Heavy rains resulted in flash flooding in Lone Tree, IA during the late night of July 30 and early morning of July 31.
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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 DVN wrote it up.
Heavy rains resulted in flash flooding in Lone Tree, IA during the late night of July 30 and early morning of July 31.
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 Quad Cities, IA wrote its last area forecast discussion before the first event at Jul 30, 2:25 PM CST, 6 hours 49 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 325 PM CDT FRI JUL 30 2010 .SYNOPSIS... 12Z UA ANALYSIS HAS AN H85 WARM FRONT FROM THE DAKOTAS INTO IOWA AND CENTRAL ILLINOIS. DEW POINTS WEST AND SOUTH OF THE H85 FRONT WERE IN THE MID AND UPPER TEENS. A NICE SHORTWAVE WAS ACROSS THE NORTHERN PLAINS AT H7 WITH STRONG HEIGHT FALLS IN SOUTHERN MINNESOTA. SATELLITE/RADAR TRENDS INDICATE THE NOCTURNAL MCS CONTINUES TO DECAY WITH NEW CONVECTION FIRING IN NORTHERN MISSOURI/SOUTHERN IOWA. 18Z SFC ANALYSIS IS QUITE NOISY WITH NUMEROUS MESOSCALE FEATURES. AN OUTFLOW BOUNDARY WAS ACROSS SOUTHERN/EASTERN IOWA WITH A WARM FRONT ACROSS NORTHERN MISSOURI INTO SOUTHERN ILLINOIS. A MORE PRONOUNCED WARM FRONT RAN FROM NORTHEAST KANSAS INTO THE LOWER OHIO VALLEY. DEW POINTS AROUND THE WARM FRONTS WERE IN THE LOW TO MID 70S WITH 60S OVER MOST OF THE UPPER MIDWEST. && .SHORT TERM...TONIGHT AND SATURDAY... THE MODELS CONTINUED TO POORLY INITIALIZE THE MOISTURE IN THE LOWER LEVELS WHICH SIGNIFICANTLY AFFECTS THE NEXT 12 HRS. CURRENT DECAYING MCS TO CONTINUE MOVING SOUTH/EAST. 18Z RUC POINTS TO A NEW MCS FIRING IN NORTHERN MISSOURI WITH PROPAGATION VECTORS INDICATING A GENERAL EASTERLY MOVEMENT. RUC ALSO HAS VERY STRONG MOISTURE/WIND CONVERGENCE DEVELOPING ACROSS THE SOUTHERN CWFA THIS EVENING. ALL THIS COMBINED WITH PWATS NEAR 2 INCHES WILL RESULT IN EXTREMELY EFFICIENT RAINFALL PRODUCTION BY ANY STORMS. A BIGGER CONCERN IS THE STRONG PRESSURE FALLS MOVING INTO THE NORTHERN CWFA. SUCH STRONG FALLS AT THIS POINT IN THE DAY POINTS TO SIGNIFICANT CONVECTION DEVELOPING SOON. AS A RESULT...POPS HAVE BEEN INCREASED FOR TONIGHT BUT COULD BE TOO LOW DEPENDING UPON WHERE EVERYTHING FIRES. ADDITIONALLY...HEAVY RAIN IS A VERY REAL THREAT WITH THE POTENTIAL FOR FLASH FLOODING. CONSIDERED ISSUING A FLASH FLOOD WATCH BUT NOT KNOWING EXACTLY HOW CONVECTION WILL DEVELOP THIS EVENING...HAVE OPTED TO JUST MENTION HEAVY RAIN WITH STORMS. MOST OF THE CONVECTION SHOULD PUSH EAST OF THE AREA PRIOR TO SUNRISE. HOWEVER...PLENTY OF LOW LEVEL MOISTURE SHOULD RESULT IN LOW CLOUDS DEVELOPING WITH DZ POSSIBLE. HAVE GONE WITH SCHC POPS OVER ROUGHLY THE EASTERN HALF SATURDAY MORNING WITH DZ IN THE WEST. SOME CLEARING SHOULD OCCUR DURING THE AFTERNOON WITH POSSIBLY SOME LINGERING CONVECTION IN THE FAR EAST. ...08... .LONG TERM...FRIDAY NIGHT THROUGH NEXT FRIDAY... ...SEASONALLY WARM AND HUMID WITH ROUNDS OF STORMS MONDAY NIGHT THROUGH TUESDAY NIGHT... OVERVIEW...INITIALIZATION AND ANALYSIS GOOD WITH UKMET AND HI-RES ECMWF BEST ON INITIALIZATION. USED THIS BLEND WITH SOME KINEMATIC INPUTS FROM 80KM NAM-WRF INTO SUNDAY. THEN...BASED ON RUN TO RUN CONTINUITY A BLEND OF UKMET/HI-RES ECMWF AND GFS AS ALL SHOW A SIGNIFICANT CONVECTIVE EVENT/S/ WITH NEXT FRONT EARLY NEXT WEEK. MAGNITUDE OF COOLING AFTER COOL FRONT PASSES A LINGERING QUESTION. SATURDAY NIGHT...LOCAL TECHNIQUES INDICATE AREAS OF FOG TO DEVELOP BETWEEN 1 AND 4 AM WITH LOCALLY DENSE RISKS OVER NW 1/4. ADDED AREAS OF FOG TO FORECAST AS WINDS TO DECOUPLE AND CLEAR SKIES AND SHALLOW INVERSION SUGGEST FOG MAY LAST UNTIL AT LEAST 8 AM AND POSSIBLY LOCALLY PAST 9 AM FOR LATER SHIFTS. LOWS WITH RADIATIONAL COOLING SHOULD BE 2 TO 3 PLUS DEGREES BELOW GUIDANCE MOST