Alert archive / Iowa / Tornado Warnings in 1999
Tornado Warning 2, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Apr 8, 1999, 6:13 PM CDT for Jefferson County, Iowa. It was in force for 47 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
- Apr 8, 1999, 6:13 PM CDT (23:13 UTC)
- Expired
- Apr 8, 1999, 7:00 PM CDT
- In force
- 47 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Jefferson County, IA
The radar
The Quad Cities radar (KDVN), 131 km from the middle of the area, began a volume at 23:15 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 |
|---|---|---|---|
| Apr 8, 6:25 PM CDT | Tornado F0 | Batavia, IA | |
| Apr 8, 6:25 PM CDT | Tornado F0 | Pleasant Plain, 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 |
|---|---|---|---|
| Apr 8, 5:15 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.2 hours before the alert went out and 138 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
- 2467 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS1 KMLI 082315 RRA TORMLI IAC101-090000- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 613 PM CDT THU APR 8 1999 THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A * TORNADO WARNING FOR... JEFFERSON COUNTY IN SOUTHEASTERN IOWA * UNTIL 700 PM CDT * AT 614 PM CDT... DOPPLER RADAR AND SPOTTER REPORTS INDICATED A TORNADO 10 MILES SOUTHEAST OF OTTUMWA OR 6 MILES SOUTHWEST OF BATAVIA MOVING NORTHEAST AT 45 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... BATAVIA AROUND 620 PM CDT LIBERTYVILLE AROUND 620 PM CDT ABINGDON AROUND 625 PM CDT FAIRFIELD AROUND 630 PM CDT PEKIN AROUND 635 PM CDT A TORNADO IS ON THE GROUND GO TO THE BASEMENT IF A BASEMENT IS NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR WOLF
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 10:10 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 30 min |
| Apr 8, 5:52 PM CDT | Tornado Warning | DVN | Van Buren | 48 min |
| Apr 8, 6:17 PM CDT | Tornado Warning | DVN | Lee | 48 min |
| Apr 8, 6:33 PM CDT | Tornado Warning | DVN | Keokuk, Washington | 47 min |
Nearby
Tornado Warnings in Iowa, 1999Every tornado warning in 1999Tornadoes 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.