River Flood Warning 6, NWS Chicago, IL

109 
WGUS43 KLOT 270208
FLWLOT

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Chicago IL
908 PM CDT Sat Jun 26 2021

...Forecast flooding changed from Minor to Moderate severity and 
increased in duration for the following rivers in Illinois...

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means water levels above flood stage are imminent or 
may already be occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected by Sunday afternoon.

&&


ILC105-271715-
/O.EXT.KLOT.FL.W.0006.210627T0400Z-210629T2100Z/
/PNTI2.2.ER.210627T0624Z.210628T1200Z.210629T1339Z.NR/
908 PM CDT Sat Jun 26 2021

...Forecast flooding increased from Minor to Moderate severity and 
increased in duration until Tuesday afternoon...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until Tuesday afternoon.
* At 7:45 PM CDT Saturday the stage was 12.9 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is forecast.
* Forecast...The river is expected to rise above flood stage just 
  before midnight tonight to a crest of 17.9 feet Monday morning. It 
  will then fall below flood stage Tuesday morning.
* Impact...At 18.0 feet, Inundation of Humiston-Riverside Park 
  reaches Water Street north of the river in Pontiac. Residences 
  along Mockingbird Lane and Meadowlark Drive are threatened west of 
  Pontiac.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Ogorek

013 
WGUS83 KLOT 271619
FLSLOT

Flood Statement
National Weather Service Chicago IL
1119 AM CDT Sun Jun 27 2021

...The Flood Warning continues for the following rivers in 
Illinois...

  Vermilion River near Leonore affecting La Salle County.

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means water levels above flood stage are possible, but 
not yet certain, based upon the latest forecasts. Persons along 
rivers and streams in the watch area should monitor the latest 
forecasts and be prepared to take action should flooding develop.

A Flood Advisory means water levels near flood stage are imminent or 
may already be occurring. Water may overtop low stream banks in some 
areas. Persons in the advisory area should use caution and avoid 
flood waters.

A Flood Warning means water levels above flood stage are imminent or 
may already occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected around 230 AM CDT late tonight.

&&


ILC099-280730-
/O.EXT.KLOT.FL.W.0010.000000T0000Z-210629T2030Z/
/LNRI2.1.ER.210628T0215Z.210629T0000Z.210629T1430Z.NO/
1119 AM CDT Sun Jun 27 2021

...The Flood Warning is now in effect until Tuesday afternoon...

The Flood Warning continues for
  the Vermilion River near Leonore.
* Until Tuesday afternoon.
* At 10:45 AM CDT Sunday the stage was 14.4 feet.
* Flood stage is 16.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  this evening to a crest of 17.5 feet tomorrow evening. It will 
  then fall below flood stage late Tuesday morning.
* Impact...At 16.0 feet, Water begins to flood low lying 
  agricultural land near river.
* Flood History...This crest compares to a previous crest of 17.3 
  feet on 06/15/1999.


&&

LAT...LON 4131 8912 4132 8899 4113 8880 4109 8889

$$

ILC105-280730-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210629T0830Z/
/PNTI2.2.ER.210627T0430Z.210628T0600Z.210629T0230Z.NO/
1119 AM CDT Sun Jun 27 2021

...The Flood Warning is now in effect until early Tuesday morning...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until late Monday night.
* At 10:45 AM CDT Sunday the stage was 15.1 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 AM CDT Sunday was 15.1 feet.
* Forecast...The river is expected to rise to a crest of 16.5 feet 
  just after midnight tonight. It will then fall below flood stage 
  late tomorrow evening.
* Impact...At 16.5 feet, Low-lying sections of Southside Cemetery 
  are inundated in Pontiac.
* Flood History...This crest compares to a previous crest of 16.6 
  feet on 03/12/1990.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Birk

020 
WGUS83 KLOT 280148
FLSLOT

Flood Statement
National Weather Service Chicago IL
848 PM CDT Sun Jun 27 2021

...The Flood Warning is extended for the following rivers in 
Illinois...

  Vermilion River near Leonore affecting La Salle County.

...The Flood Warning continues for the following rivers in 
Illinois...

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means water levels above flood stage are imminent or 
may already be occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected around 1200 PM CDT Monday afternoon.

&&


ILC099-281700-
/O.EXT.KLOT.FL.W.0010.000000T0000Z-210629T2100Z/
/LNRI2.1.ER.210628T1000Z.210629T0000Z.210629T1500Z.NO/
848 PM CDT Sun Jun 27 2021

...The Flood Warning is now in effect until Tuesday afternoon...

