The main warm front remained to the south of Iowa with most of the convection associated with it well to the south. An isolated thunderstorm developed over Davis County in the Drakesville area.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DMX wrote it up.
The main warm front remained to the south of Iowa with most of the convection associated with it well to the south. An isolated thunderstorm developed over Davis County in the Drakesville area. The storm produced damaging wind and quarter size hail.
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 18, 11:50 AM CST, 3 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 1250 PM CDT TUE JUN 18 2013 .UPDATE... ISSUED AT 945 AM CDT TUE JUN 18 2013 HAVE SENT OUT AN UPDATE TO REFINE POPS ACROSS THE NORTHEAST AND SOUTHWEST. HAVE INCREASED POPS ACROSS THE SOUTHWEST TO A SLIVER OF LIKELIES GIVEN THE COVERAGE OF LINGERING ACTIVITY...AND REDUCED POPS ACROSS THE NORTHEAST TO SLIGHT CHANCE GIVEN THE SMALL AREAL COVERAGE AND LIKELIHOOD THAT THE MAJORITY OF ACTIVITY WILL SKIRT BY THE CWA JUST TO THE EAST. SOUNDINGS STILL INDICATE SOME INSTABILITY BY THE AFTERNOON HOURS IN THE WATERLOO/MASON CITY AREA. THEREFORE HAVE LEFT A SMALL AREA OF SLIGHT CHANCE POPS...HOWEVER MAIN FORCING WILL SLIDE OFF TO THE SOUTHEAST WITH THE UPPER LEVEL SHORTWAVE SO DO NOT EXPECT WIDESPREAD CHANCES. ALSO LOWERED MAX TEMPS A FEW DEGREES ACROSS THE FAR SOUTHWEST IN VICINITY OF THE THUNDERSTORMS/CLOUD COVER...OTHERWISE REMAINDER OF FORECAST LOOKS ON TRACK. && .SHORT TERM.../TODAY/... ISSUED AT 328 AM CDT TUE JUN 18 2013 COMBINATION OF INVERTED TROUGH EXTENDING FROM CENTRAL IL INTO SWRN MN INTO THE RED RIVER VALLEY...COMBINED WITH RATHER STRONG S/WV ROTATING SOUTHEAST INTO SRN MN AND SPEED MAX MOVING INTO NWRN IA HAS RESULTED IN VIGOROUS CONVECTION IN SOUTHWEST MN...ALBEIT ONE MAIN CELL. THOUGH PARAMETERS ARE WEAK...BEING ISOLATED IT HAS BEEN ABLE TO MAINTAIN ITSELF. EXPECT TO SEE SCATTERED CONVECTION DEVELOP IN THE VICINITY OF THE FRONT AS S/WV ROTATES THROUGH TODAY. THE BEST CHANCE IS IN THE MORNING BEFORE THE S/WV PASSES THE AREA. FEEL THE NAMDNG5/ECMWF AND TO A DECENT AMOUNT THE GFS HAS A PRETTY GOOD HANDLE ON THE PRECIP AREA. INITIALLY DISCOUNTED THE NAM12/HRRR AND SOME OF THE OTHER HIRES MODELS WITH THE DEVELOPMENT OVER WRN IA...HOWEVER SOME DEVELOPMENT HAS OCCURRED IN RESPONSE TO THE PASSAGE OF THE SPEED MAX PUTTING SWRN IA IN THE RIGHT INFLOW REGION. TEMPS TODAY WILL BE A LITTLE COOLER THAN YESTERDAY WITH INCREASE CLOUDS AND AND SOME CAA AT H8. GENERALLY MID 70S TO AROUND 80...A FEW DEGREES WARMER IN HEAT ISLAND AREAS. .LONG TERM.../TONIGHT THROUGH MONDAY/... ISSUED AT 328 AM CDT TUE JUN 18 2013 WEAK RIDGE WILL REMAIN IN PLACE ACROSS CENTRAL PLAINS FOR THE BEGINNING OF THE PERIOD. SHORTWAVE TO PUSH EAST ACROSS RIDGE WILL BRING PRECIPITATION CHANCES FOR WEDNESDAY. HOWEVER TIMING IS STILL A BIT UNCERTAIN...WITH MODELS IN POOR AGREEMENT ON TIMING OF WAVE. HAVE KEPT TIMING NEAR GOING. MODELS DO INDICATE A SLIGHTLY FURTHER SOUTH SOLUTION...WITH BEST PRECIPITATION CHANCES ACROSS SOUTHERN IOWA/NORTHERN MISSOURI...AND HAVE BEGUN TO TREND POPS THAT WAY FOR LATE WEDNESDAY AND EARLY THURSDAY. DO HAVE SOME CONCERNS FOR SEVERE WEATHER LATE WEDNESDAY AFTERNOON...WITH CAPE VALUES 1000-2000 J/KG INDICATED...AND LITTLE IN THE WAY OF CAP. WEAK CAP MAY BE ENOUGH TO HOLD OFF