Alert archive / Nebraska / Flash Flood Warnings in 2015

Flash Flood Warning 24, NWS Omaha, NE

September 23, 2015Burt County, Cuming County, Thurston County, Nebraska

NWS Omaha, NE issued this flash flood warning at Sep 23, 2015, 2:26 AM CDT for Burt County, Cuming County, Thurston County, Nebraska. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 23, 2015, 2:26 AM CDT (07:26 UTC)
Expired: Sep 23, 2015, 5:30 AM CDT
In force: 3 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Flood severity: None

Counties Burt County, NE, Cuming County, NE, Thurston County, NE

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 07:30 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.4 hours before the alert went out and 78 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: 504 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 1351 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

441 
WGUS53 KOAX 230726
FFWOAX
NEC021-039-173-231030-
/O.NEW.KOAX.FF.W.0024.150923T0726Z-150923T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
226 AM CDT WED SEP 23 2015

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CUMING COUNTY IN NORTHEASTERN NEBRASKA...
  SOUTHWESTERN THURSTON COUNTY IN NORTHEASTERN NEBRASKA...
  NORTHWESTERN BURT COUNTY IN EAST CENTRAL NEBRASKA...

* UNTIL 530 AM CDT
    
* AT 224 AM CDT...DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. RAINFALL AMOUNTS OF 3
  TO OVER 4 INCHES OF RAIN HAVE FALLEN...WITH ADDITIONAL AMOUNTS UP
  TO 2 INCHES POSSIBLE. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LYONS...BANCROFT...ROSALIE AND THE HIGHWAY 9 AND 51 JUNCTION. 

THIS INCLUDES HIGHWAY 77 IN NEBRASKA BETWEEN MILEMARKERS 147 AND 159.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4204 9635 4188 9646 4188 9668 4202 9679
      4217 9663

$$

DERGAN

1 follow-up statement

645 
WGUS73 KOAX 231030
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
530 AM CDT WED SEP 23 2015

NEC021-039-173-231037-
/O.EXP.KOAX.FF.W.0024.000000T0000Z-150923T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CUMING NE-THURSTON NE-BURT NE-
530 AM CDT WED SEP 23 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN CUMING...SOUTHWESTERN
THURSTON AND NORTHWESTERN BURT COUNTIES WILL EXPIRE AT 530 AM CDT...

FLOOD WATERS FROM EARLIER RAIN HAVE RECEDED AND ARE NO LONGER
EXPECTED TO POSE A THREAT. MORE RAIN IS MOVING IN FROM THE SOUTH BUT
THESE STORMS ARE MOVING MORE QUICKLY AND ARE NOT EXPECTED TO PRODUCE
FLOODING. BUT PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 4204 9635 4188 9646 4188 9668 4202 9679
      4217 9663

$$

DERGAN

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 23, 12:28 AM CDT, 1 hour 58 minutes earlier.

Area forecast discussion, Sep 23, 12:28 AM CDT, 1 hour 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1228 AM CDT WED SEP 23 2015

.SHORT TERM...(TONIGHT THROUGH FRIDAY)
ISSUED AT 238 PM CDT TUE SEP 22 2015

TRANSITIONING TO A WETTER PERIOD FOR THE SHORT TERM.

TODAY...A WARM FRONT EXTENDING WEST/EAST ACROSS THE REGION HAS
HELPED TRIGGER SEVERE STORMS EARLIER THIS MORNING WITH NUMEROUS
REPORTS OF GOLF BALL SIZE HAIL. STRONG STORMS ARE ONGOING JUST
NORTH OF THE FRONTAL BOUNDARY NORTH OF OMAHA...AND GENERALLY ALONG
AND EAST OF THE MISSOURI RIVER. OTHER SPOTTY SHOWERS HAVE POPPED
UP IN THE PLATTE RIVER VALLEY ACROSS EASTERN NEBRASKA AS DAYTIME
HEATING HAS INCREASED...BUT THESE HAVE BEEN MOSTLY SHOWERS WITH
ISOLATED THUNDER.