The Flood Warning continues for
  the Vermilion River near Leonore.
* Until Tuesday afternoon.
* At 7:45 PM CDT Sunday the stage was 15.4 feet.
* Flood stage is 16.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late 
  tonight to a crest of 16.5 feet tomorrow evening. It will then 
  fall below flood stage late Tuesday morning.
* Impact...At 16.0 feet, Water begins to flood low lying 
  agricultural land near river.
* Flood History...This crest compares to a previous crest of 16.4 
  feet on 05/28/1982.


&&

LAT...LON 4131 8912 4132 8899 4113 8880 4109 8889

$$

ILC105-281700-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210629T0748Z/
/PNTI2.2.ER.210627T0430Z.210628T0600Z.210629T0148Z.NO/
848 PM CDT Sun Jun 27 2021

...The Flood Warning is now in effect until early Tuesday morning...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until late Monday night.
* At 7:45 PM CDT Sunday the stage was 15.6 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 7:45 PM CDT Sunday was 15.6 feet.
* Forecast...The river is expected to rise to a crest of 15.7 feet 
  just after midnight tonight. It will then fall below flood stage 
  tomorrow evening.
* Impact...At 15.0 feet, Low-lying residences threatened between 
  Mill Street and Chautauqua Park in Pontiac. IL-116 threatened east 
  and west of Pontiac.
* Flood History...This crest compares to a previous crest of 15.7 
  feet on 05/05/1965.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Lenning

474 
WGUS83 KLOT 281623
FLSLOT

Flood Statement
National Weather Service Chicago IL
1123 AM CDT Mon Jun 28 2021

...The Flood Warning is extended for the following rivers in 
Illinois...

  Vermilion River near Leonore affecting La Salle County.

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means water levels above flood stage are possible, but 
not yet certain, based upon the latest forecasts. Persons along 
rivers and streams in the watch area should monitor the latest 
forecasts and be prepared to take action should flooding develop.

A Flood Advisory means water levels near flood stage are imminent or 
may already be occurring. Water may overtop low stream banks in some 
areas. Persons in the advisory area should use caution and avoid 
flood waters.

A Flood Warning means water levels above flood stage are imminent or 
may already occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected around 230 AM CDT late tonight.

&&


ILC099-290730-
/O.EXT.KLOT.FL.W.0010.000000T0000Z-210630T0600Z/
/LNRI2.1.ER.210628T1035Z.210629T0000Z.210630T0000Z.NO/
1123 AM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until early Wednesday 
morning...

The Flood Warning continues for
  the Vermilion River near Leonore.
* Until late Tuesday night.
* At 10:45 AM CDT Monday the stage was 16.3 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 AM CDT Monday was 16.3 feet.
* Forecast...The river is expected to rise to a crest of 16.5 feet 
  this evening. It will then fall below flood stage tomorrow evening.
* Impact...At 16.0 feet, Water begins to flood low lying 
  agricultural land near river.
* Flood History...This crest compares to a previous crest of 16.4 
  feet on 05/28/1982.


&&

LAT...LON 4131 8912 4132 8899 4113 8880 4109 8889

$$

ILC105-290730-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210629T1640Z/
/PNTI2.2.ER.210627T0430Z.210628T0730Z.210629T1040Z.NO/
1123 AM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until late tomorrow morning...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until Tuesday morning.
* At 10:45 AM CDT Monday the stage was 15.7 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 AM CDT Monday was 15.7 feet.
* Forecast...The river is expected to fall below flood stage late 
  tonight and continue falling to 5.1 feet Monday morning.
* Impact...At 15.0 feet, Low-lying residences threatened between 
  Mill Street and Chautauqua Park in Pontiac. IL-116 threatened east 
  and west of Pontiac.
* Flood History...This crest compares to a previous crest of 15.7 
  feet on 05/29/1996.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Birk

952 
WGUS83 KLOT 290257
FLSLOT

Flood Statement
National Weather Service Chicago IL
957 PM CDT Mon Jun 28 2021

...The Flood Warning is extended for the following rivers in 
Illinois...

  Illinois River at La Salle affecting La Salle, Bureau and Putnam 
  Counties.

  Illinois River at Ottawa affecting La Salle County.

  Vermilion River at Pontiac affecting Livingston County.

...The Flood Warning continues for the following rivers in 
Illinois...

