Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 89, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 31, 1993, 12:08 PM CDT for Johnson County, Linn County, Iowa. It was in force for 67 min.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1993, 12:08 PM CDT (17:08 UTC)
- Expired
- Jul 31, 1993, 1:15 PM CDT
- In force
- 67 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Johnson County, IA, Linn County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 5.1 hours before the alert went out and 368 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
- 3174 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 546 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 311710 FFWDSM IAC103-113-311815- BULLETIN - EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1208 PM CDT SAT JUL 31 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 115 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)S... IN EAST CENTRAL IOWA ...JOHNSON COUNTY...SOUTHERN LINN COUNTY A LINE OF SEVERE STORMS WERE LOCATED JUST SOUTHWEST OF CEDAR RAPIDS AND ABOUT 20 MILES WEST OF IOWA CITY. THE STORMS WERE MOVING EAST AT 35 MILES AN HOUR AND SHOULD BE MOVING INTO THE CEDAR RAPIDS AND IOWA CITY AREAS BETWEEN 1215 AND 1230 PM. DUE RECENT RAINS AND SATURATED GROUNDS A FLASH FLOOD WARNING HAS ALSO BEEN ISSUED. PERSON SHOULD NOT ATTEMPT TO DRIVE THROUGH FLOOD WATERS OR NEAR RAPID RISES RIVERS AND STREAMS. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING.V..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. JM
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 31, 11:07 AM CDT, 1 hour 1 minute before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311715- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1107 AM CDT SAT JUL 31 1993 ...THUNDERSTORMS CONTINUE TO RUMBLE THROUGHOUT NORTHEAST AND NORTH CENTRAL IOWA... AT 11AM...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...WINDS UP TO 35 MILES AN HOUR...AND FREQUENT DEADLY LIGHTNING WERE LOCATED FROM 25 MILES SOUTH OF MASON CITY NEAR THE TOWN OF HAMPTON...TO 35 MILES SOUTHWEST OF WATERLOO NEAR MARSHALLTOWN. AS THESE STORMS MOVE TO THE SOUTHEAST AT 25 TO 30 MILES AN HOUR...THEY WILL AFFECT THE TOWNS OF HAMPTON...PARKERSBURG...WATERLOO...CEDAR FALLS...GRUNDY CENTER...HUDSON...LA PORTE CITY...AND NEW HARTFORD. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 PM FOR NORTHEAST AND NORTH CENTRAL IOWA. CONDITIONS IN THIS WATCH AREA ARE FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT AND PERSONS IN THIS AREA SHOULD BE ON THE LOOKOUT FOR THE POSSIBILITY OF SEVERE STORMS. CONTINUE TO MONITOR THE SITUATION THROUGH YOUR LOCAL TELEVISION STATION...RADIO...OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE THUNDERSTORM WARNINGS. LINDENBERG
Special weather statement, Jul 31, 11:08 AM CDT, 1 hour before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311715- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1107 AM CDT SAT JUL 31 1993 ...THUNDERSTORMS CONTINUE TO RUMBLE THROUGHOUT NORTHEAST AND NORTH CENTRAL IOWA... AT 11AM...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...WINDS UP TO 35 MILES AN HOUR...AND FREQUENT DEADLY LIGHTNING WERE LOCATED FROM 25 MILES SOUTH OF MASON CITY NEAR THE TOWN OF HAMPTON...TO 35 MILES SOUTHWEST OF WATERLOO NEAR MARSHALLTOWN. AS THESE STORMS MOVE TO THE SOUTHEAST AT 25 TO 30 MILES AN HOUR...THEY WILL AFFECT THE TOWNS OF HAMPTON...PARKERSBURG...WATERLOO...CEDAR FALLS...GRUNDY CENTER...HUDSON...LA PORTE CITY...AND NEW HARTFORD. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 PM FOR NORTHEAST AND NORTH CENTRAL IOWA. CONDITIONS IN THIS WATCH AREA ARE FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT AND PERSONS IN THIS AREA SHOULD BE ON THE LOOKOUT FOR THE| POSSIBILITY OF SEVERE STORMS. CONTINUE TO MONITOR THE SITUATION THROUGH YOUR LOCAL TELEVISION STATION...RADIO...OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE THUNDERSTORM WARNINGS. LINDENBERG
Special weather statement, Jul 31, 11:38 AM CDT, 30 minutes before
IAZALL-311740-
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1138 AM CDT SAT JUL 31 1993
...SEVERE THUNDERSTORM WATCH FOR EASTERN THIRD UNTIL 200 PM...
