Thunderstorm Wind, Hancock
- When
- July 11, 3:40 PM CST
- Where
- Hancock County, Nauvoo
- Measured
- 56 kt (64 mph) estimated gust
- Reported by
- Emergency Manager
- Coordinates
- 40.550, -91.380
Isolated trees were down in town and also 4 to 5 miles south of town.
Flash Flooding and Damaging Winds in Illinois, July 11, 2015
A weak warm front sparked afternoon and evening thunderstorms with locally heavy rains and an isolated flash flooding event in west central and northwestern Illinois along with isolated damaging winds.
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
- None recorded
- Events
- 5
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 DVN wrote it up.
A weak warm front sparked afternoon and evening thunderstorms with locally heavy rains and an isolated flash flooding event in west central and northwestern Illinois along with isolated damaging winds.
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 Quad Cities, IA wrote its last area forecast discussion before the first event at Jul 11, 2:21 PM CST, 1 hour 19 minutes earlier.
Area forecast discussion, Jul 11, 2:21 PM CST, 1 hour 19 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
321 PM CDT SAT JUL 11 2015
.SYNOPSIS...
ISSUED AT 308 PM CDT SAT JUL 11 2015
THE HEAVY RAIN PRODUCING MCS HAS NOW SHIFTING EAST OF THE CWA...WITH
A TAILING MCV LOCATED NEAR THE QUAD CITIES...WHICH IS ALSO PRODUCING
HEAVY RAIN THROUGH WARM RAIN PROCESSES OVER SCOTT COUNTY IOWA. THE
CWA REMAINS MOSTLY CLOUDY AND COOL...WITH UPPER 60S TO LOWER 80S
FOUND OVER THE AREA. A OUTFLOW BOUNDARY ENHANCED FRONT IS FOUND OVER
NORTHERN MISSOURI INTO FAR SOUTHERN IOWA. WITH CONVERGENCE STRONG
ALONG THIS BOUNDARY....WE ARE WATCHING FOR ADDITIONAL STRONG
CONVECTIVE CELLS TO DEVELOP AND TRAIN ALONG IT THIS AFTERNOON. FOR
THIS THREAT ON TOP OF EXCEPTIONALLY WET/SATURATED SOIL...A FLASH
FLOOD WATCH HAS ALREADY BEEN ISSUED.
&&
.SHORT TERM...(THIS EVENING THROUGH SUNDAY)
ISSUED AT 308 PM CDT SAT JUL 11 2015
THE COMMON THEME OF HEAT ADVISORIES BORDERING FLASH FLOOD WATCHES IS
AGAIN BEARING OUT TODAY. THE MCS THAT BROUGHT AN INITIAL ROUND OF
FLASH FLOODING HAS MOVED EAST...BUT THE CLOUDS BEHIND IT AND
NORTHEAST WINDS HAVE ARE LIKELY TO ASSIST CONVERGENCE FOR NEW ROBUST
STORMS...ESPECIALLY OVER THE SOUTHERN 1/2 OF THE CWA THIS AFTERNOON
AND THIS EVENING. LLJ WITH 2000 TO 4000 J/KG MUCAPE WILL CRASH INTO
THIS ENHANCED BOUNDARY THIS EVENING...AND DESPITE A SYNOPTIC TRIGGER
OF SIGNIFICANCE...IT IS LIKELY TO RESULT IN A CLUSTER OF STRONG
HEAVY RAIN PRODUCING STORMS. FLASH FLOOD GUIDANCE VALUES EARLIER
TODAY...BEFORE THE SIGNIFICANT RAINS OF 1 TO 4 INCHES...WERE ON THE
ORDER OF 1.5 TO 2 INCHES...AND NEW STORMS WILL LIKELY PRODUCE VALUES
OF THAT EASILY. NEVER MIND THE FACT THAT RAIN SINCE THAT GUIDANCE
CAME OUT HAVE RELATIVELY LOWERED THOSE VALUES. WHILE IT WILL BE
HARD TO CONFIDENTLY NAIL DOWN THE AREA...THE SOUTH 1/2 IS MOST AT
RISK SINCE CONVERGENCE IS HIGHEST THERE. IF CAPPING CAN HOLD...AND
IT LIKELY WILL NOT...A MORE NORTHERLY POSITION OF ELEVATED STORMS IS
POSSIBLE....AND HAVE KEPT SOME SLIGHT CHANCE POPS IN MY NORTH FOR
THAT POTENTIAL.
