Alert archive / Iowa / Flash Flood Watches in 2012
Flash Flood Watch 2, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood watch at May 4, 2012, 3:31 PM CDT for 11 counties in Illinois; 18 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- May 4, 2012, 3:31 PM CDT (20:31 UTC)
- Expired
- May 5, 2012, 2:33 AM CDT
- In force
- 11 hr
- Issued by
- NWS Quad Cities, IA
- Flood severity
- None
All 31 counties
Benton County, IA, Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 52 km from the middle of the area, began a volume at 20:36 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 58 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 16 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted, in the capitals the NWS used until 2016.
929 WGUS63 KDVN 042031 FFADVN URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE QUAD CITIES IA IL 331 PM CDT FRI MAY 4 2012 ...HEAVY RAIN AGAIN A THREAT TONIGHT... .A WET PATTERN ACROSS THE AREA FOR THE PAST WEEK HAS LEFT SOILS ACROSS THE AREA QUITE MOIST. THE HEAVY RAINFALL LAST NIGHT HAS ESSENTIALLY SATURATED THE GROUND ALONG AND SOUTH OF INTERSTATE 80. A NEAR TROPICAL ATMOSPHERE REMAINS ACROSS THE AREA WITH ADDITIONAL THUNDERSTORMS EXPECTED TONIGHT. ANY ADDITIONAL HEAVY RAINFALL TONIGHT WILL RAPIDLY RUN OFF INTO AREA WATERWAYS AND LOW LYING AREAS. IAZ051>054-063>068-076>078-087>089-098-099-ILZ007-009-015>018- 024>026-034-035-MOZ009-010-050430- /O.NEW.KDVN.FF.A.0002.120504T2031Z-120505T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE- SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES- VAN BUREN-LEE-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU- PUTNAM-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- INCLUDING THE CITIES OF...VINTON...CEDAR RAPIDS...ANAMOSA... MAQUOKETA...MARENGO...IOWA CITY...TIPTON...CLINTON...MUSCATINE... BETTENDORF...DAVENPORT...SIGOURNEY...WASHINGTON...WAPELLO... FAIRFIELD...MOUNT PLEASANT...BURLINGTON...KEOSAUQUA.... FORT MADISON...MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE... ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO...OQUAWKA... MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA 331 PM CDT FRI MAY 4 2012 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY MORNING... THE NATIONAL WEATHER SERVICE IN QUAD CITIES HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF ILLINOIS...IOWA AND NORTHEAST MISSOURI...INCLUDING THE FOLLOWING AREAS...IN ILLINOIS...BUREAU...CARROLL...HANCOCK...HENDERSON...HENRY IL... MCDONOUGH...MERCER...PUTNAM...ROCK ISLAND...WARREN AND WHITESIDE. IN IOWA...BENTON...CEDAR...CLINTON...DES MOINES... HENRY IA...IOWA...JACKSON...JEFFERSON...JOHNSON...JONES... KEOKUK...LEE...LINN...LOUISA...MUSCATINE...SCOTT...VAN BUREN AND WASHINGTON. IN NORTHEAST MISSOURI...CLARK AND SCOTLAND. * THROUGH SATURDAY MORNING * RECENT RAINFALL HAS RESULTED IN SOILS BECOMING VERY MOIST ACROSS THE AREA. AREAS THAT RECEIVED HEAVY RAIN LAST NIGHT HAVE SATURATED GROUND. * RAINFALL TONIGHT COULD BE 1 TO 2 INCHES. * ANY ADDITIONAL HEAVY RAINFALL TONIGHT WILL QUICKLY RUN OFF INTO LOW LYING AREAS AND AREA WATERWAYS CAUSING FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE. MONITOR FORECASTS AND TAKE ACTION IF FLASH FLOOD WARNINGS ARE ISSUED OR FLASH FLOODING DEVELOPS. && $$
3 follow-up statements
917 WGUS63 KDVN 050054 FFADVN FLOOD WATCH NATIONAL WEATHER SERVICE QUAD CITIES IA IL 754 PM CDT FRI MAY 4 2012 ...HEAVY RAIN A THREAT AGAIN TONIGHT... .A WET PATTERN ACROSS THE AREA FOR THE PAST WEEK HAS LEFT SOILS ACROSS THE AREA QUITE MOIST. THE HEAVY RAINFALL LAST NIGHT HAS ESSENTIALLY SATURATED THE GROUND ALONG AND SOUTH OF INTERSTATE 80. A NEAR TROPICAL ATMOSPHERE REMAINS ACROSS THE AREA WITH ADDITIONAL THUNDERSTORMS EXPECTED TONIGHT. ANY ADDITIONAL HEAVY RAINFALL TONIGHT WILL RAPIDLY RUN OFF INTO AREA WATERWAYS AND LOW LYING AREAS. IAZ051>054-063>068-076>078-087>089-098-099-ILZ007-009-015>018- 024>026-034-035-MOZ009-010-050900- /O.CON.KDVN.FF.A.0002.000000T0000Z-120505T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE- SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES- VAN BUREN-LEE-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU- PUTNAM-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- INCLUDING THE CITIES OF...VINTON...CEDAR RAPIDS...ANAMOSA... MAQUOKETA...MARENGO...IOWA CITY...TIPTON...CLINTON...MUSCATINE... BETTENDORF...DAVENPORT...SIGOURNEY...WASHINGTON...WAPELLO... FAIRFIELD...MOUNT PLEASANT...BURLINGTON...KEOSAUQUA.... FORT MADISON...MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE... ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO...OQUAWKA... MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA 754 PM CDT FRI MAY 4 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SATURDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF ILLINOIS...IOWA AND NORTHEAST MISSOURI...INCLUDING THE FOLLOWING AREAS...IN ILLINOIS...BUREAU...CARROLL... HANCOCK...HENDERSON...HENRY IL...MCDONOUGH...MERCER...PUTNAM... ROCK ISLAND...WARREN AND WHITESIDE. IN IOWA...BENTON... CEDAR... CLINTON...DES MOINES...HENRY IA...IOWA...JACKSON... JEFFERSON... JOHNSON...JONES...KEOKUK...LEE...LINN...LOUISA... MUSCATINE... SCOTT...VAN BUREN AND WASHINGTON. IN NORTHEAST MISSOURI... CLARK AND SCOTLAND. * UNTIL 7 AM CDT SATURDAY * RECENT RAINFALL HAS RESULTED IN SOILS BECOMING VERY MOIST ACROSS THE AREA. AREAS THAT RECEIVED HEAVY RAIN LAST NIGHT HAVE SATURATED GROUND. * RAINFALL TONIGHT COULD BE 1 TO 2 INCHES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE. MONITOR FORECASTS AND TAKE ACTION IF FLASH FLOOD WARNINGS ARE ISSUED OR FLASH FLOODING DEVELOPS. && $$
582 WGUS63 KDVN 050230 FFADVN FLOOD WATCH NATIONAL WEATHER SERVICE QUAD CITIES IA IL 930 PM CDT FRI MAY 4 2012 ...HEAVY RAIN A THREAT AGAIN LATE TONIGHT... .A WET PATTERN ACROSS THE AREA FOR THE PAST WEEK HAS LEFT SOILS ACROSS THE AREA QUITE MOIST. THE HEAVY RAINFALL LAST NIGHT HAS ESSENTIALLY SATURATED THE GROUND ALONG AND SOUTH OF INTERSTATE 80. A NEAR TROPICAL ATMOSPHERE REMAINS ACROSS THE AREA WITH ADDITIONAL THUNDERSTORMS EXPECTED AFTER MIDNIGHT TONIGHT. ANY ADDITIONAL HEAVY RAINFALL TONIGHT WILL RAPIDLY RUN OFF INTO AREA WATERWAYS AND LOW LYING AREAS. IAZ051>054-063>068-076>078-087>089-098-099-ILZ007-009-015>018- 024>026-034-035-MOZ009-010-051030- /O.CON.KDVN.FF.A.0002.000000T0000Z-120505T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE- SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES- VAN BUREN-LEE-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU- PUTNAM-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- INCLUDING THE CITIES OF...VINTON...CEDAR RAPIDS...ANAMOSA... MAQUOKETA...MARENGO...IOWA CITY...TIPTON...CLINTON...MUSCATINE... BETTENDORF...DAVENPORT...SIGOURNEY...WASHINGTON...WAPELLO... FAIRFIELD...MOUNT PLEASANT...BURLINGTON...KEOSAUQUA.... FORT MADISON...MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE... ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO...OQUAWKA... MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA 930 PM CDT FRI MAY 4 2012 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SATURDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF ILLINOIS...IOWA AND NORTHEAST MISSOURI...INCLUDING THE FOLLOWING AREAS...IN ILLINOIS...BUREAU...CARROLL... HANCOCK...HENDERSON...HENRY IL...MCDONOUGH...MERCER...PUTNAM... ROCK ISLAND...WARREN AND WHITESIDE. IN IOWA...BENTON... CEDAR... CLINTON...DES MOINES...HENRY IA...IOWA...JACKSON... JEFFERSON... JOHNSON...JONES...KEOKUK...LEE...LINN...LOUISA... MUSCATINE... SCOTT...VAN BUREN AND WASHINGTON. IN NORTHEAST MISSOURI... CLARK AND SCOTLAND. * UNTIL 7 AM CDT SATURDAY * RECENT RAINFALL HAS RESULTED IN SOILS BECOMING VERY MOIST ACROSS THE AREA. AREAS THAT RECEIVED HEAVY RAIN LAST NIGHT HAVE SATURATED GROUND. * THUNDERSTORMS MOVING INTO THE AREA AFTER MIDNIGHT TONIGHT COULD PRODUCE RAINFALL OF 1 TO 2 INCHES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING IS POSSIBLE. MONITOR FORECASTS AND TAKE ACTION IF FLASH FLOOD WARNINGS ARE ISSUED OR FLASH FLOODING DEVELOPS. && $$
115 WGUS63 KDVN 050733 FFADVN FLOOD WATCH NATIONAL WEATHER SERVICE QUAD CITIES IA IL 233 AM CDT SAT MAY 5 2012 ...FLASH FLOOD WATCH CANCELLED... .EAST WINDS HAVE BROUGHT DRIER AND COOLER AIR INTO THE REGION GREATLY REDUCING THE CHANCES FOR THUNDERSTORMS. THEREFORE THE FLASH FLOOD WATCH HAS BEEN CANCELLED. IAZ051>054-063>068-076>078-087>089-098-099-ILZ007-009-015>018- 024>026-034-035-MOZ009-010-050845- /O.CAN.KDVN.FF.A.0002.000000T0000Z-120505T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-CEDAR-CLINTON-MUSCATINE- SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES- VAN BUREN-LEE-CARROLL-WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU- PUTNAM-MERCER-HENDERSON-WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- INCLUDING THE CITIES OF...VINTON...CEDAR RAPIDS...ANAMOSA... MAQUOKETA...MARENGO...IOWA CITY...TIPTON...CLINTON...MUSCATINE... BETTENDORF...DAVENPORT...SIGOURNEY...WASHINGTON...WAPELLO... FAIRFIELD...MOUNT PLEASANT...BURLINGTON...KEOSAUQUA.... FORT MADISON...MOUNT CARROLL...STERLING...ROCK FALLS...MOLINE... ROCK ISLAND...KEWANEE...PRINCETON...HENNEPIN...ALEDO...OQUAWKA... MONMOUTH...CARTHAGE...MACOMB...MEMPHIS...KAHOKA 233 AM CDT SAT MAY 5 2012 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF ILLINOIS...IOWA AND NORTHEAST MISSOURI HAS BEEN CANCELLED. $$ HAASE
What forecasters said that day
The local office's own words before this flash flood watch went out, 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 this flash flood watch went out at May 4, 3:28 PM CDT, 3 minutes earlier.
