Alert archive / Nebraska / Flash Flood Warnings in 2000

Flash Flood Warning 3, NWS Omaha, NE

June 23, 2000Cass County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jun 23, 2000, 8:44 PM CDT for Cass 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jun 23, 2000, 8:44 PM CDT (01:44 UTC)
Expired: Jun 24, 2000, 2:30 AM CDT
In force: 6 hr
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cass County, NE

The radar

The Omaha radar (KOAX), 47 km from the middle of the area, began a volume at 01:44 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, 1.7 hours before the alert went out and 47 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: 3677 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1176 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 21.8

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KOAX 240144
FFWOAX
NEC025-240730-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
844 PM CDT FRI JUN 23 2000

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CASS COUNTY IN SOUTHEAST NEBRASKA

* UNTIL 230 AM CDT

* AT 828 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY
  HEAVY RAIN UP TO 5 INCHES HAD FALLEN ACROSS MUCH OF CASS COUNTY.
  THIS IS ENOUGH RAIN TO CAUSE RAPID FLOODING OF SMALL STREAMS.
  WEEPING WATER CREEK IS ALSO LIKELY TO FLOOD.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

LAT...LON 4095 9640 4077 9641 4081 9600 4091 9583
          4105 9606 4102 9616

POLLACK
NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 7:05 PM CDT	Tornado Warning	OAX	Richardson	25 min
Jun 23, 7:37 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster	38 min
Jun 23, 7:53 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	52 min
Jun 23, 8:17 PM CDT	Severe Thunderstorm Warning	OAX	Cass	43 min
Jun 23, 8:56 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	49 min
Jun 23, 8:59 PM CDT	Severe Thunderstorm Warning	OAX	Boone	46 min
Jun 23, 9:04 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte	41 min
Jun 23, 9:23 PM CDT	Severe Thunderstorm Warning	OAX	Colfax	52 min
Jun 23, 9:42 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	48 min
Jun 23, 9:48 PM CDT	Severe Thunderstorm Warning	OAX	Madison	42 min
Jun 23, 10:28 PM CDT	Flash Flood Warning	OAX	Nemaha, Otoe, Richardson	4 hr
Jun 23, 10:30 PM CDT	Flash Flood Warning	OAX	Madison	4 hr
Jun 24, 12:00 AM CDT	Severe Thunderstorm Warning	OAX	Butler	30 min
Jun 24, 1:28 AM CDT	Severe Thunderstorm Warning	OAX	Cedar	32 min
Jun 24, 2:33 AM CDT	Flash Flood Warning	OAX	Madison	4 hr

Nearby

Flash Flood Warnings in Nebraska, 2000 Every flash flood warning in 2000

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.