Alert archive / Iowa / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 87, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 12, 1999, 6:51 PM CDT for Cedar County, Iowa. It was in force for 34 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
- Jun 12, 1999, 6:51 PM CDT (23:51 UTC)
- Expired
- Jun 12, 1999, 7:25 PM CDT
- In force
- 34 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Cedar County, IA
The radar
The Quad Cities radar (KDVN), 49 km from the middle of the area, began a volume at 23:52 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 nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.9 hours before the alert went out and 55 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
- 195 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 1089 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 3:13 PM CDT, 3 hours 38 minutes earlier.
Area forecast discussion, Jun 12, 3:13 PM CDT, 3 hours 38 minutes before
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</html>In the hours before
Local storm report, Jun 12, 1:35 PM CDT, 5 hours 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
135 PM CDT SAT JUN 12 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
100 PM 6 N MT. PLEASANT IA FUNNEL CLOUD
06/12/99 HENRY
103 PM N OF MT. PLEASANT IA TORNADO
06/12/99 HENRY
106 PM S OF SWEDESBURG IA TORNADO
06/12/99 HENRY
110 PM NEAR SWEDESBURG IA TORNADO
06/12/99 HENRYThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:00 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Linn | 60 min |
| Jun 11, 9:49 PM CDT | Flash Flood Warning | DVN | Benton, Iowa, Linn | 3 hr |
| Jun 12, 1:06 PM CDT | Tornado Warning | DVN | Henry | 34 min |
| Jun 12, 6:35 PM CDT | Severe Thunderstorm Warning | DVN | Clinton | 35 min |
| Jun 12, 2:11 PM CDT | Tornado Warning | DVN | Whiteside | 34 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.