Tight pressure gradient behind a low pressure system caused gusty winds through the day on April 4th.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Tight pressure gradient behind a low pressure system caused gusty winds through the day on April 4th.
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 Apr 3, 2:02 PM CST, 2 hours 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 302 PM CDT TUE APR 3 2007 .SYNOPSIS... LATEST SFC ANALYSIS WAS INDICATING THAT MAIN SFC LOW SHIFTING ACRS NORTHEAST IL ATTM...WITH SECONDARY LOW SOUTHWEST OF THE STL AREA. THIS NE IL PRIMARY LOW A RESULT OF SOME ENERGY TRANSFER FROM THE SECONDARY MO LOW...MUCH LIKE THE 12Z NAM ADVERTISED WOULD HAPPEN. VERY ROBUST PRESSURE RISE-FALL COUPLET MAKING ITS WAY BEHIND THE LOW AND OVER THE LOCAL FCST AREA ATTM...HELPING INDUCE FIRST GOOD WAVE OF ISALLOBARIC WIND SURGE INTO EASTERN IA...WITH MANY SITES NEAR OR AT WIND ADVISORY CRITERIA ALREADY. ALOFT...W/V LOOP WAS INDICATING STRONG VORT SHEARING OUT JUST TO THE NORTH OF THE AREA OVER SOUTHERN MN...AND A STOUT MID AND HIGH LEVEL DRY STREAK WHIRLING EASTWARD TO THE SOUTH OF IT. && .NEAR TERM...TONIGHT...BESIDES THE ABOVE MENTIONED PRESSURE RISE SURGE OF WINDS LATE THIS AFTERNOON...EXPECT TIGHTENING SFC PRESSURE GRADIENT AND OPTIMUM MIX DOWN POTENTIAL UP TO H85 MB TO KEEP WINDS GOING NEAR OR ABOVE ADVISORY CRITERIA AT LEAST THROUGH 06Z AND HAVE ALREADY ISSUED A WIND ADVISORY FROM NOW THROUGH 12Z WED. EXPECT A DIURNAL DECREASE AFTER MIDNIGHT POSSIBLY BELOW CRITERIA...BUT FOR NOW KEPT ADVISORY GOING FOR AN EVEN PERIOD. THE FAR SOUTHERN CWA MAY ALSO BE MARGINAL FOR ADVISORY CONDITIONS AWAY FROM MORE OPTIMUM/TIGHTER GRADIENT...BUT WENT WITH ENTIRE CWA ANYWAY TO MAKE THINGS EASIER. WITH SUCH BIG WEDGE OF MID AN HIGH LEVEL DRYING OVERTAKING THE AREA...CUT BACK ON WRAP AROUND SNOW SHOWERS TO JUST THE FAR NORTHEASTERN CWA/NORTHWEST IL ALONG THE WI BORDER LATER TONIGHT. WILL ALSO GO MOSTLY CLOUDY FOR MOST OF THE CWA THROUGH 12Z WED TAKING INTO ACCOUNT WRAP AROUND LLVL STRATUS GETTING TRAPPED UNDER BUILDING H85-H8 MB SUBSIDENCE INVERSION...BUT MIXING OF DRY MID LEVELS MAY HAVE EVENTUALLY HAVE ITS EFFECT AND SCOUR OUT THE SOUTHWESTERN FCST AREA AS THE NIGHT PROGRESSES. WITH SUCH A COLD AIRMASS UPSTREAM...LONG FETCH TRAJECTORIES FROM WEST CENTRAL AND NORTH CENTRAL MN SUPPORT LOWS IN THE LOW TO MID 20S BY WED MORNING. WILL NOT GO QUITE THIS COLD TAKING INTO ACCOUNT CLOUD COVER AND INHERENT MIXING OF STRONG WINDS...BUT THE NORTHWEST CWA MAY STILL GET CLOSE. ..12.. .LONGER TERM...WEDNESDAY THROUGH NEXT TUESDAY... COLD CYCLONIC FLOW IN PLACE WEDNESDAY AND WEDNESDAY NIGHT KEEPING COLD AND WINDY CONDITIONS OVER THE CWA. AIR UPSTREAM FROM CWA IS QUITE COLD FOR EARLY APRIL WITH MID AFTERNOON TEMPS ONLY IN THE MID 20S OVER PARTS OF EASTERN SD AND SW MN. WITH THIS IN MIND HAVE KEPT TEMPS CLOSE TO THE COLDER MET GUIDANCE FOR WEDNESDAY AND WEDNESDAY NIGHT WITH HIGHS IN THE MID 30S N TO THE LOW 40S SOUTH AND LOWS IN THE LOW TO MID 20S WEDNESDAY NIGHT. MID 30S MAY BE OPTIMISTIC FOR THE NERN COUNTIES IF THE WRAP AROUND SC STAYS OVER THE AREA THROUGH THE DAY. ALSO REMOVED MENTION OF FLURRIES. BOTH THE GFS AND NAM FCST SOUNDINGS SHOW A STRONG INVERSION ABOVE 800MB LIMITING THE VERTICAL EXTENT OF ANY CU WEDNESDAY. MODELS CONTINUE TO SHOW UPPER LOW BECOMING ESTABLISHED OVER EASTERN CANADA FROM THURSDAY THROUGH SATURDAY THEN LIFTING NE. STRONG AND DEEP