High winds during the early morning of September 7 blew a tree down onto some power lines in Carroll County. A power outage was observed in the Mount Carroll and Savanna areas.
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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.
High winds during the early morning of September 7 blew a tree down onto some power lines in Carroll County. A power outage was observed in the Mount Carroll and Savanna areas.
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 Sep 6, 1:40 PM CST, 10 hours 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 240 PM CDT MON SEP 6 2010 .SYNOPSIS... SURFACE ANALYSIS AT 2 PM SHOWS STRONG DEVELOPING LOW PRESSURE NEAR OMAHA NEBRASKA WITH STRONG CONVERGENCE ALLOWING FOR SPAWNING OF TSRA ALONG FRONT. PRESSURE FALL PATTERN SUPPORTS THESE STORMS TO INCREASE INTO EVENING...SUGGESTING A LINE OF STORMS THROUGH MID EVENING THAT MOST SOLUTIONS ARE UNDERPLAYING. PRESSURE FALL AXIS ALONG I-80 SUGGESTS STRONG WINDS TO CONTINUE UNTIL SUNSET WITH NEAR WIND ADVISORY CRITERIA NORTH TO HIGHWAY 30. VERIFICATION OF COOL AIR ON BACK SIDE OF SURFACE LOW SUGGEST SLIGHTLY DEEPER COOL AIR OVER MONTANA TO SUPPORTING VERY STRONG WINDS AFTER LOW PASSES LATER TONIGHT INTO TUESDAY PER PRESSURE RISE COUPLET. && .SHORT TERM...TONIGHT AND MONDAY... TONIGHT...UPPED POPS IN EVENING TO 40 TO 50 POPS OVER WESTERN 1/3 OF AREA AS DECAYING TSRA/SHRA MOVES IN BETWEEN 02 AND 05Z. HAVE SLIGHT CHANCE POPS AFTER MIDNIGHT BUT TRENDS SUGGEST THESE MAY BE NEED TO BE UPPED TO CHANCE AS DECAYING PRECIPITATION APPEARS TO BE OVERPLAYED BY SOLUTIONS. GUSTY SW WINDS OF 10 TO 20+ MPH MID TO LATE EVENING TO SHIFT TO THE WEST AFTER MIDNIGHT WITH SOME GUSTS TO NEAR 35 MPH AFTER FRONT PASSES FOR A FEW HOURS. LOWS TO SETTLE IN THE LOWER 50S NW TO UPPER 50 FAR SE SECTIONS. CONDITIONS DO NOT SUGGEST STORMS WILL BE STRONG ENOUGH FOR SEVERE WHEN THEY ARRIVE AFTER 02Z...OR 9 PM BUT SOME GUSTY WINDS OF 45+ MPH POSSIBLE WEST OF I-380 WITH THE STRONGEST STORMS. TUESDAY...VERY DEEP MIXING UNDER FAIR SKIES AND STRONG COOL AIR ADVECTION SUPPORTS STRONG...VERY GUSTY WINDS IN DRY SLOT. LOCAL TECHNIQUES SUGGEST 25-40+ MPH WITH SOME GUSTS NEAR TO OVER 45 MPH WITH PORTIONS OF NORTH SECTIONS TO LIKELY NEEDING A WIND ADVISORY. HAVE NOT HOISTED AN ADVISORY ATTM AS TRENDS SUGGEST AN ADVISORY MAY BE NEEDED AS FAR SOUTH AS ALONG I-80 WITH MAX WINDS BETWEEN 17Z AND 23Z. PASS TO LATER SHIFTS TO REASSESS AREAL COVERAGE. HIGHS TO RANGE FROM ~68F FAR NORTH TO ~77F...DEEP MIXING SUGGEST HIGHS ABOVE GUIDANCE. ..NICHOLS.. .LONG TERM...TUESDAY NIGHT THROUGH NEXT MONDAY... OTHER THAN BREEZY CONDITIONS TUESDAY EVENING...QUIET WX WILL BE SEEN THROUGH WEDNESDAY NIGHT AS CANADIAN HIGH PRESSURE MOVES ACROSS THE AREA. ATTENTION THEN TURNS TO THE REMNANTS OF HERMINE APPROACHING THE AREA. HERMINE WILL EITHER BE A STRONG TROPICAL CYCLONE OR A LOW END CAT 1 HURRICANE WHEN IT MAKES LANDFALL ON THE SOUTH TEXAS COAST. GIVEN THE LOW SHEAR ENVIRONMENT AND A STRONGER CDO DEVELOPING WITH EACH NEW REPLACEMENT CYCLE...A LOW END CAT 1 HURRICANE SEEMS REASONABLE. MODELS TAKE HERMINE AND MOVE HER QUICKLY NORTH INTO THE PLAINS BY 12Z THURSDAY. OVERALL FORCING AND MOISTURE TRANSPORT ALONG WITH