Alert archive / Iowa / Tornado Warnings in 1998
Tornado Warning 60, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 6, 1998, 10:00 PM CDT for Marion County, Iowa. It was in force for 35 min. 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 6, 1998, 10:00 PM CDT (03:00 UTC)
- Expired
- Jul 6, 1998, 10:35 PM CDT
- In force
- 35 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Marion County, IA
The radar
The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 03:00 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 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, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 3.0 hours before the alert went out and 219 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
- 1624 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1080 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 070300 RRA TORDSM IAC125-070335- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1000 PM CDT MON JUL 6 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * TORNADO WARNING FOR... MARION COUNTY IN SOUTH CENTRAL IOWA * UNTIL 1035 PM CDT * AT 958 PM CDT... DOPPLER RADAR INDICATED A DEVELOPING TORNADO 15 MILES EAST SOUTHEAST OF DES MOINES OR 3 MILES NORTH NORTHWEST OF SWAN MOVING EAST SOUTHEAST AT 35 MPH. * THIS TORNADO CAN BE EXPECTED NEAR... SWAN NOW PLEASANTVILLE BY 1014 PM CDT OTLEY BY 1019 PM CDT KNOXVILLE BY 1020 PM CDT RED ROCK RESERVOIR BY 1021 PM CDT GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! JOHNSON/BS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 7:22 PM CDT | Tornado Warning | DMX | Carroll | 33 min |
| Jul 6, 8:15 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie | 35 min |
| Jul 6, 8:46 PM CDT | Flash Flood Warning | DMX | Dallas | 3 hr |
| Jul 6, 8:54 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Polk | 36 min |
| Jul 6, 9:14 PM CDT | Flash Flood Warning | DMX | Guthrie | 6 hr |
| Jul 6, 9:20 PM CDT | Severe Thunderstorm Warning | DMX | Story | 35 min |
| Jul 6, 9:21 PM CDT | Flash Flood Warning | DMX | Polk | 6 hr |
| Jul 6, 9:29 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk | 46 min |
| Jul 6, 9:35 PM CDT | Tornado Warning | DMX | Polk | 35 min |
| Jul 6, 9:45 PM CDT | Severe Thunderstorm Warning | DMX | Marion, Warren | 45 min |
| Jul 6, 10:15 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 35 min |
| Jul 6, 10:37 PM CDT | Severe Thunderstorm Warning | DMX | Marion | 33 min |
| Jul 6, 11:41 PM CDT | Flash Flood Warning | DMX | Dallas | 3 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.