Alert archive / Nebraska / Flash Flood Warnings in 1998
Flash Flood Warning 7, NWS Omaha, NE
NWS Omaha, NE issued this flash flood warning at Jun 10, 1998, 11:45 PM CDT for Washington County, Nebraska; Harrison County, Iowa. 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 10, 1998, 11:45 PM CDT (04:45 UTC)
- Expired
- Jun 11, 1998, 3:45 AM CDT
- In force
- 4 hr
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Harrison County, IA, Washington County, NE
The radar
The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 04:49 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, 4.8 hours before the alert went out and 43 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
- 900 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 884 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOMA 110446 FFWOMA IAC085-NEC177-110845- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1145 PM CDT WED JUN 10 1998 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * FLASH FLOOD WARNING FOR... WASHINGTON COUNTY IN EAST CENTRAL NEBRASKA HARRISON COUNTY IN SOUTHWESTERN IOWA * UNTIL 345 AM CDT * AT 1140 PM CDT... RADAR INDICATES HEAVY RAINS OF 1 TO OVER 2 INCHES HAVE FALLEN FROM NORTH OF ARLINGTON NEBRASKA TO NEAR WOODBINE IOWA. THUNDERSTORMS CONTINUE TO DEVELOP OVER THIS AREA. SOME STREAMS AFFECTED INCLUDE...STEEL AND WILLOW CREEKS AND THE BOYER RIVER IN HARRISON COUNTY THE BIG PAPILLION CREEK HEADWATERS IN WASHINGTON COUNTY. DO NOT DRIVfE INTO AREAS WHERE WATER COVERS THE ROAD. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR VEHICLE TO CROSS SAFELY. POWERS
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 10, 4:00 AM CDT, 19 hours 45 minutes earlier.
Area forecast discussion, Jun 10, 4:00 AM CDT, 19 hours 45 minutes before
CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HASTINGS NE 4 AM CDT WED JUN 10 1998 THUNDERSTORMS/SHOWERS MOVG OUT OF ERN CWA IN ASSOC WITH MID LEVEL WAVE IN CNTRL NEB THIS MORNING. THIS WAVE SHOULD MOVE OUT OF THE CWA CLOSE TO SR. THEREFORE...BROKE UP ERN CWA ZONES TO ACCOMODATE ACTIVE WX...AND WILL UPDATE LATER AS SITUATION CHANGES. MODELS AGAIN SORT OF IN DISARRAY AS TO BEST HANDLING OF FCST. NGM/AVN SHOWING DECENT DYNAMICS FOR THUNDSTORMS THURSDAY MORNING WHILE ETA NOT AS HARD. NGM/ANN GIVE BEST DYNAMICS AROUND 12Z THU WHILE THE ETA IS A BIT MORE SUBDUED. WITH WV IMAGE SHOWING VORT MOVG OUT OF SW THIS MORNING...NGM/AVN SOLUTION FOR PCPN FOR 12Z THU MAY NOT BE TOO FAR OFF. BY THU AFTN...NGM INCR 1000-500 MB MOISTURE ACROSS CWA AND FWC HIGH TEMPS DROP INTO THE L70S. THE ETA/AVN MEANWHILE GO THE OTHER WAY AND DECRS RH'S AND THE ETA SHOOTS HIGHS INTO THE L80S. PREFERRED THE DRIER ETA/AVN SOL BY 00Z FRI ON THIS SO WENT PCLDY AND MUCH ABOVE FWC AFTN HIGHS. GRI BB 083/064/084/065/086 233 DEE
In the hours before
Special weather statement, Jun 10, 5:47 PM CDT, 5 hours 58 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-111200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 540 PM CST WED JUN 10 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS EVENING OR TONIGHT IN PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... THUNDERSTORM ACTIVITY DURING THE DAY HAS REINFORCED A COOL FRONT RUNNING EAST/WEST ACROSS NORTHERN KANSAS. AS A RESULT...THE ATMOSPHERE OVER EAST CENTRAL AND SOUTHEAST NEBRASKA AS WELL AS SOUTHWEST IOWA WILL TAKE MUCH OF THE EVENING TO DESTABILIZE. WHILE THUNDERSTORMS ARE LIKELY...ONLY IN THE SOUTHERN COUNTIES OF SOUTHEAST NEBRASKA AND SOUTHWEST IOWA ARE THEY LIKELY TO PRODUCE SEVERE WEATHER. < NORTHEAST NEBRASKA MAY ALSO SEE THUNDERSTORMS. THE COUNTIES ALONG THE SOUTH DAKOTA BORDER WOULD BE MOST LIKELY TO SEE SEVE0RE WEATHER FROM THESE STORMS. THROUGHOUT THE AREA THERE IS A THREAT OF LOCALLY HEAVY RAINS FROM ANY THUNDERSTORMS WHICH DO DEVELOP. POWERS
Special weather statement, Jun 10, 6:40 PM CDT, 5 hours 5 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-111200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 540 PM CST WED JUN 10 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS EVENING OR TONIGHT IN PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... THUNDERSTORM ACTIVITY DURING THE DAY HAS REINFORCED A COOL FRONT RUNNING EAST/WEST ACROSS NORTHERN KANSAS. AS A RESULT...THE ATMOSPHERE OVER EAST CENTRAL AND SOUTHEAST NEBRASKA AS WELL AS SOUTHWEST IOWA WILL TAKE MUCH OF THE EVENING TO DESTABILIZE. WHILE THUNDERSTORMS ARE LIKELY...ONLY IN THE SOUTHERN COUNTIES OF SOUTHEAST NEBRASKA AND SOUTHWEST IOWA ARE THEY LIKELY TO PRODUCE SEVERE WEATHER. < NORTHEAST NEBRASKA MAY ALSO SEE THUNDERSTORMS. THE COUNTIES ALONG THE SOUTH DAKOTA BORDER WOULD BE MOST LIKELY TO SEE SEVERE WEATHER FROM THESE STORMS. THROUGHOUT THE AREA THERE IS A THREAT OF LOCALLY HEAVY RAINS FROM ANY THUNDERSTORMS WHICH DO DEVELOP. POWERS
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:34 AM 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, 1998Flash Flood Warnings in Iowa, 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.