Alert archive / Nebraska / Flash Flood Warnings in 2019

Flash Flood Warning 43, NWS Omaha, NE

September 19, 2019Cuming County, Thurston County, Nebraska; Monona County, Iowa

NWS Omaha, NE issued this flash flood warning at Sep 19, 2019, 4:00 AM CDT for Cuming County, Thurston County, Nebraska; Monona County, Iowa. It was in force for 5 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
Sep 19, 2019, 4:00 AM CDT (09:00 UTC)
Expired
Sep 19, 2019, 8:45 AM CDT
In force
5 hr
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Flood severity
None

Counties Monona County, IA, Cuming County, NE, Thurston County, NE

The radar

The Omaha radar (KOAX), 80 km from the middle of the area, began a volume at 09:01 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

Omaha, NE (KOAX), launched 00:00Z, 9.0 hours before the alert went out and 80 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, Omaha, NE at 00:00Z on 2019-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2448 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, Omaha, NE at 00:00Z on 2019-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.193958Sfc1 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
2448 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
1305 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
381 m²/s²
Significant tornado parameter
2.3
Supercell composite
8.8

Open this sounding in Storm Lab

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 Omaha, NE wrote its last area forecast discussion before this flash flood warning went out at Sep 19, 3:40 AM CDT, 20 minutes earlier.

Area forecast discussion, Sep 19, 3:40 AM CDT, 20 minutes before
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Hazardous weather outlook, Sep 18, 5:50 PM CDT, 10 hours 10 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
550 PM CDT Wed Sep 18 2019

IAZ091-NEZ011-012-015>018-030>033-042>044-050-051-065-066-078-
088>093-191300-
Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison-
Stanton-Cuming-Platte-Colfax-Dodge-Butler-Saunders-Seward-
Lancaster-Saline-Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson-
550 PM CDT Wed Sep 18 2019

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

.DAY ONE...Tonight and Thursday

Minor to locally moderate flooding will continue along the
Missouri River above Lewis and Clark Lake, and from near Decatur
southward past Rulo.

Isolated to scattered thunderstorms are possible tonight and
Thursday. Some storms may produce large hail
through early evening. Lightning, brief downpours of heavy rain
and some gusty winds are possible with storms.

.DAYS TWO THROUGH SEVEN...Thursday night through Wednesday

River levels along the Missouri River will continue to rise from
Blair southward past Rulo. A crest is expected in Blair sometime
Thursday, while Rulo will not crest until Sunday. Flooding is
expected to remain in the minor to moderate range. Road closures
are possible along Interstate 29 in Pottawattamie County, with a
lesser risk of impacts to Interstate 680. Additional rainfall
late this week into the weekend may have impacts on the river
level forecasts and the timing of crests. Anyone with travel plans
along Interstate 29 or interests along the Missouri River should
monitor the forecast closely this week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed on an isolated bases through
early this evening.

IAZ043-055-056-069-079-080-090-NEZ034-045-052-053-067-068-191300-
Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Burt-Washington-Douglas-Sarpy-Cass-Otoe-
550 PM CDT Wed Sep 18 2019

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

.DAY ONE...Tonight and Thursday

A flood watch is in effect until Thursday morning.

Minor to locally moderate flooding will continue along the
Missouri River above Lewis and Clark Lake, and from near Decatur
southward past Rulo.

Thunderstorms are expected tonight and Thursday. Some storms may
produce large hail through early evening. Lightning, downpours of
heavy rain and some gusty winds are the main hazards. Rainfall
rates of 1 to 2 inches per hour are possible with the stronger
storms. Due to recent rains and with flooding ongoing, additional
flooding/flash flooding could develop.

.DAYS TWO THROUGH SEVEN...Thursday night through Wednesday

River levels along the Missouri River will continue to rise from
Blair southward past Rulo. A crest is expected in Blair sometime
Thursday, while Rulo will not crest until Sunday. Flooding is
expected to remain in the minor to moderate range. Road closures
are possible along Interstate 29 in Pottawattamie County, with a
lesser risk of impacts to Interstate 680. Additional rainfall
late this week into the weekend may have impacts on the river
level forecasts and the timing of crests. Anyone with travel plans
along Interstate 29 or interests along the Missouri River should
monitor the forecast closely this week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed on an isolated basis through
early evening. Heavy rainfall reports are appreciated.

Zapotocny

In the hours before

Special weather statement, Sep 18, 10:47 PM CDT, 5 hours 13 minutes before
Special Weather Statement
National Weather Service Omaha/Valley Nebraska
1047 PM CDT Wed Sep 18 2019

NEZ032-033-190415-
Stanton NE-Cuming NE-
1047 PM CDT Wed Sep 18 2019

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CUMING AND EAST CENTRAL
STANTON COUNTIES UNTIL 1115 PM CDT...

