Hail, Davis
- When
- July 19, 6:58 AM CST
- Where
- Davis County, 2.96 mi ENE of Mark
- Measured
- 0.95 in hail
- Crop damage
- $5,000
- Reported by
- Trained Spotter
- Coordinates
- 40.670, -92.530
Hail in Iowa, July 19, 2010
An area of thunderstorms formed north of a stationary front which extended east to west just to the south of Iowa. CAPE was around 1000 J/kg just to the south of the storms, however strong theta-e advection was taking place.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- $5,000
- Events
- 1
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.
What happened
The episode as NWS DMX wrote it up.
An area of thunderstorms formed north of a stationary front which extended east to west just to the south of Iowa. CAPE was around 1000 J/kg just to the south of the storms, however strong theta-e advection was taking place. A strong shear gradient existed with 35 to 50 kts of shear just to the south of the thunderstorm area. Downdraft CAPE in advance of the storms was around 1000 J/kg. Available CAPE in the -10 to -30 C layer of the atmosphere was in the 100 to 200 J/kg range. The storms were marginal at best through the night with wind gusts of 40 to 50 MPH and hail up to one half inch in diameter. One of the storms became stronger shortly after sunrise over southeast Iowa and produced hail between nickle and quarter size.
What forecasters said that day
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 Jul 19, 5:26 AM CST, 1 hour 32 minutes earlier.
Area forecast discussion, Jul 19, 5:26 AM CST, 1 hour 32 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 624 CDT MON JUL 19 2010 .SHORT TERM /TODAY/... COMPLICATED WX STTN TODAY WITH MULTIPLE FEATURES TO MONITOR. INITIAL PROBLEM IS WITH THE MCS OVR NERN NEBRASKA INTO WRN IA. SUPPORT ISN/T THE GREATEST FOR IT...BUT ENUF TO BE A MARGINAL SEVERE EVENT. FOCUS WILL TURN TO DVLPMT LATER FROM THE AREA OVR SD. FEEL THAT WILL ROLL DOWN AND INTENSIFY OVR THE COURSE OF THE DAY. SIG CAPE AND DECENT PROFILE SUGGEST SPC MOD OUTLOOK IS ON TRACK WITH A SIG WIND THREAT IN THE WORKS. 4.5 KM WRF SEEMS TO HAVE A REALISTIC PRESENTATION OF THE OVERALL TRENDS. TEMPS ARE A PROB WITH CONVECTION AND ALL THE CLOUDINESS. CUT MOS WITH EXPECTATION OF WDSPRD CLOUD COVER AND LITTLE CHC FOR RECOVERY. AFTN CONVECTION WILL BE DRIVEN BY EXTREMELY UNSTABLE AIR TO THE S OF THE BOUNDARY AND STRONG THETA-E ADVECTION. THAT WON/T BE STOPPED...SO NEITHER WILL CONT DVLPMT. .LONG TERM.../TONIGHT THROUGH SUNDAY/ MUCH OF THIS PERIOD...AT LEAST THROUGH THIS WORK WEEK...WILL REMAIN QUITE ACTIVE ACROSS IA BOTH IN TERMS OF SVR WX AND HEAVY RAINS. MOST MODELS ARE IN AGREEMENT WITH THE GENERAL SCENARIO OF GRADUALLY LIFTING CURRENT KS/MO BOUNDARY AND ASSOCIATED WARM ADVECTION ZONE NORTHWARD THROUGH IA THROUGH THE WORK WEEK AS THE SERIES OF SHORT WAVES AND SPEED MAXES CONTINUE TO TRACK THROUGH NRN PLAINS WESTERLIES. JET IS FAR ENOUGH NORTH TO INTRODUCE IA TO FAVORABLE HEAVY RAIN PARAMETERS SUCH AS HIGH PWS/WCDS...BUT NOT FAR ENOUGH NORTH TO REMOVE US FROM DEEP SHEAR. THIS PUTS US IN THE UNPLEASANT POSITION OF HAVING REPETITIVE SVR WX AND HEAVY RAIN MCS EVENTS. FORECAST REMAINS ESSENTIALLY UNCHANGED DUE TO CONVECTIVE UNCERTAINLY REGARDING CONVECTIVE DEBRIS AND PLACEMENT OF OUTFLOW BOUNDARIES. MODELS SEEM TO HAVE A GOOD HANDLE OF MCS PLACEMENT AND TIMING...BUT CONFIDENCE IN LOCATION AND TIMING IS NOT HIGH ENOUGH TO BOOST POPS TOO MUCH IN LATTER PERIODS SUCH AS WED NIGHT...BUT THIS WILL HAVE TO BE MONITORED. PATTERN LOOKS TO FINALLY CHANGE TOWARD THE END OF THE WEEK AS NWRN THROUGH EVENTUALLY BECOMES PROGRESSIVE ENOUGH TO PUSH FRONT THROUGH DURING PEAK HEATING FRI. HAVE JUST BUMPED UP POPS FRI NIGHT FOR THIS SCENARIO...BUT NO OTHER CHANGES AT