Alert archive / Missouri / Flash Flood Warnings in 1993

Flash Flood Warning 21, NWS St. Louis, MO

June 30, 1993Shelby County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 30, 1993, 9:34 PM CDT for Shelby County, Missouri. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 30, 1993, 9:34 PM CDT (02:34 UTC)
Expired: Jul 1, 1993, 12:30 AM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Whole counties

County Shelby County, MO

The radar

The St Louis radar (KLSX), 171 km from the middle of the area, began a volume at 02:34 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

Topeka, KS (KTOP), launched 00:00Z, 2.6 hours before the alert went out and 319 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: 3169 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 128 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 010237
FFWSTL
MOC205-010530-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
934 PM CDT WED JUN 30 1993
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM EFFECTIVE UNTIL 1030 PM
AND FLASH FLOOD WARNING EFFECTIVE UNTIL 1230 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST MISSOURI
 
   ...SOUTHEASTERN SHELBY COUNTY
 
AT 932 PM...NWS DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM PRODUCING
TORRENTIAL RAINFALL JUST EAST OF SHELBINA...OR 45 MILES SOUTHEAST OF
KIRKSVILLE. THIS STORM WAS MOVING EAST AT 15 MPH AND WILL EFFECT THE
TOWNS OF LAKENAN AND KENDALL.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 7:20 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	34 min
Jun 30, 7:36 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	35 min
Jun 30, 7:46 PM CDT	Severe Thunderstorm Warning	LSX	Adair	44 min
Jun 30, 8:17 PM CDT	Tornado Warning	LSX	Adair	58 min
Jun 30, 8:27 PM CDT	Severe Thunderstorm Warning	LSX	Shelby	63 min
Jun 30, 8:37 PM CDT	Severe Thunderstorm Warning	LSX	Knox	68 min
Jun 30, 9:07 PM CDT	Flash Flood Warning	LSX	Knox	3 hr
Jun 30, 9:18 PM CDT	Severe Thunderstorm Warning	LSX	Adair	57 min
Jun 30, 9:34 PM CDT	Severe Thunderstorm Warning	LSX	Shelby	56 min
Jun 30, 10:00 PM CDT	Severe Thunderstorm Warning	LSX	Marion	60 min
Jun 30, 10:10 PM CDT	Tornado Warning	LSX	Marion, Ralls	65 min
Jun 30, 10:39 PM CDT	Flash Flood Warning	LSX	Adair	3 hr
Jun 30, 11:15 PM CDT	Severe Thunderstorm Warning	LSX	Marion	32 min

Nearby

Flash Flood Warnings in Missouri, 1993 Every flash flood 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.