Alert archive / Missouri / Flash Flood Warnings in 1993

Flash Flood Warning 26, NWS St. Louis, MO

July 3, 1993Saint Charles County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 3, 1993, 10:50 AM CDT for Saint Charles County, Missouri. It was in force for 36 min.

The area

The counties it named.

The facts

Issued
Jul 3, 1993, 10:50 AM CDT (15:50 UTC)
Expired
Jul 3, 1993, 11:26 AM CDT
In force
36 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Saint Charles County, MO

The radar

The St Louis radar (KLSX), 9 km from the middle of the area, began a volume at 15:54 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, 3.8 hours before the alert went out and 257 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, Paducah/Barkley, KY at 12:00Z on 1993-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 906 joules per kilogram.LCLLFCEL10008507005003002001001 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, Paducah/Barkley, KY at 12:00Z on 1993-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 square meters per square second.1939Sfc1 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
906 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
959 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 031553
FFWSTL
MOC183-031945-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1050 AM CDT SAT JUL 3 1993
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  245 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL MISSOURI
 
   ...NORTHERN ST CHARLES COUNTY
 
...A PRIVATE LEVEE NORTH OF SAALE ROAD IS SERIOUSLY SEEPING AND IS
EXPECTED TO BREAK. THIS IS EXPECTED TO AFFECT THE TOWN OF WEST ALTON
BETWEEN 1055 AND 1 PM.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
 
TUCKER/BURNS

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 3, 10:15 AM CDT, 35 minutes before
MOZ001-004-005-008-009-013-015-040000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1015 AM CDT SAT JUL 3 1993

...GUSTY WINDS ARE EXPECTED OVER WESTERN MISSOURI TODAY...

A DEVELOPING STORM IN THE NORTHERN PLAINS WILL CAUSE STRONG SOUTHERLY
OVER WESTERN MISSOURI TODAY.  SUSTAINED WINDS OF 20 TO 30 MPH ARE
EXPECTED IN WEST CENTRAL AND NORTHWEST MISSOURI THIS AFTERNOON.  A FEW
GUSTS WILL APPROACH 40 MPH.

THESE WINDS WILL MAKE FOR HAZARDOUS BOATING CONDITIONS ON AREA LAKES
TODAY.  PERSONS VENTURING OUT ON OPEN WATERS ARE URGED TO STAY CLOSE
TO SHORE AS VERY ROUGH AND CHOPPY CONDITIONS ARE EXPECTED.

TUCKER
Special weather statement, Jul 3, 10:23 AM CDT, 27 minutes before
MOZ001-004-005-008-009-013-015-040000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1015 AM CDT SAT JUL 3 1993

...GUSTY WINDS ARE EXPECTED OVER WESTERN MISSOURI TODAY...

A DEVELOPING STORM IN THE NORTHERN PLAINS WILL CAUSE STRONG SOUTHERLY
OVER WESTERN MISSOURI TODAY.  SUSTAINED WINDS OF 20 TO 30 MPH ARE
EXPECTED IN WEST CENTRAL AND NORTHWEST MISSOURI THIS AFTERNOON.  A FEW
GUSTS WILL APPROACH 40 MPH.

THESE WINDS WILL MAKE FLOR HAZARDOUS BOATING CONDITIONS ON AREA LAKES
TODAY.  PERSONS VENTURING OUT ON OPEN WATERS ARE URGED TO STAY CLOSE
TO SHORE AS VERY ROUGH AND CHOPPY CONDITIONS ARE EXPECTED.

TUCKER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 9:16 PM CDTFlash Flood WarningLSXPhelps119 min

Nearby

Flash Flood Warnings in Missouri, 1993Every 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.