Alert archive / Iowa / Flash Flood Warnings in 1993

Flash Flood Warning 66, NWS Des Moines, IA

July 10, 1993Clay County, Palo Alto County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jul 10, 1993, 11:56 PM CDT for Clay County, Palo Alto County, Iowa. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 10, 1993, 11:56 PM CDT (04:56 UTC)
Expired
Jul 11, 1993, 3:00 AM CDT
In force
3 hr
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Clay County, IA, Palo Alto County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 4.9 hours before the alert went out and 223 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, Minneapolis, MN at 00:00Z on 1993-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 214 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, Minneapolis, MN at 00:00Z on 1993-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 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
214 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
1366 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
89 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 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 10, 9:43 PM CDT, 2 hours 13 minutes before
IAZALL-110340-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT SAT JUL 10 1993

...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT...

AT 930 PM CDT...THE STRONG STORMS OVER EXTREME SOUTH CENTRAL IOWA HAD
MOVED INTO NORTHERN MISSOURI.  HOWEVER SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS CONTINUED OVER THE SOUTH CENTRAL AND SOUTHEAST COUNTIES...
SOUTHEAST OF A LINE FROM 60 MILES SOUTH OF DES MOINES AT LAMONI...TO
OTTUMWA...TO DAVENPORT.

THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.

A FEW SHOWERS ALSO CONTINUED OVER FAR NORTH CENTRAL IOWA...NORTH OF A
LINE FROM NORTHWOOD TO CRESCO.  NORTHWOOD IS 20 MILES NORTH OF MASON
CITY...AND CRESCO IS 40 MILES NORTHEAST OF MASON CITY.

IN ADDITION...SCATTERED SHOWERS AND THUNDERSTORMS WERE BEGINNING TO
MOVE INTO NORTHWEST IOWA...40 MILES NORTH OF SIOUX CITY NEAR ROCK
RAPIDS AND SIOUX CENTER.

THE SHOWERS AND STORMS IN NORTHERN IOWA WERE MOVING EAST AT 25 MILES
AN HOUR.

KALLMAN
Special weather statement, Jul 10, 9:43 PM CDT, 2 hours 13 minutes before
IAZALL-110340-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT SAT JUL 10 1993

...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT...

AT 930 PM CDT...THE STRONG STORMS OVER EXTREME SOUTH CENTRAL IOWA HAD
MOVED INTO NORTHERN MISSOURI.  HOWEVER SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS CONTINUED OVER THE SOUTH CENTRAL AND SOUTHEAST COUNTIES...
SOUTHEAST OF A LINE FROM 60 MILES SOUTH OF DES MOINES AT LAMONI...TO
OTTUMWA...TO DAVENPORT.

THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.

A FEW SHOWERS ALSO CONTINUED OVER FAR NORTH CENTRAL IOWA...NORTH OF A
LINE FROM NORTHWOOD TO CRESCO.  NORTHWOOD IS 20 MILES NORTH OF MASON
CITY...AND CRESCO IS 40 MILES NORTHEAST OF MASON CITY.

IN ADDITION...SCATTERED SHOWERS AND THUNDERSTORMS WERE BEGINNING TO
MOVE INTO NORTHWEST IOWA...40 MILES NORTH OF SIOUX CITY NEAR ROCK
RAPIDS AND SIOUX CENTER.

THE SHOWERS AND STORMS IN NORTHERN IOWA WERE MOVING EAST AT 25 MILES
AN HOUR.

KALLMAN
Special weather statement, Jul 10, 10:48 PM CDT, 1 hour 8 minutes before
IAZALL-110440-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1048 PM CDT SAT JUL 10 1993

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHWEST IOWA UNTIL
   4 AM SUNDAY MORNING...
...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT...

AT 1032 PM CDT...ISOLATED VERY STRONG THUNDERSTORMS HAD REDEVELOPED OVER
SOUTH CENTRAL IOWA.  THE STORMS WERE LOCATED 60 MILES SOUTHWEST OF DES
MOINES NEAR MOUNT AYR...AND 60 MILES SOUTH OF DES MOINES BETWEEN LAMONI
AND LEON.  THE STORMS WERE PRODUCING EXTREMELY HEAVY RAIN AND FREQUENT
LIGHTNING...AND POSSIBLY GUSTY WINDS AND SMALL HAIL.

THESE STORMS WERE MOVING SLOWLY NORTHEAST AT 15 MILES AN HOUR.

OTHER SHOWERS AND THUNDERSTORMS WERE LOCATED OVER SOUTHERN IOWA SOUTH
OF A LINE FROM 40 MILES SOUTHWEST OF OTTUMWA AT CORYDON...TO DAVENPORT.
THESE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR.
/
IN ADDITION...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER
NORTHERN IOWA...NORTH OF A LINE FROM SIOUX CITY TO 45 MILES NORTHEAST
OF MASON CITY NEAR CRESCO.

THESE SHOWERS AND STORMS WERE MOVING EAST AT 25 MILES AN HOUR.

KALLMAN
Special weather statement, Jul 10, 10:48 PM CDT, 1 hour 8 minutes before
IAZALL-110440-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1048 PM CDT SAT JUL 10 1993

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHWEST IOWA UNTIL
   4 AM SUNDAY MORNING...
...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT...

AT 1032 PM CDT...ISOLATED VERY STRONG THUNDERSTORMS HAD REDEVELOPED OVER
SOUTH CENTRAL IOWA.  THE STORMS WERE LOCATED 60 MILES SOUTHWEST OF DES
MOINES NEAR MOUNT AYR...AND 60 MILES SOUTH OF DES MOINES BETWEEN LAMONI
AND LEON.  THE STORMS WERE PRODUCING EXTREMELY HEAVY RAIN AND FREQUENT
LIGHTNING...AND POSSIBLY GUSTY WINDS AND SMALL HAIL.

THESE STORMS WERE MOVING SLOWLY NORTHEAST AT 15 MILES AN HOUR.

OTHER SHOWERS AND THUNDERSTORMS WERE LOCATED OVER SOUTHERN IOWA SOUTH
OF A LINE FROM 40 MILES SOUTHWEST OF OTTUMWA AT CORYDON...TO DAVENPORT.
THESE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR.
/
IN ADDITION...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER
NORTHERN IOWA...NORTH OF A LINE FROM SIOUX CITY TO 45 MILES NORTHEAST
OF MASON CITY NEAR CRESCO.

THESE SHOWERS AND STORMS WERE MOVING EAST AT 25 MILES AN HOUR.

KALLMAN
Special weather statement, Jul 10, 11:43 PM CDT, 13 minutes before
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Special weather statement, Jul 10, 11:43 PM CDT, 13 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 10, 7:25 PM CDTSevere Thunderstorm WarningDMXMitchell37 min
Jul 10, 8:39 PM CDTFlash Flood WarningDMXAppanoose2 hr
Jul 10, 8:39 PM CDTFlash Flood WarningDMXWayne102 min
Jul 10, 11:05 PM CDTSevere Thunderstorm WarningDMXLucas19 min
Jul 10, 11:36 PM CDTFlash Flood WarningDMXDickinson, Emmet3 hr
Jul 11, 6:10 AM CDTFlash Flood WarningDMXPolk4 hr

Nearby

Flash Flood Warnings in Iowa, 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.