SUNDAY...THE HEAT IS ON. A HEADLINE WORTHY HEAT EVENT IS CERTAINLY
POSSIBLE WITH HEAT INDEX READINGS OF 95 TO 105 FORECAST BY OUR
OFFICE MODEL BLEND. THAT WILL BE HANDLED AFTER THE SHORTER TERM
THREAT OF FLASH FLOODING HAS SUBSIDED. I MAINTAINED A LOW THREAT FOR
STORMS EARLY IN THE DAY...BUT IT APPEARS SUNDAY WILL BE DRY...AND
HOT.
ERVIN
.LONG TERM...(SUNDAY NIGHT THROUGH SATURDAY)
ISSUED AT 308 PM CDT SAT JUL 11 2015
SUNDAY EVENING AND NIGHT...GREATEST CONCERN DURING THIS PERIOD IS
FOR SEVERE THUNDERSTORMS IN THE FORM OF AN MCS OR DERECHO MOVING
FROM NW TO SE ACROSS THE FORECAST AREA LATE SUNDAY NIGHT. THE
MAIN THREATS WILL BE DAMAGING WINDS AND LOCALIZED FLASH FLOODING.
SPC HAS A SLIGHT RISK FOR SEVERE STORMS OVER THE ENTIRE DVN CWA
WITH THE EXCEPTION OF THE FAR SOUTHWEST....OR SOUTH AND WEST OF A
KEOSAUQUA-TO-KEOKUK LINE. ALTHOUGH AN ENHANCED RISK DOES JUST
TOUCHE NORTHERN SECTIONS OF BUCHANAN...DELAWARE...AND DUBUQUE
COUNTIES AND FURTHER EXPANSION OF THIS ZONE IS STILL POSSIBLE.
HAVE 60-70 POPS OVER NORTHEAST TWO-THIRDS OF THE FORECAST AREA
OVERNIGHT WHEN SOUTHWESTERLY NOCTURNAL LOW-LEVEL JET IS FORECAST TO
INCREASE AND HELP DRIVE STORM DEVELOPMENT TO THE ESE FROM SOUTHERN
MINNESOTA/FAR NORTHERN IOWA/WESTERN WISCONSIN.
EVEN THOUGH IT WILL BE OVERNIGHT...THE ATMOSPHERE WILL LIKELY BE
PRIMED TO PROMOTE SEVERE THUNDERSTORM GROWTH AND MAINTENANCE.
THERE ARE SEVERAL NOTEWORTHY PARAMETERS INCLUDING...MUCAPE OF 3000
J/KG OR HIGHER...DCAPE OF 1000 TO 1500 J/KG...0-6 KM BULK SHEAR
OF 40-45 KTS...ALL OF WHICH POINT AT UPSCALE CONVECTIVE GROWTH AND
COLD POOL MAINTENANCE. ALSO...FORWARD PROPAGATING CORFIDI VECTORS
PUSH THE CONVECTION SOUTHEASTWARD TOWARD THE DVN CWA.
MONDAY...MID-LEVEL FLOW WILL GRADUALLY VEER FROM WESTERLY TO
NORTHWESTERLY BY MON NIGHT. HOWEVER...HOT TEMPERATURES ARE
FORECAST DURING THE DAY IN ADVANCE OF A SHORTWAVE TROUGH
APPROACHING FROM THE NW. FORECAST SOUNDINGS HAVE BL MIXING UP TO
AROUND 850MB WHERE TEMPS WILL BE VERY WARM...IN THE MID 20S C.
FORECAST HIGHS FROM THE UPPER 80S TO MID 90S COMBINED WITH SFC
DEWPOINTS IN THE LOWER TO UPPER 70S WOULD YIELD HEAT INDEX VALUES
BETWEEN 100 TO 110 F...WHICH WOULD BE THE HIGHEST VALUES OF THE
SEASON THUS FAR. HEAT ADVISORIES OR WARNINGS MAY BE NECESSARY FOR
PARTS OF THE AREA...POSSIBLY ON TUE AS WELL.
