Heavy rains resulted in flash flooding in Colchester, IL during the late morning of July 19.
Every event with a place to put it. Tap one for its entry below.
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 Colchester, IL during the late morning of July 19.
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 19, 2:30 AM CST, 7 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 330 AM CDT MON JUL 19 2010 .SYNOPSIS... 06Z SFC ANALYSIS HAS A LOW OVER KP58 IN LOWER MICHIGAN WITH A FRONT RUNNING SOUTHWEST INTO NORTHERN MISSOURI BEFORE TURNING WEST AND BECOMING A BOUNDARY INTO SOUTHERN NEBRASKA. ANOTHER LOW WAS NEAR KHLC WITH A STATIONARY FRONT EAST SOUTHEAST INTO CENTRAL MISSOURI. WEAK MESO LOWS WERE IN SOUTH DAKOTA WITH THE ONE AROUND KPIR ASSOCIATED WITH A SMALL THUNDERSTORM COMPLEX. RADAR/SATELLITE TRENDS INDICATE WEAK CONVECTION IN WAA ACROSS NORTHERN IOWA WITH STRONGER CONVECTION ALONG THE MISSOURI RIVER IN THE BETTER LLJ. DEW POINTS WERE IN THE 70S SOUTH OF IOWA WITH 60S FROM NEBRASKA INTO WISCONSIN. && .SHORT TERM...TODAY AND TONIGHT THE NEXT 24 HRS WILL BE QUITE INTERESTING WITH VERY ACTIVE WX AND SVR STORMS A GOOD BET. NEWLY DEVELOPED MCS ALONG THE MISSOURI RIVER IS A NEW VARIABLE IN THE IMMEDIATE SHORT TERM. CORFIDI VECTORS SUGGEST AN ESE MOVEMENT FOR THE NEXT SEVERAL HRS THAT BECOME MORE EASTERLY AFTER 12Z. WEAK WAA SHRA/TSRA NEAR KALO CONTINUE TO MOVE ESE AS WELL. CURRENT POP GRIDS FOR THIS MORNING INDICATE ISOLD/SCT CONVECTION WHICH SHOULD HOLD FOR NOW. A BIGGER CONCERN IS CONVECTION AND ORGANIZED MCS ACTIVITY FOR THIS AFTERNOON. AN ORGANIZED MCS...LIKELY SVR...SHOULD BE MOVING ACROSS IOWA BY EARLY AFTERNOON AND MOVE THROUGH THE CWFA MID TO LATE AFTERNOON AND EVENING. SEVERAL PARAMETERS POINT TO A POSSIBLE DERECHO. THUS WILL INCREASE POPS AND ADD MENTION OF DAMAGING WINDS. THE QUESTION IS WHERE WILL THE DERECHO GO. CURRENT DAY 1 OUTLOOK POINTS TO THE CENTRAL/SOUTHERN CWFA WHICH MAKES SENSE AS THE SVR MCS WOULD TRACK ALONG THE GRADIENT OF INSTABILITY. HOWEVER...CURRENT CONVECTION IN SOUTH DAKOTA WOULD SUGGEST POSSIBLY THE CENTRAL/NORTHERN CWFA DEPENDING UPON WHICH MCS IS THE INITIATION SEED FOR THE SVR MCS. A SVR MCS SHOULD BE OVER THE CWFA BY LATE AFTERNOON/EARLY EVENING SO WILL CONTINUE WITH THE MENTION OF DAMAGING WINDS INTO THE EVENING. MODELS SHOW STRONG WAA OCCURRING THE PLAINS THIS EVENING WHICH MAY RESULT IN ANOTHER MCS MOVING INTO THE AREA LATE TONIGHT. ...08... .LONG TERM...TUESDAY THROUGH SUNDAY ESSENTIALLY NO CHANGE IN THE LONG WAVE PATTERN THROUGH THE WEEK WITH NEAR-ZONAL FLOW SPANNING THE NORTHERN U.S. PRECISE MODEL TIMING OF SHORT WAVES EMBEDDED IN THIS FLOW IS NOT TRUSTWORTHY...PARTICULARLY THE WEAKER WAVES. THROUGH MUCH OF THE WORK WEEK...PARALLEL SURFACE BOUNDARY WILL MEANDER IN THE I-70 TO I-80 CORRIDOR...OCCASIONALLY LIFTING NORTH WHEN PUSHED BY SOUTHERLY RETURN FLOW...AND ALTERNATIVELY REINFORCED AND SHIFTED BY STORM OUTFLOWS. POSITION OF THE BOUNDARY FROM DAY TO DAY WILL BE KEY IN PINPOINTING LOCATION OF GREATEST POTENTIAL FOR MCS AND SEVERE WEATHER DEVELOPMENT. MODELS CONSISTENTLY CONTINUE TO DEPICT...AND THUS CONFIDENCE IS REASONABLY HIGH...THAT BOUNDARY WILL BE IN OR VERY NEAR THE CWFA THROUGH FRIDAY. SO FOR NOW HAVE CONTINUED THE BROAD BRUSH APPROACH