Alert archive / Iowa / Tornado Warnings in 1993
Tornado Warning 22, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 8, 1993, 9:09 PM CDT for Boone County, Iowa. It was in force for 36 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1993, 9:09 PM CDT (02:09 UTC)
- Expired
- Jul 8, 1993, 9:45 PM CDT
- In force
- 36 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Boone County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.2 hours before the alert went out and 218 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
- 3257 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 692 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 244 m²/s²
- 0-3 km storm-relative helicity
- 341 m²/s²
- Significant tornado parameter
- 6.3
- Supercell composite
- 27.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 090210 TORDSM IAC015-090245- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 909 PM CDT THU JUL 8 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN CENTRAL IOWA ...SOUTHERN BOONE COUNTY AT 904 PM CDT...RADAR INDICATED A TORNADO 10 MILES SOUTHWEST OF BOONE. BOONE IS ABOUT 15 MILES WEST OF AMES. PEOPLE IN LIVING IN LUTHER AND RURAL AREAS OF SOUTHERN BOONE COUNTY SHOULD TAKE COVER NOW! R A PRENTICE THIS IS A DANGEROUS STORM SITUATION. ACT QUICKLY. IF YOU ARE IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE. OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. AVOID WINDOWS. ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.
What forecasters said that day
The local office's own words before this tornado 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 8, 8:05 PM CDT, 1 hour 4 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 805 PM CDT THU JUL 8 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT... AT 800 PM...STRONG THUNDERSTORMS WERE CONTINUING ACROSS PORTIONS OF NORTHEAST AND NORTH CENTRAL IOWA. THESE THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS...DEADLY LIGHTNING...STRONG GUSTY WINDS...AND POSSIBLE SMALL HAIL. THESE THUNDERSTORMS WERE IN A LINE THAT EXTENDED FROM 25 MILES SOUTH OF MASON CITY...TO DUMONT...TO WAVERLY...TO WEST UNION. MOVEMENT WAS TO THE NORTHEAST AT 35 MILES AN HOUR AND WILL BE AFFECTING THE TOWNS OF SHEFFIELD...MARBLE ROCK...CLARKSVILLE...WAVERLY... WEST UNION...AND CHARLES CITY. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR NORTH CENTRAL AND PORTIONS OF NORTHEAST IOWA. ATMOSPHERIC CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS TO DEVELOP WITHIN THIS WATCH AREA. PERSONS WITHIN THE WATCH AREA SHOULD REMAIN ALERT FOR ANY CHANGES IN THE WEATHER AND BE PREPARED TO TAKE ACTION IF A WARNING IS ISSUED. STAY TUNED TO YOUR TELEVISION...RADIO...OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
Special weather statement, Jul 8, 8:07 PM CDT, 1 hour 2 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 805 PM CDT THU JUL 8 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT... AT 800 PM...STRONG THUNDERSTORMS WERE CONTINUING ACROSS PORTIONS OF NORTHEAST AND NORTH CENTRAL IOWA. THESE THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS...DEADLY LIGHTNING...STRONG GUSTY WINDS...AND POSSIBLE SMALL HAIL. THESE THUNDERSTORMS WERE IN A LINE THAT EXTENDED FROM 25 MILES SOUTH OF MASON CITY...TO DUMONT...TO WAVERLY...TO WEST UNION. MOVEMENT WAS TO THE NORTHEAST AT 35 MILES AN HOUR AND WILL BE AFFECTING THE TOWNS OF SHEFFIELD...MARBLE ROCK...CLARKSVILLE...WAVERLY... WEST UNION...AND CHARLES CITY. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR NORTH CENTRAL AND PORTIONS OF NORTHEAST IOWA. ATMOSPHERIC CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS TO DEVELOP WITHIN THIS WATCH AREA. PERSONS WITHIN THE WATCH AREA SHOULD REMAIN ALERT FOR ANY CHANGES IN THE WEATHER AND BE PREPARED TO TAKE ACTION IF A WARNING IS ISSUED. STAY TUNED TO YOUR TELEVISION...RADIO...OR NOAA WEATHER RADIO FOR FURTHER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
