A Tropical-Like Air Mass Brought Efficient Rainfall on Sunday Afternoon and Night

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Text Listings of Rainfall Reports

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
940 AM CDT MON AUG 27 2012

...MORNING RAINFALL ROUNDUP...

   THE FOLLOWING ARE RAIN AMOUNTS FOR THE PREVIOUS 24-HOURS
   AS MEASURED IN THE MORNING BY NWS COOPERATIVE OBSERVERS
   AND COCORAHS OBSERVERS.
   OBSERVATIONS ARE USUALLY TAKEN BETWEEN 6 AND 8 AM.

   24-HOUR RAINFALL AMOUNTS
       FOR MONDAY(08/27/12)...


ILLINOIS                                       RAIN
  LOCATION (COUNTY):                           FALL (IN)

  NORTH RIVERSIDE (COOK).......................4.53
  LA GRANGE PARK 1SSW (COOK)...................4.27
  CHICAGO 5NE (COOK)...........................4.23
  LA GRANGE (COOK).............................3.98
  COUNTRYSIDE 1ENE (COOK)......................3.92
  COUNTRYSIDE 1NNE (COOK)......................3.90
  OAK PARK 2S (COOK)...........................3.86
  LA GRANGE PARK 1NE (COOK)....................3.83
  MIDWAY (COOK)................................3.66
  NAPERVILLE 3ESE (DU PAGE)....................3.65
  WESTMONT (DU PAGE)...........................3.42
  CHICAGO 6ESE (COOK)..........................3.37
  LISLE (DU PAGE)..............................3.35
  STREATOR (LIVINGSTON)........................3.30
  DOWNERS GROVE 2SE (DU PAGE)..................3.24
  GLEN ELLYN (DU PAGE).........................3.23
  BURR RIDGE 2SW (DU PAGE).....................3.23
  CLARENDON HILLS 1S (DU PAGE).................3.21
  LISLE 1SE (DU PAGE)..........................3.20
  OAK BROOK (DU PAGE)..........................3.17
  ROMEOVILLE (WILL)............................3.11
  MIDWAY 3SW (COOK)............................3.08
  MENDOTA 1N (LA SALLE)........................3.04
  GLEN ELLYN 2SSE (DU PAGE)....................3.03
  WESTMONT 1SSE (DU PAGE)......................3.02
  WILLOW SPRINGS (COOK)........................3.00
  SUGAR GROVE 2ENE (KANE)......................2.90
  MONTGOMERY 2SSE (KENDALL)....................2.89
  MONTGOMERY 1SSE (KENDALL)....................2.84
  BRACEVILLE (GRUNDY)..........................2.82
  OAK PARK 1NNE (COOK).........................2.78
  NAPERVILLE 2ESE (DU PAGE)....................2.66
  SUGAR GROVE 1ENE (KANE)......................2.64
  ORLAND PARK 5WNW (WILL)......................2.59
  BOLINGBROOK 3NE (DU PAGE)....................2.58
  WARRENVILLE 1NNW (DU PAGE)...................2.57
  AURORA 4SE (DU PAGE).........................2.54
  NAPERVILLE 4SSW (WILL).......................2.51
  CHICAGO RIDGE (COOK).........................2.49
  NAPERVILLE 4SSW (WILL).......................2.47
  BATAVIA (KANE)...............................2.46
  WILMINGTON 6NW (WILL)........................2.45
  MILFORD (IROQUOIS)...........................2.42
  PLAINFIELD 1SW (WILL)........................2.34
  DWIGHT (LIVINGSTON)..........................2.33
  JOLIET 3NW (WILL)............................2.32
  NORTH AURORA 2NE (KANE)......................2.29
  HOMER GLEN 1ENE (WILL).......................2.28
  LOCKPORT 3ESE (WILL).........................2.26
  CHANNAHON (WILL).............................2.25
  MENDOTA 2SE (LA SALLE).......................2.25
  LOCKPORT 1SE (WILL)..........................2.25
  BATAVIA 1WSW (KANE)..........................2.23
  CHANNAHON 2SSE (WILL)........................2.23
  FAIRBURY (LIVINGSTON)........................2.21
  STREATOR 1S (LIVINGSTON).....................2.21
  EARLVILLE 3S (LA SALLE)......................2.20
  ODELL 4SE (LIVINGSTON).......................2.20
  MENDOTA (LA SALLE)...........................2.18
  OAK LAWN (COOK)..............................2.17
  AURORA (KANE)................................2.13
  SUGAR GROVE 1NE (KANE).......................2.12
  PLAINFIELD 2SSE (WILL).......................2.12
  CHATSWORTH (LIVINGSTON)......................2.11
  WHEATON (DU PAGE)............................2.11
  CHATSWORTH (LIVINGSTON)......................2.11
  SHELDON 3NE (IROQUOIS).......................2.01
  BATAVIA 1W (KANE)............................2.00
  PONTIAC 1ESE (LIVINGSTON)....................2.00
  CHANNAHON 1NNE (WILL)........................1.99
  PEOTONE (WILL)...............................1.98
  PEOTONE (WILL)...............................1.98
  PEOTONE (WILL)...............................1.97
  JOLIET LOCK/DAM (WILL).......................1.95
  CHENOA 4NNW (LIVINGSTON).....................1.94
  PEOTONE (WILL)...............................1.92
  JOLIET (WILL)................................1.91
  JOLIET 2N (WILL).............................1.89
  WATSEKA (IROQUOIS)...........................1.86