LOCATIONS. SUNDAY AND MONDAY...FAIR WEATHER...WARM AND HUMID WITH LIGHT WINDS AND HIGHS NEAR NORMAL AND LOWS ABOUT 3 TO 5 DEGREES ABOVE NORMAL. TUESDAY INTO WEDNESDAY...FAVORABLE SETUP FOR ONE OR MORE ROUNDS OF STRONG CONVECTION WITH LOCALLY HEAVY RAINS WITH PW/S AOA 1.5" TO NEAR 2 INCHES. ENOUGH INSTABILITY AND FORCING SUGGESTED FOR A DECENT CONVECTIVE SEVERE WEATHER EVENT FOR LATER SHIFTS TO REASSESS. INITIAL TOOLS AND TECHNIQUES SUGGEST SOME HAIL WITH AREAS OF 60 TO 70+ MPH WINDS IN LATE PM AND EVENING HOURS IN BOWING SEGMENTS. LOCAL HEAVY RAIN TOOLS SUGGEST 3 TO 6 INCH AMOUNTS POSSIBLE IN TRAINING STORMS FOR LATER SHIFTS TO CONSIDER. THURSDAY AND FRIDAY...CANADIAN HIGH PRESSURE TO FILTER IN WITH A WELCOME RETURN TO NEAR NORMAL TEMPERATURES...LOWER HUMIDITY AND QUIET. SYNOPTIC SCALE TRENDS SUGGEST LATER SHIFTS MAY NEED TO LOWER TEMPS AND ALSO DEWPOINTS WITH POTENTIALLY A NICE SPELL OF LATE SUMMER WEATHER. ..NICHOLS.. && .AVIATION... 18Z TAFS HAVE VCTS UNTIL 02Z-04Z. STRONG PRESSURE FALLS SHOULD RE-INITIATE CONVECTION THIS EVENING IN THE KCID/KDBQ/KMLI TRIANGLE THAT MAY BECOME QUITE STRONG WITH VSBYS/CIGS AOB 1SM AND 1KFT. THIS WAS NOT INCLUDED IN THOSE TAFS DUE TO UNCERTAINTY. ANOTHER MCS TO FIRE IN NORTHERN MISSOURI SHOULD AFFECT KBRL THIS EVENING. POTENTIAL THERE FOR 1-2SM AND CIGS AOB 2KFT. MOST CONVECTION SHOULD END BY 06Z/31. LOW LEVEL MOISTURE POINTS TO THE DEVELOPMENT OF LOW CLOUDS WITH CIGS EVENTUALLY DROPPING BLO 1KFT WITH VSBYS OF 3-5SM. ..08.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && 08/NICHOLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 456 AM CDT FRI JUL 30 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-311000- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON- CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON- HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL- WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON- WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- 456 AM CDT FRI JUL 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT RAIN WITH ISOLATED THUNDERSTORMS ARE EXPECTED TODAY AND THIS EVENING. AT THIS TIME...SEVERE WEATHER IS NOT EXPECTED WITH THESE STORMS. WIND GUSTS TO 50 MPH AND VERY SMALL HAIL IS POSSIBLE ALONG WITH LOCALLY HEAVY RAINFALL. AREA RIVERS ARE EXPERIENCING FLOODING. PLEASE SEE THE LATEST FLOOD STATEMENTS AND FLOOD WARNINGS FOR DETAILS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS MONDAY THROUGH TUESDAY... AND AGAIN TOWARD THE END OF THE WEEK. IT IS TOO SOON TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. LE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 820 PM CDT FRI JUL 30 2010 IAZ064-067-077-078-310245- JOHNSON IA-MUSCATINE IA-WASHINGTON IA-LOUISA IA- 820 PM CDT FRI JUL 30 2010 ...THUNDERSTORMS WITH VERY HEAVY RAIN... A CLUSTER OF THUNDERSTORMS WITH VERY HEAVY RAIN WILL MOVE SLOWLY EAST SOUTHEAST AFFECTING LOCATIONS FROM JUST EAST OF SHARON CENTER TO HILLS... RIVERSIDE... RIVER JUNCTION... LONE TREE AND NICHOLS THROUGH 930 PM. RAINFALL OF UP TO AN INCH AN HOUR WITH LOCALLY HIGHER AMOUNTS NEAR 1.5 INCHES CAN BE EXPECTED... WHICH WILL RESULT IN PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS...AND RISES IN AREA STREAMS AND CREEKS. && LAT...LON 4153 9114 4134 9114 4146 9165 4161 9165
The Quad Cities radar (KDVN), 72 km away, was scanning. The volume nearest the first event began at 03:12 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains resulted in flash flooding of Dougherty Drive in Lone Tree, IA during the late evening of July 30 and early morning of July 31.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2010Every state in 2010This day in weather historyWarnings in Iowa, July 2010
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: 248568.