Alert archive / Illinois / Tornado Warnings in 1998

Tornado Warning 14, NWS St. Louis, MO

April 13, 1998Jersey County, Macoupin County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 13, 1998, 5:18 PM CDT for Jersey County, Macoupin County, Illinois. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 13, 1998, 5:18 PM CDT (22:18 UTC)
Expired
Apr 13, 1998, 6:00 PM CDT
In force
42 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Jersey County, IL, Macoupin County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 22:19 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 13, 3:45 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 171 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 1998-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 1998-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 337 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1703 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
337 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

620 
WFUS1 KSTL 132218 RRA
TORSTL
ILC117-083-132300-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
518 PM CDT MON APR 13 1998
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  600 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL ILLINOIS
 
   ...SOUTHERN MACOUPIN COUNTY
 
IN SOUTHWEST ILLINOIS
 
   ...SOUTHERN JERSEY COUNTY
 
AT 518 PM...RADAR INDICATED A POSSIBLE TORNADO 4 MILES WEST OF GRAFTON
MOVING EAST NORTHEAST AT 30 MPH. TOWNS IN THE PATH OF THIS STORM INCLUDE
GRAFTON AND BRIGHTON.
 
 
 
THIS IS A DANGEROUS STORM SITUATION. ACT QUICKLY AND SEEK SHELTER
NOW

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 3:20 PM CDTSevere Thunderstorm WarningLSXAdams, Brown40 min
Apr 13, 3:44 PM CDTSevere Thunderstorm WarningLSXPike46 min
Apr 13, 4:57 PM CDTTornado WarningLSXCalhoun48 min
Apr 13, 5:36 PM CDTTornado WarningLSXMadison54 min
Apr 13, 5:42 PM CDTTornado WarningLSXRandolph63 min
Apr 13, 6:04 PM CDTTornado WarningLSXMadison41 min
Apr 13, 6:12 PM CDTTornado WarningLSXMonroe, Saint Clair63 min
Apr 13, 6:25 PM CDTTornado WarningLSXBond65 min
Apr 13, 6:43 PM CDTTornado WarningLSXClinton, Washington62 min
Apr 13, 6:52 PM CDTTornado WarningLSXRandolph68 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.