Special Weather Statement for McHenry Co., IL

<pre>WWUS83 KLOT 020548 SPSLOT

Special Weather Statement National Weather Service Chicago/Romeoville Il 1248 AM CDT SUN SEP 2 2018

Kane IL-De Kalb IL-McHenry IL- 1248 AM CDT SUN SEP 2 2018

…SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DE KALB…NORTHERN KANE AND SOUTHERN MCHENRY COUNTIES UNTIL 130 AM CDT…

At 1247 AM CDT, Doppler radar was tracking a strong thunderstorm near Hampshire, or 7 miles southeast of Marengo, moving east at 20 mph.

Dime size hail and winds in excess of 40 mph will be possible with this storm.

Locations impacted include… Elgin, Carpentersville, Algonquin, McHenry, Woodstock, Marengo, Sleepy Hollow, East Dundee, Lake In The Hills, Huntley, West Dundee, Gilberts, Hampshire, Lakewood, Prairie Grove, Bull Valley, Trout Valley, Crystal Lake, Cary and Pingree Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways.

&&

LAT…LON 4203 8868 4222 8866 4232 8825 4209 8826 TIME…MOT…LOC 0547Z 258DEG 16KT 4216 8853 </pre>

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Areal Flood Advisory for McHenry Co., IL until 04:00 AM CDT 9/2

<pre>WGUS83 KLOT 020534 FLSLOT

Flood Advisory National Weather Service Chicago/Romeoville Il 1234 AM CDT SUN SEP 2 2018

/O.NEW.KLOT.FA.Y.0045.180902T0534Z-180902T0900Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lake IL-De Kalb IL-Winnebago IL-Kane IL-McHenry IL-Cook IL-Boone IL- 1234 AM CDT SUN SEP 2 2018

The National Weather Service in Chicago has issued a

• Urban and Small Stream Flood Advisory for Poor Drainage Areas for… Lake County in northeastern Illinois… Northeastern De Kalb County in north central Illinois… Northern Winnebago County in north central Illinois… Northern Kane County in northeastern Illinois… McHenry County in northeastern Illinois… Northwestern Cook County in northeastern Illinois… Northeastern Boone County in north central Illinois…

• Until 400 AM CDT

• At 1231 AM CDT, Doppler radar indicated heavy rain occurring across portions of the advisory due to thunderstorms. This heavy rainfall will likely cause urban and small stream flooding. Overflowing poor drainage areas will result in minor flooding in the advisory area. Radar rainfall estimates indicate between 2 and 3 inches of rain has already fallen along and axis from north of Rochelle to near Marengo with these storms since last evening, and additional heavy rainfall is expected over parts of the area overnight.

• Some locations that will experience flooding include… Rockford, Elgin, Waukegan, Arlington Heights, Palatine, Hoffman Estates, Buffalo Grove, Carpentersville, Wheeling, Northbrook, North Chicago, Gurnee, Mundelein, Algonquin, Highland Park, McHenry, Vernon Hills, Woodstock, Zion and Loves Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

Be especially cautious at night when it is harder to recognize the dangers of flooding.

&&

LAT…LON 4249 8780 4229 8783 4216 8776 4201 8874

4233 8874 4233 8940 4250 8940

</pre>

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Flash Flood Watch for McHenry Co., IL until 07:00 AM CDT 9/2

<pre>WGUS63 KLOT 020236 FFALOT

Flood Watch National Weather Service Chicago IL 936 PM CDT Sat Sep 1 2018

…Additional Thunderstorms Tonight…

.Scattered thunderstorms will continue across northern Illinois tonight. A tropical, moisture rich air mass will promote efficient and heavy rainfall rates. Thunderstorms may regenerate or move over areas already impacted by heavy rainfall resulting in flash flooding.

/O.CON.KLOT.FF.A.0007.000000T0000Z-180902T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- Including the cities of Rockford, Belvidere, Woodstock, Waukegan, Oregon, Dixon, DeKalb, Aurora, Elgin, Wheaton, and Chicago 936 PM CDT Sat Sep 1 2018

…FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SUNDAY…

The Flash Flood Watch continues for

• Portions of north central Illinois and northeast Illinois, including the following areas, in north central Illinois, Boone, DeKalb, Lee, Ogle, and Winnebago. In northeast Illinois, Cook, DuPage, Kane, Lake IL, and McHenry.

• Until 7 AM CDT Sunday

• Repeated rounds of thunderstorms producing very heavy rainfall may result in flash flooding.

• Expect rises on area rivers and streams.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

&& </pre>

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Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 012051 HWOLOT

Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 351 PM CDT Sat Sep 1 2018

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford- Lake IN-Porter-Newton-Jasper-Benton- 351 PM CDT Sat Sep 1 2018 /451 PM EDT Sat Sep 1 2018/

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 hail risk...up to quarter size.     Limited damaging wind risk...up to 60 mph.  Elevated Flooding Risk.

DISCUSSION…

Thunderstorms are expected to redevelop this evening and continue through the overnight. The highest thunderstorm coverage is likely to be primarily north of Interstate 80. All thunderstorms will be capable of producing frequent cloud to ground lightning. Torrential downpours could cause flooding. In addition, the strongest thunderstorms may be capable of producing damaging winds and or large hail.

.DAYS TWO THROUGH SEVEN…Sunday through Friday.

Sunday…

Limited Severe Thunderstorm Risk.  Limited Flooding Risk.  Limited Excessive Heat Risk.

Monday…

Elevated Flooding Risk.  Elevated Thunderstorm Risk.  Limited Excessive Heat Risk.

Tuesday and Wednesday…

Limited Thunderstorm Risk.  Limited Excessive Heat Risk.