VARIOUS TOOLS/TECHNIQUES INDICATE A SIGNIFICANT RAIN SHIELD SHOULD BE ACROSS EASTERN KANSAS/WESTERN MISSOURI BY SUNRISE THURSDAY. MOST MODELS TAKE THIS MOISTURE AND PUSH IT NORTHWARD DURING THE DAY ON A STRONG LLJ. THE STRENGTH AND AMOUNT OF THE MOISTURE TRANSPORT WILL QUICKLY OVERPOWER THE DRY AIR ACROSS THE AREA. THUS SHRA SHOULD BEGIN DEVELOPING BY LATE MORNING AND BECOME MORE NUMEROUS IN THE AFTERNOON. POPS HAVE BEEN INCREASED SOMEWHAT BUT ARE LIKELY TOO LOW. THURS NIGHT/FRI MORNING THE BULK OF THE MOISTURE FROM HERMINE MOVES THROUGH THE AREA. POPS HAVE BEEN RAISED SIGNIFICANTLY FOR THIS TIME FRAME BUT POPS WILL NEED TO BE RAISED FURTHER. A MODERATE RAIN EVENT IS ON TAP FOR THE AREA WITH LOCALLY HEAVY RAINFALL LIKELY. FCST SOUNDINGS ARE ESSENTIALLY SATURATED WITH LITTLE IF ANY CAPE. THUS NEARLY ALL THE PRECIPITATION WILL FALL AS STRATIFORM RAIN. IF THE MODELS ARE CORRECT...THERE MAY BE A BREAK IN THE RAIN LATE FRIDAY MORNING/AFTERNOON. FRIDAY NIGHT/SATURDAY...THE NEXT COLD FRONT MOVES THROUGH THE AREA. LINGERING MOISTURE FROM HERMINE WILL AID IN PRODUCING ADDITIONAL RAIN. THUS POPS HAVE BEEN RAISED A LITTLE FRIDAY NIGHT. THE CURRENT SCHC POPS FOR SATURDAY NIGHT HAVE BEEN KEPT BUT ARE NOW CONFINED TO THE EXTREME EASTERN PART OF THE CWFA. THERE IS A GOOD CHANCE THAT SATURDAY NIGHT MAY BE DRY. SUNDAY LOOKS DRY AS HIGH PRESSURE MOVES ACROSS THE AREA. SUNDAY NIGHT/MONDAY SEVERAL MODELS SHOW STRONG WAA MOVING INTO THE AREA JUST PRIOR TO SUNRISE AND MOVING ACROSS THE AREA ON MONDAY. HAVE OPTED TO GO DRY FOR NOW AS THE BETTER LLJ AND MOISTURE TRANSPORT REMAINS WELL WEST OF THE AREA. HOWEVER...MODEL SOLUTIONS ARE HIGHLY SMOOTHED THAT FAR OUT AND MAY BE HIDING A SHORTWAVE THAT IS STRONGER THAN WHAT IS DEPICTED. IF THAT WOULD BE THE CASE...THEN ONE CANNOT RULE OUT CONVECTION DEVELOPING. ..08.. && .AVIATION... VFR CONDITIONS WITH A RISK OF SCATTERED STORMS WITH FRONTAL PASSAGE BETWEEN 03 AND 07Z TONIGHT. ANY STORMS WOULD PRODUCE A BRIEF PERIOD OF MVFR WITH RAIN. STRONG WEST WINDS AND DEEP MIXING FOR LOTS OF TURBULENCE ALL TERMINALS TUESDAY UNDER A FAIR SKY. ..NICHOLS.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && NICHOLS/08
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 500 AM CDT MON SEP 6 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-071000- 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- 500 AM CDT MON SEP 6 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 SCATTERED SHOWERS AND THUNDERSTORMS WILL AFFECT THE AREA EARLY THIS MORNING BEFORE DIMINISHING BY MID MORNING TODAY. GUSTY WINDS TO AROUND 40 MPH ARE POSSIBLE WITH THESE STORMS. SOUTH WINDS WILL INCREASE TODAY TO BLOW AT 20 TO 30 MPH...WITH GUSTS TO AROUND 40 MPH AT TIMES DURING THE LATE AFTERNOON AND EARLY EVENING. THESE STRONG WINDS WILL AFFECT MAINLY AREAS SOUTHWEST OF A LINE FROM CEDAR RAPIDS IOWA TO PRINCETON ILLINOIS. STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER CENTRAL IOWA THIS AFTERNOON ALONG A COLD FRONT AND WILL MOVE QUICKLY NORTHEAST ACROSS THE NORTHWEST HALF OF THE OUTLOOK AREA THIS EVENING. THE STORMS SHOULD HAVE AN ENVIRONMENT OF STRONG DEEP LAYER SHEAR AND MODERATE TO HIGH LEVELS OF INSTABILITY. THUS...SOME OF THESE STORMS MAY BECOME SEVERE...WITH THE GREATEST THREAT FOR DAMAGING WINDS. THE STORM PREDICTION CENTER HAS PLACED AREAS NORTHWEST OF A LINE FROM CEDAR RAPIDS TO DUBUQUE IOWA IN A SLIGHT RISK OF SEVERE WEATHER. