Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 86, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 27, 1993, 9:50 PM CDT for Benton County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1993, 9:50 PM CDT (02:50 UTC)
- Expired
- Jul 28, 1993, 1:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Benton County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 2.8 hours before the alert went out and 332 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
- 175 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1555 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 280253 RRA FFWDSM IAC011-280600- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 950 PM CDT TUE JUL 27 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 100 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN EAST CENTRAL IOWA ...SOUTHERN BENTON COUNTY AT 955 PM CDT A STRONG THUNDERSTORM JUST WEST OF BELLE PLAINE SOME 35 MILES WEST OF CEDAR RAPIDS WAS PRODUCING HEAVY RAINS IN SOUTHERN BENTON COUNTY. AT 945 PM CDT REPORTS OF STREET FLOODING...BASEMENT FLOODING AND COMMERICAL FLOODING WAS REPORTED IN BELLE PLAINE. HEAVY RAINS WILL CONTINUE OVER THE AREA OF SOUTHERN BENTON COUNTY UNTIL 1015 PM CDT. PRAIRIE CREEK...AND TRIBUTARIES OF THE IOWA RIVER WILL BE AFFECTED. 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. FORSTER/LEWIS
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 27, 6:47 PM CDT, 3 hours 3 minutes before
IAZALL-280040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 642 PM CDT TUE JUL 27 1993 ...A TORNADO WATCH IS IN EFFECT FOR THE EASTERN TWO THIRDS OF IOWA UNTIL 10PM... AT 633 PM CDT...VERY STRONG THUNDERSTORMS PERSISTED OVER CENTRAL IOWA. THESE STORMS WERE CLUSTERED BETWEEN OGDEN...STORY CITY AND 10 MILES EAST OF NEVADA...OR WITHIN A 25 MILE RADIUS OF AMES. THE STORMS IN THIS AREA WILL PRODUCE VERY HEAVY RAIN...FREQUENT DEADLY LIGHTNING AND SOME PEA TO MARBLE SIZED HAIL. THESE STORMS WERE PART OF A 25 TO 45 MILE WIDE AREA OF SHOWERS AND STORMS THAT EXTENDED FROM 45 MILES WEST OF DES MOINES NEAR ADAIR NORTHEAST TO INDEPENDENCE. INDEPENDENCE IS 20 MILES EAST OF WATERLOO. ISOLATED THUNDERSTORMS WERE LOCATED 10 MILES SOUTHWEST OF MASON CITY AND BETWEEN CHARLES CITY AND CRESCO. CHARLES CITY IS 30 MILES EAST OF WATERRLOO WHILE CRESCO IS 55 MILES NORTHEAST OF MASON CITY. THE SHOWERS AND STORMS MOVING EAST NORTHEAST AT 30 MILES AN HOUR. BARLOW/PRENTICE
Special weather statement, Jul 27, 7:51 PM CDT, 1 hour 59 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 750 PM CDT TUE JUL 27 1993 ...THUNDERSTORMS TO AFFECT A GOOD PART OF NORTHEAST IOWA... AT 740 PM THUNDERSTORMS CONTINUED TO AFFECT AREAS EAST OF I-35 WITH THE STRONGEST STORMS 10 MILES SOUTH OF WATERLOO NEAR HUDSON. OTHER STRONG STORMS WERE LOCATED FROM 25 MILES WEST OF DECORAH TO 5 MILES NORTH OF DECORAH. THESE STORMS WERE MOVING EAST AT 25 MPH AND ARE CAPABLE OF PRODUCING HEAVY RAINS...GUSTY WINDS...SMALL