Alert archive / Nebraska / Flash Flood Warnings in 1998
Flash Flood Warning 8, NWS Omaha, NE
NWS Omaha, NE issued this flash flood warning at Jun 11, 1998, 9:34 AM CDT for Washington 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
- Jun 11, 1998, 9:34 AM CDT (14:34 UTC)
- Expired
- Jun 11, 1998, 1:35 PM CDT
- In force
- 4 hr
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Washington County, NE
The radar
The Omaha radar (KOAX), 26 km from the middle of the area, began a volume at 14:34 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 12:00Z, 2.6 hours before the alert went out and 27 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1818 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOMA 111435 FFWOMA NEC177-111835- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 934 AM CDT THU JUN 11 1998 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * FLASH FLOOD WARNING FOR... WASHINGTON COUNTY IN EAST CENTRAL NEBRASKA * UNTIL 135 PM CDT * AT 930 AM CDT... RAIN AND THUNDERSTORMS HAVE PRODUCED NEARLY TWO INCHES OF RAIN IN THE UPPER REACHES OF THE BELL CREEK BASIN IN WASHINGTON COUNTY. SOME GENERAL AGRICULTURAL LOWLAND FLOODING HAS BEEN REPORTED ALONG THE BELL CREEK. ADDITIONAL MODERATE TO HEAVY RAIN WILL CONTINUE OVER WASHINGTON COUNTY INTO EARLY AFTERNOON BEFORE ENDING...THUS FLOODING MAY BECOME MORE WIDESPREAD. SOME STREAMS AFFECTED INCLUDE...BELL 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. DAS
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 11, 3:29 AM CDT, 6 hours 5 minutes earlier.
Area forecast discussion, Jun 11, 3:29 AM CDT, 6 hours 5 minutes before
CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION...CORRECTED CCF NATIONAL WEATHER SERVICE HASTINGS NE 329 AM CDT THU JUN 11 1998 ...TYPICAL JUNE FORECAST CONCERNS CENTERED ON THUNDERSTORMS AND TEMPERATURES... 00Z UPPER AIR ANALYSIS REVEALED 300MB JET MAX ACROSS SDAK. WEAKENING AREA OF SHOWERS/THUNDERSTORMS ASSOCIATED WITH RRQ OF THIS JET MAX JUST NW OF GID CWA ATTM...MOVING NE. PROFILERS SHOW 500 MB SHORT WAVE MOVING NE ACROSS NRN KS. HIGH BASED SHOWERS ALONG KS/NEB BDR ARE MOVING NE AHEAD OF IT. THIS APPEARS TO BE RIGHT ON WARM FRONT FROM 06Z SFC ANALYSIS. ADAP/LAPS DATA SHOW BEST MSTR CONVERGENCE/HIGHEST CAPES AND LEAST INHIBITION LOCATED OVER SE NEBRASKA. LATEST RUC SHOWS 250 MB JET MAX POSITIONING SHIFTING SO THAT THIS AREA WILL BE IN RRQ THIS MORNING. THEREFORE WILL GO WITH HIGHEST POPS OVER SE FA FOR THIS MORNING. REMNANTS OF WC NEBR CONVECTION COULD STREAM ACROSS NRN COUNTIES AS WELL. OTHERWISE...IR SHOWS THAT A PERIOD OF DRYING MAY OCCUR OVER SW FA IN BTWN WAVES. NEXT WAVE SHOWING UP OVER ERN NEW MEXICO...PRETTY MUCH IN LINE WITH NGM/AVN WHICH HAVE BEEN BEST OF WHAT WE HAVE TO WORK WITH OF LATE. ONE LOBE OF NRN STREAM WAVE SWINGING SE OUT OF DAKS WILL ALSO CROSS FA LATER TODAY. QUESTION IS WHETHER SHORT WAVE COMBO WILL HAVE MUCH LOW LVL MSTR TO WORK WITH WHEN THEY PASS THRU. MODEL PROGS ARE TRYING TO PUSH WEST WINDS AND DRYING THRU AREA