Friday…

Limited Thunderstorm Risk.

DISCUSSION:

A period of unsettled weather is expected through at least mid-week. Warm and humid conditions are expected with periodic chances for thunderstorms. For Sunday, there is a chance that some of the stronger storms may be severe, with strong winds and large hail being the primary severe threats. In addition, heavy rainfall may occur in some of the storms and could lead to localized flooding.

.SPOTTER INFORMATION STATEMENT…

Spotters may be needed this evening.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east around 30 mph.

</pre>

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Flash Flood Watch for McHenry Co., IL until 07:00 AM CDT 9/2

<pre>WGUS63 KLOT 012007 FFALOT

URGENT – IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Chicago IL 307 PM CDT Sat Sep 1 2018

…Additional Thunderstorms This Evening and Overnight…

.Thunderstorms are expected to redevelop this evening and tonight across far northern Illinois. A tropical, moisture rich air mass will promote efficient and heavy rainfall rates. Thunderstorms may regenerate or move over areas already impacted by heavy rainfall resulting in flash flooding.

/O.NEW.KLOT.FF.A.0007.180902T0000Z-180902T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- Including the cities of Rockford, Belvidere, Woodstock, Waukegan, Oregon, Dixon, DeKalb, Aurora, Elgin, Wheaton, and Chicago 307 PM CDT Sat Sep 1 2018

…FLASH FLOOD WATCH IN EFFECT FROM 7 PM CDT THIS EVENING THROUGH SUNDAY MORNING…

The National Weather Service in Chicago has issued a

• Flash Flood Watch for portions of north central Illinois and northeast Illinois, including the following areas, in north central Illinois, Boone, DeKalb, Lee, Ogle, and Winnebago. In northeast Illinois, Cook, DuPage, Kane, Lake IL, and McHenry.

• From 7 PM CDT this evening through Sunday morning

• Repeated rounds of thunderstorms producing very heavy rainfall may result in flash flooding.

• Expect rises on area rivers and streams.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

&& </pre>

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Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 011742 HWOLOT

Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 1242 PM CDT Sat Sep 1 2018

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford- Lake IN-Porter-Newton-Jasper-Benton- 1242 PM CDT Sat Sep 1 2018 /142 PM EDT Sat Sep 1 2018/

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

.DAY ONE…This Afternoon and Tonight.

Weather hazards expected…

Elevated Thunderstorm Risk...with an associated:     Limited hail risk...up to quarter size.     Limited damaging wind risk...up to 60 mph.  Elevated Flooding Risk.

DISCUSSION…

Thunderstorms are expected to redevelop late this afternoon into this evening and continue through the overnight. The highest thunderstorm coverage is likely to be primarily north of Interstate 80. All thunderstorms will be capable of producing frequent cloud to ground lightning. Torrential downpours could cause flooding. In addition, the strongest thunderstorms may be capable of producing damaging winds and or large hail.

.DAYS TWO THROUGH SEVEN…Sunday through Friday.

Sunday…

Limited Severe Thunderstorm Risk.  Limited Flooding Risk.  Limited Excessive Heat Risk.

Monday…

Elevated Flooding Risk.  Elevated Thunderstorm Risk.  Limited Excessive Heat Risk.

Tuesday and Wednesday…

Limited Thunderstorm Risk.  Limited Excessive Heat Risk.

Friday…

Limited Thunderstorm Risk.

DISCUSSION:

A period of unsettled weather is expected through at least mid-week. Warm and humid conditions are expected with periodic chances for thunderstorms. For Sunday, there is a chance that some of the stronger storms may be severe, with strong winds and large hail being the primary severe threats. In addition, heavy rainfall may occur in some of the storms and could lead to localized flooding.

.SPOTTER INFORMATION STATEMENT…

Spotters may be needed late this afternoon into this evening.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at around 30 mph.

</pre>

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Hazardous Weather Outlook for McHenry Co., IL

<pre>FLUS43 KLOT 010957 HWOLOT

Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 457 AM CDT Sat Sep 1 2018

Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook- La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford- Lake IN-Porter-Newton-Jasper-Benton- 457 AM CDT Sat Sep 1 2018 /557 AM EDT Sat Sep 1 2018/

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

.DAY ONE…Today and Tonight.

Weather hazards expected…

Significant Thunderstorm Risk...with an associated:     Limited hail risk...up to quarter size.     Limited damaging wind risk...up to 60 mph.  Elevated Flooding Risk.  

DISCUSSION…

Thunderstorms are spreading across into northwestern Illinois this morning and are expect to continue into the morning. Additional periods of thunderstorms are likely today, though exact timing and coverage is still uncertain. Some of the stronger storms will have the potential to produce damaging winds and large hail. In addition, heavy rainfall may occur in some of the storms and could lead to localized flooding.

.DAYS TWO THROUGH SEVEN…Sunday through Friday.

Sunday…

Limited Severe Thunderstorm Risk.  Limited Flooding Risk.  Limited Excessive Heat Risk.

Monday…

Elevated Flooding Risk.  Elevated Thunderstorm Risk.  Limited Excessive Heat Risk.

Tuesday and Wednesday…

Limited Thunderstorm Risk.  Limited Excessive Heat Risk.

Friday…

Limited Thunderstorm Risk.

DISCUSSION:

A period of unsettled weather is expected through at least mid-week. Warm and humid conditions are expected with periodic chances for thunderstorms. For Sunday, there is a chance that some of the stronger storms may be severe, with strong winds and large hail being the primary severe threats. In addition, heavy rainfall may occur in some of the storms and could lead to localized flooding.

.SPOTTER INFORMATION STATEMENT…

Spotters may be needed today into this evening.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 30 mph.

</pre>

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