Light to moderate snow will continue into Saturday over the Great Lakes, Central Appalachians, and Northeast. This weekend into next week, a series of atmospheric rivers will bring gusty winds, periods of heavy rain, and mountain snow to northern California and the Pacific Northwest. Colder temperatures are in store for the weekend from the Great Lakes to East Coast. Read More >
Overview
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Fast Facts:
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.png) Map showing the reports of wind reports, thunderstorm damage, and heavy rainfall from the morning of July 19th. |
Storm Reports and Photos
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| Wind damage in Forest Park, IL (courtesy of Zack Pearson) |
Wind damage in Summit, IL (courtesy of Anastasia Kwit) |
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| Wind damage in Oak Park, IL (courtesy of Richard and Gloria Ballard) |
Flooding in Joliet, IL (courtesy of Twitter user @Axel48696392) |
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO IL
108 PM CDT MON JUL 20 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1200 PM TSTM WND GST 4 SW BAILEYS CORNER 41.03N 87.05W
07/19/2020 M86 MPH JASPER IN TRAINED SPOTTER
.
1140 AM TSTM WND GST 3 SW MIDWAY AIRPORT 41.74N 87.78W
07/19/2020 M65 MPH COOK IL CO-OP OBSERVER
1150 AM MARINE TSTM WIND 3 NE NAVY PIER 41.92N 87.57W
07/19/2020 M61 MPH LMZ741 IL C-MAN STATION
CORRECTS PREVIOUS TSTM WND GST REPORT FROM 3
NE NAVY PIER FOR WIND SPEED. MEASURED AT THE
CHICAGO HARRISON-DEVER CRIB.
1138 AM TSTM WND GST MIDWAY AIRPORT 41.78N 87.75W
07/19/2020 M55 MPH COOK IL ASOS
1125 AM TSTM WND GST 2 N PAPINEAU 40.99N 87.71W
07/19/2020 M52 MPH IROQUOIS IL MESONET
.
0920 AM TSTM WND GST 3 ESE VALPARAISO 41.45N 87.01W
07/19/2020 M51 MPH PORTER IN ASOS
0815 AM TSTM WND GST MORRIS 41.36N 88.42W
07/19/2020 M42 MPH GRUNDY IL EMERGENCY MNGR
PEAK MEASURED WIND GUST OF 42 MPH. TREE
LIMBS ARE DOWN AND ON POWER LINES ACROSS
MORRIS AND NEAR COAL CITY. TIME ESTIMATED BY
RADAR.
1207 PM HEAVY RAIN OAK FOREST 41.60N 87.74W
07/19/2020 M3.25 INCH COOK IL TRAINED SPOTTER
FROM THIS MORNING.
1140 AM HEAVY RAIN 3.1 N CARBON HILL 41.34N 88.30W
07/19/2020 M3.06 INCH GRUNDY IL COCORAHS
STORM TOTAL NOW. RAIN HAS ENDED.
0912 AM HEAVY RAIN 0.1 ESE HOMEWOOD 41.56N 87.66W
07/19/2020 M2.45 INCH COOK IL COCORAHS
STORM TOTAL SINCE 634 AM.
1035 AM HEAVY RAIN 3.1 N CARBON HILL 41.34N 88.30W
07/19/2020 M1.94 INCH GRUNDY IL COCORAHS
STORM TOTAL SO FAR.
1027 AM HEAVY RAIN LANSING 41.57N 87.54W
07/19/2020 M1.77 INCH COOK IL CO-OP OBSERVER
1125 AM HEAVY RAIN 1.3 SE LOCKPORT 41.58N 88.04W
07/19/2020 M1.19 INCH WILL IL COCORAHS
THUNDERSTORM WITH STRONG GUSTY WINDS, VERY
HEAVY RAINFALL, OFTEN BLOWING HORIZONTAL SO
AMOUNT IN GAUGE IS PROBABLY LESS THAN ACTUAL
RAINFALL AMOUNT.
0812 AM HEAVY RAIN HOMEWOOD 41.56N 87.66W
07/19/2020 M1.08 INCH COOK IL COCORAHS
RAIN FELL IN 27 MINUTES.
0938 AM HEAVY RAIN 4.7 ENE MANHATTAN 41.45N 87.90W
07/19/2020 M1.02 INCH WILL IL COCORAHS
RAIN FELL IN 60 MINUTES.
1130 AM HEAVY RAIN 3 ESE PLAINFIELD 41.59N 88.15W
07/19/2020 M0.94 INCH WILL IL COCORAHS
RAIN FELL IN LAST 30 MINUTES.
