Alert archive / Nebraska / Flash Flood Warnings in 2004

Flash Flood Warning 27, NWS Omaha, NE

June 12, 2004Sarpy County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jun 12, 2004, 4:33 PM CDT for Sarpy County, Nebraska. It was in force for 6 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: Jun 12, 2004, 4:33 PM CDT (21:33 UTC)
Expired: Jun 12, 2004, 10:15 PM CDT
In force: 6 hr
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

County Sarpy County, NE

The radar

The Omaha radar (KOAX), 32 km from the middle of the area, began a volume at 21:36 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 12:00Z, 9.6 hours before the alert went out and 32 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: 232 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 2084 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KOAX 122136
FFWOAX
NEC153-130030-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA NE
433 PM CDT SAT JUN 12 2004

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SARPY COUNTY IN EAST CENTRAL NEBRASKA

* UNTIL 730 PM CDT

* AT 431 PM CDT...HEAVY RAIN OVER 2 INCHES HAD FALLEN IN A SHORT 
TIME IN CENTRAL SARPY COUNTY.  THE HEAVY RAIN AREA WILL MOVE EAST 
THROUGH THE COUNTY...BUT ADDITIONAL THUNDERSTORMS MAY DEVELOP.
THE HEAVY RAIN WILL CAUSE RAPID URBAN FLOODING...AND ALSO ALONG
AREA STREAMS.

SOME LOCATIONS AFFECTED INCLUDE...BELLEVUE...CHALCO...LA VISTA...
OFFUTT AFB...PAPILLION...SPRINGFIELD...

MOST FLOOD FATALITIES ARE VEHICLE RELATED. AS LITTLE AS SIX INCHES OF
WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR VEHICLE. TWO FEET OF
RUSHING WATER CAN CARRY AWAY MOST VEHICLES...THIS INCLUDES PICKUPS
AND SPORT UTILITY VEHICLES.

LAT...LON 4119 9623 4106 9624 4106 9609 4106 9586
      4118 9587

$$

POLLACK

2 follow-up statements

000 
WGUS73 KOAX 122313
FFSOAX
NEC055-153-130015-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
611 PM CDT SAT JUN 12 2004

...A FLASH FLOOD WARNING CONTINUES FOR SARPY COUNTY UNTIL 730 PM 
CDT...
...A FLASH FLOOD WARNING CONTINUES FOR DOUGLAS COUNTY UNTIL 1015 PM
CDT...

AT 611 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
MODERATE TO HEAVY RAIN CONTINUING ACROSS SARPY AND DOUGLAS 
COUNTIES.  ADDITIONAL THUNDERSTORMS ARE LIKELY TO CROSS THE 
AREA IN THE NEXT COUPLE OF HOURS.  THE THREAT OF FLASH FLOODING
CONTINUES.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. AS LITTLE AS SIX
INCHES OF WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR VEHICLE. THIS
INCLUDES PICKUP TRUCKS AND SPORT UTILITY VEHICLES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT...OR HAS A HIGH
PROBABILITY OF OCCURRING.

LAT...LON 4140 9640 4107 9631 4107 9590 4141 9594

$$

POLLACK

000 
WGUS73 KOAX 130035
FFSOAX
NEC055-153-130130-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
733 PM CDT SAT JUN 12 2004

...FLASH FLOOD WARNING FOR DOUGLAS COUNTY CANCELLED...
...FLASH FLOOD WARNING FOR SARPY COUNTY EXPIRES...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE RAIN WAS
DECREASING IN COVERAGE...AND THE FLOOD THREAT WAS DIMINISHING.
NO FLOODING HAS BEEN REPORTED RECENTLY ON STREAMS OR HIGHWAYS...
AND NONE IS EXPECTED THE REST OF THE EVENING.

LAT...LON 4139 9639 4104 9631 4107 9590 4139 9596

$$

POLLACK

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 Jun 12, 2:17 PM CDT, 2 hours 16 minutes earlier.