  MAZON (GRUNDY)...............................1.84
  PONTIAC 1SE (LIVINGSTON).....................1.82
  MONEE (WILL).................................1.82
  BUCKLEY (IROQUOIS)...........................1.81
  BATAVIA 1WNW (KANE)..........................1.81
  PIPER CITY (FORD)............................1.81
  YORKVILLE 1NE (KENDALL)......................1.78
  RICHTON PARK (COOK)..........................1.75
  OAK LAWN 2SE (COOK)..........................1.74
  YORKVILLE 1W (KENDALL).......................1.71
  CHICAGO 6NNE (COOK)..........................1.69
  PLAINFIELD 5SW (KENDALL).....................1.69
  MANHATTAN 2SE (WILL).........................1.68
  SHABBONA (DE KALB)...........................1.68
  ALSIP (COOK).................................1.67
  AMBOY (LEE)..................................1.66
  AURORA (KANE)................................1.64
  PAXTON (FORD)................................1.64
  LOMBARD 1NNW (DU PAGE).......................1.63
  GLEN ELLYN 1NE (DU PAGE).....................1.61
  MORRIS 6ESE (GRUNDY).........................1.61
  OTTAWA 2N (LA SALLE).........................1.61
  COAL CITY 4NNW (GRUNDY)......................1.60
  BATAVIA 2WNW (KANE)..........................1.59
  AMBOY (LEE)..................................1.55
  PARK FOREST (COOK)...........................1.55
  LOMBARD 1NNW (DU PAGE).......................1.53
  SUBLETTE (LEE)...............................1.53
  PAW PAW (LEE)................................1.53
  WATSEKA 5W (IROQUOIS)........................1.52
  OTTAWA (LA SALLE)............................1.52
  FLOSSMOOR (COOK).............................1.47
  JOLIET (WILL)................................1.47
  VILLA PARK 1NW (DU PAGE).....................1.46
  GENEVA 1SSW (KANE)...........................1.44
  LANSING (COOK)...............................1.43
  GLEN ELLYN 1NNW (DU PAGE)....................1.43
  ORLAND HILLS 1SE (COOK)......................1.42
  BONFIELD 4WSW (KANKAKEE).....................1.42
  EMINGTON 2SSE (LIVINGSTON)...................1.40
  OSWEGO 5SSE (KENDALL)........................1.38
  YORKVILLE 2SE (KENDALL)......................1.38
  GENEVA 2ENE (KANE)...........................1.36
  WINFIELD (DU PAGE)...........................1.36
  SENECA 1NE (LA SALLE)........................1.35
  CRETE 3SSW (WILL)............................1.35
  LANSING (COOK)...............................1.34
  ORLAND HILLS 1S (COOK).......................1.31
  DRESDEN LOCK/DAM (GRUNDY)....................1.30
  BEECHER 3SSE (WILL)..........................1.29
  CRETE 3E (WILL)..............................1.29
  PARK FOREST 1NNE (COOK)......................1.28
  HOMEWOOD (COOK)..............................1.26
  MINOOKA (GRUNDY).............................1.25
  OTTAWA 1NW (LA SALLE)........................1.24
  EARLVILLE 8SSE (LA SALLE)....................1.23
  MARSEILLES (LA SALLE)........................1.23
  BONFIELD 4NNE (KANKAKEE).....................1.21
  PERU (LA SALLE)..............................1.19
  ST ANNE (KANKAKEE)...........................1.18
  WORTH (COOK).................................1.17
  SHERIDAN 3SSE (LA SALLE).....................1.17
  MOKENA 1W (WILL).............................1.16
  LA SALLE (LA SALLE)..........................1.13
  CAROL STREAM (DU PAGE).......................1.12
  OAK LAWN 1N (COOK)...........................1.09
  MANHATTAN 5ENE (WILL)........................1.09
  OTTAWA (LA SALLE)............................1.08
  SENECA 2SSW (LA SALLE).......................1.07
  NEW LENOX 4SE (WILL).........................1.07
  PERU 1SW (LA SALLE)..........................1.05
  OGLESBY 1ESE (LA SALLE)......................1.05
  ROCKTON 1ESE (WINNEBAGO).....................1.05
  MANHATTAN (WILL).............................1.05
  FRANKFORT 2NNE (WILL)........................1.04
  MARSEILLES 3NW (LA SALLE)....................1.03
  GENEVA 2WSW (KANE)...........................0.99
  CAROL STREAM 1WNW (DU PAGE)..................0.98
  BOURBONNAIS 2NNE (KANKAKEE)..................0.96
  KANKAKEE 3SE (KANKAKEE)......................0.96
  GRANT PARK 6ENE (KANKAKEE)...................0.94
  KANKAKEE (KANKAKEE)..........................0.94
  BOURBONNAIS (KANKAKEE).......................0.93
  MANTENO 2SSE (KANKAKEE)......................0.93
  GENEVA 3WSW (KANE)...........................0.91
  CHEBANSE (KANKAKEE)..........................0.86
  ROSCOE 2ESE (WINNEBAGO)......................0.86
  ROSCOE 2SE (WINNEBAGO).......................0.86
  NEW LENOX 2SE (WILL).........................0.85
  NEWARK (KENDALL).............................0.84
  HARWOOD HEIGHTS 2NNE (COOK)..................0.83
  STEWARD (LEE)................................0.83
