Severe Thunderstorm Warning 80, NWS Chicago, IL

572 
WWUS53 KLOT 240121
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
821 PM CDT SAT JUL 23 2016

ILC103-141-240200-
/O.CON.KLOT.SV.W.0080.000000T0000Z-160724T0200Z/
OGLE IL-LEE IL-
821 PM CDT SAT JUL 23 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR OGLE AND CENTRAL LEE COUNTIES...

AT 820 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 5 MILES SOUTH OF BYRON TO 5 MILES NORTHWEST
OF AMBOY...MOVING EAST AT 30 MPH. 

HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
DIXON...ROCHELLE...OREGON...MOUNT MORRIS...BYRON...AMBOY...HILLCREST...
STILLMAN VALLEY...FRANKLIN GROVE...ASHTON...PAW PAW...DAVIS JUNCTION...
CRESTON...LEAF RIVER...LEE...COMPTON...STEWARD...WEST BROOKLYN AND
ADELINE.

THIS INCLUDES...  CASTLE ROCK STATE PARK...LEE COUNTY FAIRGROUNDS...
LOWDEN STATE PARK...OGLE COUNTY FAIRGROUNDS...AND WHITE PINES STATE
PARK.
 
INCLUDING THE FOLLOWING INTERSTATES...
 I-39 BETWEEN MILE MARKERS 80 AND 114.
 I-88 BETWEEN MILE MARKERS 51 AND 82.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

INTENSE THUNDERSTORM LINES CAN PRODUCE BRIEF TORNADOES AND WIDESPREAD
SIGNIFICANT WIND DAMAGE. ALTHOUGH A TORNADO IS NOT IMMEDIATELY
LIKELY...IT IS BEST TO MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF A BUILDING. THESE STORMS MAY CAUSE SERIOUS INJURY AND SIGNIFICANT
PROPERTY DAMAGE.

DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING
WITH THESE STORMS. MOVE INDOORS IMMEDIATELY. 

LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4217 8954 4216 8917 4215 8917 4215 8894
      4163 8894 4177 8953
TIME...MOT...LOC 0120Z 287DEG 26KT 4207 8924 4189 8931 4173 8936 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

RC

392 
WWUS53 KLOT 240137
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
837 PM CDT SAT JUL 23 2016

ILC103-141-240200-
/O.CON.KLOT.SV.W.0080.000000T0000Z-160724T0200Z/
OGLE IL-LEE IL-
837 PM CDT SAT JUL 23 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR EASTERN OGLE AND NORTHEASTERN LEE COUNTIES...

AT 836 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 5 MILES EAST OF STILLMAN VALLEY TO NEAR ASHTON TO 5
MILES EAST OF AMBOY...MOVING EAST AT 35 MPH. LAW ENFORCEMENT
REPORTED MULTIPLE POWER LINES DOWNED IN DIXON WITH THESE STORMS.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...LAW ENFORCEMENT. 

IMPACT...EXPECT WIND DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
ROCHELLE...OREGON...BYRON...AMBOY...HILLCREST...STILLMAN VALLEY...FRANKLIN
GROVE...ASHTON...PAW PAW...DAVIS JUNCTION...CRESTON...LEE...COMPTON...
STEWARD AND WEST BROOKLYN.

THIS INCLUDES...  LEE COUNTY FAIRGROUNDS...LOWDEN STATE PARK...AND OGLE
COUNTY FAIRGROUNDS.
 