BY THE AFTN/EVENING...ANOTHER ROUND OF SEVERE STORMS IS
POSSIBLE...LOW-LEVEL CONVERGENCE FOCUSED ON REMNANT OUTFLOW
BOUNDARIES COULD SET OFF SCATTERED STORM DEVELOPMENT IN AN
ENVIRONMENT THAT IS CHARACTERIZED BY EXTREME CONDITIONAL
INSTABILITY...POSSIBLY IN EXCESS OF 4000 TO 5000 J/KG OF MUCAPE
WITH SUFFICIENT 0-6KM BULK SHEAR OF 40 KTS OR GREATER. IN FACT
SPC HAS MUCH OF THE FORECAST AREA EITHER UNDER A SLIGHT RISK OR AN
ENHANCED RISK FOR SEVERE STORMS. WHAT WILL BE DIFFERENT ON MONDAY
COMPARED TO SUNDAY NIGHT IS THAT THE STORMS ARE MORE LIKELY TO
INITIATE IN OUR AREA...MEANING THE RISK FOR SUPERCELLS AND WHAT
COMES WITH THEM...LARGE HAIL AND POSSIBLY ISOLATED TORNADOES...IS
HIGHER ON MONDAY.
TUESDAY THROUGH THURSDAY...SFC TEMPS ARE FORECAST TO TREND DOWN
THROUGH THIS PERIOD ALTHOUGH HIGHS IN THE MID 80S TO LOWER 90S ARE
STILL LIKELY ON TUESDAY. SOME MUCH NEEDED RELIEF IN THE FORM OF
LOWER TO MIDDLE 80S IS FORECAST FOR WED AND THU...ALONG WITH
SLIGHTLY LOWER DEWPOINTS.
PRECIP IS A DIFFERENT STORY SINCE QUASI-STATIONARY BOUNDARY WILL
PROBABLY NEVER COMPLETELY EXIT OUT OF THE DVN CWA. THE LOWEST
CHANCES FOR SHOWERS AND STORMS IS ON WED WITH 20 POPS IN THE
FORECAST. A NEW SHORTWAVE EMERGING FROM THE PLAINS ON THU IS THE
CAUSE FOR THE INCREASE IN POPS TO 30-40 PERCENT.
FRIDAY...SOUTHWESTERLY RETURN FLOW LOOKS TO BRING THE VERY WARM TO
HOT AND MUGGY AIR BACK INTO EASTERN IOWA/WESTERN ILLINOIS WITH TEMPS
IN THE MID 80S TO NEAR 90 F. ONLY HAVE SLIGHT CHANCES FOR SHOWERS
AND STORMS AT THE MOMENT.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SUNDAY AFTERNOON)
ISSUED AT 1218 PM CDT SAT JUL 11 2015
THUNDERSTORMS WILL BE POSSIBLE THROUGHOUT THE FORECAST PERIOD AS
AS WARM FRONT HANGS UP OVER EASTERN IOWA. WIDESPREAD RAIN AND
THUNDERSTORMS...WITH IFR TO MVFR CIGS AND VISIBILITIES WILL EXIT
THE REGION EARLY THIS AFTERNOON. THIS WILL IMPROVE MOST SITES TO
VFR FOR THE REST OF THE AFTERNOON AND EVENING...BUT WITH THE SET
UP FAVORING STORMS...ALL FLIGHTS WILL NEED TO CLOSELY MONITOR
RADAR TRENDS...AND TAF UPDATES. ANOTHER WIDESPREAD ROUND OF STORMS
APPEARS LIKELY OVERNIGHT...WITH HEAVY RAIN AND LOWER CIGS.
ERVIN
&&
.DVN WATCHES/WARNINGS/ADVISORIES...
IA...FLASH FLOOD WATCH UNTIL 1 AM CDT SUNDAY FOR CEDAR-DES MOINES-
HENRY IA-IOWA-JEFFERSON-JOHNSON-KEOKUK-LEE-LOUISA-MUSCATINE-
SCOTT-VAN BUREN-WASHINGTON.
IL...FLASH FLOOD WATCH UNTIL 1 AM CDT SUNDAY FOR HANCOCK-HENDERSON-
HENRY IL-MCDONOUGH-MERCER-ROCK ISLAND-WARREN.