Area forecast discussion, May 4, 3:28 PM CDT, 3 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
328 PM CDT FRI MAY 4 2012
.SYNOPSIS...
12Z UA ANALYSIS HAS A WEAK 850MB BOUNDARY ALONG THE IA/MN BORDER
INTO SOUTHERN WISCONSIN. SOUTH OF THIS BOUNDARY 850MB DEW POINTS
WERE IN THE MID TEENS FROM NEBRASKA EAST INTO NORTHERN ILLINOIS.
NUMEROUS WEAK TROFS RAN FROM THE MID MISSISSIPPI VALLEY BACK INTO
THE SOUTHERN ROCKIES. SATELLITE TRENDS THROUGH MID AFTERNOON SHOWS
RAPID THINNING OF THE CS/CI SHIELD WITH CU DEVELOPING ALONG
BOUNDARIES. STRONG STORMS WERE IN SOUTHWEST MINNESOTA INTO
NORTHEAST NEBRASKA.
18Z SFC ANALYSIS HAS A BOUNDARY FROM NORTHWEST IOWA EAST SOUTHEAST
TO THE WI/IL BORDER WHERE IT INTERSECTS A LAKE COLD FRONT. ANOTHER
BOUNDARY RAN FROM CENTRAL NEBRASKA EAST SOUTHEAST INTO CENTRAL
ILLINOIS. DEW POINTS WERE GENERALLY IN THE 70S IN THE CENTRAL AND
SOUTHERN PLAINS WITH 60S OVER THE MID MISSISSIPPI VALLEY AND
SOUTHERN GREAT LAKES. DEW POINTS IN THE 40S AND 50S WERE OVER THE
UPPER MIDWEST AND MOST OF THE GREAT LAKES.
&&
.SHORT TERM...TONIGHT
THE QUESTION IS NOT IF CONVECTION WILL OCCUR BUT WHERE AND HOW
DOES IT EVOLVE.
UNLIKE YESTERDAY...TRENDS FROM THE RAP MODEL ARE INCONCLUSIVE.
CONCEPTUALLY AS THE ATMOSPHERE IN THE WAKE OF THE NOCTURNAL MCS
CONTINUES TO DESTABILIZE THE CURRENT CONVECTION IN NORTHEAST
NEBRASKA WOULD FAVOR MOVING ALONG ANY MOISTURE OR THETA E
GRADIENTS. SUCH A MOVEMENT...WITH SOME INPUT FROM THE RAP...WOULD
BE TO THE EAST SOUTHEAST THROUGH LATE AFTERNOON AND OVERNIGHT. THE
CONVECTION IN SOUTHWEST MINNESOTA WOULD WANT TO DO THE SAME AND
MAY PASS TO THE NORTH OF THE CWFA.
A SECONDARY QUESTION IS THE HEAVY RAIN POTENTIAL AND SUBSEQUENT
THREAT OF FLASH FLOODING. THERE ARE DIFFERENCES BETWEEN LAST
NIGHT AND TONIGHT. FIRST...THE LLJ IS CURRENTLY PROGGED TO BE NOT
AS STRONG AS LAST NIGHT WHICH COULD LIMIT MOISTURE TRANSPORT ONCE
STORMS EVOLVE INTO AN MCS. SECOND...THE BACKWARD PROPAGATING
CORFIDI VECTORS DO NOT GO PERPENDICULAR OR OPPOSE THE FORWARD
PROPAGATING VECTORS. THUS THE POTENTIAL FOR TRAINING MAY NOT
EXIST. THIRD...THE MAGNITUDE OF THE FORWARD PROPAGATING VECTORS DO
NOT DECREASE SUGGESTING STORM MOVEMENT WOULD SLOW DOWN.