HAIL AND DEADLY LIGHTNING. PEOPLE IN THE CITIES OF HUDSON...LAPORTE CITY AND HESPER SHOULD BE PREPARED TO MOVE TO A PLACE OF SHELTER SHOULD SEVERE WEATHER OCCUR. SINCE 715 PM THE STORMS HAVE WEAKENED AND THE THREAT OF SEVERE WEATHER HAS DECREASED BUT STILL EXISTS. THE ONLY REPORT OF SEVERE WEATHER TONIGHT WAS A 90 MPH WIND GUST AT CONRAD IN GRUNDY COUNTY AT 710 PM. REMEMBER A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM. SHOULD SEVERE WEATHER APPROACH OR A WARNING BE ISSUED BE SURE TO SEEK IMMEDIATE SHELTER AND MONITOR NOAA WEATHER RADIO...COMMERCIAL TV OR RADIO. COLLAR
Special weather statement, Jul 27, 7:52 PM CDT, 1 hour 58 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 750 PM CDT TUE JUL 27 1993 ...THUNDERSTORMS TO AFFECT A GOOD PART OF NORTHEAST IOWA... AT 740 PM THUNDERSTORMS CONTINUED TO AFFECT AREAS EAST OF I-35 WITH THE STRONGEST STORMS 10 MILES SOUTH OF WATERLOO NEAR HUDSON. OTHER STRONG STORMS WERE LOCATED FROM 25 MILES WEST OF DECORAH TO 5 MILES NORTH OF DECORAH. THESE STORMS WERE MOVING EAST AT 25 MPH AND ARE CAPABLE OF PRODUCING HEAVY RAINS...GUSTY WINDS...SMALL HAIL AND DEADLY LIGHTNING. PEOPLE IN THE CITIES OF HUDSON...LAPORTE CITY AND HESPER SHOULD BE PREPARED TO MOVE TO A PLACE OF SHELTER SHOULD SEVERE WEATHER OCCUR. SINCE 715 PM THE STORMS HAVE WEAKENED AND THE THREAT OF SEVERE WEATHER HAS DECREASED BUT STILL EXISTS. THE ONLY REPORT OF SEVERE WEATHER TONIGHT WAS A 90 MPH WIND GUST AT CONRAD IN GRUNDY COUNTY AT 710 PM. REMEMBER A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM. SHOULD SEVERE WEATHER APPROACH OR A WARNING BE ISSUED BE SURE TO SEEK IMMEDIATE SHELTER AND MONITOR NOAA WEATHER RADIO...COMMERCIAL TV OR RADIO. COLLAR
Special weather statement, Jul 27, 9:40 PM CDT, 10 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 940 PM CDT TUE JUL 27 1993 ...LOOK FOR THE STORMS TO GRADUALLY TAPER OFF... AT 935 PM THUNDERSTORMS CONTINUED MAINLY EAST OF HIGHWAY 63. THE STORM PRODUCING THE HEAVIEST RAIN WAS LOCATED 10 MILES EAST OF WATERLOO BETWEEN RAYMOND AND JESUP. THE STROMS WERE MOVING EAST AT NEAR 40 MPH AND WILL AFFECT JESUP AND INDEPENDENCE THROUGH 1015 PM. OTHER SHOWERS AND STORMS ARE GOING TO BECOME CONFINED TO AREAS EAST OF HIGHWAY 150 BY 1030 PM. THE REST OF NORTHEAST IOWA CAN EXPECT SLOWLY CLEARING SKIES INTO MIDNIGHT. THE TORNADO WATCH HAS BEEN CANCELLED AS THE THREAT OF SEVERE WEATHER HAS DIMINISHED. COLLAR
Special weather statement, Jul 27, 9:42 PM CDT, 8 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 940 PM CDT TUE JUL 27 1993 ...LOOK FOR THE STORMS TO GRADUALLY TAPER OFF... AT 935 PM THUNDERSTORMS CONTINUED MAINLY EAST OF HIGHWAY 63. THE STORM PRODUCING THE HEAVIEST RAIN WAS LOCATED 10 MILES EAST OF WATERLOO BETWEEN RAYMOND AND JESUP. THE STROMS WERE MOVING EAST AT NEAR 40 MPH AND WILL AFFECT JESUP AND INDEPENDENCE THROUGH 1015 PM. OTHER SHOWERS AND STORMS ARE GOING TO BECOME CONFINED TO AREAS EAST OF HIGHWAY 150 BY 1030 PM. THE REST OF NORTHEAST IOWA CAN EXPECT SLOWLY CLEARING SKIES INTO MIDNIGHT. THE TORNADO WATCH HAS BEEN CANCELLED AS. THE THREAT OF SEVERE WEATHER HAS DIMINISHED. COLLAR