HEIGHT FALLS BEGIN IN EARNEST ACROSS THE REGION TONIGHT. SHOULD
SEE MORE WIDESPREAD COVERAGE WEST OF THE REGION OVERNIGHT ACROSS
THE WESTERN HIGH PLAINS...BUT WITH A MOIST AXIS REMAINING IN PLACE
ACROSS THE MISSOURI VALLEY...WILL MAINTAIN LOW CHANCE POPS FOR
SHOWERS/THUNDERSTORMS OVERNIGHT.

IF ANYTHING DOES POP UP OVERNIGHT...IT COULD LINGER WEDNESDAY
MORNING. AGAIN...THE BETTER COVERAGE WILL LIKELY BE WEST OF THE
FORECAST AREA ACROSS CENTRAL NEBRASKA...THEN MOVING TOWARD AT
LEAST A PORTION OF EASTERN NEBRASKA BY LATE WEDNESDAY AFTERNOON.

POPS FOR OUR AREA SUBSTANTIALLY INCREASE WEDNESDAY NIGHT THROUGH
THURSDAY AS THE UPPER LOW MOVES INTO THE REGION AND STALLS. PRECIP
CHANCES BEGINS TO WANE LATE THURSDAY NIGHT AS THE UPPER LOW
FINALLY DRIFTS TO THE SOUTH...WITH LINGERING PRECIP CHANCES ACROSS
SOUTHEAST NEBRASKA FRIDAY MORNING.

.LONG TERM...(FRIDAY NIGHT THROUGH TUESDAY)
ISSUED AT 238 PM CDT TUE SEP 22 2015

QUIET WEATHER EXPECTED DURING THE EXTENDED PERIOD AS THE UPPER
RIDGE REBUILDS ACROSS THE REGION. TEMPS SHOULD BE JUST ABOVE
NORMAL IN THE UPPER 70S TO LOWER 80S. ANOTHER WEAK TROUGH MOVES
THROUGH THE NORTHERN PLAINS LATE IN THE PERIOD...WHICH SHOULD HELP
PUSH A COOL FRONT INTO THE REGION SUNDAY NIGHT...WITH SLIGHTLY
BELOW NORMAL TEMPS FOR MONDAY...MORE IN LINE WITH THE ECMWF
INSTEAD OF THE GFS.

&&

.AVIATION...(06Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 1222 AM CDT WED SEP 23 2015

INFLUX OF LLVL MOISTURE AND PASSING UPPER DISTURBANCE WILL LIKELY
INDUCE SCT TSRA OVER ERN NEB EARLY THIS MORNING. GIVEN THE TRACK
OF THE UPPER DISTURBANCE...EXPECT PCPN ACTIVITY/MVFR CONDITIONS
GENERALLY BTWN 09Z-13Z. ALSO...HAVE INCLUDED PROB30 GROUP THRU THE
AFTN AS THERE IS AT LEAST A SMALL CHANCE OF CONVECTION FIRING
AT THAT TIME.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&

SHORT TERM...DEWALD
LONG TERM...DEWALD
AVIATION...DEE

Hazardous weather outlook, Sep 22, 4:27 PM CDT, 9 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
427 PM CDT TUE SEP 22 2015

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-231130-
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-
427 PM CDT TUE SEP 22 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...TONIGHT AND WEDNESDAY

THUNDERSTORM CHANCES WILL CONTINUE THROUGH TONIGHT WITH INCREASING
CHANCES ON WEDNESDAY.

.DAYS TWO THROUGH SEVEN...WEDNESDAY NIGHT THROUGH TUESDAY

THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY NIGHT THROUGH THURSDAY
NIGHT OVER THE OUTLOOK AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT OR WEDNESDAY.

In the hours before

Special weather statement, Sep 22, 10:47 PM CDT, 3 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1047 PM CDT TUE SEP 22 2015

NEZ031>033-042>044-230430-
DODGE NE-COLFAX NE-PLATTE NE-STANTON NE-MADISON NE-CUMING NE-
1047 PM CDT TUE SEP 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR STANTON...NORTHWESTERN DODGE...
WESTERN CUMING...NORTHERN COLFAX...SOUTHEASTERN MADISON AND
NORTHEASTERN PLATTE COUNTIES UNTIL 1130 PM CDT...