HOWEVER...PWATS ARE STILL CLOSE TO 200 PERCENT OF NORMAL BASED ON
THE 12Z SOUNDINGS FROM DVN ON WEST TO OAX AND LBF. THUS ANY STORMS
THAT DO DEVELOP WILL BE VERY EFFICIENT AT PUTTING OUT HEAVY
RAINFALL. ADDITIONALLY...CURRENT FLASH FLOOD GUIDANCE IS AT OR
JUST BELOW AN INCH IN ONE HOUR FOR AREAS ALONG AND SOUTH OF I-80
AND GENERALLY 1 TO 1.5 INCHES IN 1 HOUR NORTH OF I-80 EXCEPT THE
HWY 20 CORRIDOR WHICH IS CLOSER TO 2 INCHES IN 1 HOUR.
GIVEN THE THREAT OF HEAVY RAIN IS VERY REAL AND FLASH FLOOD
GUIDANCE IS QUITE LOW MORE MUCH OF THE AREA...WILL ISSUE A FLASH
FLOOD WATCH FOR ALL BUT THE HWY 20 CORRIDOR FOR LATE THIS
AFTERNOON AND TONIGHT. ..08..
&&
.LONG TERM...SATURDAY THROUGH FRIDAY...
EARLY MORNING STORMS ARE POSSIBLE SATURDAY...BUT WITH A WEAKER LOW
LEVEL JET...THEY SEEM A LOWER LIKELIHOOD THAN TODAY. EITHER
WAY...CIRRUS AND MCS REMNANTS MAY TAKE MOST OF THE MORNING TO THIN
OR EXIT THE AREA BEFORE HEATING COMMENCES. HIGHS SHOULD STILL REACH
THE LOWER OT MID 70S NORTH TO 80 TO 85 SOUTH. THE VERY ACTIVE AND
WET PATTERN CONTINUES INTO EARLY MONDAY...WITH A LESSER APPARENT
CHANCE FOR MCS POTENTIAL SATURDAY NIGHT THAN IN PAST
NIGHTS...HOWEVER...IT IS THE SAME BOUNDARY WITH THE SAME HIGH PWAT
AIRMASS AND AVAILABLE CAPE...THUS WILL KEEP MODERATE CHANCE POPS
GOING SATURDAY NIGHT. ANY THUNDERSTORMS COMPLEX COULD OFFER HEAVY
RAINFALL.
THE EAST TO WEST SURFACE BOUNDARY WILL TURN TURN TOWARDS A
CONVERGENCE AXIS FOR SUNDAY...WITH A MUCH STRONG UPPER WAVE MOVING
PAST. MODELS HAVE CONSISTENTLY SHOWN A WIDESPREAD RAIN/THUNDER/HEAVY
RAINFALL SIGNAL FOR THIS EVENT THE PAST FEW DAYS...AND WILL NEED TO
WATCH THIS FOR SIGNIFICANT IMPACTS OF FLOODING AND FLASH POTENTIAL.
PWAT VALUES CONTINUE TO REPRESENT OVER 200% OF NORMAL FOR
SUNDAY/SUNDAY NIGHT...WHICH WAS THE CASE LAST NIGHT...WHEN 1 TO 5
INCHES OF RAIN FELL.
MONDAY AFTERNOON THROUGH FRIDAY...AN UPPER LOW SHIFTS
SOUTHEAST...WITH SURFACE HIGH PRESSURE. SOME DIURNAL LIGHT SHOWERS
ARE EXPECTED TUESDAY AND WEDNESDAY...BUT ANY PCPN WILL BE LIGHT.
HIGHS IN THE 60S EARLY TO MID WEEK SHOULD CLIMB TO THE LOWER 70S
BY LATER IN THE WORKWEEK. ERVIN
&&
.AVIATION... /ISSUED 1227 PM CDT FRI MAY 4 2012/
VFR CONDITIONS ARE EXPECTED THROUGH 00Z/05 WITH KCID IMPROVING TO
VFR PRIOR TO 00Z/05. STARTING AROUND 00Z/05 RAPID TSRA DVLPMNT IS
EXPECTED TO OCCUR THAT WILL EVOLVE INTO A LARGE TSRA COMPLEX. MVFR
CONDITIONS WILL DEVELOP AFT 00Z/05 WITH A HIGH PROBABILITY OF IFR
CONDITIONS WITH TSRA. IF STORMS GET SUFFICIENTLY STRONG THERE MAY
BE A CHANCE OF BRIEF LIFR CONDITIONS. CONDITIONS WILL IMPROVE TO
VFR AFT 12Z/05. ..08..
&&
.DVN WATCHES/WARNINGS/ADVISORIES...
IA...FLASH FLOOD WATCH THROUGH SATURDAY MORNING FOR BENTON-CEDAR-
CLINTON-DES MOINES-HENRY IA-IOWA-JACKSON-JEFFERSON-JOHNSON-
JONES-KEOKUK-LEE-LINN-LOUISA-MUSCATINE-SCOTT-VAN BUREN-
WASHINGTON.
IL...FLASH FLOOD WATCH THROUGH SATURDAY MORNING FOR BUREAU-CARROLL-
HANCOCK-HENDERSON-HENRY IL-MCDONOUGH-MERCER-PUTNAM-ROCK
ISLAND-WARREN-WHITESIDE.
MO...FLASH FLOOD WATCH THROUGH SATURDAY MORNING FOR CLARK-SCOTLAND.