  Vermilion River near Leonore affecting La Salle County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

A Flood Warning means water levels above flood stage are imminent or 
may already occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected around 100 PM CDT Tuesday afternoon.

&&


ILC011-099-155-291800-
/O.EXT.KLOT.FL.W.0013.000000T0000Z-210703T2000Z/
/LSLI2.1.ER.210627T1049Z.210629T0600Z.210703T1400Z.NO/
957 PM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until Saturday afternoon...

The Flood Warning continues for
  the Illinois River at La Salle.
* Until Saturday afternoon.
* At 8:45 PM CDT Monday the stage was 23.8 feet.
* Flood stage is 20.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 PM CDT Monday was 23.8 feet.
* Forecast...The river is expected to rise to a crest of 23.9 feet 
  just after midnight tonight. It will then fall below flood stage 
  late Saturday morning.
* Impact...At 22.0 feet, Lower parking lot at Starved Rock State 
  Park is inundated east of La Salle.
* Flood History...This crest compares to a previous crest of 23.9 
  feet on 06/02/2004.


&&

LAT...LON 4131 8940 4135 8933 4137 8898 4128 8899
      4128 8929

$$

ILC099-291800-
/O.EXT.KLOT.FL.W.0012.000000T0000Z-210630T0200Z/
/OTWI2.1.ER.210627T1650Z.210629T0130Z.210629T2000Z.NO/
957 PM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until late tomorrow evening...

The Flood Warning continues for
  the Illinois River at Ottawa.
* Until Tuesday evening.
* At 8:30 PM CDT Monday the stage was 463.6 feet.
* Flood stage is 463.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:30 PM CDT Monday was 463.6 feet.
* Forecast...The river is expected to fall below flood stage 
  tomorrow afternoon and continue falling to 459.4 feet Monday 
  evening.
* Impact...At 464.0 feet, Backwater causes the Fox River to reach 
  bankfull near St. Elizabeth Medical Center in Ottawa.
* Flood History...This crest compares to a previous crest of 463.5 
  feet on 02/10/2008.


&&

LAT...LON 4137 8898 4137 8879 4130 8879 4128 8899

$$

ILC099-291800-
/O.EXT.KLOT.FL.W.0010.000000T0000Z-210630T0000Z/
/LNRI2.1.ER.210628T1035Z.210628T2330Z.210629T1800Z.NO/
957 PM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until tomorrow evening...

The Flood Warning continues for
  the Vermilion River near Leonore.
* Until Tuesday evening.
* At 8:45 PM CDT Monday the stage was 16.3 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 PM CDT Monday was 16.4 feet.
* Forecast...The river is expected to fall below flood stage early 
  tomorrow afternoon and continue falling to 7.6 feet Monday evening.
* Impact...At 16.0 feet, Water begins to flood low lying 
  agricultural land near river.
* Flood History...This crest compares to a previous crest of 16.4 
  feet on 09/08/1989.


&&

LAT...LON 4131 8912 4132 8899 4113 8880 4109 8889

$$

ILC105-291800-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210630T0112Z/
/PNTI2.2.ER.210627T0430Z.210628T0730Z.210629T1912Z.NO/
957 PM CDT Mon Jun 28 2021

...The Flood Warning is now in effect until tomorrow evening...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until Tuesday evening.
* At 8:45 PM CDT Monday the stage was 15.5 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 PM CDT Monday was 15.7 feet.
* Forecast...The river is expected to fall below flood stage early 
  tomorrow afternoon and continue falling to 5.0 feet Monday evening.
* Impact...At 15.0 feet, Low-lying residences threatened between 
  Mill Street and Chautauqua Park in Pontiac. IL-116 threatened east 
  and west of Pontiac.
* Flood History...This crest compares to a previous crest of 15.5 
  feet on 04/24/1944.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Lenning

489 
WGUS83 KLOT 291606
FLSLOT

Flood Statement
National Weather Service Chicago IL
1106 AM CDT Tue Jun 29 2021

...The Flood Warning is extended for the following rivers in 
Illinois...

  Vermilion River near Leonore affecting La Salle County.

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

A Flood Warning means water levels above flood stage are imminent or 
may already occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

The next statement is expected around 1000 PM CDT tonight.

&&


ILC099-300715-
/O.EXT.KLOT.FL.W.0010.000000T0000Z-210630T0900Z/
/LNRI2.1.ER.210628T1035Z.210629T1800Z.210630T0300Z.NO/
1106 AM CDT Tue Jun 29 2021

...The Flood Warning is now in effect until late tonight...