Area forecast discussion, Jun 12, 2:17 PM CDT, 2 hours 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
217 PM CDT SAT JUN 12 2004

.DISCUSSION...
BRIEF DISCUSSION THIS AFTERNOON WITH SEVERE WEATHER ACROSS THE CWA.

ATMOSPHERE IS DESTABILIZING RAPIDLY...PARTICULARLY ACROSS SOUTHER
SECTIONS OF THE CWA. MSAS SBCAPES OVER NRN KS WERE OVER 4000
J/KG WITH LIS PUSHING -13. A CLUSTER OF STORMS HAVE BROKEN OUT OVER
THE CWA AND WAS PUSHING EAST/NORTHEAST. A STALLED FRONTAL BOUNDARY
FROM SRN MN INTO SERN NEB AND NRN KS IS THE DIVIDING LINE FOR AN
UNSTABLE AIR MASS. WEAK MLCINH AND FAVORABLE LSI VALUES INDICATE NO
SIGNIFICANT CAPPING PRESENT TO HAMPER STORM DEVELOPMENT. ALSO...
MOIST SOUTHERLY WINDS SOUTH OF THE FRONT HELPING TO ENHANCE
CURRENTLY ACTIVE STORMS.

SHORT TERM CONCERNS ARE FOR MORE STORMS THIS EVENING. LATEST SPC DAY
1 SHOWS SOUTHERN SECTIONS OF THE CWA IN THE MODERATE RISK. THE
MODELS ARE SHOWING A FEW EMBEDDED SHORT WAVES MOVING THRU THE FLOW
OF THE NORTH CENTRAL PLAINS BROAD TROF WHICH SHOULD HELP ENHANCE
ADDITIONAL ACTIVITY...ALBEIT MAINLY SOUTH WERE HIGH LEVEL OF
INSTABILITY AND MOISTURE REMAIN. THEREFORE WILL COVER SOUTHERN
SECTIONS...MAINLY SOUTH OF I-80...HEAVILY WITH POPS AND SMALL POPS
ELSEWHERE. FOR SUNDAY...THE UPPER LEVEL TROF AXIS MOVES EAST OF THE
AREA...TAKING PCPN CHANCES WITH IT. HOWEVER...WILL KEEP SOME SLGT
POPS IN PLACE OVER ERN SECTIONS OF THE CWA FOR ANY EXITING
ACTIVITY.

IN THE EXTENDED PERIODS...PCPN CHANCES RETURN MONDAY AND CONTINUE
THROUGH MONDAY NIGHT. THE ETA ADVERTISES LOW LEVEL QG-
FRONTOGENETIC FORCING OVER THE CWA AS DEEP LAYER OMEGA VALUES
INCREASE THRU THE AFTERNOON AND INTO THE OVERNIGHT HOURS. GOING POP
FCST SEEM REASONABLE AT THE MOMENT. FOR TUESDAY AND BEYOND...PCPN
CHANCES WILL BE DETERMINED BY LOW LEVEL BOUNDARY LOCATION.
CONFIDENT RATHER LOW GIVEN EXTENDED MODEL DIFFERENCES.

 &&

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

&&

DEE

Hazardous weather outlook, Jun 12, 11:36 AM CDT, 4 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1136 AM CDT SAT JUN 12 2004

IAZ043-055-056-NEZ011-012-015>018-030>034-042>045-122300-
ANTELOPE-BOONE-BURT-CEDAR-COLFAX-CUMING-DODGE-HARRISON IA-KNOX-
MADISON-MONONA IA-PIERCE-PLATTE-SHELBY IA-STANTON-THURSTON-
WASHINGTON-WAYNE-
1136 AM CDT SAT JUN 12 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF EASTERN NEBRASKA AND
SOUTHWEST IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON INTO TONIGHT.
SEVERE STORMS ARE POSSIBLE EARLY THIS AFTERNOON INTO THIS EVENING
WITH HAIL AND DAMAGING WINDS THE MAIN HAZARD.

