Alert archive / Illinois / Tornado Warnings in 1998
Tornado Warning 29, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at May 15, 1998, 8:10 PM CDT for Whiteside County, Illinois. It was in force for 50 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
- May 15, 1998, 8:10 PM CDT (01:10 UTC)
- Expired
- May 15, 1998, 9:00 PM CDT
- In force
- 50 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
County Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 58 km from the middle of the area, began a volume at 01:09 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 |
|---|---|---|---|
| May 15, 8:30 PM CDT | Thunderstorm Wind 56 | Lyndon, IL | Thunderstorm winds downed tree limbs producing light damage in the city of Lyndon. |
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 |
|---|---|---|---|
| May 15, 5:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.2 hours before the alert went out and 210 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
- 3559 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 3.7
- Supercell composite
- 20.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMLI 160110 RRA TORMLI ILC195-160200- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 810 PM CDT FRI MAY 15 1998 THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A * TORNADO WARNING FOR... WHITESIDE COUNTY IN NORTHWESTERN ILLINOIS * UNTIL 900 PM CDT * AT 809 PM CDT... DOPPLER RADAR INDICATED A DEVELOPING TORNADO 19 MILES SOUTHEAST OF CLINTON OR 6 MILES SOUTH OF ROUND GROVE MOVING NORTHEAST AT 40 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... ROUND GROVE AROUND 810 PM CDT AGNEW AROUND 815 PM CDT COMO AROUND 815 PM CDT ROCK FALLS n AROUND 820 PM CDT STERLING AROUND 825 PM CDT GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! WEISSER
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 7:24 PM CDT | Tornado Warning | DVN | Jo Daviess | 36 min |
| May 15, 7:43 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Whiteside | 47 min |
| May 15, 7:53 PM CDT | Severe Thunderstorm Warning | DVN | Bureau | 62 min |
| May 15, 7:57 PM CDT | Tornado Warning | DVN | Henry | 33 min |
| May 15, 8:15 PM CDT | Severe Thunderstorm Warning | DVN | Carroll | 50 min |
| May 15, 8:18 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 47 min |
| May 15, 8:43 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 32 min |
| May 15, 8:50 PM CDT | Severe Thunderstorm Warning | DVN | Putnam | 50 min |
Nearby
Tornado Warnings in Illinois, 1998Every tornado warning in 1998Tornadoes 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.