  PARK RIDGE (COOK)............................0.82
  MOMENCE 3NE (KANKAKEE).......................0.81
  GENEVA 1WNW (KANE)...........................0.81
  WEST CHICAGO (DU PAGE).......................0.80
  MORRIS (GRUNDY)..............................0.78
  ROSELLE 1ESE (DU PAGE).......................0.73
  KANKAKEE (KANKAKEE)..........................0.70
  LINCOLNWOOD 2E (COOK)........................0.70
  ASHTON (LEE).................................0.69
  WINNETKA 1ESE (COOK).........................0.66
  ELK GROVE VILLAGE 2WSW (COOK)................0.66
  ST. CHARLES (KANE)...........................0.66
  ELBURN (KANE)................................0.64
  HANOVER PARK 2SSW (DU PAGE)..................0.63
  INVERNESS 2S (COOK)..........................0.62
  WEST CHICAGO 3N (DU PAGE)....................0.62
  ELBURN (KANE)................................0.62
  DIXON 2SW (LEE)..............................0.60
  EVANSTON 1SSE (COOK).........................0.59
  PALATINE 1E (COOK)...........................0.57
  SCHAUMBURG 2SW (COOK)........................0.57
  OHARE (COOK).................................0.57
  SCHAUMBURG 3WSW (COOK).......................0.55
  SCHAUMBURG  2E (COOK)........................0.54
  ELK GROVE VILLAGE 1ESE (COOK)................0.53
  DIXON 3NNW (LEE).............................0.53
  LAKE FOREST 2NNE (LAKE)......................0.52
  ROCHELLE (OGLE)..............................0.51
  BELVIDERE (BOONE)............................0.50
  HARVARD (MCHENRY)............................0.50
  LINCOLNSHIRE 1.3WSW (LAKE)...................0.49
  LONG GROVE 1NNE (LAKE).......................0.48
  LINCOLNSHIRE 1N (LAKE).......................0.48
  ROCHELLE (OGLE)..............................0.48
  GLENCOE (COOK)...............................0.47
  ST CHARLES 7NW (KANE)........................0.46
  MALTA (DE KALB)..............................0.45
  LAKE ZURICH (LAKE)...........................0.45
  WHEELING (COOK)..............................0.45
  CORTLAND (DE KALB)...........................0.44
  HARVARD (MCHENRY)............................0.42
  BOTANIC GARDENS (COOK).......................0.41
  BARTLETT 1SSE (DU PAGE)......................0.41
  ST. CHARLES 6NW (KANE).......................0.41
  CHICAGO 5NNW (COOK)..........................0.40
  BANNOCKBURN (LAKE)...........................0.40
  RIVERWOODS (LAKE)............................0.40
  HARVARD 1S (MCHENRY).........................0.39
  DE KALB (DE KALB)............................0.38
  POPLAR GROVE 5NNE (BOONE)....................0.38
  HOFFMAN ESTATES 5W (COOK)....................0.38
  ELGIN 1WSW (KANE)............................0.38
  OREGON (OGLE)................................0.38
  MUNDELEIN (LAKE).............................0.36
  ELGIN (KANE).................................0.35
  BARRINGTON (LAKE)............................0.34
  ELGIN 2W (KANE)..............................0.34
  HAWTHORN WOODS 1N (LAKE).....................0.34
  ROCKFORD 2ENE (WINNEBAGO)....................0.32
  ROCKFORD (WINNEBAGO).........................0.31
  SYCAMORE 2NNE (DE KALB)......................0.30
  ELGIN 2WNW (KANE)............................0.30
  PINGREE GROVE 1NW (KANE).....................0.30
  BYRON 3N (OGLE)..............................0.28
  ALGONQUIN 1N (MCHENRY).......................0.27
  ROCKFORD 3NE (WINNEBAGO).....................0.27
  MUNDELEIN (LAKE).............................0.27
  GENOA (DE KALB)..............................0.26
  ROCKFORD 4NW (WINNEBAGO).....................0.25
  BEACH PARK 1W (LAKE).........................0.24
  CARY 2NE (MCHENRY)...........................0.24
  CARY (MCHENRY)...............................0.24
  ROCKFORD 1NW (WINNEBAGO).....................0.24
  HUNTLEY 4W (MCHENRY).........................0.23
  WAUCONDA (LAKE)..............................0.23
  SPRING GROVE 2N (MCHENRY)....................0.22
  WAUKEGAN 2N (LAKE)...........................0.21
  WINTHROP HARBOR (LAKE).......................0.21
  ZION (LAKE)..................................0.21
  WINTHROP HARBOR 1SSW (LAKE)..................0.21
  WONDER LAKE 1WNW (MCHENRY)...................0.21
  GURNEE 2W (LAKE).............................0.19
  WOODSTOCK 4SW (MCHENRY)......................0.19
  PECATONICA 2S (WINNEBAGO)....................0.19
  MARENGO (MCHENRY)............................0.19
  LAKEMOOR 2SE (LAKE)..........................0.18
  BULL VALLEY 2WNW (MCHENRY)...................0.18
  MCHENRY (MCHENRY)............................0.18
  WOODSTOCK 5NW (MCHENRY)......................0.18
  WAUKEGAN (LAKE)..............................0.17
  GURNEE 2NE (LAKE)............................0.15
  LAKE VILLA 1SSW (LAKE).......................0.14