1202 PM TSTM WND DMG 4 W RENSSELAER 40.94N 87.23W
07/19/2020 JASPER IN LAW ENFORCEMENT
TREE BLOWN ONTO HOUSE.
1157 AM TSTM WND DMG REMINGTON 40.77N 87.15W
07/19/2020 JASPER IN PUBLIC
LARGE LIMBS DOWN IN REMINGTON. REPORTED BY
COCORAHS OBSERVER. TIME ESTIMATED BY RADAR.
1150 AM TSTM WND DMG LAKEVIEW - CHICAGO 41.94N 87.66W
07/19/2020 COOK IL PUBLIC
PORTION OF LARGE TREE DOWNED ONTO ROAD.
1145 AM TSTM WND DMG LAKEVIEW - CHICAGO 41.94N 87.65W
07/19/2020 COOK IL PUBLIC
6-8 TREE BRANCH DOWN NEAR PARKED CARS. TIME
ESTIMATED FROM RADAR. REPORT FROM SOCIAL
MEDIA.
1144 AM TSTM WND DMG 1 SSE CHICAGO LOOP 41.87N 87.62W
07/19/2020 COOK IL BROADCAST MEDIA
REPORTS OF LARGE TREE LIMBS AND NUMEROUS
SMALLER LIMBS DOWN ALONG BALBO AND MICHIGAN
AVENUE. TIME ESTIMATED BASED ON RADAR.
1142 AM TSTM WND DMG 1 ESE OAK LAWN 41.71N 87.73W
07/19/2020 COOK IL LAW ENFORCEMENT
A TREE AND WIRES DOWN ON KOSTNER AVE AROUND
99TH ST. TIME ESTIMATED PER RADAR.
1140 AM TSTM WND DMG OAK PARK 41.88N 87.78W
07/19/2020 COOK IL PUBLIC
VERY LARGE TREE LIMB DOWN IN A BACKYARD.
SOCIAL MEDIA REPORT. TIME ESTIMATED FROM
RADAR.
1135 AM TSTM WND DMG FOREST PARK 41.87N 87.82W
07/19/2020 COOK IL PUBLIC
A FEW TREES DOWNED IN FOREST PARK. TIME
ESTIMATED BY RADAR.
1135 AM TSTM WND DMG 1 ENE SUMMIT 41.79N 87.80W
07/19/2020 COOK IL PUBLIC
LOST A MASSIVE BRANCH ON A TREE AT ST.
JOSEPH CHURCH IN SUMMIT. A FEW OTHER TREES
LOST SMALLER LIMBS DOWN THE BLOCK, TOO.
REPORT VIA SOCIAL MEDIA. TIME ESTIMATED VIA
RADAR.
1120 AM TSTM WND DMG PALOS HEIGHTS 41.68N 87.80W
07/19/2020 COOK IL PUBLIC
LARGE TREE UPROOTED. TIME ESTIMATED BY
RADAR.
1120 AM TSTM WND DMG PEOTONE 41.33N 87.79W
07/19/2020 WILL IL PUBLIC
ROTTEN TREE DOWN ON A HOUSE -- 100 BLK OF
WEST STREET IN PEOTONE. VIA SOCIAL MEDIA.
TIME ESTIMATED BY RADAR.
1119 AM TSTM WND DMG LOCKPORT 41.58N 88.06W
07/19/2020 WILL IL PUBLIC
TRANSFORMER BLOWN DOWN FROM POWER POLE
REPORTED AT DIVISION & HAMILTON ST.
1119 AM TSTM WND DMG 1 NW DOWNERS GROVE 41.80N 88.02W
07/19/2020 DUPAGE IL PUBLIC
FENCE BLOWN DOWN BY STRONG WINDS. TIME
ESTIMATED BY RADAR.
1117 AM TSTM WND DMG HOMER GLEN 41.60N 87.94W
07/19/2020 WILL IL PUBLIC
LARGE TREE SNAPPED. TIME ESTIMATED BY RADAR.
1117 AM TSTM WND DMG 2 S LISLE 41.77N 88.07W
07/19/2020 DUPAGE IL PUBLIC
LARGE BRANCH DOWNED. TIME ESTIMATED.
1116 AM TSTM WND DMG NEW LENOX 41.51N 87.96W
07/19/2020 WILL IL PUBLIC
TREE DOWN ON ROUTE 30 IN NEW LENOX. TIME
ESTIMATED BY RADAR.