MO...FLASH FLOOD WATCH UNTIL 1 AM CDT SUNDAY FOR CLARK-SCOTLAND.
&&
SYNOPSIS...ERVIN
SHORT TERM...ERVIN
LONG TERM...UTTECH
AVIATION...ERVINHazardous weather outlook, Jul 11, 3:40 AM CST, 12 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 440 AM CDT SAT JUL 11 2015 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-120945- 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- 440 AM CDT SAT JUL 11 2015 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 ARE POSSIBLE TODAY AND TONIGHT ACROSS THE AREA. THERE IS A LOW RISK OF SEVERE STORMS THIS AFTERNOON AND EVENING. IF SEVERE STORMS WOULD DEVELOP...THE PRIMARY THREAT WOULD BE DAMAGING WINDS. A BIGGER CONCERN FOR TONIGHT IS THE POTENTIAL FOR HEAVY RAINFALL. ALTHOUGH NOT CERTAIN...THE POSSIBILITY DOES EXIST FOR STORMS TO DEVELOP AND MOVE OVER THE SAME AREAS. IF THIS SCENARIO OCCURS... RAINFALL AMOUNTS COULD BE EXCESSIVE AND POTENTIALLY RESULT IN FLASH FLOODING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY WEAKENING THUNDERSTORMS EARLY SUNDAY COULD REIGNITE SUNDAY EVENING PROVIDING A LOCALIZED THREAT OF LARGE HAIL...DAMAGING WINDS AND HEAVY RAIN. A MORE SIGNIFICANT THREAT IS POSSIBLE DURING THE OVERNIGHT HOURS INTO MONDAY WHEN STORMS NORTHWEST OF THE AREA COULD COALESCE INTO A LINE CAPABLE OF PRODUCING DAMAGING WINDS AND HEAVY RAIN. THESE STORMS WILL CONTINUE EARLY MONDAY...THEN A SIMILAR PATTERN IS POSSIBLE WITH SEVERE STORMS REIGNITING MONDAY AFTERNOON OR EVENING. ALL OF THIS ACTIVITY WILL OCCUR IN PROXIMITY TO A WARM FRONT... THUS THE ULTIMATE LOCATION OF THAT BOUNDARY WILL INDICATE THE AREA OF HIGHEST RISK. AT THIS POINT THAT AREA APPEARS TO BE GENERALLY NORTHEAST OF A LINE FROM WATERLOO TO BURLINGTON IOWA. IN ADDITION TO THE THUNDERSTORMS...HEAT INDEX VALUES MAINLY SOUTH AND WEST OF THE QUAD CITIES ON SUNDAY AND MONDAY AFTERNOONS COULD REACH OR EXCEED 100 DEGREES. THIS WOULD BE THE FIRST EXTREME HEAT EPISODE OF THE SEASON...SO IMPACTS DUE TO HEAT STRESS TO PEOPLE WORKING OR RECREATING OUTDOORS COULD BE SIGNIFICANT IF CAUTION IS NOT EXERCISED. WHILE THUNDERSTORMS CANNOT BE RULED OUT TUESDAY AND WEDNESDAY...A MORE SIGNIFICANT THREAT OF THUNDERSTORMS IS FORECAST THURSDAY WITH BOTH LOCALLY HEAVY RAIN AND SEVERE WEATHER POSSIBLE. AT THIS POINT IT IS TOO EARLY TO PIN DOWN ANY DETAILS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. RAINFALL REPORTS OVER AN INCH WILL BE APPRECIATED. 08/WOLF
In the hours before
Local storm report, Jul 11, 2:07 PM CST, 1 hour 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
307 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0305 PM HEAVY RAIN MONTROSE 40.53N 91.42W
07/11/2015 M1.63 INCH LEE IA EMERGENCY MNGR
RAINFALL FROM LAST NIGHT THROUGH NOON TODAY.
&&
HAASELocal storm report, Jul 11, 2:15 PM CST, 1 hour 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
315 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0315 PM HEAVY RAIN 1 W BETTENDORF 41.56N 90.49W
07/11/2015 M1.08 INCH SCOTT IA TRAINED SPOTTER
TOTAL SINCE 715 AM.
