Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 33, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 27, 1993, 3:36 AM CDT for Johnson County, Washington County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jun 27, 1993, 3:36 AM CDT (08:36 UTC)
- Expired
- Jun 27, 1993, 6:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Johnson County, IA, Washington County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 8.6 hours before the alert went out and 394 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.
- Mixed-layer CAPE
- 911 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1826 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 270923 COR
FFWDSM
IAC103-183-271130-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING.................CORRECTION
NATIONAL WEATHER SERVICE DES MOINES IA
420 AM CDT SUN JUN 27 1993
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 630 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION(S)S...
IN EAST CENTRAL IOWA
...JOHNSON COUNTY
IN SOUTHEAST IOWA
...NORTHEASTERN WASHINGTON COUNTY
AT 326 AM CDT...THE JOHNSON COUNTY SHERIFF REPORTED NUMEROUS ROADS WITH
WATER FLOWING OVER THEM IN AND AROUND THE CORALVILLE RESERVIOR AND
ESPECIALLY DOWNSTREAM IN THE IOWA CITY AREA. PROBLEMS HAVE BEEN REPORTED
AND CREWS ARE ON THE WAY TO CLOSE ROADS IN THE VICINITIES OF NORTH
LIBERTY...TIFFIN AND OAKDALE...WHICH ARE ALL BETWEEN CORALVILLE
RESERVIOR AND I-80 GOING THROUGH IOWA CITY.
THE CORALVILLE RESERVIOR RECEIVED BETWEEN 4 AND 4.5 INCHES IN LESS THAN
AN HOUR BEFORE 315 AM WHICH CAUSED THE LAKE LEVEL TO SUDDENLY RISE.
AS OF 330 AM...DES MOINES NATIONAL WEATHER SERVICE RADAR INDICATED THE
STORMS WHICH PRODUCED THE HEAVY RAINS IN THE CORALVILLE/IOWA CITY AREA
WAS NOW SOUTH OF THAT AREA. THE BACK EDGE OF THE STORMS WAS ALONG A
LINE FROM 50 MILES EAST OF DES MOINES NEAR MONTEZUMA...TO 15 MILES
SOUTHWEST OF IOWA CITY NEAR KALONA...TO 10 MILES NORTH OF MOLINE
ILLINOIS NEAR LONG GROVE.
MOVEMENT WAS SOUTHEAST AT 30 MILES AN HOUR.
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.
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.
****CORRECTION - THE ENGINEERS AT CORALVILLE R,ESERVIOR REPORT WATER WAS
NOT...REPEAT NOT...GOING OVER THE SPILLWAY...AS
INDICATED EARLIER. THAT REPORT WAS INCORRECT.
BURKE
&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, Jun 27, 12:40 AM CDT, 2 hours 56 minutes before
IAZ026>030-038>042-053-054-270630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1240 AM CDT SUN JUN 27 1993 ...ISOLATED STRONG THUNDERSTORMS ARE MOVING INTO SOUTHERN JONES COUNTY... AT 1235 AM CDT...ISOLATED STRONG THUNDERSTORMS WERE MOVING INTO SOUTHERN JONES COUNTY. THESE ISOLATED STORMS WILL MOVE THROUGH THE TOWNS OF MORLY...OLIN...HALE AND WYOMING BY 135 AM AND WILL PRODUCE HEAVY RAINS...FREQUENT DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL. OTHERWISE...THE REST OF NORTHEAST IOWA IS EXPECTED TO SEE PARTLY CLOUDY SKIES PREVAILING WITH THE THREAT OF SHOWERS AND THUNDERSTORMS CONTINUING THROUGH THE NIGHTTIME HOURS. THE MERCURY IS ANTICIPATED TO FALL TO AROUND 60 DEGREES THROUGH THE NIGHT WITH WEST TO NORTHWEST WINDS CONTINUING AT 5 TO 10 MILES AN HOUR.
Special weather statement, Jun 27, 12:43 AM CDT, 2 hours 53 minutes before
IAZ026>030-038>042-053-054-270630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1240 AM CDT SUN JUN 27 1993 ...ISOLATED STRONG THUNDERSTORMS ARE MOVING INTO SOUTHERN JONES COUNTY... AT 1235 AM CDT...ISOLATED STRONG THUNDERSTORMS WERE MOVING INTO SOUTHERN JONES COUNTY. THESE ISOLATED STORMS WILL MOVE THROUGH THE TOWNS OF MORLY...OLIN...HALE AND WYOMING BY 135 AM AND WILL PRODUCE HEAVY RAINS...FREQUENT DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL. OTHERWISE...THE REST OF NORTHEAST IOWA IS EXPECTED TO SEE PARTLY CLOUDY SKIES PREVAILING WITH THE THREAT OF SHOWERS AND THUNDERSTORMS CONTINUING THROUGH THE NIGHTTIME HOURS. THE MERCURY IS ANTICIPATED TO FALL TO AROUND 60 DEGREES THROUGH THE NIGHT WITH WEST TO NORTHWEST WINDS CONTINUING AT 5 TO 10 MILES AN HOUR.