INCLUDING THE FOLLOWING INTERSTATES...
 I-39 BETWEEN MILE MARKERS 80 AND 114.
 I-88 BETWEEN MILE MARKERS 57 AND 82.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING
WITH THESE STORMS. MOVE INDOORS IMMEDIATELY. LIGHTNING IS ONE OF
NATURES LEADING KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4216 8933 4216 8917 4215 8917 4215 8894
      4163 8894 4175 8944
TIME...MOT...LOC 0136Z 285DEG 30KT 4207 8904 4186 8915 4170 8922 

HAIL...1.00IN
WIND...60MPH
 
$$

RC

209 
WWUS53 KLOT 240200
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
900 PM CDT SAT JUL 23 2016

ILC103-141-240209-
/O.EXP.KLOT.SV.W.0080.000000T0000Z-160724T0200Z/
OGLE IL-LEE IL-
900 PM CDT SAT JUL 23 2016

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OGLE AND NORTHEASTERN
LEE COUNTIES WILL EXPIRE AT 900 PM CDT...
    
THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE CENTRAL
PORTIONS OF THESE COUNTIES. THEREFORE THE WARNING WILL BE ALLOWED TO
EXPIRE. 

REMEMBER...ANOTHER SEVERE THUNDERSTORM WARNING STILL REMAINS IN
EFFECT FOR SOUTHEAST OGLE AND EASTERN LEE COUNTIES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
NORTH CENTRAL ILLINOIS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
CHICAGO .

LAT...LON 4216 8933 4216 8917 4215 8917 4215 8894
      4163 8894 4175 8944
TIME...MOT...LOC 0158Z 286DEG 30KT 4207 8904 4186 8915 4170 8922 

$$

RC

Area Forecast Discussion...UPDATED
National Weather Service Chicago/Romeoville, IL
751 PM CDT SAT JUL 23 2016

.MESOSCALE DISCUSSION...
749 PM CDT

Attention shifting to the storms moving eastward into north
central Illinois. Nature of these storms is slowly starting to
re-intensify, namely the area moving into western Ogle and Lee
Counties. Seeing some organization for a wind threat with signs of
a localized MCV in Carroll County and a rear-inflow jet to its
immediate south, with a developing wind threat to its south and
isolated severe cores ahead of it. The 00Z DVN sounding indicated
3700 J/kg of MLCAPE and over 40 kt of deep layer shear, supporting
severe storm potential to continue. Severe winds and heavy rain
will continue to be the primary threats. The outflow boundary does
drape back to the northwest into the leading edge of these storms
near the Ogle/Lee border and could be a focus for a localized
tornado threat, especially given the 0-1km helicity of nearly 200
m2/s2 on the 00Z DVN sounding. Will need to watch this closely.

MTF

&&

.SHORT TERM...
347 PM CDT

Through Sunday...

A Severe Thunderstorm Watch has been issued for northern Illinois,
generally along and north of I-80, through 10 pm this evening. No
changes made to the heat headline or any issuance for Sunday due
to uncertainty and residual effects of nighttime convection.

Convective cluster in northeast Iowa has raised concerns as cloud
tops have rapidly cooled and is further showing signs of
organization. Mesoscale convective vortex (MCV) across central
Iowa is likely the driving feature and has become more clear this
afternoon on satellite with mid-level speed max supporting
effective shear of 35 to 50 kt. Also there is support for a cold
pool to develop and grow. The effective surface front and
instability gradient, affected by outflow from storms to the
north, is draped across far northeast Iowa and far near/just south
of the WI/IL state border. This likely would be the path that
organized storms would travel eastward, though propagation would
indicate a slight south of eastward movement too.

There is high uncertainty on just how organized these storms will
become as well as how far south this evening. There is capping in
place the further south into the area and the storms are
immediately moving into somewhat worked over air due east of
them. But given the degree of instability (MLCAPES of 3500 to 5000
J/kg) and moisture (PWATS around 2 inches) over a large part of
the DVN CWA and ours, at least some convective cluster(s) are
likely to make it into our area. The best timing estimate of these
reaching the Rockford area appears to be around 7 pm and the
Chicago area 830 to 11 pm. Again this is assuming the storms have
some form or organization.