CYCLONIC FLOW AROUND THE CANADIAN VORTEX WILL CONTINUE TO FUNNEL UNSEASONABLY COLD AND DRY AIR INTO THE REGION. TEMPS THEN WILL BE THE BIGGEST CONCERN WITH READINGS ABOUT 10 TO 15 DEGREES BELOW NORMAL THROUGH SATURDAY. THE GFS AND ECMWF BOTH SUGGEST H8 TEMPS WILL BE ROUGHLY IN THE -8C TO -12C RANGE THROUGH LATE THURSDAY. THE GFS...THEN BRINGS IN A CHUNK OF -12C TO -16C AIR BEHIND A LOBE OF ENERGY ROTATING AROUND THE UPPER LOW. THE ECMWF ALSO SHOWS THIS FEATURE BUT LACKS THE COLD AIR...SHOWN ON THE GFS. IF THE GFS VERIFIES THEN WE COULD SEE RECORD LOWS FOR THE END OF THE WEEK. BY THE BEGINNING OF NEXT WEEK THE BOTH THE ECMWF AND GFS SHOW THE CANADIAN UPPER LOW MOVING NORTHEAST...ALLOWING THE LOW LEVEL FLOW TO BECOME SWLY...SUPPORTING MODERATING TEMPS. THE MODELS ARE ALSO SUGGESTING SOME S/W ENERGY WILL MOVE SE THROUGH THE REGION BY TUESDAY...WHICH MAY TRIGGER SOME SHRA/TSRA. ..DLF.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...WIND ADVISORY TONIGHT. IL...WIND ADVISORY TONIGHT. MO...WIND ADVISORY TONIGHT. 12/DLF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 500 AM CDT TUE APR 3 2007 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-041000- 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- 500 AM CDT TUE APR 3 2007 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 TODAY...THUNDERSTORMS WILL CONTINUE THIS MORNING AHEAD OF A STRONG COLD FRONT. MORE THUNDERSTORMS WILL REDEVELOP THIS AFTERNOON IN ILLINOIS. THE PRIMARY THREAT SHOULD BE LARGE HAIL...POSSIBLY UP TO THE SIZE OF QUARTERS. HOWEVER...DAMAGING WINDS MAY ALSO BE POSSIBLE MAINLY THIS AFTERNOON. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE WHICH MAY RESULT IN LOCALIZED FLOODING. THE STORM PREDICTION CENTER HAS A SLIGHT RISK OF SEVERE WEATHER OUT FOR NEARLY ALL OF EASTERN IOWA...NORTHERN MISSOURI...AND PARTS OF NORTHERN ILLINOIS. FLOODING CONTINUES AND WILL OCCUR ON MOST AREA TRIBUTARIES THE NEXT WEEK DUE TO HEAVY RAINFALL OVER THE PAST 24 HOURS. LATE THIS AFTERNOON AND TONIGHT...STRONG NORTHWEST WINDS OF 25 MPH TO OVER 40 MPH ARE EXPECTED BEHIND THE COLD FRONT. A WIND ADVISORY MAY BE NEEDED FOR AN EXTENDED PERIOD OF TIME DUE TO HIGH WINDS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY WEDNESDAY...STRONG NORTHWEST WINDS OF 25 MPH TO OVER 40 MPH ARE EXPECTED BEHIND THE COLD FRONT. A WIND ADVISORY MAY BE NEEDED FOR AN EXTENDED PERIOD OF TIME DUE TO HIGH WINDS. FLOODING ON MANY AREA RIVERS WILL CONTINUE THROUGH THE PERIOD. PLEASE SEE LOCAL HYDROLOGIC PRODUCTS AND STATEMENTS FOR FURTHER INFORMATION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS ANTICIPATED FROM LATE THIS AFTERNOON INTO TUESDAY. NICHOLS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
348 PM CDT TUE APR 03 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1144 PM HAIL DYERSVILLE 42.48N 91.12W
04/02/2007 E0.75 INCH DUBUQUE IA EMERGENCY MNGR
TIME OF OCCURRENCE IS ESTIMATED.
1153 PM HAIL CASCADE 42.30N 91.01W
04/02/2007 E0.75 INCH DUBUQUE IA EMERGENCY MNGR
TIME OF OCCURRENCE IS ESTIMATED.
&&
DLFThe national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
An open pavilion at the fairgrounds on the west side of Southeast Community College in West Burlington sustained damage to some light fixtures.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2007Every state in 2007This day in weather historyWarnings in Iowa, April 2007
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: 27730.