&&Local storm report, Jul 11, 2:38 PM CST, 1 hour 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
338 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0315 PM HEAVY RAIN 3 SSE MEDIAPOLIS 40.97N 91.15W
07/11/2015 E2.62 INCH DES MOINES IA TRAINED SPOTTER
5 HOUR RAINFALL TOTAL BETWEEN 2.50 AND 2.74 INCHES.
&&Local storm report, Jul 11, 3:19 PM CST, 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
419 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0100 PM HEAVY RAIN 1 NE FORT MADISON 40.64N 91.33W
07/11/2015 M1.70 INCH LEE IA TRAINED SPOTTER
RAINFALL THIS MORNING INTO THE EARLY AFTERNOON.
&&
UTTECHLocal storm report, Jul 11, 3:32 PM CST, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
432 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM HEAVY RAIN BURLINGTON REGIONAL AIR 40.78N 91.13W
07/11/2015 M2.47 INCH DES MOINES IA ASOS
DAILY RAINFALL TOTAL. RAIN ALL FELL IN 8 HOURS BETWEEN 5
AM AND 1 PM.
0400 PM HEAVY RAIN DAVENPORT MUNICIPAL AIR 41.62N 90.58W
07/11/2015 M1.69 INCH SCOTT IA ASOS
DAILY RAINFALL TOTAL. RAIN ALL FELL IN 9 HOURS BETWEEN 7
AM AND 4 PM.
&&Local storm report, Jul 11, 3:40 PM CST, 0 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
440 PM CDT SAT JUL 11 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM HEAVY RAIN DAVENPORT MUNICIPAL AIR 41.62N 90.58W
07/11/2015 M1.69 INCH SCOTT IA ASOS
DAILY RAINFALL TOTAL. RAIN ALL FELL IN 9 HOURS BETWEEN 7
AM AND 4 PM.
0400 PM HEAVY RAIN BURLINGTON REGIONAL AIR 40.78N 91.13W
07/11/2015 M2.47 INCH DES MOINES IA ASOS
DAILY RAINFALL TOTAL. RAIN ALL FELL IN 8 HOURS BETWEEN 5
AM AND 1 PM.
0315 PM HEAVY RAIN 3 SSE MEDIAPOLIS 40.97N 91.15W
07/11/2015 E2.62 INCH DES MOINES IA TRAINED SPOTTER
5 HOUR RAINFALL TOTAL BETWEEN 2.50 AND 2.74 INCHES.
0315 PM HEAVY RAIN 1 W BETTENDORF 41.56N 90.49W
07/11/2015 M1.08 INCH SCOTT IA TRAINED SPOTTER
TOTAL SINCE 715 AM.
0305 PM HEAVY RAIN MONTROSE 40.53N 91.42W
07/11/2015 M1.63 INCH LEE IA EMERGENCY MNGR
RAINFALL FROM LAST NIGHT THROUGH NOON TODAY.
0230 PM HEAVY RAIN 2 W COPPOCK 41.16N 91.76W
07/11/2015 M1.50 INCH JEFFERSON IA TRAINED SPOTTER
1.5 INCHES MEASURED STORM TOTAL FOR JULY 11 MORNING
EVENT.
0220 PM HEAVY RAIN SE MOUNT UNION 41.06N 91.39W
07/11/2015 U0.00 INCH HENRY IA TRAINED SPOTTER
SPOTTER REPORTS UNOFFICIAL RAINFALL TOTAL OF 5.25 INCHES
WITH A SMALL TUBE GAGE. ANKLE DEEP FLOODING IN BACK
YARDS. DITCHES FULL. EARLIER ABOUT 3 INCHES OF WATER WAS
COVERING STREETS IN TOWN. THERE WAS HEAVY RAIN NONSTOP
FOR ABOUT AN HOUR. WATER POURING OUT OF FIELDS.
0100 PM HEAVY RAIN 1 NE FORT MADISON 40.64N 91.33W
07/11/2015 M1.70 INCH LEE IA TRAINED SPOTTER
RAINFALL THIS MORNING INTO THE EARLY AFTERNOON.