The primary hazards with these evening storms would be pockets of
severe winds due to high downdraft CAPES and precipitation
loading, especially any more organized activity. Near the outflow
boundary there may be a localized tornado threat due to backed
low-level wind flow, and the boundary layer is quite moist for
maintaining low-level instability into the evening. Storm motion
could be fairly slow especially anything that develops ahead of
the main cluster(s) and would be of greatest concern for localized
flooding.

There is now naturally less confidence on late night/daybreak
Sunday storms but maintaining likely in northern areas where
vort max is pegged to move eastward across Wisconsin and the low-
level jet points over our area. The less organized evening storms
are the more likelihood of overnight storms and that they could
bring a marginal severe weather risk.

For Sunday, high dew points in the mid to upper 70s are expected.
The thermal ridge immediately ahead of the cold front will support
mid 90s for highs if we can clear and have full heating. There is
high uncertainty of this so that is why no heat advisory at this
time. One may be needed for a large portion of the CWA, including
Chicago, if the going forecast continues. The front itself will
probably spark scattered storms although how much coverage will
likely be impacted by how storms behave tonight.

MTF

&&

.LONG TERM...
213 PM CDT

Sunday night through Saturday...

Sunday evening through Monday...The upper trough currently moving
east across southern Saskatchewan will swing across
western/central Ontario Sunday night and Monday. The associated
cool front will be dropping southward across the southern half or
so of the local area Sunday evening. Will continue with chance
pops Sunday evening/night across the south to southeast half of
the area as the front will be slow to progress and there is a
decent chance of an embedded shortwave moving through the main
upper flow. Some activity may linger Monday morning across the far
southern counties but surface high pressure will be quick to build
in bringing drier air with it. 850 mb temps cool to 16-17C Monday
with abundant sunshine expected once any lingering clouds clear
south. This supports highs in the mid to upper 80s but onshore
flow will develop near Lake Michigan keeping areas within a few
miles of the lake in the lower 80s. Lows Monday night will fall
into the mid 60s with upper 60s/around 70 in the Chicago Metro.
High pressure will be overhead Tuesday and shift to the east
Tuesday night. High temps will be similar to Monday with
continued cooling near Lake Michigan.

Wednesday through Saturday...The generally zonal upper flow
of Monday and Tuesday will buckle a bit mid week with medium
range guidance suggesting a more pronounced larger scale trough
developing into and over the weekend. Until then...the surface
pattern is fairly ill-defined through Wednesday but the upper
flow patter supports the passage of embedded shortwaves. This will
probably lead to transient shower/storm chances Wednesday and
Thursday. A more coherent surface low may move across Thursday
with a stronger upper wave noted in guidance but this has not
been the most consistent feature. Guidance is in decent agreement
on a well defined upper trough crossing the area sometime Friday
or Saturday which will bring a more organized chance for storms
but the timing is not clear at this range. Low/mid level temps do
not fluctuate much through late week. Cloud cover may be rather
persistent from Wednesday onward with any convection also working
to hold temps down some as well. Will continue with highs in the
lower to mid 80s...but may end up being warmer if convection is
kept to a minimum.

MDB

&&

.AVIATION...
For the 00Z TAFs...

655 pm...Current thunderstorms over northeast IL will continue to
move southeast over the next few hours. Expect a short lull before
the line of thunderstorms west of rfd to north of quad cities
moves east. Current timing in the tafs might be a tad early but
expect these storms to impact rfd shortly at northeast Il
terminals by/around 02z with some uncertainty regarding the
southern extent of these storms though there could continue to be
southeast development. Once these storms pass the area by late
evening...trends would suggest the overnight hours being quiet/dry
but confidence is low. Changed prevailing thunder after sunrise to
vicinity with this forecast and this time period may end up being
dry.

Additional thunderstorm development is expected Sunday afternoon
into Sunday evening ahead of an approaching cold front. Timing has
differed from various models but trend now appears later and
maintained vicinity mention for now.