AT 1125 AM CDT...A 20 MILE WIDE LINE OF INTENSE THUNDERSTORMS
EXTENDED FROM 25 MILES WEST OF DES MOINES...NEAR REDFIELD SOUTHEAST
THROUGH WINTERSET TO NEAR INDIANOLA THEN NORTHEAST TO THE NEWTON
AND GRINNELL AREAS. INDIANOLA 15 MILES SOUTH OF DES MOINES...NEWTON
IS 30 MILES EAST OF DES MOINES WHILE GRINNELL IS 45 MILES EAST OF
DES MOINES. ANOTHER INTENSE STORM WAS OVER NORTH CENTRAL IOWA SOME
40 MILES WEST OF MASON CITY NEAR ALGONA.
THE STORMS IN THIS AREA WILL PRODUCE EXTREMELY HEAVY RAIN...HAIL
...NEARLY CONTINUOUS DEADLY LIGHTNING AND STRONG GUSTY WINDS.
THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND STORMS
EAST OF A LINE FROM CLARINDA NORTHEAST TO NEAR ALGONA. CLARINDA IS
80 MILES SOUTHWEST OF DES MOINES.
THE INDIVIDUAL STORMS WERE MOVING EAST AT 25 MILES AN HOUR WHILE THE
AREA OF SHOWERS AND STORMS WERE SAGGING SOUTHEAST.
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610 OCNL C25 BKNQ6WWUSSpecial weather statement, Jul 31, 11:40 AM CDT, 28 minutes before
IAZALL-311740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1138 AM CDT SAT JUL 31 1993 ...SEVERE THUNDERSTORM WATCH FOR EASTERN THIRD UNTIL 200 PM... AT 1125 AM CDT...A 20 MILE WIDE LINE OF INTENSE THUNDERSTORMS EXTENDED FROM 25 MILES WEST OF DES MOINES...NEAR REDFIELD SOUTHEAST THROUGH WINTERSET TO NEAR INDIANOLA THEN NORTHEAST TO THE NEWTON AND GRINNELL AREAS. INDIANOLA 15 MILES SOUTH OF DES MOINES...NEWTON IS 30 MILES EAST OF DES MOINES WHILE GRINNELL IS 45 MILES EAST OF DES MOINES. ANOTHER INTENSE STORM WAS OVER NORTH CENTRAL IOWA SOME 40 MILES WEST OF MASON CITY NEAR ALGONA. THE STORMS IN THIS AREA WILL PRODUCE EXTREMELY HEAVY RAIN...HAIL ...NEARLY CONTINUOUS DEADLY LIGHTNING AND STRONG GUSTY WINDS. THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND STORMS EAST OF A LINE FROM CLARINDA NORTHEAST TO NEAR ALGONA. CLARINDA IS 80 MILES SOUTHWEST OF DES MOINES. THE INDIVIDUAL STORMS WERE MOVING EAST AT 25 MILES AN HOUR WHILE THE AREA OF SHOWERS AND STORMS WERE SAGGING SOUTHEAST. BARLOW/MARTIN
Special weather statement, Jul 31, 12:05 PM CDT, 3 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311800- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1205 PM CDT SAT JUL 31 1993 ...THUNDERSTORMS CONTINUE TO WORK THEIR WAY THROUGH NORTHEAST AND NORTH CENTRAL IOWA... AT NOON...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...FREQUENT DEADLY LIGHTNING...AND STRONG GUSTY WINDS WAS MOVING THROUGH THE WATERLOO...CEDAR FALLS METRO AREA. THESE STORMS WERE MOVING TOWARDS THE SOUTHEAST AT 30 MILES AN HOUR AND WILL CONTINUE TO AFFECT THE WATERLOO...CEDAR FALLS VICINITY ALONG WITH THE TOWNS OF HUDSON...LA PORTE CITY...GRUNDY CENTER...NEW HARTFORD...AND REINBECK. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2 PM FOR ALL OF NORTHEAST AND NORTH CENTRAL IOWA. ATMOSPHERIC CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND NEAR THE WATCH AREA. PERSONS IN THE WATCH AREA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER BY MONITORING YOUR LOCAL TV STATION...OR BY LISTENING TO YOUR RADIO OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
