Alert archive / Illinois / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 12, NWS St. Louis, MO

April 19, 1993Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 19, 1993, 10:02 PM CDT for Randolph County, Illinois. It was in force for 43 min.

The area

The counties it named.

The facts

Issued: Apr 19, 1993, 10:02 PM CDT (03:02 UTC)
Expired: Apr 19, 1993, 10:45 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Randolph County, IL

The radar

The St Louis radar (KLSX), 104 km from the middle of the area, began a volume at 03:03 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 nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 3.0 hours before the alert went out and 147 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: 151 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 1593 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 364 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

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 19, 8:01 PM CDT, 2 hours 1 minute before

MOZALL-200200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
801 PM CDT MON APR 19 1993

...THE TORNADO WATCH FOR CENTRAL AND NORTHEAST MISSOURI HAS
   EXPIRED...
...THE TORNADO WATCH FOR EASTERN AND SOUTHEAST MISSOURI IS
   IN EFFECT UNTIL MIDNIGHT...

TORNADO WATCH NUMBER 142 THAT WAS IN EFFECT FOR CENTRAL AND NORTHEAST
MISSOURI EXPIRED AT 8 PM.  THERE WILL BE ADDITIONAL SHOWERS AND
THUNDERSTORMS BUT THEY ARE NOT EXPECTED TO BE SEVERE.

TORNADO WATCH NUMBER 145 REMAINS IN EFFECT UNTIL MIDNIGHT.

TUCKER

Local storm report, Apr 19, 9:22 PM CDT, 40 minutes before

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Special weather statement, Apr 19, 9:45 PM CDT, 17 minutes before

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Special weather statement, Apr 19, 9:46 PM CDT, 16 minutes before

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Special weather statement, Apr 19, 9:55 PM CDT, 7 minutes before

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Special weather statement, Apr 19, 9:58 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:13 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis	47 min
Apr 19, 8:07 PM CDT	Severe Thunderstorm Warning	LSX	Adair	38 min
Apr 19, 8:25 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	50 min
Apr 19, 8:54 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	51 min
Apr 19, 9:38 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Marion	52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1993 Every severe thunderstorm warning in 1993

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.