THE MOMENT AS THEY ARE BEYOND THE SCOPE OF THIS FORECAST CYCLE. HAVE ADDED HEAVY RAIN AND SVR MENTION TO THIS EVENING WITH SVR MCS LIKELY ALREADY IN PROGRESS...AND WILL ALSO CONTINUE HYDROLOGIC OUTLOOK /ESF/ HIGHLIGHTING HEAVY RAIN POTENTIAL FOR LATER DAYS TOO. WOULD IMAGINE THAT FLASH FLOOD WATCHES WILL NEED TO BE ISSUED IN THE COMING DAYS WHEN DETAILS BECOME MORE CLEAR. TEMP WISE STAYED NEAR GUIDANCE FOR THE MOST PART...BUT DID GO JUST ABOVE MOS FOR HIGHS WED PER SUGGESTIONS FROM SOUNDINGS. && .AVIATION...19/12Z COMPLEX WX STTN WITH TSRA AFFECTING THE SWRN 3 TAF SITES ERY...ISOLD IN THE KMCW AND KALO AREA. CONVECTION SHOULD BCM LESS WDSPRD BY MID TO LATE MRNG. REDEVELOPMENT WILL DROP A LARGE AREA OF THE STATE IN TO MVFR AND SOME IFR CONDS IN TSRA AND CB BASES THIS AFTN AND EVE. SOME IMPVMT OVR NGT...BUT TSRA WON'T TOTALLY LEAVE THE PICTURE THRUT TAF PD. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...MS JUL 10 LONG TERM...BSS AVIATION...MS JUL 10
Hazardous weather outlook, Jul 19, 5:01 AM CST, 1 hour 57 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 601 AM CDT MON JUL 19 2010 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-201115- 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- 601 AM CDT MON JUL 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT. SOME OF THESE STORMS MAY BE SEVERE WITH DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES. THE GREATEST POTENTIAL FOR SEVERE WEATHER IS CURRENTLY THROUGH CENTRAL IOWA...HOWEVER THE EVOLUTION OF THUNDERSTORMS THIS MORNING MAY ALTER THAT SCENARIO AND EVENTUALLY PUSH IT SOUTHWARD. MONITOR LATER OUTLOOKS AND STATEMENTS FOR SEVERE WEATHER UPDATES THROUGHOUT THE DAY. HEAVY RAINS OF TWO TO FOUR INCHES MAY OCCUR BY TONIGHT...WITH LOCALLY HIGHER AMOUNTS POSSIBLE. THIS MAY LEAD TO FLASH FLOODING IN AREAS WHERE THUNDERSTORMS OCCUR REPETITIVELY. RIVER FLOOD WARNINGS ALSO REMAIN IN EFFECT FOR PORTIONS OF CENTRAL AND SOUTHEAST IOWA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THIS ACTIVE PATTERN WILL REMAIN IN PLACE THROUGH MUCH OF THE WORK WEEK WITH SEVERAL PERIODS OF THUNDERSTORMS. SOME OF THESE MAY PRODUCE SEVERE WEATHER...HEAVY RAINS...POSSIBLY IN EXCESS OF SEVERAL INCHES...AND POTENTIALLY FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT...AND OFF AND ON THROUGH THE REMAINDER OF THE WORK WEEK. REPORTS OF HEAVY RAIN AND FLOODING MAY BE NEEDED AS WELL AND ARE ALWAYS ENCOURAGED. SMALL
In the hours before
Special weather statement, Jul 19, 3:07 AM CST, 3 hours 51 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 407 AM CDT MON JUL 19 2010 IAZ057-190930- AUDUBON- 407 AM CDT MON JUL 19 2010 ...SIGNIFICANT WEATHER ADVISORY... AT 404 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER NORTHEASTERN SHELBY COUNTY...MOVING SOUTHEAST AT 15 MPH. PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... GRAY AND 7 MILES NORTHWEST OF AUDUBON BY 430 AM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
Special weather statement, Jul 19, 3:34 AM CST, 3 hours 24 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 434 AM CDT MON JUL 19 2010 IAZ044-045-057-058-070>072-083-191000- ADAIR-AUDUBON-CARROLL-CASS-CLARKE-CRAWFORD-GUTHRIE-MADISON- 434 AM CDT MON JUL 19 2010 ...SIGNIFICANT WEATHER ADVISORY... AT 432 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM WEST CENTRAL CRAWFORD COUNTY TO CENTRAL CLARKE COUNTY...MOVING NORTHEAST AT 15 MPH. PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS. LOCAL RAINFALL OF AN INCH IN AN HOUR IS POSSIBLE. * THUNDERSTORMS WILL BE NEAR... AUDUBON AIRPORT AND OSCEOLA BY 445 AM CDT... MANILLA AND AUDUBON BY 450 AM CDT... DENISON AIRPORT AND CASEY BY 455 AM CDT... DENISON AND ASPINWALL BY 500 AM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.