Special weather statement, Jul 27, 9:47 PM CDT, 3 minutes before
IAZALL-280340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 947 PM CDT TUE JUL 27 1993 ...A TORNADO WATCH CONTINUES FOR THE EASTERN ONE-THIRD OF IOWA UNTIL 10 PM... AT 932 PM CDT...A CLUSTER OF VERY STRONG THUNDERSTORMS WAS LOCATED ACROSS EAST CENTRAL IOWA. THIS STORM AREA WAS 20 MILES IN DIAMETER AND WAS CENTERED 30 MILES WEST OF CEDAR RAPIDS OR 5 MILES SOUTHWEST OF BELLE PLAINE. THESE STORMS HAVE THE POTENTIAL TO PRODUCE VERY STRONG WINDS AND POSSIBLY SOME SMALL HAIL. MOVEMENT WAS RAPIDLY EAST AT 40 MILES AN HOUR. THESE STORMS SHOULD ARRIVE IN THE CEDAR RAPIDS AND IOWA CITY AREAS SHORTLY AFTER 10 PM. THESE STORMS WERE EMBEDDED WITHIN AN AREA OF SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WHICH CONTINUED ACROSS SOUTH CENTRAL...EAST CENTRAL AND NORTHEAST IOWA. MOVEMENT WAS EAST AT 40 MILES AN HOUR. R A PRENTICE }LhH.tU*&Z) .M+jk&N"kJAZ078-088-089-099-280330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MOLINE IL 950 PM CDT TUE JUL 27 199 ...TORNADO WATCH WAS CANCELED. SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 400 AM FOR THE ENTIRE TWO STATE REGION... THE LEADING EDGE OF INTENSE THUNDERSTORMS STRETCHED FROM NORTHWESTERN JONES COUNTY IOWA...60 MILES NORTHWEST OF THE QUAD CITIES...TO 100 MILES WEST OF THE QUAD CITIES IN NORTHEASTERN MAHASKA COUNTY IOWA. THE PREVIOUS THUNDERSTORMS THAT WERE ORIGINALLY FORECAST TO HIT CEDAR COUNTY BETWEEN 915 AND 930 PM MOVED NORTH OF THE COUNTY. HOWEVER... INTENSE THUNDERSTORMS IN NORTHERN IOWA AND SOUTHERN BENTON IOWA WILL MOVE EAST INTO WESTERN CEDAR COUNTY IOWA BETWEEN 1030 AND 1040 PM. ALL THUNDERSTORMS WERE MOVING EAST AT 45 MILES AN HOUR. STRONG WINDS AND HEAVY RAIN CAN BE EXPECTED WITH THESE STORMS. HAIL IS ALSO POSSIBLE WITH A FEW OF THESE STORMS. PLEASE KEEP ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS. STREAMS AND CREEKS MAY ALSO RISE RAPIDLY WITH THESE HEAVY DOWNPOURS. ALWAYS REMEMBER...LIGHTING IS ASSOCIATED WITH ALL OF THESE STORMS AND IT IS A KNOWN KILLER. GOEHRING
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 7:10 PM CDT | Severe Thunderstorm Warning | DMX | Grundy | 17 min |
| Jul 27, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 21 min |
| Jul 27, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 31 min |
| Jul 27, 7:44 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 31 min |
| Jul 27, 8:08 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 37 min |
| Jul 27, 8:10 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 35 min |
| Jul 27, 9:18 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Iowa | 27 min |
| Jul 27, 9:44 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 46 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.