A strong upper level low pressure was tracking southeast across South Dakota during the day. Iowa was on the edge of the cool pool associated with this low.
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The episode as NWS DMX wrote it up.
A strong upper level low pressure was tracking southeast across South Dakota during the day. Iowa was on the edge of the cool pool associated with this low. Severe parameters were not all that strong. During peak heating, there was an increase in 0-1 km storm relative helicity and the shear values did increase to around 30 kts. A line of thunderstorms formed along the edge of the cooler air. One of the storms produced a brief tornado in Hamilton County just west of Ellsworth. The tornado touched down in open area and caused little damage. There were also several reports of funnel clouds around Hamilton and Grundy Counties.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 1, 2:27 PM CST, 3 hours 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 327 PM CDT FRI JUN 1 2007 .DISCUSSION... MUCH OF THE CWA CAUGHT IN THE DRY PUNCH BETWEEN THE TWO LINES OF CONVECTION THIS AFTN. NEXT ROUND MOVING INTO WESTERN PART OF THE CWA. CAA PUNCH EVIDENT ON VSB SAT PIX WITH LARGE AREA OF CLOSED CONVECTION PRESENT. LINE IN WRN IA FORMING ON THE LEAD EDGE OF THAT AND COOL POOL ALF. MUCH OF THE SIG ACTION WITH THIS SHOULD BE IN THE EARLY HOURS TONIGHT. KEPT THE FFA OUT THROUGH 09Z, THOUGH MAY BE ABLE TO CANCEL IT EARLY DEPENDING ON WHEN THINGS WIND DOWN. MUCH OF AREA WHERE FFA IS OUT RECEIVED 3/4-1 INCH THIS MRNG, SO IT WOULDNT TAKE A WHOLE LOT. CONT UNSETTLED CONDS THRU THE WKND, BUT MORE DIURNAL IN NATURE AND NOT AS ORGANIZED AS PAST COUPLE DAYS. WX WL QUIET DOWN FOR A FEW DAYS ONCE THE UPR LOW MOVES TO THE E OF IA AND FLOW SHIFTS TO THE NW. NEXT ROUND OF ACTION LKELY TO BE INTO THE CENTRAL U.S. BY WED NGT WITH AN ACTV LAST PART OF NXT WK. && AVIATION 01/18Z... SOUTHERN TAFS HAVE VIS...PRECIP...AND CIG TAPERING OFF DURING THE FIRST PART OF FORECAST PERIOD. LEFT IN VICINITY SHOWERS THROUGH 20Z-21Z FOR OTM...DSM...AND FOD. NORTERN TAFS...PRECIP LOOKS TO END CLOSER TO 21Z-22Z. HAVE PRECIP REDEVELOP PAST 00Z-02Z...WITH VIS AND CIGS LOWERING OVERNIGHT. HAVE THESE HANDLED WITH TEMPO GROUPS. BY MORNING...PRECIP AND VIS LOOK TO IMPROVE AND MAINLY HAVE CIGS AROUND 5000 FEET AT THE END OF FORECAST PERIOD. && .DMX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR APPANOOSE-CLARKE- DAVIS-DECATUR-JASPER-LUCAS-MADISON-MAHASKA-MARION-MARSHALL- MONROE-POLK-POWESHIEK-RINGGOLD-STORY-TAMA-UNION-WAPELLO-WARREN- WAYNE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 351 PM CDT FRI JUN 1 2007 IAZ048>050-060>062-072>075-082>086-093>097-021100- STORY-MARSHALL-TAMA-POLK-JASPER-POWESHIEK-MADISON-WARREN-MARION- MAHASKA-UNION-CLARKE-LUCAS-MONROE-WAPELLO-RINGGOLD-DECATUR-WAYNE- APPANOOSE-DAVIS- 351 PM CDT FRI JUN 1 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTHERN IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT SHOWERS AND THUNDERSTORMS WILL BECOME MORE WIDESPREAD BY MID EVENING. EXPECT PERIODS OF LOCALLY HEAVY RAIN DURING THE LATE EVENING AND OVERNIGHT HOURS...WITH LOCAL AMOUNTS OF 1 TO 2 INCHES OF ADDITIONAL RAIN BY SATURDAY MORNING. AN ISOLATED SEVERE STORM WITH NICKEL SIZE HAIL IS POSSIBLE. A FLASH FLOOD WATCH IS IN EFFECT FOR THE AREA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORM CHANCES WILL CONTINUE INTO SATURDAY AND SUNDAY...ALTHOUGH THE THUNDERSTORMS ARE EXPECTED TO BE LESS INTENSE. ADDITIONALLY...A STORM SYSTEM BY MIDWEEK WILL BRING CHANCES FOR THUNDERSTORMS WEDNESDAY INTO THURSDAY THOUGH IT IS TOO EARLY TO TELL IF THE STORMS WILL BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT LIKELY TONIGHT...ALTHOUGH RAINFALL REPORTS WOULD BE APPRECIATED. IAZ004>007-015>017-023>028-033>039-044>047-057>059-070-071-081- 092-021100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE- BOONE-AUDUBON-GUTHRIE-DALLAS-CASS-ADAIR-ADAMS-TAYLOR- 351 PM CDT FRI JUN 1 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST THROUGH NORTH CENTRAL IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT EXPECTED SCATTERED THUNDERSTORMS THIS EVENING...INTO EARLY SATURDAY MORNING EAST OF INTERSTATE 35. AN ISOLATED STORM COULD PRODUCE NICKEL SIZED HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORM CHANCES WILL CONTINUE INTO SATURDAY AND SUNDAY...ALTHOUGH THE THUNDERSTORMS ARE EXPECTED TO BE LESS INTENSE. ADDITIONALLY...A STORM SYSTEM BY MIDWEEK WILL BRING CHANCES FOR THUNDERSTORMS WEDNESDAY INTO THURSDAY THOUGH IT IS TOO EARLY TO TELL IF THE STORMS WILL BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT LIKELY TONIGHT...ALTHOUGH RAINFALL REPORTS WOULD BE APPRECIATED. KINNEY
The Des Moines radar (KDMX), 66 km away, was scanning. The volume nearest the first event began at 23:29 UTC.
3 funnel cloud, 1 tornado. Local standard time, as filed.
Tornado touched down briefly in open fields west of Ellsworth.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2007Every state in 2007This day in weather historyThe tornado archive for Iowa, 2007Warnings in Iowa, June 2007
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: 24338, 24335, 24336, 24337.