Alert archive / Iowa / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 117, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 23, 1999, 3:49 PM CDT for Scott County, Iowa; Rock Island County, Illinois. It was in force for 46 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
- Aug 23, 1999, 3:49 PM CDT (20:49 UTC)
- Expired
- Aug 23, 1999, 4:35 PM CDT
- In force
- 46 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Scott County, IA, Rock Island County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 23, 4:00 PM CDT | Hail 0.75 | Pleasant Vly, IA | |
| Aug 23, 4:20 PM CDT | Thunderstorm Wind 52 | Rock Is, IL | Several trees downed on 45th and 10th streets. |
| Aug 23, 4:30 PM CDT | Thunderstorm Wind 52 | Barstow, IL | Power poles downed. |
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 |
|---|---|---|---|
| Aug 23, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 11 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
- 1307 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 108 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.
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 1:08 PM CDT | Severe Thunderstorm Warning | DVN | Delaware | 47 min |
| Aug 23, 1:37 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 63 min |
| Aug 23, 3:15 PM CDT | Severe Thunderstorm Warning | DVN | Muscatine | 50 min |
| Aug 23, 4:47 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry | 48 min |
| Aug 23, 5:06 PM CDT | Severe Thunderstorm Warning | DVN | Henderson, Warren | 49 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1999Severe Thunderstorm Warnings in Illinois, 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.