Alert archive / Iowa / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 58, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 4, 1999, 2:20 PM CDT for Davis County, Iowa. It was in force for 50 min. 3 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
- Jun 4, 1999, 2:20 PM CDT (19:20 UTC)
- Expired
- Jun 4, 1999, 3:10 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Davis County, IA
The radar
The Des Moines radar (KDMX), 155 km from the middle of the area, began a volume at 19:23 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 |
|---|---|---|---|
| Jun 4, 2:30 PM CDT | Hail 0.75 | Bloomfield, IA | |
| Jun 4, 2:35 PM CDT | Thunderstorm Wind 52 | Belknap, IA | |
| Jun 4, 2:35 PM CDT | Hail 0.75 | Stiles, 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 |
|---|---|---|---|
| Jun 4, 10:00 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.3 hours before the alert went out and 187 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
- 1356 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 4, 2:15 PM CDT, 5 minutes earlier.
Area forecast discussion, Jun 4, 2:15 PM CDT, 5 minutes before
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Local storm report, Jun 4, 12:55 PM CDT, 1 hour 25 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 5:46 AM CDT | Severe Thunderstorm Warning | DMX | Audubon | 34 min |
| Jun 4, 9:05 AM CDT | Severe Thunderstorm Warning | DMX | Carroll | 30 min |
| Jun 4, 9:22 AM CDT | Severe Thunderstorm Warning | DMX | Carroll | 43 min |
| Jun 4, 11:50 AM CDT | Severe Thunderstorm Warning | DMX | Madison | 35 min |
| Jun 4, 11:52 AM CDT | Severe Thunderstorm Warning | DMX | Tama | 48 min |
| Jun 4, 12:04 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Warren | 46 min |
| Jun 4, 12:28 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 27 min |
| Jun 4, 12:38 PM CDT | Severe Thunderstorm Warning | DMX | Marion | 32 min |
| Jun 4, 12:41 PM CDT | Tornado Warning | DMX | Lucas | 49 min |
| Jun 4, 12:59 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 51 min |
| Jun 4, 1:27 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Monroe | 48 min |
| Jun 4, 1:44 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 46 min |
| Jun 4, 2:00 PM CDT | Severe Thunderstorm Warning | DMX | Wapello | 35 min |
| Jun 4, 2:07 PM CDT | Severe Thunderstorm Warning | DMX | Wayne | 48 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1999Every severe thunderstorm warning in 1999
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.