&&Hazardous weather outlook, May 4, 4:22 AM CDT, 11 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 422 AM CDT FRI MAY 4 2012 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-050930- 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- 422 AM CDT FRI MAY 4 2012 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 MAY PRODUCE HAIL UP TO QUARTER SIZE AND HEAVY RAINFALL EARLY THIS MORNING IN EXTREME SOUTHEAST IOWA...WESTERN ILLINOIS AND EXTREME NORTHEAST MISSOURI. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS LATE THIS AFTERNOON INTO TONIGHT FOR THE ENTIRE OUTLOOK AREA. STRONG TO SEVERE THUNDERSTORMS SHOULD REDEVELOP LATER THIS AFTERNOON AND CONTINUE INTO TONIGHT. THESE STORMS MAY PRODUCE LARGE HAIL AND DAMAGING WINDS ALONG WITH TORRENTIAL RAINS THAT MAY CAUSE FLASH FLOODING. THE GREATEST FLASH FLOOD THREAT WILL BE AREAS THAT RECEIVED HEAVY RAINFALL LAST NIGHT WHERE SOILS ARE COMPLETELY SATURATED. ANOTHER FLASH FLOOD WATCH MAY BE NEEDED FOR LATER TODAY AND TONIGHT ONCE IT IS DETERMINED WHERE THE STRONGER STORMS WILL DEVELOP. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SATURDAY THROUGH EARLY MONDAY...THUNDERSTORMS WILL BE POSSIBLE THROUGHOUT THE PERIOD. SEVERE STORMS WITH LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE SATURDAY NIGHT AND AGAIN SUNDAY AFTERNOON THROUGH SUNDAY NIGHT. THE BEST CHANCE FOR THUNDERSTORMS SATURDAY NIGHT WILL BE WEST OF THE MISSISSIPPI RIVER. THE ENTIRE AREA MAY BE AT RISK FOR SEVERE STORMS SUNDAY AFTERNOON AND NIGHT. THERE WILL CONTINUE TO BE A THREAT OF FLASH FLOODING FROM LARGE THUNDERSTORM COMPLEXES WITH HEAVY RAINFALL SATURDAY THROUGH EARLY MONDAY MORNING. WITH THESE OCCASIONAL ROUNDS OF HEAVY RAINFALL AND SATURATED SOIL...THE SUBSEQUENT RUN OFF MAY LEAD TO RIVER FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND INTO TONIGHT...AND AGAIN OVER THE WEEKEND. HAASE/12
In the hours before
Local storm report, May 4, 10:21 AM CDT, 5 hours 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1021 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1030 PM TSTM WND DMG S CAMANCHE 41.79N 90.28W
05/03/2012 CLINTON IA PUBLIC
4 LARGE TREES DOWN AT ROCK CREEK MARINA. ONE TREE 30
INCHES IN DIAMETER FELL ON A MOTORHOME. ANOTHER FELL ON A
CABIN DECK. TIME ESTIMATED BY RADAR.
1210 AM TSTM WND DMG NW CONESVILLE 41.38N 91.35W
05/04/2012 MUSCATINE IA TRAINED SPOTTER
TWO LARGE TREES DOWN
1210 AM HAIL NW CONESVILLE 41.38N 91.35W
05/04/2012 E1.00 INCH MUSCATINE IA TRAINED SPOTTER
&&
MCCLURELocal storm report, May 4, 10:43 AM CDT, 4 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1043 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1037 AM HEAVY RAIN KESWICK 41.46N 92.24W
05/04/2012 M2.60 INCH KEOKUK IA DEPT OF HIGHWAYS
WESTERN PART OF KEOKUK CO. REPORTED 2.00 INCHES RAIN
BETWEEN 6AM TO 8AM. EASTERN PART OF KEOKUK HAD 2.60
INCHES BEFORE 6AM. MINOR FLASH FLOODING. ENGLISH RIVER
BASIN ON THE RISE. ESTIMATE THE WATER MAY BE OVER ROAD AT
KESWICK AND S. ENGLISH BY AFTERNOON.
&&
TEOLocal storm report, May 4, 10:51 AM CDT, 4 hours 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1051 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1038 AM HEAVY RAIN SSW LONE TREE 41.48N 91.43W
05/04/2012 M2.75 INCH JOHNSON IA TRAINED SPOTTER
STORM TOTAL
&&
TEOLocal storm report, May 4, 10:57 AM CDT, 4 hours 34 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1057 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 PM TSTM WND DMG WILTON 41.59N 91.02W
05/03/2012 MUSCATINE IA TRAINED SPOTTER
TWO LARGE TREES DOWN. TIME ESTIMATED FROM RADAR.
1210 AM HAIL CONESVILLE 41.38N 91.35W
05/04/2012 E1.00 INCH MUSCATINE IA PUBLIC
&&
MCCLURELocal storm report, May 4, 11:09 AM CDT, 4 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1109 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1108 AM HEAVY RAIN 2 ESE KEOSAUQUA 40.72N 91.92W
05/04/2012 M1.60 INCH VAN BUREN IA TRAINED SPOTTER
STORM TOTAL FROM MID TO 6AM THIS MORNING
&&
TEOLocal storm report, May 4, 11:24 AM CDT, 4 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1124 AM CDT FRI MAY 04 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0721 PM HAIL SE ATKINS 41.99N 91.86W
05/03/2012 E0.25 INCH BENTON IA TRAINED SPOTTER
0722 PM HAIL 1 NW VAN HORNE 42.02N 92.11W
05/03/2012 E0.25 INCH BENTON IA TRAINED SPOTTER
0737 PM HAIL 2 WNW VAN HORNE 42.02N 92.12W
05/03/2012 E0.75 INCH BENTON IA TRAINED SPOTTER
0808 PM HAIL 2 SSW LADORA 41.73N 92.20W
05/03/2012 E1.75 INCH IOWA IA TRAINED SPOTTER
GOLFBALL SIZED HAIL.