The Flood Warning continues for
  the Vermilion River near Leonore.
* Until late tonight.
* At 10:45 AM CDT Tuesday the stage was 16.6 feet.
* Flood stage is 16.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 AM CDT Tuesday was 16.7 feet.
* Forecast...The river is expected to rise to a crest of 17.0 feet 
  this afternoon. It will then fall below flood stage late this 
  evening.
* Impact...At 16.0 feet, Water begins to flood low lying 
  agricultural land near river.
* Flood History...This crest compares to a previous crest of 17.0 
  feet on 05/07/2012.


&&

LAT...LON 4131 8912 4132 8899 4113 8880 4109 8889

$$

ILC105-300715-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210630T0824Z/
/PNTI2.2.ER.210627T0430Z.210628T0730Z.210630T0224Z.NO/
1106 AM CDT Tue Jun 29 2021

...The Flood Warning is now in effect until late tonight...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until late tonight.
* At 10:45 AM CDT Tuesday the stage was 14.8 feet.
* Flood stage is 14.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:45 AM CDT Tuesday was 15.7 feet.
* Forecast...The river is expected to fall below flood stage late 
  this evening and continue falling to 5.2 feet Tuesday morning.
* Impact...At 15.0 feet, Low-lying residences threatened between 
  Mill Street and Chautauqua Park in Pontiac. IL-116 threatened east 
  and west of Pontiac.
* Flood History...This crest compares to a previous crest of 14.8 
  feet on 12/31/2009.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Birk

035 
WGUS43 KLOT 300259
FLWLOT

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Chicago IL
959 PM CDT Tue Jun 29 2021

...The Flood Warning continues for the following rivers in 
Illinois...

  Vermilion River at Pontiac affecting Livingston County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means water levels above flood stage are imminent or 
may already occurring. Persons along rivers and streams in the 
warned area should take immediate precautions to protect life and 
property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Additional information is available at www.weather.gov/Chicago and 
water.weather.gov

&&


ILC105-300700-
/O.EXT.KLOT.FL.W.0006.000000T0000Z-210630T0700Z/
/PNTI2.1.ER.210627T0430Z.210628T0730Z.210630T0236Z.NO/
959 PM CDT Tue Jun 29 2021

...Observed flooding increased from Minor to Moderate severity and 
increased in duration until just after midnight tonight...

The Flood Warning continues for
  the Vermilion River at Pontiac.
* Until late tonight.
* At 8:45 PM CDT Tuesday the stage was 14.1 feet.
* Flood stage is 14.0 feet.
* Moderate flooding is occurring.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 8:45 PM CDT Tuesday was 15.4 feet.
* Forecast...The river is expected to fall below flood stage early 
  Wednesday morning.
* Impact...At 15.0 feet, Low-lying residences threatened between 
  Mill Street and Chautauqua Park in Pontiac. IL-116 threatened east 
  and west of Pontiac.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Kluber

473 
WGUS83 KLOT 300658
FLSLOT

Flood Statement
National Weather Service Chicago IL
158 AM CDT Wed Jun 30 2021

...The Flood Warning is cancelled for the following rivers in 
Illinois...

  Vermilion River at Pontiac affecting Livingston County.

ILC105-300800-
/O.CAN.KLOT.FL.W.0006.000000T0000Z-210630T0658Z/
/PNTI2.1.ER.210627T0430Z.210628T0730Z.210630T0236Z.NO/
158 AM CDT Wed Jun 30 2021

...The Flood Warning for the Vermilion River at Pontiac has been 
cancelled...

The Flood Warning is cancelled for
  the Vermilion River at Pontiac.
* At 1:45 AM CDT Tuesday the stage was 13.8 feet.
* Flood stage is 14.0 feet.
* Forecast...The river is expected to fall to 5.1 feet Tuesday 
  evening.


&&

LAT...LON 4109 8889 4113 8880 4084 8852 4079 8861

$$

Borchardt

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
636 PM CDT Sat Jun 26 2021

.MESOSCALE DISCUSSION...
259 PM CDT

As we've been dealing with since the late morning, concerns
continue to include brief tornadoes, strong downburst winds, and
flash flooding. Area of interest is similar to those already
impacted earlier, if a bit farther south. This is near and
southeast of the I-55 corridor. Isolated showers/storms will be
possible north of this, though with much less instability with
northward extent, not expecting the intensity like with farther
south.