CONVECTION WITH LITTLE FORCING. HAIL/WIND WOULD BE THE MAIN THREATS FROM ANY SEVERE STORMS. TEMPERATURES WILL WARM STEADILY THROUGH THE PERIOD UNDER THE RIDGE...WITH PRIMARILY SOUTHERLY FLOW AT THE SURFACE. UPPER LEVEL LOW PUSHING EAST ACROSS CANADA WILL DROP A FRONTAL BOUNDARY ACROSS NORTHERN PLAINS FOR THURSDAY/FRIDAY. MODELS HAVE SPED UP TIMING A BIT ON THIS SYSTEM...AND HAVE THERE FORE CUT BACK ON POPS ACROSS THE SOUTH FOR LATE FRIDAY. LARGE UPPER LEVEL LOW PRESSURE SYSTEM EXPECTED TO PUSH ONSHORE IN PAC NW FOR END OF WEEK WILL INFLUENCE WEATHER ACROSS IOWA FOR MUCH OF THE REMAINDER OF THE PERIOD. AS THIS IS STILL OFF THE SHORE AND POORLY SAMPLED...DO NOT HAVE HIGH CONFIDENCE IN TIMING...THOUGH MODELS ARE IN DECENT AGREEMENT. AS LOW DIGS ACROSS THE ROCKIES...RIDGE LIFTS ACROSS IOWA...WITH SHORTWAVES LIFTING THROUGH RIDGE. HOWEVER...TIMING/LOCATION AGAIN PROBLEMATIC. LATEST MODEL RUNS KEEP TRACKS WEST AND NORTH OF IOWA...AND HAVE TRENDED TOWARDS THIS SOLUTION FOR THE WEEKEND KEEPING POPS OUT OF THE SOUTH. && .AVIATION...18/18Z ISSUED AT 1245 PM CDT TUE JUN 18 2013 MAINLY VFR CONDITIONS EXPECTED THROUGH THIS EVENING...WITH POSSIBILITY FOR VSBYS TO DROP TO MVFR IN SOME LIGHT FOG LATE TONIGHT. SOME INSTABILITY AROUND THIS AFTERNOON SUGGESTING POTENTIAL FOR AN ISOLATED TSRA NEAR KMCW...KALO...AND KOTM. HOWEVER UNCERTAINTY IS HIGH AS UPPER LEVEL DISTURBANCE IS EXITING THE AREA...THIS LEFT OUT ANY MENTION OF THUNDER IN THE TAFS AT THIS TIME. WINDS TO SHIFT AROUND TO THE EAST/SOUTHEAST THROUGH THE PERIOD...WITH MOISTURE INCREASING ALOFT LATE TONIGHT. THEREFORE EXPECT SOME LOW/MID VFR CIGS BY EARLY WEDNESDAY MORNING ACROSS THE WESTERN TAF SITES. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && UPDATE...BEERENDS SHORT TERM...MS JUN 13 LONG TERM...AWB AVIATION...BEERENDS
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE DES MOINES IA 503 AM CDT TUE JUN 18 2013 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-191100- 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-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER- POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION- CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE- DAVIS- 503 AM CDT TUE JUN 18 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED NON SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA IN THE MORNING AND AFTERNOON HOURS TODAY. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL BE POSSIBLE AT TIMES ACROSS THE AREA WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE FOR SEVERE WEATHER WEST OF INTERSTATE 35 ON WEDNESDAY...AND NORTH OF INTERSTATE 80 ON THURSDAY...LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS. IT IS TOO EARLY TO DETERMINE THE THREAT FOR SEVERE WEATHER FOR THE REMAINDER OF THE PERIOD AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED AT TIMES WEDNESDAY AND THURSDAY. AWB
The Des Moines radar (KDMX), 139 km away, was scanning. The volume nearest the first event began at 20:59 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Tree limbs were blown down with damage to camping equipment. A power pole was broken with a line down at Lake Wapello State Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2013Every state in 2013This day in weather historyWarnings in Iowa, June 2013
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: 447565, 447564.