0816 PM HAIL W NORWAY 41.90N 91.93W
05/03/2012 E0.75 INCH BENTON IA TRAINED SPOTTER
DIME SIZED HAIL FELL BETWEEN 816 PM AND 819 PM.
0831 PM HAIL NORWAY 41.90N 91.92W
05/03/2012 E1.00 INCH BENTON IA FIRE DEPT/RESCUE
0844 PM TORNADO WAYLAND 41.15N 91.66W
05/03/2012 HENRY IA LAW ENFORCEMENT
NEAR 120TH STREET NEAR WAYLAND.
0850 PM TORNADO 2 NE WAYLAND 41.17N 91.63W
05/03/2012 WASHINGTON IA PUBLIC
TORNADO WENT OVER THE RESIDENCE AT 2711 330TH ST ABOUT 2
MILES NORTHEAST OF WAYLAND. TIME ESTIMATED. RELAYED 911
CALL FROM WASHINGTON COUNTY SHERIFF OFFICE.
0850 PM HAIL SOLON 41.81N 91.49W
05/03/2012 E1.75 INCH JOHNSON IA LAW ENFORCEMENT
0855 PM TORNADO 4 NE WAYLAND 41.19N 91.60W
05/03/2012 WASHINGTON IA TRAINED SPOTTER
HEAVY DAMAGE AT 3229 SPRUCE AVE ABOUT 4 MILES NORTHEAST
OF WAYLAND. RELAYED BY SPOTTER. TIME ESTIMATED.
0901 PM TSTM WND GST E SOLON 41.80N 91.49W
05/03/2012 E60.00 MPH JOHNSON IA TRAINED SPOTTER
0901 PM HAIL E SOLON 41.80N 91.49W
05/03/2012 E0.75 INCH JOHNSON IA TRAINED SPOTTER
0901 PM HAIL 1 N PARNELL 41.60N 92.00W
05/03/2012 E0.88 INCH IOWA IA EMERGENCY MNGR
0927 PM TSTM WND GST 2 E CENTERDALE 41.65N 91.26W
05/03/2012 E70.00 MPH CEDAR IA TRAINED SPOTTER
0952 PM HEAVY RAIN 1 SSW IOWA CITY 41.64N 91.55W
05/03/2012 M2.06 INCH JOHNSON IA ASOS
1 HOUR RAINFALL TOTAL.
0958 PM FLASH FLOOD 5 SW WASHINGTON 41.25N 91.76W
05/03/2012 WASHINGTON IA TRAINED SPOTTER
STREETS ARE FLOODED IN WASHINGTON. WATER IS ESTIMATED TO
BE 3 FEET DEEP NEAR AN UNDERPASS NEAR 2ND AVE AND E 5TH
STREET. ALSO THE INTERSECTION OF MADISON AND B AVE IS
FLOODED. SEWERS IN TOWN ARE BACKING UP.
1000 PM TSTM WND DMG WILTON 41.59N 91.02W
05/03/2012 MUSCATINE IA TRAINED SPOTTER
TWO LARGE TREES DOWN. TIME ESTIMATED FROM RADAR.
1014 PM TSTM WND GST WALCOTT 41.59N 90.78W
05/03/2012 E70.00 MPH SCOTT IA NWS EMPLOYEE
60 TO 70 MPH WIND GUSTS. RETIRED NWS EMPLOYEE.
1020 PM FLASH FLOOD 3 ENE MUSCATINE 41.44N 91.03W
05/03/2012 MUSCATINE IA TRAINED SPOTTER
STREET FLOODING ON MULTIPLE STREETS IN MUSCATINE. MU79.
1027 PM HEAVY RAIN 1 ESE WASHINGTON 41.30N 91.68W
05/03/2012 M3.13 INCH WASHINGTON IA TRAINED SPOTTER
2 HOUR RAINFALL.
1027 PM FLASH FLOOD 1 ESE WASHINGTON 41.30N 91.68W
05/03/2012 WASHINGTON IA TRAINED SPOTTER
3.13 INCHES IN THE PAST 2 HOURS WITH STREET FLOODING IN
WASHINGTON.
1030 PM TSTM WND DMG S CAMANCHE 41.79N 90.28W
05/03/2012 CLINTON IA PUBLIC
4 LARGE TREES DOWN AT ROCK CREEK MARINA. ONE TREE 30
INCHES IN DIAMETER FELL ON A MOTORHOME. ANOTHER FELL ON A
CABIN DECK. TIME ESTIMATED BY RADAR.
1058 PM FLASH FLOOD 3 NE MUSCATINE 41.45N 91.03W
05/03/2012 MUSCATINE IA TRAINED SPOTTER
2ND AVENUE NEAR LAKE PARK BLVD HAS ABOUT 2 FEET OF WATER
ON IT ON THE NORTHEAST SIDE OF MUSCATINE. PONDING OF
WATER EVERYWHERE. LO32.
