A line of thunderstorms produced a wind gust of 63 miles per hour at the Northeast Iowa Regional airport just outside of Charles City (Floyd County) in the evening hours of August 8th.
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The episode as NWS ARX wrote it up.
A line of thunderstorms produced a wind gust of 63 miles per hour at the Northeast Iowa Regional airport just outside of Charles City (Floyd County) in the evening hours of August 8th.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS La Crosse, WI wrote its last area forecast discussion before the first event at Aug 8, 5:37 PM CST, 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LA CROSSE WI 637 PM CDT WED AUG 8 2012 .SHORT TERM... 637 PM CDT WED AUG 8 2012 HAVE UPDATED THE FORECAST TO ACCOUNT FOR THE EASTWARD PROGRESS OF CURRENT RAIN AND STORMS AREA SEEN OVER SOUTHEAST MINNESOTA AND NORTHEAST IOWA. IDEA IS THAT PRECIPITATION WILL SPREAD EAST ANCHORED ON CONVERGENCE IN THE INVERTED TROUGH AREA EXTENDING FROM THE LOW CENTER SOUTHWEST OF MASON CITY IOWA. EXPECT THE STORMS TO USE THE AVAILABLE MLCAPE AROUND 1000 J/KG OVER NORTHCENTRAL IOWA AND CONTINUE TO SLOWLY WORK SE OVER NEXT HOURS. FURTHER NORTHEAST INTO WRN WI NEAR KLSE...EXPECT LESS CONVECTIVE COVERAGE AND MAINLY RA/-RA TO AFFECT THE AREA FROM 8-11 PM. INTENSITY WILL SLOWLY DIMINISH THROUGH NEXT FEW HOURS. ISOLATED SVR CANNOT BE RULED OUT IN NERN IA. .LONG TERM...SUNDAY THROUGH WEDNESDAY 304 PM CDT WED AUG 8 2012 08.12 MEDIUM RANGE MODELS ARE INDICATING THE SHORTWAVE TROUGH WILL SLIDE ACROSS THE REGION DURING THE DAY ON SUNDAY INTO SUNDAY NIGHT. THIS SYSTEM WILL BRING A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS TO THE AREA. THE COOLER TEMPERATURES WILL CONTINUE ON SUNDAY WITH HIGHS ONCE AGAIN IN THE 70S. TEMPERATURES ARE EXPECTED TO WARM THROUGH THE MIDDLE OF THE WEEK AS A TROUGH MOVES INTO THE PACIFIC NORTHWEST AND UPPER LEVEL RIDGING ATTEMPTS TO BUILD INTO THE FORECAST AREA. THE ECMWF IS SHOWING 850 MB TEMPERATURES WARMING INTO THE 18 TO 22 C ON TUESDAY. PLAN ON HIGHS CLIMBING BACK INTO THE 80S TO AROUND 90 TUESDAY INTO WEDNESDAY. A POTENT COLD FRONT AND UPPER TROUGH IS EXPECTED TO IMPACT THE REGION TUESDAY INTO WEDNESDAY. THIS SYSTEM WILL BRING HIGH CHANCES FOR SHOWERS AND THUNDERSTORMS TO THE AREA. A LITTLE TOO FAR OUT TO NAIL DOWN EXACT DETAILS ON IF THERE WOULD BE A SEVERE THREAT..BUT WILL HAVE TO KEEP A CLOSE WATCH ON THIS THE NEXT FEW DAYS. && .AVIATION...TONIGHT AND THURSDAY 635 PM CDT WED AUG 8 2012 HAVE INCLUDED SOME RA IN THE KLSE TAF BASED ON CURRENT RADAR AND TIMING. BASED ON A SHRA AT KONA AND 2 1/2 SM REPORTED LAST HOUR...HAVE DECIDED TO LOWER THE VSBY A BIT BASED ON PERIODIC RA/RA+ IN THE -SHRA ACTIVITY AT KLSE. WITH LIMITED INSTABILITY AND MORE -RA EXPECTED...HAVE NOT INCLUDED A TS MENTION IN THE TAF AT KLSE THIS EVENING. && .ARX WATCHES/WARNINGS/ADVISORIES... 