Special weather statement, Jun 27, 1:45 AM CDT, 1 hour 51 minutes before
IAZALL-270640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 145 AM CDT SUN JUN 27 1993 AT 131 AM CDT...SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN AND DEADLY LIGHTNING CONTINUED ACROSS CENTRAL AND EAST CENTRAL IOWA. THIS THUNDERSTORM AREA WAS 50 MILES WIDE AND EXTENDED FROM 20 MILES WEST OF DES MOINES TO THE QUAD CITIES. STORMS WITH VERY HEAVY RAIN AND POSSIBLE SMALL HAIL WERE LOCATED 20 MILES NORTH OF DES MOINES BETWEEN MADRID AND FARRAR...15 MILES SOUTHWEST OF CEDAR RAPIDS AND JUST NORTHWEST OF IOWA CITY. MOVEMENT WAS EAST-SOUTHEAST AT 40 MILES AN HOUR. R A PRENTICE
Special weather statement, Jun 27, 1:46 AM CDT, 1 hour 50 minutes before
IAZALL-270640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 145 AM CDT SUN JUN 27 1993 AT 131 AM CDT...SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN AND DEADLY LIGHTNING CONTINUED ACROSS CENTRAL AND EAST CENTRAL IOWA. THIS THUNDERSTORM AREA WAS 50 MILES WIDE AND EXTENDED FROM 20 MILES WEST OF DES MOINES TO THE QUAD CITIES. STORMS WITH VERY HEAVY RAIN AND POSSIBLE SMALL HAIL WERE LOCATED 20 MILES NORTH OF DES MOINES BETWEEN MADRID AND FARRAR...15 MILES SOUTHWEST OF CEDAR RAPIDS AND JUST NORTHWEST OF IOWA CITY. MOVEMENT WAS EAST-SOUTHEAST AT 40 MILES AN HOUR. R A PRENTICE
Special weather statement, Jun 27, 2:46 AM CDT, 50 minutes before
IAZALL-270740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 246 AM CDT SUN JUN 27 1993 AT 230 AM CDT...THUNDERSTORMS WITH VERY HEAVY RAIN...GUSTY WINDS... DEADLY LIGHTNING AND SMALL HAIL WERE LOCATED BETWEEN 5 MILES NORTHEAST AND 10 MILES SOUTHEAST OF NEWTON. NEWTON IS 25 MILES EAST OF DES MOINES. THESE STORMS WILL AFFECT THE TOWNS OF SEARSBORO...LYNNVILLE... MONTEZUMA AND NEW SHARON BY AROUND 3 AM. THESE STORMS WERE PART OF A LARGER AREA OF SCATTERED THUNDERSTORMS WHICH CONTINUED ACROSS CENTRAL...EAST CENTRAL AND SOUTHEAST IOWA. THIS AREA WAS 55 MILES WIDE AND EXTENDED FROM 20 MILES NORTHEAST OF DES MOINES TO THE QUAD CITIES. OTHER STORMS WITH VERY HEAVY RAIN WERE LOCATED 15 MILES EAST AND NORTHEAST OF WASHINGTON. MOVEMENT WAS EAST-SOUTHEAST AT 40 MILES AN HOUR. R A PRENTICE
Special weather statement, Jun 27, 2:48 AM CDT, 48 minutes before
IAZALL-270740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 246 AM CDT SUN JUN 27 1993 AT 230 AM CDT...THUNDERSTORMS WITH VERY HEAVY RAIN...GUSTY WINDS... DEADLY LIGHTNING AND SMALL HAIL WERE LOCATED BETWEEN 5 MILES NORTHEAST AND 10 MILES SOUTHEAST OF NEWTON. NEWTON IS 25 MILES EAST OF DES MOINES. THESE STORMS WILL AFFECT THE TOWNS OF SEARSBORO...LYNNVILLE... MONTEZUMA AND NEW SHARON BY AROUND 3 AM. THESE STORMS WERE PART OF A LARGER AREA OF SCATTERED THUNDERSTORMS WHICH CONTINUED ACROSS CENTRAL...EAST CENTRAL AND SOUTHEAST IOWA. THIS AREA WAS 55 MILES WIDE AND EXTENDED FROM 20 MILES NORTHEAST OF DES MOINES TO THE QUAD CITIES. OTHER STORMS WITH VERY HEAVY RAIN WERE LOCATED 15 MILES EAST AND NORTHEAST OF WASHINGTON. MOVEMENT WAS EAST-SOUTHEAST AT 40 MILES AN HOUR. R A PRENTICE
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Audubon | 36 min |
| Jun 26, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Guthrie | 27 min |
| Jun 26, 9:24 PM CDT | Severe Thunderstorm Warning | DMX | Dallas | 36 min |
| Jun 26, 9:39 PM CDT | Severe Thunderstorm Warning | DMX | Boone | 25 min |
| Jun 27, 2:14 AM CDT | Flash Flood Warning | DMX | Johnson, Washington | 3 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.