TO POPS THROUGH THE WEEK WITH THE DETAILS AND FINE-TUNING LEFT TO THE SHORTER TERM FORECAST EACH DAY. DEW POINTS IN THE 70S PLUS PRECIPITABLE WATERS IN THE 125 TO 200 PERCENT OF NORMAL RANGE THROUGH THE PERIOD SUGGEST HEAVY RAIN WILL BE SIGNIFICANT THREAT. OCCASIONAL MODEL-PROGGED 2000 TO 4000 J/KG CAPES ALSO SUPPORT POTENTIAL SEVERE WEATHER THREAT. AT THIS POINT...BEST POTENTIAL FOR A PRECIP-FREE DAY WILL BE THURSDAY AS THE WARM FRONT LIFTS NORTH AND MOST OR ALL OF THE CWFA ENDS UP IN THE WARM SECTOR. THIS MORNINGS MODEL RUNS ARE A BIT SLOWER THAN PREVIOUS RUNS AND HOLD ON TO THE WARM-FRONTAL PRECIP INTO THURSDAY..SO THIS BEARS WATCHING. STRONG CFP FRIDAY NIGHT WILL PAVE THE WAY FOR THE FIRST AIR MASS CHANGE WE/VE SEEN IN A WHILE AND A PRIMARILY DRY WEEKEND. && .AVIATION... CONVECTION IN WEAK WAA NEAR KALO WL CONT MOVG EAST SOUTHEAST. NEW CONVECTION IS DVLPG ACRS SOUTHERN IA IN STRONGER WAA. WL NOWCAST CONVECTION UP UNTIL 12Z TAF ISSUANCE WITH VCTS PLANNING. A SVR MCS SHOULD RACE ACROSS IA AND POSSIBLY AFFECT SEVERAL TAF SITES IN THE 19Z-01Z TIME FRAME. WL GO VCTS FOR THIS MCS AS TIMING WL LIKELY NOT BE KNOWN UNTIL THE 18Z TAFS. VFR WX TO BE SEEN OUTSIDE OF SHRA/TSRA. MORNING CONVECTION MAY RESULT IN 3-5SM AND 3KFT CIGS. AFTERNOON CONVECTION MAY BRIEFLY CAUSE BLO 1SM AND ARND 1KFT CIGS. ...08... && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && 08/33/08
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 844 AM CDT MON JUL 19 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-201000- BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO- CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL- HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA- JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA- MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL- SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL- WASHINGTON IA-WHITESIDE IL- 844 AM CDT MON JUL 19 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 THUNDERSTORMS WILL BE SEEN ACROSS THE AREA TODAY AND TONIGHT. THE STORM PREDICTION CENTER HAS A SLIGHT RISK OF SEVERE STORMS FOR THE ENTIRE AREA TODAY AND TONIGHT. THE MAIN THREAT IS DAMAGING WINDS. THE TIMING IS STILL SOMEWHAT UNCERTAIN. HOWEVER...THE MOST LIKELY TIME PERIOD WOULD BE THIS AFTERNOON AND EARLY EVENING. HEAVY RAIN WILL BE AN ADDITIONAL THREAT...WITH 1 TO 2 INCHES POSSIBLE OVER THE NEXT 24 HOURS. SOME AREA RIVERS ARE EXPERIENCING FLOODING. PLEASE SEE THE LATEST FLOOD STATEMENTS AND FLOOD WARNINGS FOR DETAILS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY THROUGH WEDNESDAY...SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED TO AFFECT THE OUTLOOK AREA. THERE IS A SLIGHT RISK THAT SOME OF THESE STORMS MAY REACH SEVERE LEVELS...MAINLY ALONG AND SOUTH OF INTERSTATE 80. THE PRIMARY THREAT WITH THESE STORMS WILL BE DAMAGING WINDS...HEAVY RAIN...AND POSSIBLY LARGE HAIL. IF STORMS TRACK ACROSS THE SAME AREAS...THEN THERE WILL AN INCREASED RISK OF FLASH FLOODING AND RIVER FLOODING. THE FOCUS FOR THUNDERSTORMS WILL SHIFT SLOWLY NORTH THURSDAY AND FRIDAY...BRINGING AN INCREASED THREAT OF THUNDERSTORMS TO THE REMAINDER OF THE OUTLOOK AREA. IT IS TOO EARLY TO DETERMINE IF ANY OF THESE STORMS WILL HAVE THE POTENTIAL TO REACH SEVERE LEVELS. HEAVY