An MCV noted emanating from near St Louis area interacted with
brief clearing that occurred into western and west central
Illinois to fire new convection southwest of the ongoing storms.
These have exhibited robust lower level mesos in the strongest
storms like has occurred over our area. This is tied to good low
level hodograph curvature for Bunkers right moving storms
yielding near 150 to 200 m2/s2 of 0-1km SRH, along with 0-3 km
MLCAPE of 100-175 J/kg. Over the next 2-3 hours we'll be watching
the ongoing storms for strengthening low level rotation, as well
as the storms over west central Illinois approaching the central
IL counties in our CWA.

Finally, the 2"+ PWAT axis draped across the region will continue
to support torrential downpours in the strongest convection
capable of flash flooding. The earlier issued FFW for the Chicago
metro did have reports of flash flood impacts within it. Issued a
large Flood Advisory for areas currently and to continue to be
impacted over the next few hours, with the expectation of likely
needing to issue at least a few targeted Flash Flood Warnings. Of
particular concern is the eastern Livingston, northern Ford
Panhandle into northwest Iroquois, which has received at least 6"
of rain the past couple days, if they receive multiple additional
rounds of convection.

Castro

&&

.SHORT TERM...
340 PM CDT

Through Sunday...

Expect that showers and thunderstorms will continue to line up
from southwest to northeast near and east of I-55 into early
evening with a shift to the southeast with time. Forcing looks
then become less coherent through the evening but the
southwesterly flow aloft will persist so will maintain a chance
for showers and some thunderstorms overnight. Have left the flash
flood watch as is for now as did not have much time to fully
assess but may be able to trim western sections out this evening
and possibly the entire watch if the corridor of thunderstorms
shifts to the east.

For Sunday, guidance is in agreement in pushing a frontal boundary
southward into the area later in the day. The airmass does not
look as favorable for shower/storms but cannot rule out some
isolated to scattered activity with the front in the afternoon.

MDB

&&

.LONG TERM...
340 PM CDT

No major changes in thinking for the long term so previous
discussion follow...

Sunday night through Friday...

Long term forecast concerns continue to be focused on the threat
of additional periods thunderstorms especially into the first half
of the coming week, as the upper pattern remains largely
unchanged. As we remain within a very moist air mass, storms will
likely remain capable of torrential downpours and flooding.

Unusually strong upper ridging over the Pacific Northwest, and
another strong upper ridge centered just of the mid-Atlantic coast
will maintain an upper level trough from Hudson Bay to the
central Plains into early next week. South-southwest flow east of
the trough axis will maintain a feed of deep Gulf moisture into
the mid- Mississippi Valley and western/southern Great Lakes
region during this time, as depicted by a plume of PWATs around 2
inches which is progged to remain in the vicinity of the forecast
area during the first half of the week. A weak surface cold front
will push into the CWA Sunday, but is expected to wash out and
become diffuse in the vicinity of the forecast area as southwest
flow aloft maintains warm/moist advection into the region. This
would tend to lift or redevelop the diffuse front back north later
Monday night and Tuesday, thus additional rounds of periodic
showers and thunderstorms will likely continue to affect the
forecast area early in the week. Since we're already seen some
significant rainfall across some parts of the forecast area over
the past two days, any further rounds of heavy-rain producing
storms over the next several days will only serve to increase
flooding/flash flooding potential across the region. Of course,
rain threat will likely be modulated by individual small-scale
short waves or MCV features and it won't rain continuously, but
total amounts will need to be monitored.

By mid-week (Wednesday), ridging off the mid-Atlantic coast
weakens and drifts east a bit, allowing some eastward shift of
the upper trough across the upper Midwest and western Lakes
region. With a more westerly component to the flow aloft, this
looks to foster a southeastward shift in the axis of deeper
moisture into the Ohio Valley region. Medium-range guidance
continues to trend toward digging additional upper energy south
from Ontario during the Wednesday into Thursday period however,
and developing a closed upper low across the western Lakes/mid-
Mississippi Valley region late in the week. While scouring out the
deeper moisture, this mid- level circulation would likely
continue to support a threat of at least diurnally-driven
showers/thunderstorms to end the week and possibly into the
weekend.

Temperature wise, conditions look to remain seasonably warm and
rather humid for the first half of the week. Cooler conditions are
likely late in the week as flow turns more north-northwesterly.

