Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 301, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Oct 14, 1998, 4:18 PM CDT for Marshall County, Iowa. It was in force for 32 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
- Oct 14, 1998, 4:18 PM CDT (21:18 UTC)
- Expired
- Oct 14, 1998, 4:50 PM CDT
- In force
- 32 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Marshall County, IA
The radar
The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 21:17 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 |
|---|---|---|---|
| Oct 14, 4:20 PM CDT | Hail 0.75 | Haverhill, IA | |
| Oct 14, 4:30 PM CDT | Hail 1 | Melbourne, 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 nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.3 hours before the alert went out and 212 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
- 1560 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
944 WUUS1 KDSM 142119 RRA SVRDSM IAC127-142150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 418 PM CDT WED OCT 14 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MARSHALL COUNTY IN CENTRAL IOWA * UNTIL 450 PM CDT * AT 417 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 33 MILES NORTHEAST OF DES MOINES OR 2 MILES WEST OF MELBOURNE... MOVING EAST AT 30 MPH. * THIS STORM CAN BE EXPECTED NEAR... MELBOURNE BY 421 PM CDT HAVERHILL BY 436 PM CDT LAUREL BY 440 PM CDT MARSHALLTOWN BY 442 PM CDT FERGUSON BY 446 PM CDT THIS IS A DANGEROUS STORM THAT WILL LIKELY PRODUCE LARGE HAIL STAY INDOORS AWAY FROM WINDOWS. CC/BSS
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Local storm report, Oct 14, 2:27 PM CDT, 1 hour 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
227 PM CDT WED OCT 14 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0110 PM 5 SW MANSON IA .75 INCH HAIL
10/14/98 CALHOUN MOSTLY MARBLE SIZE WITH A
FEW THREE QUARTER INCH
STONESThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 14, 1:24 PM CDT | Severe Thunderstorm Warning | DMX | Webster | 31 min |
| Oct 14, 1:26 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 34 min |
| Oct 14, 3:49 PM CDT | Tornado Warning | DMX | Marshall | 16 min |
| Oct 14, 4:51 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 34 min |
| Oct 14, 5:21 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 34 min |
| Oct 14, 6:58 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 32 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.