Special weather statement, Jul 19, 4:28 AM CST, 2 hours 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 528 AM CDT MON JUL 19 2010 IAZ070-191100- CASS- 528 AM CDT MON JUL 19 2010 ...SIGNIFICANT WEATHER ADVISORY... AT 527 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER NORTHEASTERN POTTAWATTAMIE COUNTY...MOVING SOUTHEAST AT 45 MPH. PENNY SIZE HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... MARNE BY 540 AM CDT... ATLANTIC AIRPORT BY 545 AM CDT... LEWIS AND ATLANTIC BY 550 AM CDT... CUMBERLAND BY 600 AM CDT... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
Special weather statement, Jul 19, 4:59 AM CST, 1 hour 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 559 AM CDT MON JUL 19 2010 IAZ057-070-071-081-191130- ADAIR-ADAMS-AUDUBON-CASS- 559 AM CDT MON JUL 19 2010 ...STRONG THUNDERSTORMS CONTINUE MOVING SOUTHEAST... AT 553 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM SOUTHEASTERN AUDUBON COUNTY TO CENTRAL CASS COUNTY TO SOUTHEASTERN POTTAWATTAMIE COUNTY... MOVING SOUTHEAST AT 40 MPH. ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS WITH AN INCH OR MORE OF RAIN...ARE POSSIBLE WITH THESE STORMS. * THUNDERSTORMS WILL BE NEAR... ADAIR AND CUMBERLAND BY 605 AM CDT... MASSENA BY 610 AM CDT... BRIDGEWATER BY 615 AM CDT... FONTANELLE BY 620 AM CDT... GREENFIELD AND CARBON BY 625 AM CDT... CORNING AND ORIENT BY 630 AM CDT... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.
Special weather statement, Jul 19, 6:11 AM CST, 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 711 AM CDT MON JUL 19 2010 IAZ083-084-092>096-191315- APPANOOSE-CLARKE-DECATUR-LUCAS-RINGGOLD-TAYLOR-WAYNE- 711 AM CDT MON JUL 19 2010 ...SIGNIFICANT WEATHER ADVISORY... AT 709 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM CENTRAL LUCAS COUNTY TO NORTHWESTERN DECATUR COUNTY TO EAST CENTRAL TAYLOR COUNTY...MOVING SOUTHEAST AT 40 MPH. PENNY SIZE HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS. ONE INCH OF RAIN IS LIKELY FROM THE STORMS. * THUNDERSTORMS WILL BE NEAR... HUMESTON AND GARDEN GROVE BY 720 AM CDT... MOUNT AYR AND MALOY BY 725 AM CDT... MILLERTON AND KELLERTON BY 730 AM CDT... LAMONI AIRPORT AND DAVIS CITY BY 740 AM CDT... PROMISE CITY AND PLANO BY 745 AM CDT... MYSTIC AND SEYMOUR BY 750 AM CDT... NUMA BY 755 AM CDT... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.
Special weather statement, Jul 19, 6:20 AM CST, 38 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 720 AM CDT MON JUL 19 2010 IAZ096-097-191245- APPANOOSE-DAVIS- 720 AM CDT MON JUL 19 2010 ...HEAVY THUNDERSTORMS WITH HEAVY RAINFALL EXPECTED... AT 717 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER CENTRAL APPANOOSE COUNTY...MOVING SOUTHEAST AT 35 MPH. ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... MOULTON BY 730 AM CDT... 8 MILES SOUTHWEST OF DRAKESVILLE BY 740 AM CDT... BLOOMFIELD BY 745 AM CDT... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
The radar
The Des Moines radar (KDMX), 155 km away, was scanning. The volume nearest the first event began at 13:00 UTC.
Event by event
1 hail. Local standard time, as filed.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Winds and Lightning Strikes in New Jersey, July 19, 2010
- Heat in Tennessee, July 19 to 22, 2010
- Hail and Damaging Winds in South Dakota, July 19, 2010
- Hail and Damaging Winds in Illinois, July 19, 2010
- Flash Flooding and Lightning Strike in Iowa, July 19 to 20, 2010
- Hail and Damaging Wind in Wyoming, July 19, 2010
- Flash Flood and Damaging Winds in Tennessee, July 19, 2010
- Flash Flooding and Hail in Iowa, July 19 to 20, 2010
- Flood and Hail in Massachusetts, July 19, 2010
- Hail and Damaging Winds in New York, July 19, 2010
- Excessive Heat in Kansas, July 19 to 20, 2010
- Hail in South Dakota, July 19, 2010
More
Every storm in Iowa in 2010Every state in 2010This day in weather historyWarnings in Iowa, July 2010
Sources
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: 233547.