Alert archive / Nebraska / Flash Flood Warnings in 1998

Flash Flood Warning 30, NWS Omaha, NE

July 29, 1998Saline County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jul 29, 1998, 7:25 PM CDT for Saline County, Nebraska. It was in force for 5 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 29, 1998, 7:25 PM CDT (00:25 UTC)
Expired
Jul 30, 1998, 12:30 AM CDT
In force
5 hr
Issued by
NWS Omaha, NE
Area
Whole counties

County Saline County, NE

The radar

The Omaha radar (KOAX), 110 km from the middle of the area, began a volume at 00:25 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, 0.4 hours before the alert went out and 110 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 1998-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 150 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 1998-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
150 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1120 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 300026
FFWOMA
NEC151-300530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
725 PM CDT WED JUL 29 1998

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SALINE COUNTY IN SOUTHEASTERN NEBRASKA

* UNTIL 1230 AM CDT

* AT 725 PM CDT...RADAR INDICATED THREE TO FOUR INCHES OF RAIN HAD
  FALLEN IN CENTRAL SALINE COUNTY SINCE 430 PM.  MORE STORMS WITH
  ADDITIONAL RAIN SHOULD MOVE ACROSS THE AREA FROM THE WEST YET
  THIS EVENING.

SOME STREAMS AFFECTED INCLUDE...THE SMALL TRIBUTARIES OF TURKEY
CREEK...THE SMALL TRIBUTARIES OF THE BIG BLUE RIVER.

IF WIDESPREAD HEAVY RAIN CONTINUES TO FALL...A FLOOD WARNING MAY
BE ISSUED SPECIFICALLY FOR TURKEY CREEK.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.  THE WATER
DEPTH MAY BE TOO GREAT TO ALLOW YOUR VEHICLE TO CROSS SAFELY.

MILLER

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.

In the hours before

Special weather statement, Jul 29, 4:50 PM CDT, 2 hours 35 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-301200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
450 PM CDT WED JUL 29 1998

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING AND TONIGHT IN
PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA.  THE RISK AREA IS
GENERALLY SOUTHWEST OF A LINE FROM ALBION TO NEBRASKA CITY.

DISCUSSION...
A NEARLY STATIONARY FRONT ALONG THE NEBRASKA/KANSAS BORDER WILL BE
THE FOCAL POINT FOR STRONG THUNDERSTORMS INTO THURSDAY.  THESE STORMS
COULD PRODUCE HEAVY RAIN IN PARTS OF EASTERN NEBRASKA AND SOUTHWEST
IOWA.  THERE IS A SLIGHT CHANCE THAT SOME OF THE STORMS COULD BECOME
SEVERE...PRODUCING STRONG WINDS AND HAIL UP TO AROUND ONE INCH IN
DIAMETER.

AGAIN...THE MAIN THREAT FROM THUNDERSTORMS OVERNIGHT IS HEAVY RAIN...
WHICH COULD PRODUCE LOC&AL FLOODING.

MILLER
Special weather statement, Jul 29, 4:50 PM CDT, 2 hours 35 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-301200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
450 PM CDT WED JUL 29 1998

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING AND TONIGHT IN
PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA.  THE RISK AREA IS
GENERALLY SOUTHWEST OF A LINE FROM ALBION TO NEBRASKA CITY.

DISCUSSION...
A NEARLY STATIONARY FRONT ALONG THE NEBRASKA/KANSAS BORDER WILL BE
THE FOCAL POINT FOR STRONG THUNDERSTORMS INTO THURSDAY.  THESE STORMS
COULD PRODUCE HEAVY RAIN IN PARTS OF EASTERN NEBRASKA AND SOUTHWEST
IOWA.  THERE IS A SLIGHT CHANCE THAT SOME OF THE STORMS COULD BECOME
SEVERE...PRODUCING STRONG WINDS AND HAIL UP TO AROUND ONE INCH IN
DIAMETER.

AGAIN...THE MAIN THREAT FROM THUNDERSTORMS OVERNIGHT IS HEAVY RAIN...
WHICH COULD PRODUCE LOC&AL FLOODING.

MILLER

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; radar from the NEXRAD Level II archive.