Alert archive / Iowa / Tornado Warnings in 1998
Tornado Warning 76, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Jul 6, 1998, 6:49 PM CDT for Harrison County, Iowa. It was in force for 61 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 6, 1998, 6:49 PM CDT (23:49 UTC)
- Expired
- Jul 6, 1998, 7:50 PM CDT
- In force
- 61 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Harrison County, IA
The radar
The Omaha radar (KOAX), 61 km from the middle of the area, began a volume at 23:50 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 6, 7:15 PM CDT | Thunderstorm Wind 52 | Little Sioux, IA | Tree limbs downed. |
| Jul 6, 7:20 PM CDT | Thunderstorm Wind 52 | Logan, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 6, 5:15 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 61 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
- 1215 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 979 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
014 WFUS1 KOMA 062350 RRA TOROMA IAC085-070050- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 649 PM CDT MON JUL 6 1998 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * TORNADO WARNING FOR... HARRISON COUNTY IN SOUTHWESTERN IOWA * UNTIL 750 PM CDT * AT 650 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF TORNADIC STORMS FROM NEAR MOOREHEAD IOWA TO NEAR LITTLE SIOUX...OR 40 TO 50 MILES SOUTH OF SIOUX CITY.. MOVEMENT WAS SOUTHEAST AT 30 MPH. A TORNADO WAS REPORTED NEAR BLENCOE IOWA AT 640 PM CDT. SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...LITTLE SIOUX... PISGAH...MONDAMIN...MAGNOLIA AND WOODBINE. TORNADOES MAY OCCUR NEAR THE LEADING EDGE OF THIS STORM AND COULD BE DIFFICULT TO SEE BECAUSE OF THE VERY HEAVY RAIN. TAKE SHELTER ON THE LOWEST LEVEL OF YOUR HOME OR BUSINESS. BCM &
What forecasters said that day
The local office's own words before this tornado 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 6, 4:45 PM CDT, 2 hours 4 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-071200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 445 PM CDT MON JUL 6 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION WILL BE REQUIRED ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA THIS EVENING. DISCUSSION... SEVERE THUNDERSTORMS WERE MOVING INTO NORTHEAST NEBRASKA LATE THIS AFTERNOON WITH A LINE OF STORMS DEVELOPING INTO CENTRAL NEBRASKA. THIS STORM COMPLEX WILL CONTINUE TO MOVE EAST DURING THE EVENING AND IS EXPECTED TO REACH EAST CENTRAL AND SOUTHEAST NEBRASKA AND SOUTHWEST IOWA BETWEEN 7 AND 10 PM. LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREAT WITH ISOLATED TORNADOES POSSIBLE. VERY HEAVY RAIN IS ALSO LIKELY WITH THESE STORMS AND SINCE THE GROUND IS ALREADY SATURATED FROM RAINFALL OVER THE PAST TWO DAYS SMALLER STREAMS AND CRE@EKS WILL TEND TO FLOOD QUICKLY. FOBERT
Special weather statement, Jul 6, 4:45 PM CDT, 2 hours 4 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-071200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 445 PM CDT MON JUL 6 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION WILL BE REQUIRED ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA THIS EVENING. DISCUSSION... SEVERE THUNDERSTORMS WERE MOVING INTO NORTHEAST NEBRASKA LATE THIS AFTERNOON WITH A LINE OF STORMS DEVELOPING INTO CENTRAL NEBRASKA. THIS STORM COMPLEX WILL CONTINUE TO MOVE EAST DURING THE EVENING AND IS EXPECTED TO REACH EAST CENTRAL AND SOUTHEAST NEBRASKA AND SOUTHWEST IOWA BETWEEN 7 AND 10 PM. LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREAT WITH ISOLATED TORNADOES POSSIBLE. VERY HEAVY RAIN IS ALSO LIKELY WITH THESE STORMS AND SINCE THE GROUND IS ALREADY SATURATED FROM RAINFALL OVER THE PAST TWO DAYS SMALLER STREAMS AND CRE@EKS WILL TEND TO FLOOD QUICKLY. FOBERT
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 64 min |
| Jul 6, 6:34 PM CDT | Tornado Warning | OAX | Monona | 61 min |
Nearby
Tornado Warnings in Iowa, 1998Every tornado warning in 1998Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.