At 1046 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles south of Wisner, or 25 miles east of Norfolk, moving northeast
at 25 mph.

Penny size hail will be possible with this storm.

Locations impacted include...
Wisner, Beemer, The Highway 15 And 32 Junction and 10 Miles West Of
West Point.

LAT...LON 4178 9703 4190 9711 4208 9679 4188 9669
TIME...MOT...LOC 0346Z 241DEG 23KT 4189 9695

HB
Special weather statement, Sep 19, 1:11 AM CDT, 2 hours 49 minutes before
Special Weather Statement
National Weather Service Omaha/Valley Nebraska
111 AM CDT Thu Sep 19 2019

IAZ043-NEZ015-017-018-030>034-190700-
Monona IA-Stanton NE-Thurston NE-Madison NE-Burt NE-Pierce NE-
Boone NE-Cuming NE-Wayne NE-
111 AM CDT Thu Sep 19 2019

...SIGNIFICANT WEATHER ADVISORY FOR MONONA...NORTHERN MADISON...
NORTHERN BURT...WAYNE...NORTHERN CUMING...SOUTHERN PIERCE...
THURSTON...NORTHEASTERN BOONE AND NORTHERN STANTON COUNTIES UNTIL 200
AM CDT...

At 110 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles north of Elgin to 4 miles northeast of
Pilger to near Moorhead. Movement was northeast at 15 mph.

Very heavy rainfall, penny size hail and winds in excess of 30 mph
will be possible with these storms.

Locations impacted include...
Norfolk, Wayne, Onawa, Pierce, Stanton, Wakefield, Battle Creek,
Wisner, Pender, Lyons, Walthill, Winnebago, Whiting, Beemer,
Bancroft, Decatur, Winside, Ute, Pilger and Meadow Grove.

This includes Interstate 29 between mile markers 101 and 125.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4192 9783 4214 9784 4221 9779 4231 9715
      4231 9702 4226 9701 4227 9635 4222 9633
      4221 9608 4211 9567 4191 9567 4186 9581
      4191 9670 4188 9737 4190 9800
TIME...MOT...LOC 0610Z 241DEG 15KT 4205 9807 4207 9702 4190 9588

KG
Local storm report, Sep 19, 1:52 AM CDT, 2 hours 8 minutes before
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Local storm report, Sep 19, 2:21 AM CDT, 1 hour 39 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 7:06 PM CDTSpecial Weather StatementOAXCass24 min
Sep 18, 7:34 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe, Saunders26 min
Sep 18, 8:04 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster20 min
Sep 18, 9:12 PM CDTSpecial Weather StatementOAXDodge33 min
Sep 18, 9:15 PM CDTSevere Thunderstorm WarningOAXColfax, Cuming, Dodge30 min
Sep 18, 9:58 PM CDTFlash Flood WarningOAXColfax, Cuming, Dodge3 hr
Sep 18, 10:47 PM CDTSpecial Weather StatementOAXCuming28 min
Sep 19, 12:29 AM CDTFlash Flood WarningOAXBurt, Cuming, Stanton, Thurston, Wayne10 hr
Sep 19, 1:11 AM CDTSpecial Weather StatementOAXCuming, Madison, Stanton, Thurston, Wayne49 min
Sep 19, 2:40 AM CDTFlash Flood WarningOAXPierce, Stanton, Wayne6 hr
Sep 19, 2:46 AM CDTFlash Flood WarningOAXBurt, Thurston6 hr
Sep 19, 4:05 AM CDTFlash Flood WarningOAXCedar, Pierce, Wayne5 hr
Sep 19, 4:47 AM CDTSpecial Weather StatementOAXBurt, Douglas, Sarpy, Washington43 min
Sep 19, 5:06 AM CDTFlash Flood WarningOAXBurt, Douglas, Washington6 hr
Sep 19, 5:52 AM CDTAreal Flood AdvisoryOAXDouglas, Sarpy3 hr
Sep 19, 6:56 AM CDTFlash Flood WarningOAXDouglas, Sarpy, Saunders4 hr
Sep 19, 9:37 AM CDTAreal Flood WarningOAXBurt, Cedar, Colfax, Cuming, Dodge, Douglas and 6 more6 hr
Sep 19, 11:02 AM CDTAreal Flood WarningOAXDouglas, Sarpy5 hr

Nearby

Flash Flood Warnings in Nebraska, 2019Flash Flood Warnings in Iowa, 2019Every flash flood warning in 2019

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.