Northerly winds at the Chicago area terminals with current
activity will likely diminish to a light easterly ahead of the
next round of thunderstorms which are expected to have an outflow
shifting winds back westerly. Winds will settle to light southerly
later this evening and overnight with gusty south/southwest winds
expected Sunday. cms

&&

.MARINE...
213 PM CDT

Light and variable winds will transition to a steadier but still
fairly light south to southeast direction this evening and
tonight. Surface low pressure over southern Saskatchewan this
afternoon will track into western Ontario by Sunday afternoon.
This will bring a steady south to southwest breeze across the lake
by daybreak or so Sunday and persist through the afternoon. Gusts
near 20 kt are likely across the IL/IN nearshore but not expecting
small craft advisory thresholds being met at this time. A cool
frontal boundary will move east- southeast across the lake late
Sunday afternoon and Sunday evening shifting winds to the west and
eventually northwest by late Sunday evening. Thunderstorms will
become likely across much of the lake by late evening ahead of the
advancing front...then diminish in coverage from northwest to
southeast Sunday.

Wind speeds will diminish into Monday afternoon. High pressure
will spread in from the west so winds may end up coming onshore
around the lake later Monday afternoon. Light onshore flow is more
likely Tuesday with high pressure pretty much overhead. The
surface pattern becomes more ill-defined Wednesday into the
weekend keeping wind speeds generally light with erratic direction
at times...especially Wednesday and Thursday. A more persistent
north to northeast direction is favored into the weekend.
Thunderstorm chances increase again Wednesday through Saturday and
may substantially modify the wind fields depending on how
organized they are.

MDB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSCHICAGO
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
406 PM CDT SAT JUL 23 2016

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
242115-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
406 PM CDT SAT JUL 23 2016 /506 PM EDT SAT JUL 23 2016/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TONIGHT.

WEATHER HAZARDS EXPECTED:
  SIGNIFICANT THUNDERSTORM RISK...WITH AN ASSOCIATED:
      LIMITED HAIL RISK...UP TO HALF DOLLAR SIZE.
      ELEVATED THUNDERSTORM WIND DAMAGE RISK...UP TO 70 MPH.
  LIMITED FLOODING RISK.
  SIGNIFICANT EXCESSIVE HEAT RISK.

DISCUSSION:

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE LATE THIS AFTERNOON
MAINLY ALONG AND NORTH OF INTERSTATE 80. MOST STORMS WILL BE SLOW
MOVING AND THUS CAPABLE OF HEAVY RAINFALL AND LOCALIZED FLOODING.
IN ADDITION...THERE WILL BE A BRIEF GUSTY WIND THREAT WITH ANY STORMS.

A MORE ORGANIZED AREA OF THUNDERSTORMS WILL MOVE IN FROM EASTERN IOWA
THIS EVENING AND IMPACT AREAS ALONG AND NORTH OF INTERSTATE 80. DAMAGING
WINDS...TORRENTIAL DOWNPOURS AND LIGHTNING WILL BE THE MAIN THREATS. A
MINIMAL TORNADO THREAT EXISTS NEAR THE WISCONSIN BORDER.

ADDITIONAL THUNDERSTORMS ARE POSSIBLE OVERNIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

SUNDAY...
  LIMITED FLOODING RISK.
  LIMITED SEVERE THUNDERSTORM RISK.
  SIGNIFICANT EXCESSIVE HEAT RISK.
MONDAY...
  LIMITED THUNDERSTORM RISK.
WEDNESDAY THROUGH FRIDAY...
  LIMITED THUNDERSTORM RISK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER REPORTS WILL LIKELY BE NEEDED THROUGH TONIGHT.

GENERAL STORM MOTION OF THE DAY:

MOVING TOWARD THE EAST AT 10 MPH THIS AFTERNOON AND THEN TO THE SOUTHEAST
AT 20 TO 30 MPH THIS EVENING AND TONIGHT.

