Alert archive / Nebraska / Flash Flood Warnings in 2021
Flash Flood Warning 13, NWS Omaha, NE
NWS Omaha, NE issued this flash flood warning at Oct 24, 2021, 1:47 PM CDT for Lancaster County, 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
- Oct 24, 2021, 1:47 PM CDT (18:47 UTC)
- Expired
- Oct 24, 2021, 5:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Flood severity
- None
County Lancaster County, NE
The radar
The Omaha radar (KOAX), 54 km from the middle of the area, began a volume at 18:51 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 |
|---|---|---|---|
| Oct 24, 2:31 PM CDT | HEAVY RAIN 3.8 | 4 E Lincoln, NE | STORM TOTAL SO FAR. |
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 12:00Z, 6.8 hours before the alert went out and 54 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 435 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 323 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
The text
As transmitted.
290
WGUS53 KOAX 241847
FFWOAX
NEC109-242200-
/O.NEW.KOAX.FF.W.0013.211024T1847Z-211024T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Omaha/Valley NE
147 PM CDT Sun Oct 24 2021
The National Weather Service in Omaha/Valley has issued a
* Flash Flood Warning for...
Northern Lancaster County in southeastern Nebraska...
* Until 500 PM CDT.
* At 147 PM CDT, trained weather spotters reported thunderstorms
producing heavy rain were leading to flash flooding in eastern
Lincoln. Between 2 and 3 inches of rain have fallen. Additional
rainfall amounts of 1 to 2 inches are possible in the warned area
and could lead to more flash flooding.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters 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...
Lincoln and Waverly.
This includes the following streams and drainages...
Dee Creek, Elk Creek, Antelope Creek, Dead Mans Run, Robinson
Branch Salt Creek Tributary, Little Nemaha River, Cardwell Branch,
Camp Creek, Camp Creek Tributary, Robinson Branch, Rock Creek,
Millville Creek, Stevens Creek Tributary, Ash Hollow Creek, Rock
Creek Tributary, Jordan Creek, Middle Creek, Olive Branch, Wahoo
Creek, Garr Creek, Beal Slough, Haines Branch, Oak Creek, Stevens
Creek, Salt Creek Tributary, Little Salt Creek, Haines Branch
Tributary, Hickman Branch Tributary and Hooper Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4074 9646 4069 9666 4077 9680 4085 9683
4104 9656 4105 9654 4105 9646
FLASH FLOOD...OBSERVED
$$
CA3 follow-up statements
892
WGUS73 KOAX 242039
FFSOAX
Flash Flood Statement
National Weather Service Omaha/Valley NE
339 PM CDT Sun Oct 24 2021
NEC109-242200-
/O.CON.KOAX.FF.W.0013.000000T0000Z-211024T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lancaster NE-
339 PM CDT Sun Oct 24 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CDT THIS
AFTERNOON FOR NORTHERN LANCASTER COUNTY...
At 339 PM CDT, trained spotters reported ongoing flooding in eastern
Lincoln. Between 2.5 and 4 inches of rain have fallen across the
warned area. Though the heaviest rain has come to an end, light rain
will continue, along with the threat for flooding.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Lincoln and Waverly.
This includes the following streams and drainages...
Dee Creek, Elk Creek, Antelope Creek, Dead Mans Run, Robinson
Branch Salt Creek Tributary, Little Nemaha River, Cardwell Branch,
Camp Creek, Camp Creek Tributary, Robinson Branch, Rock Creek,
Millville Creek, Stevens Creek Tributary, Ash Hollow Creek, Rock
Creek Tributary, Jordan Creek, Middle Creek, Olive Branch, Wahoo
Creek, Garr Creek, Beal Slough, Haines Branch, Oak Creek, Stevens
Creek, Salt Creek Tributary, Little Salt Creek, Haines Branch
Tributary, Hickman Branch Tributary and Hooper Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4074 9646 4069 9666 4077 9680 4085 9683
4104 9656 4105 9655 4105 9646
FLASH FLOOD...OBSERVED
$$
CA547
WGUS73 KOAX 242124
FFSOAX
Flash Flood Statement
National Weather Service Omaha/Valley NE
424 PM CDT Sun Oct 24 2021
NEC109-242200-
/O.CON.KOAX.FF.W.0013.000000T0000Z-211024T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lancaster NE-
424 PM CDT Sun Oct 24 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CDT THIS
AFTERNOON FOR PARTS OF LANCASTER COUNTY...
At 424 PM CDT, Radar indicated that the heaviest rain was ending.
Conditions should be improving and the if the trend continues, the
flash flood warning will be allowed to expire as scheduled at 5 pm.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported flash flooding earlier this
afternoon.
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...
Lincoln and Waverly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles. Do not drive into flooded areas.
&&
LAT...LON 4074 9646 4069 9666 4077 9680 4085 9683
4104 9656 4105 9655 4105 9646
FLASH FLOOD...OBSERVED
$$
Miller659
WGUS73 KOAX 242157
FFSOAX
Flash Flood Statement
National Weather Service Omaha/Valley NE
457 PM CDT Sun Oct 24 2021
NEC109-242207-
/O.EXP.KOAX.FF.W.0013.000000T0000Z-211024T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lancaster NE-
457 PM CDT Sun Oct 24 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM CDT THIS AFTERNOON FOR
NORTHERN LANCASTER COUNTY...
Heavy rain has ended and water levels should continue to drop.
Flooding is no longer expected to pose a serious threat. Please
continue to heed any remaining road closure signs.
LAT...LON 4074 9646 4069 9666 4077 9680 4085 9683
4104 9656 4105 9655 4105 9646
$$
MillerThe office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 23, 11:20 PM CDT | Special Weather Statement | OAX | Johnson | 25 min |
| Oct 23, 11:44 PM CDT | Special Weather Statement | OAX | Nemaha | 31 min |
| Oct 24, 9:41 AM CDT | Special Weather Statement | OAX | Dodge | 34 min |
| Oct 24, 12:33 PM CDT | Areal Flood Advisory | OAX | Douglas, Sarpy | 4 hr |
| Oct 24, 1:18 PM CDT | Areal Flood Advisory | OAX | Lancaster | 3 hr |
Nearby
Flash Flood Warnings in Nebraska, 2021Every flash flood warning in 2021
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.