1115 AM TSTM WND DMG LOCKPORT 41.58N 88.06W
07/19/2020 WILL IL PUBLIC
LARGE TREE DOWN ON A POWER LINE ON A POWER
POLE NEAR DIVISION AND HAMILTON. REPORT VIA
SOCIAL MEDIA.
1108 AM TSTM WND DMG CHANNAHON 41.43N 88.23W
07/19/2020 WILL IL PUBLIC
MULTIPLE MEDIUM SIZED BRANCHES DOWNED, UP TO
SIX INCHES IN DIAMETER. TIME ESTIMATED PER
RADAR.
1105 AM TSTM WND DMG OSWEGO 41.67N 88.36W
07/19/2020 KENDALL IL PUBLIC
3-6 DIAMETER TREE BRANCH DOWN. REPORT VIA
SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
1104 AM TSTM WND DMG 1 WNW BOULDER HILL 41.72N 88.35W
07/19/2020 KENDALL IL 911 CALL CENTER
LARGE TREE DOWN COMPLETELY BLOCKING THE
ROADWAY. RELAYED BY KENDALL COUNTY DISPATCH.
TIME ESTIMATED BASED ON RADAR.
1057 AM TSTM WND DMG COAL CITY 41.29N 88.28W
07/19/2020 GRUNDY IL PUBLIC
SEVERAL TREES AND TREE LIMBS DOWNED IN COAL
CITY. TIME ESTIMATED BY RADAR.
1056 AM TSTM WND DMG CARBON HILL 41.29N 88.30W
07/19/2020 GRUNDY IL 911 CALL CENTER
TREES AND POWERLINES DOWN. RELAYED BY GRUNDY
COUNTY SO. TIME ESTIMATED BASED ON RADAR.
1050 AM TSTM WND DMG MORRIS 41.36N 88.42W
07/19/2020 GRUNDY IL 911 CALL CENTER
POWERLINES DOWN ACROSS THE BOAT LAUNCH AT
STRATTON PARK. RELAYED BY GRUNDY COUNTY SO.
TIME ESTIMATED BASED ON RADAR.
1048 AM TSTM WND DMG MORRIS 41.36N 88.42W
07/19/2020 GRUNDY IL 911 CALL CENTER
TREES AND POWERLINES DOWN. RELAYED BY GRUNDY
COUNTY SO. TIME ESTIMATED BASED ON RADAR.
1045 AM TSTM WND DMG PONTIAC 40.88N 88.63W
07/19/2020 LIVINGSTON IL LAW ENFORCEMENT
LARGE TREE DOWN; KNOCKED DOWN POWER LINES;
REQUIRED CREWS TO REMOVE.
1040 AM TSTM WND DMG RANSOM 41.16N 88.65W
07/19/2020 LA SALLE IL PUBLIC
TREE DOWNED ONTO POWER LINES. TIME ESTIMATED
BY RADAR.
1031 AM TSTM WND DMG MARSEILLES 41.33N 88.71W
07/19/2020 LA SALLE IL PUBLIC
SEVERAL LARGE TREE LIMBS DOWNED. ALSO MINOR
STREET FLOODING. TIME ESTIMATED BY RADAR.
1023 AM TSTM WND DMG MENDOTA 41.54N 89.12W
07/19/2020 LA SALLE IL PUBLIC
NUMEROUS TREE LIMBS DOWN ON THE SOUTH SIDE
OF MENDOTA. TIME ESTIMATED BY RADAR. RELAYED
VIA NWS EMPLOYEE.