&&

LMZ740>745-242115-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
406 PM CDT SAT JUL 23 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

ISOLATED THUNDERSTORMS ARE EXPECTED THROUGH LATE AFTERNOON WITH MORE
ORGANIZED THUNDERSTORMS EXPECTED THIS EVENING. ADDITIONAL STORMS ARE POSSIBLE
OVERNIGHT. STORMS MAY PRODUCE WIND GUSTS IN EXCESS OF 34 KT...WITH ISOLATED
STORMS PRODUCING GUSTS IN EXCESS OF 50 KT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE ARE PERIODIC CHANCES FOR THUNDERSTORMS SUNDAY...AND AGAIN
WEDNESDAY THROUGH FRIDAY.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-242115-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
406 PM CDT SAT JUL 23 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS LATE THIS AFTERNOON WITH
THUNDERSTORMS THIS EVENING AND OVERNIGHT. STORMS MAY PRODUCE WIND
GUSTS IN EXCESS OF 34 KT...WITH ISOLATED STORMS PRODUCING GUSTS IN EXCESS
OF 50 KT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY...AND THEN AGAIN
TUESDAY NIGHT THROUGH FRIDAY.

&&

MDB

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSCHICAGO
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
728 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0700 PM     HEAVY RAIN       ELMWOOD PARK            41.92N 87.82W
07/23/2016  M0.93 INCH       COOK               IL   AMATEUR RADIO

            0.93 INCHES IN 40 MINUTES.

&&

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
739 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0626 PM     TSTM WND DMG     EAST DUNDEE             42.10N 88.26W
07/23/2016                   KANE               IL   LAW ENFORCEMENT

            BRANCHES DOWN AT ROUTE 25 AND SUNSET PARK.

&&

MDB

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
741 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0450 PM     HAIL             BELVIDERE               42.25N 88.85W
07/23/2016  E0.25 INCH       BOONE              IL   TRAINED SPOTTER

            VERY HEAVY RAINFALL...VISIBILITY AROUND 1/2 MILE. LOTS OF
            CLOUD TO GROUND LIGHTNING.

0503 PM     HAIL             ROCKFORD                42.27N 89.06W
07/23/2016  E0.25 INCH       WINNEBAGO          IL   PUBLIC

            PEA SIZE HAIL AT HARRISON AND ALPINE ROADS.

0520 PM     HEAVY RAIN       N CAPRON                42.40N 88.74W
07/23/2016  M2.15 INCH       BOONE              IL   COCORAHS

            2.15 INCHES IN LAST 2.5 HOURS.

0532 PM     HAIL             CHERRY VALLEY           42.24N 88.96W
07/23/2016  E1.00 INCH       WINNEBAGO          IL   TRAINED SPOTTER

            ALSO 55 TO 60 MPH WINDS AND VERY HEAVY RAINFALL WITH
            VISIBILITY AROUND 200 FEET.

0537 PM     FLOOD            MARENGO                 42.25N 88.60W
07/23/2016                   MCHENRY            IL   AMATEUR RADIO

            FOUR INCHES OF STANDING WATER ON ROUTE 20.

0544 PM     FLOOD            BELVIDERE               42.25N 88.85W
07/23/2016                   BOONE              IL   TRAINED SPOTTER

            3 TO 4 INCHES OF WATER IN MANY PARKING LOTS ALONG U.S.
            20. WATER FILLING MANY DRAINAGE DITCHES.

0545 PM     HEAVY RAIN       GURNEE                  42.38N 87.94W
07/23/2016  M2.30 INCH       LAKE               IL   BROADCAST MEDIA

            2.30 INCHES IN 45 MINUTES.

0555 PM     MARINE TSTM WIND 6 E GLENCOE             42.13N 87.65W
07/23/2016  M51.00 MPH       LMZ740             IL   BUOY

            TIME ESTIMATED BY RADAR.

