Alert archive / Nebraska / Flash Flood Warnings in 1998

Flash Flood Warning 29, NWS Omaha, NE

July 10, 1998Johnson County, Nemaha County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jul 10, 1998, 4:26 AM CDT for Johnson County, Nemaha County, Nebraska. It was in force for 4 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
Jul 10, 1998, 4:26 AM CDT (09:26 UTC)
Expired
Jul 10, 1998, 8:25 AM CDT
In force
4 hr
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Johnson County, NE, Nemaha County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 9.4 hours before the alert went out and 107 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 1998-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 115 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 1998-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 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
115 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1243 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
-41 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 
TTAA00 KOMA 100926
FFWOMA
NEC097-127-101325-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
426 AM CDT FRI JUL 10 1998

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JOHNSON COUNTY IN SOUTHEASTERN NEBRASKA
  NEMAHA COUNTY IN SOUTHEASTERN NEBRASKA

* UNTIL 825 AM CDT

* AT 422 AM CDT... RADAR IS ESTIMATING THAT THUNDERSTORMS HAVE
PRODUCED UP TO 6 INCHES OF RAIN OVER PORTIONS OF NORTHEAST JOHNSON
AND NORTHWEST NEMAHA COUNTIES.  ADDITIONAL HEAVY RAIN IS EXPECTED
BEFORE 700 AM CDT WHICH MAY AGGREVATE FLASH FLOODING.

SOME STREAMS AFFECTED INCLUDE...TURKEY CREEK...SILVER CREEK...
SPRING CREEK...COON CREEK...LITTLE NEMAHA RIVER

DO NOT DRIVE ACROSS FLOODED ROADS.  MOST FLASH FLOOD DEATHS OCCUR
IN AUTOMOBILES.  IF YOUR VEHICLE STALLS...ABANDON IT IMMEDIATELY
AND SEEK HIGHER GROUND.

DAS

Nearby

Flash Flood Warnings in Nebraska, 1998Every flash flood warning in 1998

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.