Alert archive / Illinois / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 20, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 26, 1989, 8:47 PM CDT for Brown County, Illinois. It was in force for 28 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
- Apr 26, 1989, 8:47 PM CDT (01:47 UTC)
- Expired
- Apr 26, 1989, 9:15 PM CDT
- In force
- 28 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Brown County, IL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 26, 9:05 PM CDT | Thunderstorm Wind 0 | Brown, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 00:00Z, 1.8 hours before the alert went out and 125 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
- 1526 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
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.
In the hours before
Special weather statement, Apr 26, 7:58 PM CDT, 49 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 750 PM CDT WED APR 26 1989 ...TORNADO WATCH REMAINS IN EFFECT UNTIL 11 PM FOR EXTREME NORTH MISSOURI... AT 750 PM...THE SHERIFFS OFFICE IN CAHOKA IN CLARK COUNTY IN NORTHEAST MISSOURI REPORTED A STRONG THUNDERSTORM WITH STRONG WINDS. NO REPORTS OF SEVERE WEATHER HAVE BEEN REPORTED TO THE NATIONAL WEATHER SERVICE AT THIS TIME. PERSONS IN CLARK COUNTY SHOULD REMAIN ALE:RT FOR THE POSSIBILITY OF SEVERE WEATHER THIS EVENING. A FEW OF THESE THUNDERSTORMS WERE SEVERE AS THEY MOVED ACROSS IOWA. THE WEATHER OFFICE IN PEORIA REPORTED A WIND GUST TO 69 MPH AT 750 PM.
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:28 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Pike, Ralls | 32 min |
| Apr 26, 11:01 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 44 min |
| Apr 26, 11:08 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 52 min |
| Apr 27, 6:36 PM CDT | Tornado Warning | LSX | Clark | 69 min |
| Apr 26, 8:39 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 36 min |
| Apr 26, 10:32 PM CDT | Tornado Warning | LSX | Greene | 28 min |
| Apr 26, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 28 min |
| Apr 26, 10:57 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Madison | 33 min |
| Apr 26, 10:57 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 33 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1989Every severe thunderstorm warning in 1989
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.