&& $$
Rain Reports
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| Radar-estimated rainfall amounts showing the swath of locally heavy rainfall from across parts of La Salle, Grundy, Will, and southern Cook Counties. |
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 103 PM CDT MON JUL 20 2020 ...PRECIPITATION REPORTS... LOCATION AMOUNT PROVIDER ...ILLINOIS... ...COOK COUNTY... FLOSSMOOR 1 SE 3.03 IN COCORAHS HOMEWOOD 2.93 IN COCORAHS FLOSSMOOR 1 SSW 2.66 IN COCORAHS OAK FOREST 1 NNW 2.00 IN COCORAHS PARK FOREST 1 NNE 1.47 IN COCORAHS PARK FOREST 1.46 IN COOP PARK FOREST 1 WNW 1.37 IN COCORAHS MIDLOTHIAN 1.22 IN COCORAHS MIDLOTHIAN 1 SSE 1.20 IN COCORAHS MIDWAY 3 SW COOP 1.03 IN COOP BRIDGEVIEW 1 WNW 0.99 IN COCORAHS OAK LAWN 0.94 IN COCORAHS PALOS PARK 2 WSW 0.88 IN COCORAHS PALOS PARK 4 W 0.84 IN COCORAHS ALSIP 2 NNE 0.82 IN COCORAHS BURBANK 1 SSW 0.81 IN COCORAHS CHICAGO RIDGE 0.77 IN COCORAHS CHICAGO - HYDE PARK 0.77 IN COCORAHS MIDWAY 3 SW 0.76 IN COOP ...DUPAGE COUNTY... WOODRIDGE 2 S 0.93 IN COCORAHS NAPERVILLE 3 SE 0.77 IN COCORAHS 1 S DARIEN 0.75 IN COCORAHS DARIEN 2 SE 0.70 IN COCORAHS CLARENDON HILLS 0.67 IN UCOOP AURORA 4 ESE 0.67 IN COCORAHS LISLE 2 SW 0.57 IN COCORAHS AURORA 4 ESE 0.56 IN COCORAHS NAPERVILLE 0.55 IN COCORAHS LISLE 1 WSW 0.52 IN COCORAHS ...FORD COUNTY... MELVIN 4 WSW 0.57 IN COCORAHS ...GRUNDY COUNTY... MORRIS 2 SSE 3.17 IN COCORAHS CARBON HILL 3 N 3.02 IN COCORAHS CARBON HILL 3 NW 2.90 IN COCORAHS CARBON HILL 3 NE 2.81 IN COCORAHS MORRIS 2 W 2.77 IN COCORAHS CARBON HILL 3 NNW 2.71 IN COCORAHS MORRIS 1 NW 2.33 IN COOP DWIGHT 4 NNW 1.73 IN COCORAHS COAL CITY 1.19 IN COCORAHS MINOOKA 1.04 IN COCORAHS LISBON 5 S 0.71 IN COCORAHS ...IROQUOIS COUNTY... BUCKLEY 0.88 IN COCORAHS ASHKUM 6 E 0.82 IN COCORAHS CHEBANSE 2 WSW 0.56 IN COCORAHS ...KANE COUNTY... AURORA 2 W 0.63 IN COCORAHS ...KANKAKEE COUNTY... CHEBANSE 0.55 IN COCORAHS CHEBANSE 1 ENE 0.53 IN COCORAHS ST. ANNE 3 NNE 0.52 IN COCORAHS ...KENDALL COUNTY... PLAINFIELD 4 SW 1.20 IN COCORAHS OSWEGO 4 SE 0.61 IN COCORAHS BOULDER HILL 1 NNE 0.60 IN COCORAHS ...LA SALLE COUNTY... OTTAWA 1.18 IN COCORAHS OTTAWA - BUFFALO ROCK SP 1.14 IN COOP OTTAWA 1 N 0.90 IN COCORAHS MARSEILLES 3 W 0.87 IN COOP PERU 1 NNE 0.79 IN COCORAHS MARSEILLES 2 WSW 0.76 IN COCORAHS LA SALLE 0.75 IN COCORAHS TROY GROVE 4 ESE 0.71 IN COCORAHS MENDOTA 0.55 IN COCORAHS ...LIVINGSTON COUNTY... PONTIAC 1 S 0.90 IN COCORAHS EMINGTON 2 SSE 0.85 IN COCORAHS CHATSWORTH 1 S 0.72 IN COCORAHS DWIGHT 0.57 IN COOP CHATSWORTH 0.50 IN COOP ...WILL COUNTY... NEW LENOX 1 SE 2.88 IN COCORAHS NEW LENOX 1 SSE 2.78 IN COCORAHS NEW LENOX 2 SW 2.75 IN COCORAHS CHANNAHON 3 SE 2.70 IN COCORAHS NEW LENOX 2 NE 2.52 IN COCORAHS MOKENA 2 WSW 2.49 IN COCORAHS MANHATTAN 3 NW 2.46 IN COCORAHS FRANKFORT 4 SW 1.62 IN COCORAHS MANHATTAN 5 ENE 1.60 IN COOP MANHATTAN 1 E 1.50 IN COCORAHS MANHATTAN 2 SE 1.45 IN COCORAHS CHANNAHON 1 NE 1.45 IN COCORAHS WILMINGTON 1.41 IN COCORAHS LOCKPORT 2 SE 1.37 IN COCORAHS MONEE 5 W 1.37 IN COCORAHS JOLIET 2 N 1.31 IN UCOOP UNIVERSITY PARK 1 ENE 1.26 IN COCORAHS LAKEWOOD