1122 PM TSTM WND GST 1 W CAMBRIDGE 41.30N 90.20W
05/03/2012 E50.00 MPH HENRY IL TRAINED SPOTTER
1130 PM TSTM WND DMG GALVA 41.17N 90.04W
05/03/2012 HENRY IL EMERGENCY MNGR
SEVERAL 2 TO 4 INCH DIAMETER BRANCHES DOWN ON THE
NORTHWEST SIDE OF GALVA.
1145 PM HEAVY RAIN 2 SE COLONA 41.47N 90.32W
05/03/2012 E1.60 INCH HENRY IL TRAINED SPOTTER
RAINFALL BETWEEN 910 PM AND 1145PM.
1145 PM FLASH FLOOD COLUMBUS JUNCTION 41.28N 91.36W
05/03/2012 LOUISA IA TRAINED SPOTTER
THE WEST SIDE OF TOWN IS FLOODED. HE57.
1210 AM HAIL CONESVILLE 41.38N 91.35W
05/04/2012 E1.00 INCH MUSCATINE IA PUBLIC
1220 AM FLASH FLOOD 4 WSW TISKILWA 41.28N 89.59W
05/04/2012 BUREAU IL TRAINED SPOTTER
SEVERE FLOODING IN THE AREA. 800 N AVE IS WASHED OUT NEAR
TISKILWA. SEVERAL OTHER AREA ROADS HAVE WATER RUNNING
ACROSS THEM.
1225 AM FLASH FLOOD 1 W COLUMBUS JUNCTION 41.28N 91.38W
05/04/2012 LOUISA IA TRAINED SPOTTER
HIGHWAY 92 WEST OF COLUMBUS JUNCTION IS IMPASSABLE. LO32.
0310 AM HAIL 8 NE LURAY 40.53N 91.78W
05/04/2012 E1.00 INCH CLARK MO PUBLIC
0330 AM HAIL 1 WNW KAHOKA 40.43N 91.73W
05/04/2012 M0.88 INCH CLARK MO TRAINED SPOTTER
0335 AM FLASH FLOOD 1 WNW KAHOKA 40.43N 91.73W
05/04/2012 CLARK MO TRAINED SPOTTER
HALF A FOOT OF STANDING WATER ON SOME ROADS IN KAHOKA.
0413 AM HEAVY RAIN S WELLMAN 41.47N 91.84W
05/04/2012 M2.00 INCH WASHINGTON IA TRAINED SPOTTER
STORM TOTAL
0441 AM HEAVY RAIN 3 NNE CHARLIE HEATH MEM 40.61N 91.87W
05/04/2012 M2.50 INCH VAN BUREN IA TRAINED SPOTTER
TOTAL BETWEEN 1255 AM AND 0430 AM
0443 AM HEAVY RAIN WASHINGTON 41.30N 91.69W
05/04/2012 M3.44 INCH WASHINGTON IA TRAINED SPOTTER
FROM SPOTTER WA84 TAKEN AT KCII RADIO STATION SINCE 830PM
0522 AM HEAVY RAIN 1 W WASHINGTON 41.30N 91.72W
05/04/2012 M4.10 INCH WASHINGTON IA TRAINED SPOTTER
4.1 INCHES OF RAIN SINCE 825 PM CDT THURSDAY EVENING.
0558 AM HEAVY RAIN 2 NNW MUSCATINE 41.44N 91.08W
05/04/2012 M1.28 INCH MUSCATINE IA TRAINED SPOTTER
TOTAL FOR THE PAST 24 HOURS, BUT MOST FELL BETWEEN 9 AND
10 PM LAST EVENING.
0600 AM HEAVY RAIN 4 SE IOWA CITY 41.62N 91.48W
05/04/2012 M3.20 INCH JOHNSON IA TRAINED SPOTTER
MAJORITY OF THE TOTAL FELL BEFORE 1030 PM CDT THURSDAY
EVENING.
0648 AM HEAVY RAIN WASHINGTON 41.30N 91.69W
05/04/2012 M5.50 INCH WASHINGTON IA BROADCAST MEDIA
5.5 INCHES OF RAIN REPORTED BY SPOTTER ON COPPOCK RD.
RELAYED BY MEDIA/KCRG.
0709 AM HEAVY RAIN 5 E CEDAR RAPIDS 41.97N 91.58W
05/04/2012 M1.10 INCH LINN IA TRAINED SPOTTER
BETWEEN 7PM AND 1130 PM LAST NIGHT
0714 AM HEAVY RAIN 4 E WHAT CHEER 41.41N 92.28W
05/04/2012 M1.10 INCH KEOKUK IA TRAINED SPOTTER
24HR TOTAL SOME AREAS OF FLASH FLOODING OVERNIGHT.
