Alert archive / Iowa / Tornado Warnings in 1998
Tornado Warning 30, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at May 30, 1998, 12:46 PM CDT for Calhoun County, Greene County, Iowa. It was in force for 34 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
- May 30, 1998, 12:46 PM CDT (17:46 UTC)
- Expired
- May 30, 1998, 1:20 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Calhoun County, IA, Greene County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 30, 12:59 PM CDT | Hail 2.75 | Lake City, IA | |
| May 30, 1:05 PM CDT | Hail 1.75 | Jefferson, IA | Wind gusts to 50 MPH. |
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 |
|---|---|---|---|
| May 30, 12:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 5.8 hours before the alert went out and 183 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
- 1795 J/kg
- Mixed-layer CIN
- -289 J/kg
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 301746 RRA TORDSM IAC025-073-301820- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1246 PM CDT SAT MAY 30 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN CALHOUN COUNTY IN WEST CENTRAL IOWA NORTHERN GREENE COUNTY IN WEST CENTRAL IOWA * UNTIL 120 PM CDT * AT 1246 PM CDT... THE PUBLIC REPORTED A TORNADO 23 MILES SOUTH SOUTHWEST OF FORT DODGE OR 8 MILES WEST NORTHWEST OF PATON MOVING EAST SOUTHEAST AT 40 MPH. * THIS TORNADO CAN BE EXPECTED NEAR... PATON BY 1245 PM CDT DANA BY 1248 PM CDT GRAND JUNCTION BY 1250 PM CDT A TORNADO IS ON THE GROUND! GO TO THE BASEMENT! IF A BASEMENT IS NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! FAB
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 11:39 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 51 min |
| May 30, 12:10 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 50 min |
| May 30, 12:38 PM CDT | Severe Thunderstorm Warning | DMX | Greene, Webster | 47 min |
| May 30, 1:05 PM CDT | Severe Thunderstorm Warning | DMX | Boone | 50 min |
| May 30, 1:25 PM CDT | Tornado Warning | DMX | Boone | 35 min |
| May 30, 1:34 PM CDT | Severe Thunderstorm Warning | DMX | Story | 51 min |
| May 30, 1:50 PM CDT | Tornado Warning | DMX | Boone | 50 min |
| May 30, 2:12 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 48 min |
| May 30, 2:20 PM CDT | Tornado Warning | DMX | Marshall | 50 min |
| May 30, 2:52 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 48 min |
| May 30, 3:08 PM CDT | Tornado Warning | DMX | Marshall | 22 min |
| May 30, 3:08 PM CDT | Tornado Warning | DMX | Marshall | 17 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.