Special weather statement, Jul 31, 12:05 PM CDT, 3 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311800- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1205 PM CDT SAT JUL 31 1993 ...THUNDERSTORMS CONTINUE TO WORK THEIR WAY THROUGH NORTHEAST AND NORTH CENTRAL IOWA... AT NOON...A LINE OF THUNDERSTORMS PRODUCING VERY HEAVY RAINS...FREQUENT DEADLY LIGHTNING...AND STRONG GUSTY WINDS WAS MOVING THROUGH THE WATERLOO...CEDAR FALLS METRO AREA. THESE STORMS WERE MOVING TOWARDS THE SOUTHEAST AT 30 MILES AN HOUR AND WILL CONTINUE TO AFFECT THE WATERLOO...CEDAR FALLS VICINITY ALONG WITH THE TOWNS OF HUDSON...LA PORTE CITY...GRUNDY CENTER...NEW HARTFORD...AND REINBECK. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2 PM FOR ALL OF NORTHEAST AND NORTH CENTRAL IOWA. ATMOSPHERIC CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND NEAR THE WATCH AREA. PERSONS IN THE WATCH AREA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER BY MONITORING YOUR LOCAL TV STATION...OR BY LISTENING TO YOUR RADIO OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:08 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 52 min |
| Jul 31, 6:19 AM CDT | Flash Flood Warning | DMX | Benton, Linn | 56 min |
| Jul 31, 6:19 AM CDT | Severe Thunderstorm Warning | DMX | Benton, Linn | 56 min |
| Jul 31, 7:05 AM CDT | Severe Thunderstorm Warning | DMX | Benton | 45 min |
| Jul 31, 7:23 AM CDT | Flash Flood Warning | DMX | Benton | 3 hr |
| Jul 31, 7:40 AM CDT | Severe Thunderstorm Warning | DMX | Linn | 35 min |
| Jul 31, 8:15 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 45 min |
| Jul 31, 8:25 AM CDT | Severe Thunderstorm Warning | DMX | Franklin | 65 min |
| Jul 31, 8:56 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Hardin | 34 min |
| Jul 31, 9:10 AM CDT | Severe Thunderstorm Warning | DMX | Chickasaw | 27 min |
| Jul 31, 9:19 AM CDT | Severe Thunderstorm Warning | DMX | Greene | 41 min |
| Jul 31, 9:30 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Hardin | 60 min |
| Jul 31, 9:51 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Webster | 44 min |
| Jul 31, 10:42 AM CDT | Severe Thunderstorm Warning | DMX | Story | 27 min |
| Jul 31, 11:02 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 30 min |
| Jul 31, 11:12 AM CDT | Severe Thunderstorm Warning | DMX | Marion, Warren | 48 min |
| Jul 31, 11:38 AM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 33 min |
| Jul 31, 11:52 AM CDT | Severe Thunderstorm Warning | DMX | Wright | 52 min |
| Jul 31, 12:00 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Iowa | 30 min |
| Jul 31, 12:08 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 67 min |
| Jul 31, 12:16 PM CDT | Flash Flood Warning | DMX | Hardin | 59 min |
| Jul 31, 12:16 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 59 min |
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.