Alert archive / Missouri / Tornado Warnings in 1998

Tornado Warning 18, NWS St. Louis, MO

April 13, 1998Jefferson County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 13, 1998, 5:56 PM CDT for Jefferson County, Missouri. It was in force for 49 min. 2 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: Apr 13, 1998, 5:56 PM CDT (22:56 UTC)
Expired: Apr 13, 1998, 6:45 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 22:55 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 13, 6:05 PM CDT	Hail 1.75	Arnold, MO
Apr 13, 6:21 PM CDT	Hail 0.75	De Soto, MO

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
Apr 13, 3:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 268 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

000 
TTAA00 KSTL 132256 RRA
TORSTL
MOC099-132345-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
556 PM CDT MON APR 13 1998
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  645 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL MISSOURI
 
   ...JEFFERSON COUNTY
 
AT 555 PM...RADAR INDICATED A POSSIBLE TORNADO JUST MOVING INTO
SOUTHWEST JEFFERSON COUNTY 15 MILES WEST OF HILLSBORO.
 
ANOTHER POSSIBLE TORNADO WAS 12 MILES WEST OF ARNOLD.
 
THE STORMS WERE MOVING EAST AT 30 MPH.
 
THE TOWNS OF HILLSBORO...FESTUS AND ARNOLD ARE IN THE PATHS OF THESE
STORMS.
 
 
 
 
IF YOU ARE IN THE PATH OF THIS STORM...TAKE COVER IN A BASEMENT
OR INTERIOR ROOM ON THE LOWEST LEVEL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 10:41 AM CDT	Severe Thunderstorm Warning	LSX	Franklin	49 min
Apr 13, 12:04 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois	56 min
Apr 13, 12:10 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve	50 min
Apr 13, 1:42 PM CDT	Severe Thunderstorm Warning	LSX	Boone	63 min
Apr 13, 1:56 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	49 min
Apr 13, 2:19 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	41 min
Apr 13, 2:48 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	42 min
Apr 13, 2:57 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery	48 min
Apr 13, 3:05 PM CDT	Tornado Warning	LSX	Callaway, Montgomery	40 min
Apr 13, 3:09 PM CDT	Tornado Warning	LSX	Crawford	51 min
Apr 13, 3:19 PM CDT	Severe Thunderstorm Warning	LSX	Warren	41 min
Apr 13, 3:24 PM CDT	Tornado Warning	LSX	Washington	51 min
Apr 13, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	42 min
Apr 13, 3:52 PM CDT	Tornado Warning	LSX	Warren	53 min
Apr 13, 4:11 PM CDT	Tornado Warning	LSX	Jefferson, Washington	49 min
Apr 13, 4:16 PM CDT	Tornado Warning	LSX	Saint Charles	44 min
Apr 13, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	54 min
Apr 13, 4:40 PM CDT	Tornado Warning	LSX	Saint Charles	65 min
Apr 13, 4:45 PM CDT	Tornado Warning	LSX	Sainte Genevieve, Saint Francois	60 min
Apr 13, 4:54 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Washington	66 min
Apr 13, 4:54 PM CDT	Severe Thunderstorm Warning	LSX	Reynolds	66 min
Apr 13, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	41 min
Apr 13, 5:36 PM CDT	Tornado Warning	LSX	Saint Louis	54 min
Apr 13, 5:42 PM CDT	Tornado Warning	LSX	Sainte Genevieve	63 min
Apr 13, 5:50 PM CDT	Tornado Warning	LSX	City of Saint Louis	40 min
Apr 13, 6:19 PM CDT	Tornado Warning	LSX	Iron, Reynolds	41 min
Apr 13, 6:32 PM CDT	Tornado Warning	LSX	Madison	58 min

Nearby

Tornado Warnings in Missouri, 1998 Every tornado warning in 1998 Tornadoes 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.