0600 PM     HEAVY RAIN       4 SSE ROCKFORD          42.22N 89.04W
07/23/2016  M2.41 INCH       WINNEBAGO          IL   COCORAHS

            PAST 75 MINUTES

0605 PM     HEAVY RAIN       3 NNW LAKE FOREST       42.28N 87.88W
07/23/2016  M1.52 INCH       LAKE               IL   COCORAHS

            PAST 48 MINUTES.

0608 PM     HEAVY RAIN       1 NE BELVIDERE          42.26N 88.83W
07/23/2016  M2.97 INCH       BOONE              IL   COCORAHS

            2.97 INCHES OF RAIN OVER PAST 2.5 HOURS.

0610 PM     HEAVY RAIN       HIGHLAND PARK           42.18N 87.81W
07/23/2016  M1.75 INCH       LAKE               IL   TRAINED SPOTTER

            MEASURED 1 HOUR RAINFALL.

0611 PM     FLOOD            CHERRY VALLEY           42.24N 88.96W
07/23/2016                   WINNEBAGO          IL   TRAINED SPOTTER

            ROAD FLOODED WITH MULTIPLE VEHICLES STRANDED/FLOODED.
            I-39 AND US ROUTE 20.

0615 PM     TSTM WND DMG     EVANSTON                42.05N 87.69W
07/23/2016                   COOK               IL   TRAINED SPOTTER

            SEVERAL 6 INCH DIAMETER BRANCHES DOWN.

0625 PM     FLOOD            EVANSTON                42.05N 87.69W
07/23/2016                   COOK               IL   TRAINED SPOTTER

            3 TO 4 INCHES OF WATER ON A FEW ROADS.

0626 PM     TSTM WND DMG     EAST DUNDEE             42.10N 88.26W
07/23/2016                   KANE               IL   LAW ENFORCEMENT

            BRANCHES DOWN AT ROUTE 25 AND SUNSET PARK.

0628 PM     TSTM WND GST     SKOKIE                  42.04N 87.74W
07/23/2016  E60.00 MPH       COOK               IL   AMATEUR RADIO

            WIND ESTIMATED AT 55-60 MPH. DEMPSTER STREET WEST OF
            SKOKIE BLVD.

0632 PM     MARINE TSTM WIND 2 SSE CHICAGO           41.86N 87.61W
07/23/2016  M56.00 MPH       COOK               IL   C-MAN STATION

0700 PM     HEAVY RAIN       MOUNT PROSPECT          42.07N 87.94W
07/23/2016  M0.93 INCH       COOK               IL   AMATEUR RADIO

            0.93 INCHES IN 40 MINUTES FROM 620 PM TO 700 PM CDT.

0700 PM     FLOOD            HIGHWOOD                42.21N 87.81W
07/23/2016                   LAKE               IL   AMATEUR RADIO

            CAR STRANDED IN 2.5 FEET OF WATER AT GREEN BAY ROAD AND
            BURCHELL ROADS.

0700 PM     HEAVY RAIN       ELMWOOD PARK            41.92N 87.82W
07/23/2016  M0.93 INCH       COOK               IL   AMATEUR RADIO

            0.93 INCHES IN 40 MINUTES.

&&

MDB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
750 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     FLOOD            WINNETKA                42.11N 87.74W
07/23/2016                   COOK               IL   AMATEUR RADIO

            VIADUCT FLOODED AT WILSON STREET AND WINNETKA ROAD.

&&

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
752 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0515 PM     TSTM WND DMG     MARENGO                 42.25N 88.60W
07/23/2016                   MCHENRY            IL   LAW ENFORCEMENT

            LARGE TREE BLOWN DOWN. TIME ESTIMATED BY RADAR.

&&

MDB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
753 PM CDT SAT JUL 23 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     FLOOD            CHICAGO                 41.88N 87.63W
07/23/2016                   COOK               IL   AMATEUR RADIO

            VIADUCT FLOODED AT SACRAMENTO AND CARROL. NEAR WEST SIDE.

&&

RATZER