Special weather statement, Jul 8, 8:50 PM CDT, 19 minutes before
IAZALL-090245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 850 PM CDT THU JUL 8 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTH CENTRAL AND WESTERN IOWA UNTIL MIDNIGHT... AT 840 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST CENTRAL INTO NORTH CENTRAL AND NORTHEAST IOWA. THE STORMS WERE LOCATED IN A 20 MILE WIDE BAND EXTENDING FROM 40 MILES NORTHEAST OF COUNCIL BLUFFS...TO 40 MILES NORTHWEST OF DES MOINES NEAR JEFFERSON...TO FORT DODGE...TO 15 MILES NORTH OF WATERLOO NEAR SUMNER. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL. THE THUNDERSTORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND STORMS THAT WERE OCCURRING NORTH OF A LINE FROM COUNCIL BLUFFS TO 50 MILES NORTHEAST OF WATERLOO NEAR ELKADER. THE STORMS AND SHOWERS WERE MOVING EAST AT 30 MILES AN HOUR. / KALLMAN
Special weather statement, Jul 8, 8:50 PM CDT, 19 minutes before
IAZALL-090245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 850 PM CDT THU JUL 8 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTH CENTRAL AND WESTERN IOWA UNTIL MIDNIGHT... AT 840 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST CENTRAL INTO NORTH CENTRAL AND NORTHEAST IOWA. THE STORMS WERE LOCATED IN A 20 MILE WIDE BAND EXTENDING FROM 40 MILES NORTHEAST OF COUNCIL BLUFFS...TO 40 MILES NORTHWEST OF DES MOINES NEAR JEFFERSON...TO FORT DODGE...TO 15 MILES NORTH OF WATERLOO NEAR SUMNER. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL. THE THUNDERSTORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND STORMS THAT WERE OCCURRING NORTH OF A LINE FROM COUNCIL BLUFFS TO 50 MILES NORTHEAST OF WATERLOO NEAR ELKADER. THE STORMS AND SHOWERS WERE MOVING EAST AT 30 MILES AN HOUR. / KALLMAN
Special weather statement, Jul 8, 9:05 PM CDT, 4 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 905 PM CDT THU JUL 8 1993 ...THUNDERSTORMS CONTINUE TO DUMP HEAVY RAIN ACROSS NORTH CENTRAL AND NORTHEAST IOWA... AT 900 PM...STRONG THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS ALONG WITH WINDS NEAR 45 MILES AN HOUR. THESE THUNDERSTORMS WERE LOCATED FROM AROUND HAMPTON TO MARBLE ROCK AND SUMNER...ABOUT 35 MILES WEST OF WATERLOO AND 25 MILES NORTH. THIS RAIN COULD CAUSE SOME SMALL STREAMS AND POSSIBLE LOW LAND FLOODING IN THE CEDAR AND WAPSIPINICON RIVER BASIN. TOWNS EFFECTED BY THESE THUNDERSTORMS BETWEEN 910 PM AND 10 PM WILL BE NEW HAMPTON...NASHUA...FREDERICKSBURG AND ALPHA AS THEY MOVE NORTHEAST AT 25 MILES AN HOUR. THIS RAIN SITUATION SHOULD BE WATCHED CLOSELY. THE GROUND IS SATURATED AND STREAMS ARE ALREADY HIGHER THAN NORMAL. IF DRIVING TONIGHT DO NOT CROSS FLOODED ROADWAYS AND BE PREPARED TO MOVE TO HIGHER GROUND IF FLOODING STARTS TO OCCUR. STAY TUNED TO RADIO ...NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY 63. RR