INDIANA                                        RAIN
  LOCATION (COUNTY):                           FALL (IN)

  EARL PARK 2SSE (BENTON)......................3.20
  REMINGTON (JASPER)...........................2.51
  REMINGTON (JASPER)...........................2.12
  MOUNT AYR 2NNE (NEWTON)......................2.05
  RENSSELAER 5NW (JASPER)......................1.92
  ST. JOHN (LAKE)..............................1.86
  MOROCCO (NEWTON).............................1.85
  RENSSELAER (JASPER)..........................1.81
  RENSSELAER 4N (JASPER).......................1.80
  BROOK 4W (NEWTON)............................1.75
  DYER 1WNW (LAKE).............................1.61
  RENSSELAER 2SSW (JASPER).....................1.60
  PORTAGE 3E (PORTER)..........................1.57
  KENTLAND (NEWTON)............................1.56
  VALPARAISO 6NW (PORTER)......................1.53
  KENTLAND 2SSE (NEWTON).......................1.49
  KENTLAND 1NNW (NEWTON).......................1.48
  HOBART 2E (LAKE).............................1.46
  VALPARAISO 2NW (PORTER)......................1.46
  CROWN POINT 2WSW (LAKE)......................1.45
  RENSSELAER 5E (JASPER).......................1.41
  PORTAGE 1ESE (PORTER)........................1.41
  CROWN POINT 1N (LAKE)........................1.40
  VALPARAISO 7WSW (PORTER).....................1.37
  VALPARAISO 5NNE (PORTER).....................1.36
  VALPARAISO 2N (PORTER).......................1.36
  VALPARAISO 5NNE (PORTER).....................1.36
  LAKE VILLAGE (NEWTON)........................1.35
  PORTER 1S (PORTER)...........................1.34
  SCHERERVILLE 2WSW (LAKE).....................1.32
  VALPARAISO 1NNW (PORTER).....................1.32
  (WV90)HOBART 1ENE (LAKE).....................1.31
  RENSSELAER 10NNE (JASPER)....................1.30
  HAMMOND 3SW (LAKE)...........................1.27
  DE MOTTE 6S (JASPER).........................1.25
  (KB9UUO)NEW CHICAGO 1SSE (LAKE)..............1.25
  VALPARAISO 1ENE (PORTER).....................1.24
  PORTER 1S (PORTER)...........................1.23
  WHEATFIELD 3S (JASPER).......................1.15
  VALPARAISO 6WSW (PORTER).....................1.13
  VALPARAISO 1SE (PORTER)......................1.07
  WHEATFIELD 2ENE (JASPER).....................0.99
  DE MOTTE 3SE (JASPER)........................0.98
  VALPARAISO 4SW (PORTER)......................0.98
  CHESTERTON 1ENE (PORTER).....................0.96
  VALPARAISO 6SSW (PORTER).....................0.95
  HEBRON 4NE (PORTER)..........................0.95
  (W9OPR)WHEATFIELD 1ENE (JASPER)..............0.94
  LAKES OF THE FOUR SEASONS (PORTER)...........0.94
  DE MOTTE 4SW (JASPER)........................0.91
  VALPARAISO 1SSW (PORTER).....................0.89
  HIGHLAND 1S (LAKE)...........................0.88
  (KB9F)VALPARAISO 4S (PORTER).................0.84
  DE MOTTE 1SSW (JASPER).......................0.82
  WHEATFIELD 6NW (JASPER)......................0.80
  KOUTS 2WSW (PORTER)..........................0.80
  DE MOTTE 1NNW (JASPER).......................0.78
  VALPARAISO (PORTER)..........................0.67