304 PM CDT WED AUG 8 2012 WI...NONE. MN...NONE. IA...NONE. && SHORT TERM...BAUMGARDT LONG TERM...WETENKAMP AVIATION...BAUMGARDT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 500 AM CDT WED AUG 8 2012 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032>034- 041>044-053>055-061-091100- ADAMS-ALLAMAKEE-BUFFALO-CHICKASAW-CLARK-CLAYTON-CRAWFORD-DODGE- FAYETTE-FILLMORE-FLOYD-GRANT-HOUSTON-HOWARD-JACKSON-JUNEAU-LA CROSSE- MITCHELL-MONROE-MOWER-OLMSTED-RICHLAND-TAYLOR-TREMPEALEAU-VERNON- WABASHA-WINNESHIEK-WINONA- 500 AM CDT WED AUG 8 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST IOWA... SOUTHEAST MINNESOTA...SOUTHWEST INTO CENTRAL WISCONSIN. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT. ANY STORMS THAT DEVELOP ARE NOT EXPECTED TO REACH SEVERE LEVELS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ISOLATED THUNDERSTORMS WILL REMAIN POSSIBLE ON THURSDAY AS THE STORM SYSTEM CONTINUES TO MOVE THROUGH THE REGION. AGAIN...NO SEVERE WEATHER IS EXPECTED. THERE IS ALSO A CHANCE FOR A FEW THUNDERSTORMS ALONG AND SOUTH OF INTERSTATE 94 FROM SATURDAY NIGHT INTO SUNDAY. AT THIS TIME...IT APPEARS THAT ANY RISK OF SEVERE WEATHER IS LOW WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED. .EMERGENCY MANAGEMENT COORDINATION... NO WEBINAR IS SCHEDULED. MW
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 342 PM CDT WED AUG 8 2012 MNZ086-087-094-082115- DODGE-MOWER-OLMSTED- 342 PM CDT WED AUG 8 2012 ...STRONG THUNDERSTORM MOVING ACROSS PARTS OF DODGE...MOWER AND OLMSTED COUNTIES... AT 336 PM...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SARGEANT...MOVING EAST AT 20 MPH. WIND GUSTS OF 40 TO 50 MPH...SMALL HAIL AND TORRENTIAL DOWNPOURS MAY ACCOMPANY THIS THUNDERSTORM. LOCATIONS THAT MAY BE AFFECTED INCLUDE... OSLO...HAYFIELD...ROCK DELL...WALTHAM...INTERSTATE 90 AND COUNTY 1. ZT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 430 PM CDT WED AUG 8 2012 MNZ086-087-094-095-082200- DODGE-FILLMORE-MOWER-OLMSTED- 430 PM CDT WED AUG 8 2012 ...STRONG THUNDERSTORMS EXPECTED IN DODGE...FILLMORE...MOWER AND OLMSTED COUNTIES... AT 428 PM...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS FROM BLOOMING PRAIRIE TOWARD INTERSTATE 90 NEAR STEWARTVILLE...MOVING EAST AT 15 MPH. WIND GUSTS OF 40 TO 50 MPH...SMALL HAIL AND TORRENTIAL DOWNPOURS MAY ACCOMPANY THIS STRONG THUNDERSTORM. LOCATIONS THAT MAY BE AFFECTED INCLUDE... GRAND MEADOW...I 90 EXIT 205...HIGH FOREST...STEWARTVILLE...I 90 EXIT 209...RACINE AND HIGHWAYS 63 AND 16. HEAVY RAIN COULD LEAD TO MINOR FLOODING OR A SHORT PERIOD OF STANDING WATER. STAY CLEAR OF DRAINAGE