THIS AFTN. SUSPECT DRYING IS OVERDONE AS USUAL AND WILL OPT FOR AT LEAST SOME POPS OVER ENTIRE AREA THIS AFTN AND INTO THE EVENING OVER EXTREME EAST. MAIN ENERGY FROM NRN STREAM EXPECTED TO PASS NRN OF GID CWA OVERNIGHT WITH TSTMS REMAINING NE OF AREA AT THAT TIME. TEMP WISE...SHOULD FINALLY SEE SOME WARM UP TODAY...EPSLY WEST WHERE MOST SUN TO OCCUR. MODELS STILL INDICATE FAIRLY TRANQUIL WEATHER FRIDAY AS SHORT WAVE RIDING BEGINS. WITH ABUNDANT SUN...WILL PUSH TEMPS UP ANOTHER NOTCH TO NEW GUID LVLS. GRI TU 079/058/085/060/085 420 KD
In the hours before
Special weather statement, Jun 11, 5:04 AM CDT, 4 hours 30 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-121200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 505 AM CST THU JUN 11 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND THIS EVENING IN EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... OCCASIONAL THUNDERSTORMS ARE LIKELY IN EASTERN NEBRASKA AND SOUTHWEST IOWA TODAY AS A WARM FRONT LIFTING NORTHEAST THROUGH NORTHEAST NEBRASKA AND SOUTHWEST IOWA THIS MORNING AND A COOL FRONT MOVING EAST ACROSS CENTRAL NEBRASKA INTERACT WITH AN UNSTABLE AND MOIST AIR MASS. IN ADDITION A DISTURBANCE IN THE UPPER ATMOSPHERE WILL ALSO PROVIDE FURTHER FORCING AND SUPPORT FOR THUNDERSTORMS. AS A RESULT OF EXPECTED INSTABILITY...SOME OF THE STORMS MAY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS. IN ADDITION... DUE TO THE VERY MOIST NATURE OF THE ATMOSPHERE...AREAS OF HEAVY RAINFALL MAY OCCUR. BY LATER THIS AFTERNOON AND EVENING THE MAIN THREAT FOR THUNDERSTORMS WILL SHIFT INTO SOUTHEAST NEBRASKA AND SOUTHWEST IOWA AS THE COOL FRONT MOVES EAST. GW
Special weather statement, Jun 11, 6:05 AM CDT, 3 hours 29 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-121200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 505 AM CST THU JUN 11 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND THIS EVENING IN EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... OCCASIONAL THUNDERSTORMS ARE LIKELY IN EASTERN NEBRASKA AND SOUTHWEST IOWA TODAY AS A WARM FRONT LIFTING NORTHEAST THROUGH NORTHEAST NEBRASKA AND SOUTHWEST IOWA THIS MORNING AND A COOL FRONT MOVING EAST ACROSS CENTRAL NEBRASKA INTERACT WITH AN UNSTABLE AND MOIST AIR MASS. IN ADDITION A DISTURBANCE IN THE UPPER ATMOSPHERE WILL ALSO PROVIDE FURTHER FORCING AND SUPPORT FOR THUNDERSTORMS. AS A RESULT OF EXPECTED INSTABILITY...SOME OF THE STORMS MAY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS. IN ADDITION... DUE TO THE VERY MOIST NATURE OF THE ATMOSPHERE...AREAS OF HEAVY RAINFALL MAY OCCUR. BY LATER THIS AFTERNOON AND EVENING THE MAIN THREAT FOR THUNDERSTORMS WILL SHIFT INTO SOUTHEAST NEBRASKA AND SOUTHWEST IOWA AS THE COOL FRONT MOVES EAST. GW
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 11:45 PM CDT | Flash Flood Warning | OAX | Washington | 4 hr |
| Jun 11, 6:17 PM CDT | Severe Thunderstorm Warning | OAX | Cedar, Pierce, Wayne | 48 min |
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.