AT 1046 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR LEIGH...OR 21 MILES SOUTH OF NORFOLK...MOVING NORTH AT 20 MPH.
OTHER STORMS ARE OCCURRING OVER PARTS OF STANTON AND CUMING
COUNTIES...AND COULD ALSO PRODUCE HAIL.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
STANTON...WISNER...CLARKSON...DODGE...HOWELLS...LEIGH...PILGER...
CRESTON...MAPLE CREEK RECREATION AREA...THE HIGHWAY 15 AND 32
JUNCTION...8 MILES SOUTH OF STANTON AND 10 MILES WEST OF WEST POINT.

THIS INCLUDES HIGHWAY 275 IN NEBRASKA BETWEEN MILE MARKERS 78 AND
106.

LAT...LON 4174 9739 4174 9738 4175 9739 4208 9737
      4208 9680 4172 9684 4166 9739
TIME...MOT...LOC 0346Z 197DEG 17KT 4175 9727

MILLER

Local storm report, Sep 22, 11:05 PM CDT, 3 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1105 PM CDT TUE SEP 22 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1058 PM     HAIL             5 N WAUSA               42.57N 97.54W
09/22/2015  E1.00 INCH       KNOX               NE   PUBLIC

&&

LANDSVORK

Special weather statement, Sep 22, 11:13 PM CDT, 3 hours 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1113 PM CDT TUE SEP 22 2015

NEZ012-015-018-032-033-230500-
CEDAR NE-STANTON NE-THURSTON NE-CUMING NE-WAYNE NE-
1113 PM CDT TUE SEP 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN STANTON...
SOUTHEASTERN CEDAR...NORTHWESTERN CUMING...WESTERN THURSTON AND WAYNE
COUNTIES UNTIL MIDNIGHT CDT...

AT 1112 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 4
MILES SOUTH OF WINSIDE...OR 12 MILES NORTHEAST OF NORFOLK...MOVING
NORTH AT 30 MPH. OTHER STORMS WERE  MOVING ACROSS PARST OF CUMING
COUNTY.

HAIL UP TO NICKEL SIZE...HEAVY RAIN AND GUSTY WINSD WILL BE POSSIBLE
WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
WAYNE...WAKEFIELD...WISNER...WINSIDE...PILGER...HOSKINS...CARROLL...
BELDEN AND 8 MILES SOUTH OF WAYNE.

THIS INCLUDES HIGHWAY 275 IN NEBRASKA BETWEEN MILE MARKERS 90 AND
103.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4238 9702 4227 9702 4226 9679 4196 9689
      4205 9733 4241 9721
TIME...MOT...LOC 0412Z 190DEG 26KT 4211 9720

MILLER

Special weather statement, Sep 22, 11:24 PM CDT, 3 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1124 PM CDT TUE SEP 22 2015

NEZ012-018-032>034-043-044-230515-
DODGE NE-COLFAX NE-CEDAR NE-STANTON NE-BURT NE-CUMING NE-WAYNE NE-
1124 PM CDT TUE SEP 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN STANTON...SOUTHERN
CEDAR...NORTHWESTERN DODGE...CUMING...NORTHEASTERN COLFAX...WEST
CENTRAL BURT AND SOUTHWESTERN WAYNE COUNTIES UNTIL 1215 AM CDT...

AT 1124 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHWEST OF
STANTON TO 4 MILES SOUTHWEST OF SCRIBNER...AND MOVING NORTH AT
15 MPH.

HAIL UP TO NICKEL SIZE...HEAVY RAIN AND WINDS IN EXCESS OF 30 MPH
WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
WEST POINT...STANTON...WISNER...SCRIBNER...BEEMER...DODGE...
WINSIDE...PILGER...SNYDER...HOSKINS...CARROLL...SHOLES...THE HIGHWAY
15 AND 32 JUNCTION...10 MILES WEST OF WEST POINT...8 MILES SOUTH OF
WAYNE...THE HIGHWAY 9 AND 51 JUNCTION AND DEAD TIMBER STATE
RECREATION AREA.