LOW PRESSURE OVER KANSAS AND A WARM FRONT IN SOUTHEAST NEBRASKA WILL
BRING WARM AND MOIST AIR BACK NORTH INTO EASTERN NEBRASKA AND
SOUTHWEST IOWA.  STRONG INSTABILITY AND AN UPPER LEVEL
DISTURBANCE MOVING INTO EASTERN NEBRASKA WILL HELP CAUSE THUNDERSTORM
DEVELOPMENT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH TUESDAY AND AGAIN
THURSDAY.  THE STRONGEST STORMS WILL LIKELY BE FROM LATE AFTERNOON
THROUGH LATE EVENING. SEVERE STORMS...AGAIN WITH LARGE HAIL AND
DAMAGING WINDS...WILL BE POSSIBLE BOTH LATE SUNDAY AND LATE MONDAY.
LATER HAZARDOUS WEATHER OUTLOOKS WILL PROVIDE ADDITIONAL INFORMATION
REGARDING THUNDERSTORM ACTIVITY LATER NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE REQUIRED FROM THIS AFTERNOON
INTO LATE EVENING.

IAZ069-079-080-090-091-NEZ050>053-065>068-078-088>093-122300-
BUTLER-CASS-DOUGLAS-FREMONT IA-GAGE-JEFFERSON-JOHNSON-LANCASTER-
MILLS IA-MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-PAWNEE-POTTAWATTAMIE IA-
RICHARDSON-SALINE-SARPY-SAUNDERS-SEWARD-
1136 AM CDT SAT JUN 12 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF SOUTHEAST NEBRASKA
AND SOUTHWEST IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ALL AFTERNOON AND
EVENING.  LARGE HAIL...DAMAGING WINDS ARE THE PRIMARY THREATS...BUT
ISOLATED TORNADOES ARE POSSIBLE. HEAVY RAIN COULD ALSO ACCOMPANY THE
STRONGER STORMS.

VERY UNSTABLE CONDITIONS HAVE DEVELOPED AS WARM MOIST AIR MOVES
NORTH INTO THE REGION FROM KANSAS AND MISSOURI.  STRONG
THUNDERSTORMS HAVE DEVELOPED EARLY...AND STORMS ARE LIKELY TO
CONTINUE INTO THE EVENING.

DUE TO THE EARLY AND RAPID DEVELOPMENT OF THUNDERSTORMS...
A CONFERENCE CALL WILL NOT BE SCHEDULED.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH TUESDAY AND AGAIN
THURSDAY.  THE STRONGEST STORMS WILL LIKELY BE FROM LATE AFTERNOON
THROUGH LATE EVENING. SEVERE STORMS...AGAIN WITH LARGE HAIL AND
DAMAGING WINDS...WILL BE POSSIBLE BOTH LATE SUNDAY AND LATE MONDAY.
LATER HAZARDOUS WEATHER OUTLOOKS WILL PROVIDE ADDITIONAL INFORMATION
REGARDING THUNDERSTORM ACTIVITY LATER NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTERS SHOULD BE PREPARED FOR IMMEDIATE ACTIVATION THIS
AFTERNOON AND EVENING.

POLLACK

In the hours before

Local storm report, Jun 12, 3:14 PM CDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
314 PM CDT SAT JUN 12 2004

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

0310 PM     HAIL             OMAHA                   41.26N 96.01W
06/12/2004  0.88 INCH        DOUGLAS            NE   AMATEUR RADIO

            178TH AND CENTER

&&

TFL

Local storm report, Jun 12, 3:58 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
358 PM CDT SAT JUN 12 2004

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

0329 PM     HAIL             OMAHA                   41.26N 96.01W
06/12/2004  0.88 INCH        DOUGLAS            NE   AMATEUR RADIO

            ONE HUNDRED SEVENTY EIGHTH AND MAPLE STREETS IN OMAHA.

