Alert archive / Missouri / Flash Flood Warnings in 1993

Flash Flood Warning 46, NWS St. Louis, MO

July 20, 19934 counties in Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 20, 1993, 5:45 PM CDT for 4 counties in Missouri. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 1993, 5:45 PM CDT (22:45 UTC)
Expired: Jul 20, 1993, 7:45 PM CDT
In force: 2 hr
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 19 km from the middle of the area, began a volume at 22:49 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 12:00Z, 10.8 hours before the alert went out and 238 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: 1217 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 689 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: -32 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 202248 COR
FFWSTL
MOC071-099-183-189-510-210045-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED...
NATIONAL WEATHER SERVICE ST LOUIS MO
545 PM CDT TUE JUL 20 1993

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  745 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN EAST CENTRAL MISSOURI

   ...FRANKLIN COUNTY...JEFFERSON COUNTY...ST CHARLES COUNTY
   ...ST LOUIS COUNTY

  AND THE INDEPENDENT CITY OF


   ...ST LOUIS CITY
AT 540 PM...A LINE OF THUNDERSTORMS WAS PRODUCING VERY HEAVY RAIN FROM
NORTHERN ST CHARLES COUNTY THROUGH ST LOUIS COUNTY AND INTO FRANKLIN
COUNTY. RAINFALL AMOUNTS OF 1 TO 2 INCHES HAVE FALLEN FROM THESE STORMS.
ADDITIONAL AMOUNTS OF MORE THAN AN INCH ARE POSSIBLE ACROSS ST
LOUIS...JEFFERSON AND ST LOUIS CITY. DUE TO THE SATURATED
CONDITIONS...FLASH FLOODING IS LIKELY.


BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.


TUCKER

What forecasters said that day

The local office's own words before this flash flood 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, Jul 20, 5:10 PM CDT, 35 minutes before

MOZ010-011-014-202300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA MO
510 PM CDT TUE JUL 20 1993

...A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 900 PM CDT
FOR THE EAST AND SOUTH SECTIONS OF CENTRAL MISSOURI...

AT 505 PM CDT WEATHER RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY
SHOWERS OVER EAST AND SOUTH MISSOURI.  THE BAND WAS ABOUT 25 MILES WIDE
AND EAST OF A LINE EXTENDING FROM 55 MILES EAST OF COLUMBIA TO 55 MILES
SOUTHEAST OF COLUMBIA...AROUND SULLIVAN...TO JUST SOUTH OF FT. LEONARD
WOOD.  THE THUNDERSTORMS WERE MOVING TO THE EAST AND SOUTHEAST AROUND
25 MILES AN HOUR AND NO LONGER PRESENT A THREAT OF SEVERE WEATHER TO
CENTRAL MISSOURI.

NO SEVERE WEATHER WAS REPORTED OR INDICATED BY RADAR IN CENTRAL
MISSOURI DURING THE LAST HOUR.

LB/GS

Special weather statement, Jul 20, 5:10 PM CDT, 35 minutes before

MOZ010-011-014-202300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA MO
510 PM CDT TUE JUL 20 1993

...A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 900 PM CDT
FOR THE EAST AND SOUTH SECTIONS OF CENTRAL MISSOURI...

AT 505 PM CDT WEATHER RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY
SHOWERS OVER EAST AND SOUTH MISSOURI.  THE BAND WAS ABOUT 25 MILES WIDE
AND EAST OF A LINE EXTENDING FROM 55 MILES EAST OF COLUMBIA TO 55 MILES
SOUTHEAST OF COLUMBIA...AROUND SULLIVAN...TO JUST SOUTH OF FT. LEONARD
WOOD.  THE THUNDERSTORMS WERE MOVING TO THE EAST AND SOUTHEAST AROUND
25 MILES AN HOUR AND NO LONGER PRESENT A THREAT OF SEVERE WEATHER TO
CENTRAL MISSOURI.

NO SEVERE WEATHER WAS REPORTED OR INDICATED BY RADAR IN CENTRAL
MISSOURI DURING THE LAST HOUR.

LB/GS

Local storm report, Jul 20, 5:23 PM CDT, 22 minutes before

MOZ010-011-014-210000-

PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA MO
530 PM CDT TUE JUL 20 1993

TIME         COUNTY        REPORT
205 PM       BENTON       VERY HEAVY SHOWERS WITH WINDS GUSTING TO
                          50 MPH JUST NORTHWEST OF WARSAW.
245 PM       CAMDEN       WINDS GUSTING TO 57 MPH NEAR HWY FF NORTHWEST
                          OF CAMDENTON.
300 PM       CAMDEN       TREES DOWN AND HEAVY SHOWERS ON HIGHWAYS 5 AND
                          7 IN CLIMAX SPRINGS.
315 PM       CAMDEN       SIGNS AND TREES DOWN NEAR OSAGE BEACH.
320 PM       CAMDEN       TREES BLOWN DOWN ON MOBIL HOME NEAR OSAGE
                          BEACH.
355 PM       MONTGOMERY   TBREES DOWN IN DANVILLE.
400 PM       MONTGOMERY   MARBLE-SIZED HAIL 2 MILES SOUTHWEST OF
                          MONTGOMERY CITY.
LB