SHORES 1 SE 1.23 IN COCORAHS PLAINFIELD 2 SSE 1.22 IN COCORAHS SAUK VILLAGE 2 SSE 1.21 IN COCORAHS CRYSTAL LAWNS 2 N 0.94 IN COCORAHS PLAINFIELD 3 SSW 0.94 IN COCORAHS ROMEOVILLE 3 NW 0.90 IN COCORAHS ROMEOVILLE - NWS CHICAGO 0.85 IN COOP SAUK VILLAGE 3 S 0.82 IN COCORAHS PLAINFIELD 4 NNW 0.78 IN COCORAHS HOMER GLEN 3 S 0.76 IN COCORAHS HOMER GLEN 2 NNE 0.75 IN COCORAHS NAPERVILLE 5 SSW 0.74 IN COCORAHS HOMER GLEN 1 NNE 0.74 IN COCORAHS MOKENA 1 W 0.70 IN COCORAHS BOLINGBROOK 2 NW 0.67 IN COCORAHS NAPERVILLE 4 SSW 0.58 IN COCORAHS ...INDIANA... ...JASPER COUNTY... REMINGTON 0.75 IN COCORAHS RENSSELAER 2 N 0.51 IN COCORAHS ...LAKE COUNTY... GRIFFITH 1.94 IN COCORAHS DYER 1.93 IN COCORAHS HIGHLAND 1 SW 1.81 IN COCORAHS GRIFFITH 1.80 IN COCORAHS HAMMOND 1 SSW 1.56 IN COCORAHS HAMMOND 2 N 1.55 IN COCORAHS HOBART 1 SW 1.44 IN COCORAHS SCHERERVILLE 1 E 1.40 IN COCORAHS SCHERERVILLE 1 E 1.19 IN COCORAHS ST. JOHN 0.86 IN COCORAHS LAKE STATION 3 NNW 0.79 IN COCORAHS CROWN POINT 2 NNE 0.52 IN COCORAHS CROWN POINT 0.52 IN COOP ...NEWTON COUNTY... MOROCCO 0.62 IN COOP KENTLAND 0.56 IN COCORAHS ...PORTER COUNTY... VALPARAISO 2 NE 0.82 IN COCORAHS VALPARAISO 4 SW 0.78 IN COCORAHS BURNS HARBOR 1 S 0.76 IN COCORAHS VALPARAISO 2.6 WNW 0.75 IN COCORAHS VALPARAISO 2 NW 0.74 IN COCORAHS VALPARAISO 2 NNE 0.72 IN COCORAHS VALPARAISO 2 NNW 0.71 IN COCORAHS OGDEN DUNES 0.64 IN COCORAHS CHESTERTON 4 ESE 0.57 IN COCORAHS WANATAH 0.55 IN COOP LAKES OF THE FOUR SEASONS 0.54 IN COCORAHS BOONE GROVE 4 NNE 0.50 IN COCORAHS OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING EQUIPMENT AND EXPOSURES. WE THANK ALL VOLUNTEER WEATHER OBSERVERS FOR THEIR DEDICATION. NOT ALL DATA LISTED ARE CONSIDERED OFFICIAL. $$
Environmental Conditions
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| 7 AM Upper Air Sounding from Davenport, Iowa showing very high instability values, especially for the early time of day (MUCAPE of 4887 J/kg). | 500 mb (~20,000 ft) analysis at 11 AM showing a modestly strong 40-50 kt mid-level jet overhead. | 700 mb (~10,000 ft) analysis at 11 AM showing that these strong winds extend down into the low-mid storm level, helping to support fast storm motions. Dry air can be see to the west, which may have also aided in the development of a strong "Rear Inflow Jet." |
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| 11 AM analysis of MUCAPE (Most Unstable Convective Available Potential Energy). Values of 2500-3500 J/kg are present, supporting of robust thunderstorm development. | Effective deep layer shear values are modestly high around 30-35 kts, supportive of storm organization. | 11 AM radar snapshot showing the area of intense thunderstorm activity in a "bow echo" shape moving quickly eastward along I-80. |
Additional Info
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Media use of NWS Web News Stories is encouraged! Please acknowledge the NWS as the source of any news information accessed from this site. Additional recaps can be found on the NWS Chicago Past Events Page |
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