MDB/Ratzer

&&

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

Rain continues across ORD/MDW/GYY but will be diminishing in the
next few hours. Some spotty MVFR level clouds are in the area but
am not expecting MVFR ceilings at this point. Will need to watch
thunderstorms moving east across eastern Iowa as they may hold
together to some degree but latest guidance suggest they will
fade. Will need to keep an eye on this and may need to include a
mention of showers after 06 or 08z or so. Sunday will be less
favorable for shower/thunder activity than today but cannot rule
out something isolated through the day. A weak front will arrive
from the north but likely fall apart as it arrives late in the
afternoon but there may be enough forcing to trigger some isolated
showers/storms so will carry a PROB30 mention for now. Expect a
steady southwest wind overnight which which may become gusty to
near 20 kt later Sunday morning. The dissipating front may result
in some erratic winds in the afternoon but they may turn north to
northeast toward 00z.

MDB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Flash Flood Watch...ILZ010-ILZ011-ILZ012-ILZ013-ILZ019-ILZ020-
     ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-ILZ103-ILZ104-ILZ105-
     ILZ106-ILZ107-ILZ108 until 7 AM Sunday.

IN...Flash Flood Watch...INZ001-INZ002-INZ010-INZ011-INZ019 until 7
     AM Sunday.

LM...None.
&&

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Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
424 PM CDT Sat Jun 26 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-272130-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
424 PM CDT Sat Jun 26 2021 /524 PM EDT Sat Jun 26 2021/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited Tornado risk.
     Limited hail risk...up to quarter size.
     Limited damaging wind risk...up to 70 mph|.
     Limited Flooding Risk.
     Limited Non thunderstorm wind Risk.

DISCUSSION...

  Showers and thunderstorms will continue to move northeastward
  along and south of the Interstate 55 corridor into this evening.
  Torrential rainfall will occur with these storms along with the
  possibility of isolated tornadoes and damaging wind gusts to 70
  mph. Flash flooding is also possible. Thunderstorm coverage and
  intensity is expected to wane later this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Limited Excessive Heat Risk.
Monday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Tuesday through Friday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the northeast at around 35 mph.

LMZ740>745-272130-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
424 PM CDT Sat Jun 26 2021

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.
  Elevated Thunderstorm Risk...with an associated:
     Limited Waterspout Risk.
     Limited hail risk...up to quarter size.
     Limited thunderstorm wind gust risk...up to 55 kt.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday through Friday...
  Limited Thunderstorm Risk.

MDB

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
349 PM CDT SAT JUN 26 2021

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

0207 PM     TSTM WND DMG     1 S CRETE               41.44N 87.63W
06/26/2021                   WILL               IL   EMERGENCY MNGR

            TREE AND STRUCTURAL DAMAGE REPORTED ON THE
            SOUTH SIDE OF CRETE.

&&

RO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
437 PM CDT SAT JUN 26 2021

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

0432 PM     FUNNEL CLOUD     1 W GOODENOW            41.39N 87.65W
06/26/2021                   WILL               IL   TRAINED SPOTTER

            NUMEROUS REPORTS OF A ROTATING FUNNEL CLOUD
            NORTH OF BEECHER.

&&

RO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
529 PM CDT SAT JUN 26 2021

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

0436 PM     TSTM WND DMG     CHATSWORTH              40.75N 88.29W
06/26/2021                   LIVINGSTON         IL   CO-OP OBSERVER

            TREES DOWNED, CAMPER BLOWN OVER, GARAGE
            BUILDING DAMAGED.

&&

RO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
552 PM CDT SAT JUN 26 2021

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

0330 PM     FLASH FLOOD      1 SW HERMOSA - CHICAGO  41.91N 87.75W
06/26/2021                   COOK               IL   PUBLIC

            ROAD UNDERNEATH OVERPASS FLOODED. CAR
            SUBMERGED IN FLOOD WATERS.

&&

RO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
625 PM CDT SAT JUN 26 2021

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

0615 PM     FUNNEL CLOUD     EARL PARK               40.69N 87.41W
06/26/2021                   BENTON             IN   EMERGENCY MNGR

            BRIEF FUNNEL CLOUDS REPORTED VIA EMERGENCY
            MANAGEMENT OVER EARL PARK.

&&

PETR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
642 PM CDT SAT JUN 26 2021

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

0600 PM     FLASH FLOOD      1 WNW GLENWOOD          41.55N 87.63W
06/26/2021                   COOK               IL   PUBLIC

            PHOTOS SHARED ON SOCIAL MEDIA SHOW GEORGE
            ARQUILLA PARK IN GLENWOOD FLOODED.

&&

RO