THE NATIONAL WEATHER SERVICE THANKS ITS PRIVATE AND PUBLIC PARTNERS
FOR PROVIDING US WITH THIS DATA.

$$

 Maps

Check Update Times 

KLOT Dual-Polarization Radar Rainfall Estimate Through 4:30 am Monday Morning

Storm Total Precipitation

Local Area Rainfall

Rainfall from COOP Observers

From NWS Cooperative Observers, updated hourly 7-11 am

 

Illinois Rainfall

Indiana Rainfall

Illinois Rainfall

Indiana Rainfall

From NWS Cooperative Observers, updated around 10 am

From various official and unofficial sources, updated around 10 am


 Meteorology

 

  • Water Vapor Analysis

        A trough of low pressure approached Illinois and Indiana from the central Plains on Sunday, steering deep moisture from both the eastern Pacific and Gulf of Mexico into the area.  This was a key ingredient in helping the showers and storms to be efficient rain producers.   The atmospheric precipitable water (PWAT) measured on the NWS Lincoln weather balloon launch Sunday evening was a remarkably high 2.17 inches.  This was within the highest one percentile moisture values for central Illinois during August.  Also to reflect how tropical of an air mass was in place, this 2.17 inch PWAT was actually just as much moisture as measured on the NWS Tampa balloon launch at the same time, and that location was under the periphery of then Tropical Storm Isaac!  Below is an analysis of precipitable water from Sunday evening at 5 pm, showing the tongue of high values covering a large area and directed towards northeast Illinois and northwest Indiana.

    5 pm Precipitable Water Analysis

    Precipitable Water Analysis

        You may have noticed rain drops were generally smaller, or more fine, than typical on Sunday.  Tropical air masses often can generate smaller diameter rain drops but a much higher abundance of those drops, leading to a greater overall accumulation rate.  Such was the case on Sunday afternoon and evening.

        Along with the high moisture values, the inflow winds through much of the cloud depths were from the southwest, parallel to the high PWAT tongue.  Such aligned flow is perfect for moisture replenishment in showers and storms, keeping them efficient rain producers for a long period.



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