AREAS AND AVOID AREAS OF HIGH WATER IF THEY DEVELOP. SMALL HAIL MAY FALL FOR SEVERAL MINUTES AND COVER THE GROUND. THIS COULD LEAD TO DIFFICULT DRIVING CONDITIONS AND THE FORMATION OF FOG. HALBACH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 521 PM CDT WED AUG 8 2012 IAZ008-MNZ086-087-094-095-082330- DODGE-FILLMORE-MITCHELL-MOWER-OLMSTED- 521 PM CDT WED AUG 8 2012 AT 505 PM...DOPPLER RADAR INDICATED SHOWERS AND SOME STRONG THUNDERSTORMS FROM NEAR STEWARTVILLE...OR I-90 SOUTH OF ROCHESTER...THROUGH AUSTIN...TO NORTH OF MASON CITY ALONG I-35. THIS AREA OF WEATHER IS MOVING VERY SLOWLY TO THE SOUTHEAST AT 20 MPH. WITH THE STRONGER STORMS...PEA TO DIME SIZED HAIL...WIND GUSTS OF 40 TO 50 MPH...DEADLY LIGHTNING...AND TORRENTIAL DOWNPOURS ARE POSSIBLE. AN ISOLATED AND BRIEF TORNADO CANNOT BE RULED OUT...AND IT WOULD BE MOST POSSIBLE WITH STORMS WHERE IT HAS NOT RAINED PREVIOUSLY TODAY. LOCATIONS THAT MAY BE AFFECTED THROUGH 630 PM INCLUDE... STACYVILLE...SPRING VALLEY...LYLE...STACYVILLE...ST. ANSGAR...LE ROY AND OSAGE. HEAVY RAIN COULD LEAD TO MINOR FLOODING OR A SHORT PERIOD OF STANDING WATER. THERE IS A CHANCE THAT A SEVERE THUNDERSTORM WARNING MAY BE NEEDED FOR LOCALIZED AREAS THROUGH 7 PM. TAKE SHELTER IF STORMS APPROACH. BAUMGARDT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 627 PM CDT WED AUG 8 2012 IAZ008>010-018-019-MNZ094-095-090030- CHICKASAW-FILLMORE-FLOYD-HOWARD-MITCHELL-MOWER-WINNESHIEK- 627 PM CDT WED AUG 8 2012 ...STRONG STORMS OVER SOUTHEAST MINNESOTA AND NORTHEAST IOWA... AT 616 PM...DOPPLER RADAR INDICATED A LINE OF RAIN AND STRONG THUNDERSTORMS FROM SPRING VALLEY MINNESOTA...TO NEAR LE ROY...TO NEAR OSAGE...TO JUST WEST OF CHARLES CITY...TOWARD IOWA FALLS. THIS LINE IS MOVING SOUTHEAST SLOWLY AT 20 TO 30 MPH. WIND GUSTS OF 40 TO 50 MPH...TORRENTIAL DOWNPOURS AND FREQUENT DANGEROUS LIGHTNING WILL ACCOMPANY THE STRONGEST THUNDERSTORMS. LOCATIONS IN IOWA THAT MAY BE AFFECTED THROUGH 730 PM INCLUDE...MARBLE ROCK...CHARLES CITY...OSAGE...NEW HAMPTON...AND CRESCO. IN MINNESOTA THROUGH 7 PM...LE ROY...OSTRANDER...AND YORK. PREPARE NOW FOR POSSIBLE STRONG STORMS. MOVE INDOORS WHEN STORMS APPROACH AS LIGHTNING WILL BE A THREAT. IF A WARNING IS ISSUED...TAKE ACTIONS TO PROTECT LIFE AND PROPERTY. BAUMGARDT
The La Crosse radar (KARX), 142 km away, was scanning. The volume nearest the first event began at 23:44 UTC.
1 thunderstorm wind. Local standard time, as filed.
The automated weather observing system at the Charles City airport measured a wind gust of 63 miles per hour.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2012Every state in 2012This day in weather historyWarnings in Iowa, August 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 403490.