Special weather statement, Jul 8, 9:08 PM CDT, 1 minute before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 905 PM CDT THU JUL 8 1993 ...THUNDERSTORMS CONTINUE TO DUMP HEAVY RAIN ACROSS NORTH CENTRAL AND NORTHEAST IOWA... AT 900 PM...STRONG THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS ALONG WITH WINDS NEAR 45 MILES AN HOUR. THESE THUNDERSTORMS WERE LOCATED FROM AROUND HAMPTON TO MARBLE ROCK AND SUMNER...ABOUT 35 MILES WEST OF WATERLOO AND 25 MILES NORTH. THIS RAIN COULD CAUSE SOME SMALL STREAMS AND POSSIBLE LOW LAND FLOODING IN THE CEDAR AND WAPSIPINICON RIVER BASIN. TOWNS EFFECTED BY THESE THUNDERSTORMS BETWEEN 910 PM AND 10 PM WILL BE NEW HAMPTON...NASHUA...FREDERICKSBURG AND ALPHA AS THEY MOVE NORTHEAST AT 25 MILES AN HOUR. THIS RAIN SITUATION SHOULD BE WATCHED CLOSELY. THE GROUND IS SATURATED AND STREAMS ARE ALREADY HIGHER THAN NORMAL. IF DRIVING TONIGHT DO NOT CROSS FLOODED ROADWAYS AND BE PREPARED TO MOVE TO HIGHER GROUND IF FLOODING STARTS TO OCCUR. STAY TUNED TO RADIO ...NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY 63. RR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 43 min |
| Jul 8, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 48 min |
| Jul 8, 8:05 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Greene, Guthrie | 55 min |
| Jul 8, 8:27 PM CDT | Flash Flood Warning | DMX | Carroll, Crawford, Greene | 4 hr |
| Jul 8, 8:57 PM CDT | Tornado Warning | DMX | Carroll, Crawford | 19 min |
| Jul 8, 9:29 PM CDT | Flash Flood Warning | DMX | Boone, Story | 4 hr |
| Jul 8, 9:29 PM CDT | Flash Flood Warning | DMX | Dallas, Guthrie | 4 hr |
| Jul 8, 9:31 PM CDT | Tornado Warning | DMX | Chickasaw | 29 min |
| Jul 8, 9:52 PM CDT | Tornado Warning | DMX | Boone, Dallas | 38 min |
| Jul 8, 10:03 PM CDT | Tornado Warning | DMX | Dallas, Polk | 27 min |
| Jul 8, 10:47 PM CDT | Flash Flood Warning | DMX | Black Hawk | 3 hr |
| Jul 8, 10:52 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 20 min |
| Jul 8, 11:25 PM CDT | Flash Flood Warning | DMX | Jasper, Polk | 5 hr |
| Jul 8, 11:25 PM CDT | Flash Flood Warning | DMX | Marshall | 5 hr |
| Jul 8, 11:40 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford | 35 min |
| Jul 8, 11:40 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Cass, Taylor | 35 min |
| Jul 8, 11:49 PM CDT | Flash Flood Warning | DMX | Buchanan | 3 hr |
| Jul 9, 12:02 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Ringgold, Union | 28 min |
| Jul 9, 12:02 AM CDT | Severe Thunderstorm Warning | DMX | Greene, Guthrie | 28 min |
| Jul 9, 12:22 AM CDT | Flash Flood Warning | DMX | Carroll, Greene | 4 hr |
| Jul 9, 12:22 AM CDT | Flash Flood Warning | DMX | Audubon | 4 hr |
| Jul 9, 12:33 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 27 min |
| Jul 9, 12:33 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur | 27 min |
| Jul 9, 1:01 AM CDT | Flash Flood Warning | DMX | Black Hawk | 119 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 25 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk | 25 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Warren | 25 min |
| Jul 9, 1:22 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 23 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 54 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Monroe, Wapello | 54 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Jasper | 49 min |
| Jul 9, 2:11 AM CDT | Severe Thunderstorm Warning | DMX | Jefferson, Keokuk, Van Buren, Washington | 49 min |
| Jul 9, 2:11 AM CDT | Severe Thunderstorm Warning | DMX | Iowa, Johnson | 49 min |
| Jul 9, 10:21 AM CDT | Flash Flood Warning | DMX | Story | 6 hr |
Nearby
Tornado Warnings in Iowa, 1993Every tornado warning in 1993Tornadoes 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.