Southwestern Shelby County in southwestern Iowa...
Southeastern Washington County in east central Nebraska...

* Until 1100 AM CDT.

* At 711 AM 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 1 to 2 inches in 1
hour. 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...
Blair, Harlan, Missouri Valley, Avoca, Underwood, Fort Calhoun,
Neola, Walnut, Shelby, Crescent, Minden, Kennard, Persia, Hancock,
Portsmouth, Washington, Westphalia, Tennant, Kirkman and Arrowhead
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.



LAT...LON 4161 9587 4167 9556 4173 9542 4176 9527
4172 9518 4162 9516 4151 9516 4141 9516
4139 9542 4132 9577 4135 9592 4140 9594
4140 9632 4151 9626 4158 9613

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

---

Flood Watch
National Weather Service Omaha/Valley NE
304 AM CDT Tue May 21 2024

IAZ043-055-056-069-079-080-090-091-NEZ015-033-034-042>045-050>053-
065>068-078-211615-
/O.CON.KOAX.FA.A.0003.000000T0000Z-240522T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page-Thurston-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler-
Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline-
Including the cities of Columbus, Wisner, Plattsmouth, Wahoo,
Papillion, David City, Crete, Logan, Council Bluffs, West Point,
Red Oak, Lincoln, Decatur, Harlan, Shenandoah, Sidney, Omaha,
Schuyler, La Vista, Missouri Valley, Tekamah, Glenwood, Macy,
Winnebago, Blair, Clarinda, Seward, Ashland, Lyons, Hamburg,
Mapleton, Fremont, Dunlap, Yutan, Bellevue, Pender, Oakland,
Milford, Onawa, Wilber, Walthill, Woodbine, Tabor, Nebraska City,
and Farragut
304 AM CDT Tue May 21 2024



* WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...Portions of Iowa, including the following counties,
Fremont, Harrison, Mills, Monona, Montgomery, Page, Pottawattamie
and Shelby and Nebraska, including the following counties, Burt,
Butler, Cass, Colfax, Cuming, Dodge, Douglas, Lancaster, Otoe,
Platte, Saline, Sarpy, Saunders, Seward, Thurston and Washington.

* WHEN...Through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
- Thunderstorms will continue through the morning hours before
ending by early afternoon.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.