1245 PM HEAVY RAIN 6 WNW BURLINGTON 40.85N 91.22W
07/11/2015 M3.50 INCH DES MOINES IA TRAINED SPOTTER
7 HOUR TOTAL. 3.5 INCHES 545 AM TO 1245 PM.
1230 PM HEAVY RAIN 2 SW NEW LONDON 40.91N 91.43W
07/11/2015 M2.74 INCH HENRY IA COCORAHS
TOTAL SINCE 547 AM. FROM 547 AM UNTIL 700 AM 0.72 INCHES
OF RAIN FELL. FROM 7 AM UNTIL 1230 PM 2.02 INCHES FELL.
1228 PM HEAVY RAIN 1 ESE NEW LONDON 40.92N 91.39W
07/11/2015 M2.61 INCH HENRY IA COCORAHS
RAINFALL WITH MORNING STORMS...IN THE PAST 9 HOURS.
1155 AM FLASH FLOOD BURLINGTON 40.81N 91.12W
07/11/2015 DES MOINES IA TRAINED SPOTTER
WATER OVER NUMEROUS ROADS OVER 6 INCHES DEEP...SOME
FLOWING IN LOCATIONS. AT LEAST ONE VEHICLE STALLED IN
FLOOD WATER IN THE MIDDLE OF ROAD.
1148 AM FLASH FLOOD MOUNT PLEASANT 40.96N 91.55W
07/11/2015 HENRY IA LAW ENFORCEMENT
SEVERAL LOCATIONS IN TOWN WHERE ROADS ARE BEING
BARRICADED AND CLOSED DUE TO DEEP WATER OVER THEM
&&The radar
The Quad Cities radar (KDVN), 136 km away, was scanning. The volume nearest the first event began at 21:42 UTC.
Event by event
3 flash flood, 2 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Hancock
- When
- July 11, 4:18 PM CST
- Where
- Hancock County, 0.87 mi SE of Bentley
- Measured
- 61 kt (70 mph) estimated gust
- Reported by
- COOP Observer
- Coordinates
- 40.340, -91.110
Winds were estimated to gust up to 60 to 70 MPH. This was a delayed report and the time was estimated from local radar data.
Flash Flood, Hancock
- When
- July 11, 5:00 PM CST to 6:30 PM CST
- Where
- Hancock County, 1.75 mi SSE of Nauvoo to 3.14 mi SSE of Nauvoo
- Cause
- Heavy Rain
- Reported by
- Law Enforcement
- Coordinates
- 40.526, -91.369
Highway 96 was closed for localized flash flooding.
Flash Flood, McDonough
- When
- July 11, 6:45 PM CST to 8:15 PM CST
- Where
- McDonough County, 1.8 mi WSW of Colmar to 1.32 mi S of Colmar
- Cause
- Heavy Rain
- Reported by
- Trained Spotter
- Coordinates
- 40.339, -90.931
A few roads between Plymouth and Industry were flooded 6 to 12 inches deep in several places. Time was estimated based on radar and local reports.
Flash Flood, Hancock
- When
- July 11, 7:25 PM CST to 8:30 PM CST
- Where
- Hancock County, 0.56 mi NNW of West Pt to 1.74 mi SSW of Stillwell
- Cause
- Heavy Rain
- Reported by
- COOP Observer
- Coordinates
- 40.258, -91.184
Localized Flooding was reported between Stillwell and Augusta with water over some roads and local Law Enforcement slowing traffic down to one lane in places due to the water. A viaduct going into Augusta was flooded.
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Flash Flooding and Damaging Wind in Missouri, July 11 to 12, 2015
- Rip Current in Puerto Rico, July 11, 2015
- Coastal Flood in Guam, July 11 to 14, 2015
- Tornado and Flash Flooding in Illinois, July 11 to 12, 2015
- Flash Flood and Hail in New Mexico, July 11, 2015
- Hail and Damaging Winds in Florida, July 11, 2015
- Hail and Damaging Winds in North Dakota, July 11, 2015
- Tornado and Hail in North Dakota, July 11 to 12, 2015
- Flooding and Heavy Rain in Virginia, July 11, 2015
- Flash Flooding and Damaging Winds in Illinois, July 11 to 12, 2015
- Flooding and Heavy Rain in North Carolina, July 11, 2015
- Hail and Damaging Winds in Florida, July 11, 2015
More
Every storm in Illinois in 2015Every state in 2015This day in weather historyWarnings in Illinois, July 2015
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: 596882, 596885, 596891, 596894, 596895.