0720 AM HEAVY RAIN 5 E CANTRIL 40.64N 91.98W
05/04/2012 M2.50 INCH VAN BUREN IA TRAINED SPOTTER
STILL RAINING
0731 AM HEAVY RAIN 4 N COTTER 41.35N 91.47W
05/04/2012 M2.50 INCH LOUISA IA TRAINED SPOTTER
TOTAL FROM 7PM LAST NIGHT TO 7AM THIS MORNING
0828 AM HEAVY RAIN 2 NE FORT MADISON 40.64N 91.33W
05/04/2012 M2.50 INCH LEE IA TRAINED SPOTTER
TOTAL SO FAR
0831 AM HEAVY RAIN 1 ESE WASHINGTON 41.30N 91.68W
05/04/2012 M4.72 INCH WASHINGTON IA TRAINED SPOTTER
STORM TOTAL SINCE LAST NIGHT 1.60 FOR THIS MORNINGS
STORMS
0831 AM HEAVY RAIN SSW LONE TREE 41.48N 91.43W
05/04/2012 M1.00 INCH JOHNSON IA TRAINED SPOTTER
FROM 3AM TO 6AM
0854 AM HEAVY RAIN 1 W CAMBRIDGE 41.30N 90.20W
05/04/2012 M3.10 INCH HENRY IL TRAINED SPOTTER
STORM TOTAL....1 INCH DIAMETER TREE BRANCHES
DOWN...STREET FLOODING
0915 AM HEAVY RAIN 1 WNW MORRISON 41.81N 89.98W
05/04/2012 M1.40 INCH WHITESIDE IL TRAINED SPOTTER
STORM TOTAL
1003 AM HEAVY RAIN 4 SE CANTRIL 40.60N 92.02W
05/04/2012 M4.00 INCH VAN BUREN IA TRAINED SPOTTER
STORM TOTAL
1014 AM HEAVY RAIN CAMANCHE 41.79N 90.28W
05/04/2012 M1.54 INCH CLINTON IA CO-OP OBSERVER
FROM STORM LAST NIGHT
1037 AM HEAVY RAIN KESWICK 41.46N 92.24W
05/04/2012 M2.60 INCH KEOKUK IA DEPT OF HIGHWAYS
WESTERN PART OF KEOKUK CO. REPORTED 2.00 INCHES RAIN
BETWEEN 6AM TO 8AM. EASTERN PART OF KEOKUK HAD 2.60
INCHES BEFORE 6AM. MINOR FLASH FLOODING. ENGLISH RIVER
BASIN ON THE RISE. ESTIMATE THE WATER MAY BE OVER ROAD AT
KESWICK AND S. ENGLISH BY AFTERNOON.
1038 AM HEAVY RAIN SSW LONE TREE 41.48N 91.43W
05/04/2012 M2.75 INCH JOHNSON IA TRAINED SPOTTER
STORM TOTAL
1108 AM HEAVY RAIN 2 ESE KEOSAUQUA 40.72N 91.92W
05/04/2012 M1.60 INCH VAN BUREN IA TRAINED SPOTTER
STORM TOTAL FROM MID TO 6AM THIS MORNING
&&
TEOThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 9:29 PM CDT | Tornado Warning | DVN | Mercer | 17 min |
| May 3, 10:20 PM CDT | Flash Flood Warning | DVN | Rock Island | 6 hr |
| May 3, 10:44 PM CDT | Flash Flood Warning | DVN | Henry, Mercer, Rock Island | 6 hr |
| May 3, 11:13 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry | 49 min |
| May 3, 11:59 PM CDT | Flash Flood Watch | DVN | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 3 more | 9 hr |
| May 4, 12:26 AM CDT | Flash Flood Warning | DVN | Bureau, Putnam | 6 hr |
| May 4, 2:26 AM CDT | Special Weather Statement | DVN | Hancock, Henderson, McDonough, Warren | 49 min |
| May 4, 3:07 AM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson | 38 min |
| May 4, 4:04 AM CDT | Areal Flood Warning | DVN | Mercer, Rock Island | 9 hr |
| May 3, 7:31 PM CDT | Special Weather Statement | DVN | Benton | 29 min |
| May 3, 8:23 PM CDT | Special Weather Statement | DVN | Louisa, Washington | 52 min |
| May 3, 8:23 PM CDT | Severe Thunderstorm Warning | DVN | Benton | 15 min |
| May 3, 8:27 PM CDT | Tornado Warning | DVN | Henry, Jefferson, Louisa, Washington | 33 min |
| May 3, 8:40 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Linn | 35 min |
| May 3, 8:58 PM CDT | Tornado Warning | DVN | Henry, Louisa, Muscatine, Washington | 32 min |
| May 3, 9:14 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Scott | 31 min |
| May 3, 9:46 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Muscatine, Scott | 43 min |
| May 3, 9:58 PM CDT | Flash Flood Warning | DVN | Keokuk, Louisa, Washington | 6 hr |
| May 3, 10:22 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 38 min |
| May 4, 12:06 AM CDT | Severe Thunderstorm Warning | DVN | Louisa, Muscatine | 24 min |
| May 4, 1:10 AM CDT | Flash Flood Warning | DVN | Henry, Jefferson | 6 hr |
| May 4, 2:40 AM CDT | Flash Flood Warning | DVN | Lee, Van Buren | 6 hr |
| May 4, 6:26 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 49 min |
| May 4, 6:34 AM CDT | Flash Flood Warning | DVN | Keokuk | 4 hr |
| May 4, 11:59 AM CDT | River Flood Warning | DVN | Des Moines, Henry, Lee | 71 hr |
| May 4, 8:21 AM CDT | River Flood Warning | DVN | Clark | 48 hr |
| May 4, 8:50 AM CDT | Areal Flood Warning | DVN | Clark | 6 hr |
Nearby
Flash Flood Watches in Iowa, 2012Flash Flood Watches in Illinois, 2012Flash Flood Watches in Missouri, 2012Every flash flood watch in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.