Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 21, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Mar 30, 1998, 7:34 PM CST for Des Moines County, Henry County, Iowa. It was in force for 46 min. 1 report 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
- Mar 30, 1998, 7:34 PM CST (01:34 UTC)
- Expired
- Mar 30, 1998, 8:20 PM CST
- In force
- 46 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Des Moines County, IA, Henry County, IA
The radar
The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 01:37 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 |
|---|---|---|---|
| Mar 30, 7:58 PM CST | Hail 0.75 | Yarmouth, 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 |
|---|---|---|---|
| Mar 30, 3:45 PM CST | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 103 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
- 226 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 1587 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
755 WUUS1 KMLI 310135 RRA SVRMLI IAC057-087-310220- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 734 PM CST MON MAR 30 1998 * SEVERE THUNDERSTORM WARNING FOR DES MOINES COUNTY - SOUTHEASTERN IOWA SOUTHERN HENRY COUNTY IOWA - SOUTHEASTERN IOWA * UNTIL 820 PM CST * SOME LOCATIONS AFFECTED BY THIS STORM LOWELL AROUND 740 PM CST GEODE STATE PARK AROUND 740 PM CST MT PLEASANT AROUND 740 PM CST NEW LONDON AROUND 745 PM CST DANVILLE AROUND 750 PM CST * AT 730 PM CST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 18 MILES NORTHWEST OF FT MADISON OR 7 MILES WEST OF LOWELL MOVING NORTHEAST AT 45 MPH. THIS IS A DANGEROUS STORM STAY INDOORS AND AWAY FROM WINDOWS. JDH
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 6:18 PM CST | Severe Thunderstorm Warning | DVN | Jefferson | 32 min |
| Mar 30, 6:56 PM CST | Severe Thunderstorm Warning | DVN | Lee, Van Buren | 44 min |
| Mar 30, 7:48 PM CST | Severe Thunderstorm Warning | DVN | Cedar | 47 min |
| Mar 30, 8:18 PM CST | Tornado Warning | DVN | Clinton | 47 min |
| Mar 30, 8:33 PM CST | Tornado Warning | DVN | Jackson | 47 min |
| Mar 30, 8:36 PM CST | Severe Thunderstorm Warning | DVN | Lee | 49 min |
| Mar 31, 3:50 PM CST | Severe Thunderstorm Warning | DVN | Scott | 35 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.