Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 67, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 29, 1998, 7:09 PM CDT for Macoupin County, Illinois. It was in force for 61 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 29, 1998, 7:09 PM CDT (00:09 UTC)
- Expired
- Apr 29, 1998, 8:10 PM CDT
- In force
- 61 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Macoupin County, IL
The radar
The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 00:09 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 |
|---|---|---|---|
| Apr 29, 7:22 PM CDT | Hail 0.75 | Brighton, IL | Amateur radio spotters reported 3/4 inch hail. |
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 nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 267 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
- 2 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
966 WUUS1 KSTL 300010 RRA SVRSTL ILC117-300110- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 709 PM CDT WED APR 29 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 810 PM CDT * AT 705 PM CDT...SEVERE STORM SPOTTERS INDICATED A SEVERE THUNDERSTORM NEAR BRIGHTON IL... MOVING NORTHEAST AT 25 MILES AN HOUR. * LOCATIONS THAT WILL BE AFFECTED... NEAR CARLINVILLE AT 730 PM CDT 3/4 INCH HAIL NEAR BRIGHTON AT 655 PM CDT THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY. TPS &
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 29, 5:04 PM CDT, 2 hours 5 minutes before
ILZ058-059-292300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 504 PM CDT WED APR 29 1998 AT 5 PM...THE ST LOUIS WEATHER RADAR INDICATED A STORM NEAR GREENFIELD IN GREEN COUNTY ILLINOIS...THIS STORM WAS MOVING TO THE NORTHEAST AT 30 MPH AND WILL HIT THE CITY OF PALMYRA BY 515 PM. THIS STORM WILL CONINUE TO PRODUCE HEAVY RAIN AND SMALL HAIL.
Special weather statement, Apr 29, 5:04 PM CDT, 2 hours 5 minutes before
ILZ058-059-292300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 504 PM CDT WED APR 29 1998 AT 5 PM...THE ST LOUIS WEATHER RADAR INDICATED A STORM NEAR GREENFIELD IN GREEN COUNTY ILLINOIS...THIS STORM WAS MOVING TO THE NORTHEAST AT 30 MPH AND WILL HIT THE CITY OF PALMYRA BY 515 PM. THIS STORM WILL CONINUE TO PRODUCE HEAVY RAIN AND SMALL HAIL.
Special weather statement, Apr 29, 5:30 PM CDT, 1 hour 39 minutes before
ILZ099-100-MOZ061-063-300000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 530 PM CDT WED APR 29 1998 AT 530 PM...THE ST LOUIS WEATHER RADAR INDICATED A LINE OF STRONG THUNDERSTOMRS FROM ST CHARLES TO PORTAGE DES SIOUX IN ST CHARLES COUNTY. VERY HEAVY RAIN AND SMALL HAIL WILL ACCOMPANY THE STORMS. PERSONS IN ST CHARLES...PORTAGE DES SIOUX...BRIGHTON...AND MEDORA MAY EXPERIENCE SMALL HAIL AND HEAVY RAIN BETWEEN 530 PM AND 615 PM. THE STORMS WERE MOVING TO THE NORTHEAST AROUND 25 MILES AN HOUR.
Nearby
Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning 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.