&&

JB

Local storm report, Jun 12, 4:05 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
405 PM CDT SAT JUN 12 2004

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

0359 PM     HAIL             3 E WAHOO               41.22N 96.56W
06/12/2004  0.88 INCH        SAUNDERS           NE   PUBLIC

&&

JB

Local storm report, Jun 12, 4:08 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
408 PM CDT SAT JUN 12 2004

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

0405 PM     HAIL             OAKDALE                 42.07N 97.97W
06/12/2004  1.00 INCH        ANTELOPE           NE   CO-OP OBSERVER

&&

JB

Local storm report, Jun 12, 4:14 PM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
414 PM CDT SAT JUN 12 2004

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

0409 PM     HAIL             GRETNA                  41.14N 96.24W
06/12/2004  1.00 INCH        SARPY              NE   STORM CHASER

&&

JB

Local storm report, Jun 12, 4:16 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA NE
416 PM CDT SAT JUN 12 2004

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

0409 PM     HAIL             4 SW DORCHESTER         40.61N 97.17W
06/12/2004  1.00 INCH        SALINE             NE   EMERGENCY MNGR

&&

JB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 10:54 AM CDT	Severe Thunderstorm Warning	OAX	Saline	51 min
Jun 12, 11:45 AM CDT	Severe Thunderstorm Warning	OAX	Saline	45 min
Jun 12, 12:13 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster	47 min
Jun 12, 12:15 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	30 min
Jun 12, 12:25 PM CDT	Tornado Warning	OAX	Saunders	35 min
Jun 12, 12:34 PM CDT	Tornado Warning	OAX	Dodge, Saunders, Washington	56 min
Jun 12, 12:39 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	36 min
Jun 12, 12:49 PM CDT	Tornado Warning	OAX	Gage	41 min
Jun 12, 12:53 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Otoe	67 min
Jun 12, 12:59 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	46 min
Jun 12, 1:14 PM CDT	Severe Thunderstorm Warning	OAX	Cass	31 min
Jun 12, 2:18 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy, Saunders	42 min
Jun 12, 2:32 PM CDT	Severe Thunderstorm Warning	OAX	Saline	43 min
Jun 12, 2:34 PM CDT	Severe Thunderstorm Warning	OAX	Seward	41 min
Jun 12, 2:58 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	47 min
Jun 12, 3:14 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	31 min
Jun 12, 3:15 PM CDT	Severe Thunderstorm Warning	OAX	Saline	45 min
Jun 12, 3:17 PM CDT	Flash Flood Warning	OAX	Saline	6 hr
Jun 12, 3:19 PM CDT	Tornado Warning	OAX	Saline	41 min
Jun 12, 3:44 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Saunders	31 min
Jun 12, 3:58 PM CDT	Tornado Warning	OAX	Saline	62 min
Jun 12, 3:59 PM CDT	Severe Thunderstorm Warning	OAX	Butler	31 min
Jun 12, 4:01 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	29 min
Jun 12, 4:05 PM CDT	Severe Thunderstorm Warning	OAX	Antelope	25 min
Jun 12, 4:13 PM CDT	Flash Flood Warning	OAX	Douglas	6 hr
Jun 12, 4:14 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	31 min
Jun 12, 4:20 PM CDT	Severe Thunderstorm Warning	OAX	Antelope	40 min
Jun 12, 4:22 PM CDT	Severe Thunderstorm Warning	OAX	Boone	38 min
Jun 12, 4:29 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	31 min
Jun 12, 4:32 PM CDT	Tornado Warning	OAX	Lancaster	58 min
Jun 12, 4:59 PM CDT	Tornado Warning	OAX	Saline	46 min
Jun 12, 5:10 PM CDT	Severe Thunderstorm Warning	OAX	Boone	35 min
Jun 12, 5:20 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	40 min
Jun 12, 5:25 PM CDT	Flash Flood Warning	OAX	Lancaster	4 hr
Jun 12, 5:30 PM CDT	Tornado Warning	OAX	Lancaster	45 min
Jun 12, 5:46 PM CDT	Severe Thunderstorm Warning	OAX	Saline	44 min
Jun 12, 5:49 PM CDT	Severe Thunderstorm Warning	OAX	Gage	56 min
Jun 12, 5:58 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	47 min
Jun 12, 6:17 PM CDT	Flash Flood Warning	OAX	Gage	3 hr
Jun 12, 6:34 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	56 min

Nearby

Flash Flood Warnings in Nebraska, 2004 Every flash flood warning in 2004

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.