Local storm report, Jul 20, 5:30 PM CDT, 15 minutes before

MOZ010-011-014-210000-

PRELIMINARY STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA MO
530 PM CDT TUE JUL 20 1993

TIME         COUNTY        REPORT
205 PM       BENTON       VERY HEAVY SHOWERS WITH WINDS GUSTING TO
                          50 MPH JUST NORTHWEST OF WARSAW.
245 PM       CAMDEN       WINDS GUSTING TO 57 MPH NEAR HWY FF NORTHWEST
                          OF CAMDENTON.
300 PM       CAMDEN       TREES DOWN AND HEAVY SHOWERS ON HIGHWAYS 5 AND
                          7 IN CLIMAX SPRINGS.
315 PM       CAMDEN       SIGNS AND TREES DOWN NEAR OSAGE BEACH.
320 PM       CAMDEN       TREES BLOWN DOWN ON MOBIL HOME NEAR OSAGE
                          BEACH.
355 PM       MONTGOMERY   TREES DOWN IN DANVILLE.
400 PM       MONTGOMERY   MARBLE-SIZED HAIL 2 MILES SOUTHWEST OF
                          MONTGOMERY CITY.
LB

Local storm report, Jul 20, 5:40 PM CDT, 5 minutes before

MOZ010-011-014-210000-

PRELIMINARY STORM REPORT...CORRECTED TO ADD INFO.
NATIONAL WEATHER SERVICE COLUMBIA MO
540 PM CDT TUE JUL 20 1993

TIME         COUNTY        REPORT
205 PM       BENTON       VERY HEAVY SHOWERS WITH WINDS GUSTING TO
                          50 MPH JUST NORTHWEST OF WARSAW.
245 PM       CAMDEN       WINDS GUSTING TO 57 MPH NEAR HWY FF NORTHWEST
                          OF CAMDENTON.
300 PM       CAMDEN       TREES DOWN AND HEAVY SHOWERS ON HIGHWAYS 5 AND
                          7 IN CLIMAX SPRINGS.
315 PM       CAMDEN       SIGNS AND TREES DOWN NEAR OSAGE BEACH.
320 PM       CAMDEN       TREES BLOWN DOWN ON MOBIL HOME NEAR OSAGE
                          BEACH.
355 PM       MONTGOMERY   TREES DOWN IN DANVILLE.
400 PM       MONTGOMERY   MARBLE-SIZED HAIL 2 MILES SOUTHWEST OF
                          MONTGOMERY CITY.
245 PM       S. MILLER    NUMEROUS TREES DOWN...2 TO 3 FOOT DIAMETER
                          TREE FELL ON HOUSE IN IBERIA.  TIME IS
APPROXIMATE.

LB

Local storm report, Jul 20, 5:42 PM CDT, 3 minutes before

MOZ010-011-014-210000-

PRELIMINARY STORM REPORT...CORRECTED TO ADD INFO.
NATIONAL WEATHER SERVICE COLUMBIA MO
540 PM CDT TUE JUL 20 1993

TIME         COUNTY        REPORT
205 PM       BENTON       VERY HEAVY SHOWERS WITH WINDS GUSTING TO
                          50 MPH JUST NORTHWEST OF WARSAW.
245 PM       CAMDEN       WINDS GUSTING TO 57 MPH NEAR HWY FF NORTHWEST
                          OF CAMDENTON.
300 PM       CAMDEN       TREES DOWN AND HEAVY SHOWERS ON HIGHWAYS 5 AND
                          7 IN CLIMAX SPRINGS.
315 PM       CAMDEN       SIGNS AND TREES DOWN NEAR OSAGE BEACH.
320 PM       CAMDEN       TREES BLOWN DOWN ON MOBIL HOME NEAR OSAGE
                          BEACH.
355 PM       MONTGOMERY   TREES DOWN IN DANVILLE.
400 PM       MONTGOMERY   MARBLE-SIZED HAIL 2 MILES SOUTHWEST OF
                          MONTGOMERY CITY.
245 PM       S. MILLER    NUMEROUS TREES DOWN...2 TO 3 FOOT DIAMETER
                          TREE FELL ON HOUSE IN IBERIA.  TIME IS
APPROXIMATE.

LB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 3:11 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	49 min
Jul 20, 3:26 PM CDT	Severe Thunderstorm Warning	LSX	Pike	64 min
Jul 20, 4:08 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	52 min
Jul 20, 4:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	57 min
Jul 20, 4:41 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	64 min
Jul 20, 5:07 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	53 min
Jul 20, 5:20 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	55 min
Jul 20, 5:40 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Washington	65 min
Jul 20, 5:45 PM CDT	Flash Flood Warning	LSX	City of Saint Louis	2 hr
Jul 20, 6:20 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	55 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.