Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 73, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 5, 1999, 5:36 PM CDT for Marion County, Illinois. It was in force for 49 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
- May 5, 1999, 5:36 PM CDT (22:36 UTC)
- Expired
- May 5, 1999, 6:25 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Marion County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 5, 5:43 PM CDT | Hail 1.75 | Kell, IL | |
| May 5, 5:45 PM CDT | Hail 0.75 | Iuka, IL | |
| May 5, 6:05 PM CDT | Tornado F1 | Kell, IL |
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 5, 3:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 169 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
- 49 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 208 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KSTL 052237 RRA SVRSTL ILC121-052325- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 536 PM CDT WED MAY 5 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN MARION COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS * UNTIL 625 PM CDT * AT 530 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR THE TOWN OF KELL ILLINOIS... THIS STORM WAS MOVING NORTHEAST AT 35 MPH. * LOCATIONS THAT WILL BE AFFECTED... KELL HELM OTHER RURAL COMMUNITIES IN SOUTHEAST MARION COUNTY 1.5 INCH DIAMETER HAIL WAS REPORTED BY THE ILLINOIS STATE POLICE AT 530 PM 5 MILES WEST OF MT. VERNON ON INTERSTATE 64. THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY FROM WINDOWS. JP/TES &
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 2:03 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 47 min |
| May 5, 5:24 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 36 min |
| May 5, 6:11 PM CDT | Tornado Warning | LSX | Marion | 49 min |
| May 5, 6:16 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 34 min |
| May 5, 6:23 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 47 min |
Nearby
Severe 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.