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY WINDY CONDITIONS ARE EXPECTED AGAIN ON TUESDAY. WEST WINDS WILL BLOW AT 20 TO 30 MPH WITH GUSTS DURING THE AFTERNOON TO AROUND 40 MPH. THE STRONGEST WINDS ARE EXPECTED TO OCCUR NORTH OF HIGHWAY 30. THUNDERSTORMS RETURN TO THE FORECAST FOR THURSDAY THROUGH EARLY SATURDAY. IT IS TOO SOON TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER ON THESE DAYS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING NORTHWEST OF A LINE FROM CEDAR RAPIDS TO DUBUQUE. LE
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
731 PM CDT MON SEP 6 2010
IAZ040-041-051>053-063>065-076-077-087-088-098-070130-
BENTON-BUCHANAN-CEDAR-DELAWARE-HENRY-IOWA-JEFFERSON-JOHNSON-JONES-
KEOKUK-LINN-VAN BUREN-WASHINGTON-
731 PM CDT MON SEP 6 2010
...STRONG THUNDERSTORMS MOVING IN...
AT 726 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 24 MILES WEST OF
JESUP TO 24 MILES NORTHWEST OF WHAT CHEER TO 54 MILES WEST OF
MILTON...MOVING EAST AT 55 MPH.
* THUNDERSTORMS WILL BE NEAR...
VICTOR...KEYSTONE...JESUP AND BELLE PLAINE AROUND 750 PM CDT...
WHAT CHEER...MOUNT AUBURN...LUZERNE AND LADORA AROUND 755 PM CDT...
HAZLETON AND VINTON AROUND 800 PM CDT...
ONE HALF INCH DIAMETER HAIL...WINDS GREATER THAN 40 MPH...ARE
EXPECTED WITH THESE STORMS.
SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
LAT...LON 4151 9242 4151 9231 4229 9231 4230 9207
4263 9209 4263 9118 4156 9145 4063 9192
4062 9220 4116 9219 4116 9242
TIME...MOT...LOC 0030Z 269DEG 48KT 4253 9246 4156 9269
4069 9311
DLFSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
945 PM CDT MON SEP 6 2010
IAZ041-042-052>054-063>068-076>078-087>089-098-099-ILZ001-007-015-
024-070345-
CARROLL-CEDAR-CLINTON-DELAWARE-DES
MOINES-DUBUQUE-HENRY-IOWA-JACKSON-JEFFERSON-JO
DAVIESS-JOHNSON-JONES-KEOKUK-LEE-LINN-LOUISA-MERCER-MUSCATINE-ROCK
ISLAND-SCOTT-VAN BUREN-WASHINGTON-
945 PM CDT MON SEP 6 2010
...THUNDERSTORMS MOVING THROUGH EASTERN IOWA...
AT 942 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTH OF
GREELEY TO SPRINGVILLE TO 9 MILES WEST OF MILTON...MOVING EAST AT 50
MPH.
* THUNDERSTORMS WILL BE NEAR...
UNIVERSITY OF IOWA...UNIVERSITY HEIGHTS...SOLON AND RICHMOND AROUND
950 PM CDT...
WORTHINGTON...PLEASANT PLAIN...NEW VIENNA AND MORLEY AROUND 955 PM
CDT...
WASHINGTON AND RIVERSIDE AROUND 1000 PM CDT...
WINDS GREATER THAN 35 MPH...ARE EXPECTED WITH THESE STORMS.
IF YOU HEAR THUNDER, MOVE IMMEDIATELY TO A STURDY BUILDING OR CAR
UNTIL THE STORM HAS PASSED.
LAT...LON 4265 9072 4251 9062 4251 9017 4225 9022
4083 9121 4065 9220 4101 9219 4204 9150
4265 9140 4265 9091 4269 9088
TIME...MOT...LOC 0245Z 257DEG 45KT 4268 9126 4206 9137
4071 9228
DLFThe national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
High winds during the early morning of September 7 blew a tree down onto some power lines in Carroll County. A power outage was observed in the Mount Carroll and Savanna areas.
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, September 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: 259765.