THIS INCLUDES HIGHWAY 275 IN NEBRASKA BETWEEN MILE MARKERS 79 AND
135.

LAT...LON 4188 9650 4149 9663 4201 9736 4236 9730
TIME...MOT...LOC 0424Z 176DEG 12KT 4202 9727 4161 9671

MILLER

Local storm report, Sep 22, 11:38 PM CDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1138 PM CDT TUE SEP 22 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1123 PM     HAIL             BLOOMFIELD              42.60N 97.65W
09/22/2015  M0.75 INCH       KNOX               NE   PUBLIC

&&

CZAPOTOC

Special weather statement, Sep 22, 11:46 PM CDT, 2 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1146 PM CDT TUE SEP 22 2015

NEZ012-230530-
CEDAR NE-
1146 PM CDT TUE SEP 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CEDAR COUNTY UNTIL 1230
AM CDT...

AT 1146 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5
MILES SOUTHWEST OF HARTINGTON...OR 23 MILES SOUTH OF YANKTON...MOVING
NORTHEAST AT 25 MPH.

HAIL UP TO DIME SIZE...VERY HEAVY RAIN AND WINDS IN EXCESS OF 40 MPH
WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
HARTINGTON...COLERIDGE...WYNOT...PLEASANT VALLEY...FORDYCE...ST.
HELENA...OBERT AND BROOKY BOTTOM.

THIS INCLUDES HIGHWAY 81 IN NEBRASKA BETWEEN MILEMARKERS 194 AND 197.

LAT...LON 4284 9722 4283 9722 4281 9720 4280 9716
      4277 9713 4277 9706 4276 9701 4258 9702
      4243 9732 4257 9746 4286 9725 4286 9724
TIME...MOT...LOC 0446Z 231DEG 21KT 4255 9734

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 7:16 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	31 min
Sep 22, 9:51 PM CDT	Severe Thunderstorm Warning	OAX	Platte	39 min
Sep 22, 10:01 PM CDT	Special Weather Statement	OAX	Cedar	29 min
Sep 22, 10:12 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	48 min
Sep 22, 10:23 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	37 min
Sep 22, 10:28 PM CDT	Special Weather Statement	OAX	Cuming	32 min
Sep 22, 10:47 PM CDT	Special Weather Statement	OAX	Stanton	43 min
Sep 22, 10:57 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	48 min
Sep 22, 11:07 PM CDT	Areal Flood Advisory	OAX	Cedar, Knox	3 hr
Sep 22, 11:13 PM CDT	Special Weather Statement	OAX	Wayne	47 min
Sep 22, 11:24 PM CDT	Special Weather Statement	OAX	Cuming, Dodge, Stanton, Wayne	51 min
Sep 22, 11:32 PM CDT	Flash Flood Warning	OAX	Cedar, Knox	4 hr
Sep 22, 11:46 PM CDT	Special Weather Statement	OAX	Cedar	44 min
Sep 22, 11:54 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Wayne	36 min
Sep 23, 12:30 AM CDT	Flash Flood Warning	OAX	Cedar, Knox	3 hr
Sep 23, 4:31 AM CDT	Flash Flood Watch	OAX	Antelope, Burt, Cass, Cedar, Cuming, Douglas and 8 more	28 hr
Sep 23, 4:46 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	29 min
Sep 23, 7:00 AM CDT	Flash Flood Warning	OAX	Douglas	3 hr
Sep 23, 9:52 AM CDT	Areal Flood Warning	OAX	Douglas	6 hr
Sep 23, 5:53 PM CDT	Special Weather Statement	OAX	Butler	22 min
Sep 23, 6:20 PM CDT	Special Weather Statement	OAX	Johnson	40 min
Sep 23, 6:43 PM CDT	Special Weather Statement	OAX	Cass, Otoe	32 min
Sep 23, 6:47 PM CDT	Special Weather Statement	OAX	Butler	28 min

Nearby

Flash Flood Warnings in Nebraska, 2015 Every flash flood warning in 2015

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.