RAINS THROUGH THE PERIOD WILL LIKELY BRING SIGNIFICANT RISES OR POSSIBLE FLOODING TO AREA RIVERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND EVENING. ERVIN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 758 AM CDT MON JUL 19 2010 IAZ098-099-191400- LEE-VAN BUREN- 758 AM CDT MON JUL 19 2010 ...STRONG THUNDERSTORM WITH HAIL... AT 755 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR CANTRIL...OR 7 MILES SOUTHWEST OF KEOSAUQUA...MOVING EAST AT 20 MPH. * THE THUNDERSTORM WILL BE NEAR... KEOSAUQUA AROUND 810 AM CDT... BENTONSPORT/VERNON AROUND 825 AM CDT... BONAPARTE AROUND 835 AM CDT... DONNELLSON AND 7 MILES SOUTHWEST OF PILOT GROVE AROUND 900 AM CDT... PENNY TO NICKEL SIZE HAIL...WINDS GREATER THAN 35 MPH...HEAVY RAIN...IS EXPECTED WITH THIS STORM. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS. LAT...LON 4077 9153 4062 9153 4060 9216 4075 9215 TIME...MOT...LOC 1257Z 267DEG 19KT 4067 9204 08
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
853 AM CDT MON JUL 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0851 AM HEAVY RAIN 5 NW CROTON 40.64N 91.74W
07/19/2010 M1.25 INCH VAN BUREN IA TRAINED SPOTTER
RAINFALL T0TAL IN THE PAST 35 MINUTES. STILL RAINING.
SPOTTER ALSO REPORTS WATER RUNNING ACROSS THE ROAD.
&&
MIKEZSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
857 AM CDT MON JUL 19 2010
IAZ098-099-ILZ034-MOZ009-010-191500-
LEE IA-VAN BUREN IA-HANCOCK IL-CLARK MO-SCOTLAND MO-
857 AM CDT MON JUL 19 2010
...STRONG THUNDERSTORMS WITH HEAVY RAIN AND GUSTY WINDS...
THUNDERSTORMS WILL MOVE SLOWLY OVER AREAS SOUTH OF HIGHWAY 34
THROUGH 10 AM...WITH MINOR FLOODING POSSIBLE. 1 TO 2 INCHES OF RAIN
MAY FALL THIS MORNING...SATURATING THE GROUND AND RESULTING IN FULL
DITCHES AND STREAMS.
EXPECT PONDING OF WATER ON ROADS AND IN LOW-LYING AREAS...AND RISES
IN AREA STREAMS AND CREEKS.
&&
LAT...LON 4019 9145 4020 9151 4025 9151 4025 9195
4030 9196 4030 9235 4055 9237 4060 9234
4061 9220 4081 9218 4066 9117 4064 9121
4062 9093 4019 9093
ERVINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
900 AM CDT MON JUL 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 AM HEAVY RAIN 5 E CANTRIL 40.64N 91.98W
07/19/2010 M1.00 INCH VAN BUREN IA TRAINED SPOTTER
1 INCH IN PAST HOUR.
&&
DLSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
931 AM CDT MON JUL 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 AM HEAVY RAIN 5 NW CROTON 40.64N 91.74W
07/19/2010 M2.20 INCH VAN BUREN IA TRAINED SPOTTER
AMOUNT IN PAST HOUR.
&&
DLSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
948 AM CDT MON JUL 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0947 AM HEAVY RAIN NAUVOO 40.55N 91.38W
07/19/2010 M0.75 INCH HANCOCK IL TRAINED SPOTTER
RAINFALL TOTAL IN THE PAST 20 MINUTES. RAIN IS STILL
FALLING.
&&
MIKEZThe Lincoln radar (KILX), 129 km away, was scanning. The volume nearest the first event began at 15:56 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains of 1.50 inches in under an hour resulted in flash flooding of some streets in Colchester, IL during the late morning of July 19.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2010Every state in 2010This day in weather historyWarnings in Illinois, 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: 248507.