Alert archive / Illinois / Winter Storm Warnings in 2021
Winter Storm Warning 3, NWS Chicago, IL
NWS Chicago, IL issued this winter storm warning at Feb 3, 2021, 2:29 PM CST for 4 counties in Illinois. It took effect at Feb 4, 2021, 9:00 AM CST. It was in force for 18 hr. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Feb 3, 2021, 2:29 PM CST (20:29 UTC)
- In effect from
- Feb 4, 2021, 9:00 AM CST
- Expired
- Feb 5, 2021, 2:41 AM CST
- In force
- 18 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, Lee County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 105 km from the middle of the area, began a volume at 20:28 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 4, 3:00 PM CST | SNOW 1.3 | 4 Ene Winnebago, IL | |
| Feb 4, 6:00 PM CST | SNOW 1.1 | Rockford Airport, IL | TOTAL THROUGH 6PM. |
| Feb 5, 12:00 AM CST | SNOW 1.6 | Rockford Airport, IL | STORM TOTAL SNOW THROUGH 12AM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 124 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1751 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
479 WWUS43 KLOT 032029 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 229 PM CST Wed Feb 3 2021 ...Combination of Accumulating Snow and Blowing Snow Likely Thursday into Thursday Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-040600- /O.UPG.KLOT.WS.A.0003.210204T2100Z-210205T1800Z/ /O.NEW.KLOT.WS.W.0003.210204T1500Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 229 PM CST Wed Feb 3 2021 ...WINTER STORM WARNING IN EFFECT FROM 9 AM THURSDAY TO NOON CST FRIDAY... * WHAT...A period of heavy snow possible with blowing snow likely. Precipitation may begin briefly as freezing rain. Total snow accumulations of 3 to 6 inches possible with highest amounts toward the Wisconsin state line. Winds could gust as high as 40 mph. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...From 9 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially very low visibility due to snow and blowing snow along with snow and ice covered roads. The possible dangerous travel conditions could impact the Thursday afternoon and evening commute. Blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-040600- /O.NEW.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 229 PM CST Wed Feb 3 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THURSDAY TO NOON CST FRIDAY... * WHAT...Snow expected, possibly starting briefly as rain or freezing rain. Snow could become heavy Thursday afternoon into the early evening. Total snow accumulations of 2 to 5 inches. Winds gusting as high as 40 mph. * WHERE...Portions of north central and northeast Illinois. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions will likely impact the Thursday afternoon and evening commute. Pockets of blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-105>108-INZ001-002-040600- /O.NEW.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ La Salle-Kendall-Grundy-Southern Cook-Northern Will-Southern Will- Eastern Will-Lake IN-Porter- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, and Chesterton 229 PM CST Wed Feb 3 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THURSDAY TO NOON CST FRIDAY... * WHAT...Snow expected, possibly starting briefly as rain or freezing rain. Snow could become heavy Thursday afternoon into the early evening. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 40 mph. * WHERE...Portions of north central and northeast Illinois and northwest Indiana. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions will likely impact the Thursday afternoon and evening commute. Pockets of blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$ Carlaw
6 follow-up statements
056 WWUS43 KLOT 040339 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 939 PM CST Wed Feb 3 2021 ...Combination of Accumulating Snow and Blowing Snow Likely Thursday into Thursday Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-041145- /O.CON.KLOT.WS.W.0003.210204T1500Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 939 PM CST Wed Feb 3 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 9 AM THURSDAY TO NOON CST FRIDAY... * WHAT...A period of heavy snow possible with blowing snow likely. Precipitation may begin briefly as freezing rain. Total snow accumulations of 3 to 6 inches possible with highest amounts toward the Wisconsin state line. Winds could gust as high as 40 mph. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...From 9 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially very low visibility due to snow and blowing snow along with snow and ice covered roads. The possible dangerous travel conditions could impact the Thursday afternoon and evening commute. Blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-041145- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 939 PM CST Wed Feb 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THURSDAY TO NOON CST FRIDAY... * WHAT...Snow expected, possibly starting briefly as rain or freezing rain. Snow could become heavy Thursday afternoon into the early evening. Total snow accumulations of 2 to 5 inches. Winds gusting as high as 40 mph. * WHERE...Portions of north central and northeast Illinois. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions will likely impact the Thursday afternoon and evening commute. Pockets of blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-105>108-INZ001-002-041145- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ La Salle-Kendall-Grundy-Southern Cook-Northern Will-Southern Will- Eastern Will-Lake IN-Porter- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, and Chesterton 939 PM CST Wed Feb 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THURSDAY TO NOON CST FRIDAY... * WHAT...Snow expected, possibly starting briefly as rain or freezing rain. Snow could become heavy Thursday afternoon into the early evening. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 40 mph. * WHERE...Portions of north central and northeast Illinois and northwest Indiana. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions will likely impact the Thursday afternoon and evening commute. Pockets of blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures Thursday afternoon and evening could cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$
604 WWUS43 KLOT 040930 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 330 AM CST Thu Feb 4 2021 ...Combination of Accumulating Snow and Blowing Snow This Afternoon into this Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-041730- /O.CON.KLOT.WS.W.0003.210204T1500Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 330 AM CST Thu Feb 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 9 AM THIS MORNING TO NOON CST FRIDAY... * WHAT...A period of mixed precipitation, including freezing rain, possible this morning, then a period of heavy snow this afternoon. Blowing snow likely late this afternoon through Friday morning when west winds will gust to 40 to 45 mph. Total snow accumulations of 3 to 5 inches with higher amounts possible. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...From 9 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially very low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous, and possibly dangerous, during this evening's commute. Blowing snow could continue to impact the Friday morning commute. * ADDITIONAL DETAILS...Sharply falling temperatures late this afternoon and tonight will cause any wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ023-032-INZ010-011-041730- /O.EXA.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ Kankakee-Livingston-Newton-Jasper- Including the cities of Kankakee, Bourbonnais, Bradley, Pontiac, Dwight, Fairbury, Roselawn, Kentland, Morocco, Rensselaer, and DeMotte 330 AM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO NOON CST FRIDAY... * WHAT...A period of heavy snow this afternoon. Blowing snow possible this afternoon and likely tonight when west winds gust to 40 to 45 mph. Total snow accumulations of 3 to 5 inches with higher amounts possible. * WHERE...In Indiana, Newton and Jasper Counties. In Illinois, Kankakee and Livingston Counties. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. The hazardous conditions will impact this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. * ADDITIONAL DETAILS...Sharply falling temperatures tonight will cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$ ILZ005-006-011>013-103-104-041730- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 330 AM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO NOON CST FRIDAY... * WHAT...A period of light mixed precipitation possible late this morning before a period of heavy snow this afternoon. Blowing snow possible this afternoon and likely tonight when west winds gust to 40 to 45 mph. Total snow accumulations of 2 to 5 inches. * WHERE...Portions of north central and northeast Illinois, including the Chicago metro. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. * ADDITIONAL DETAILS...Sharply falling temperatures tonight will cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-105>108-INZ001-002-041730- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ La Salle-Kendall-Grundy-Southern Cook-Northern Will-Southern Will- Eastern Will-Lake IN-Porter- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, and Chesterton 330 AM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO NOON CST FRIDAY... * WHAT...A period of light mixed precipitation possible late this morning before a period of heavy snow this afternoon. Blowing snow possible this afternoon and likely tonight when west winds gust to 40 to 45 mph. Total snow accumulations of 2 to 4 inches with isolated higher possible. * WHERE...Portions of north central and northeast Illinois and northwest Indiana. * WHEN...From 11 AM Thursday to noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. * ADDITIONAL DETAILS...Sharply falling temperatures tonight will cause any lingering wet spots to freeze quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$ MTF
816 WWUS43 KLOT 041652 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 1052 AM CST Thu Feb 4 2021 ...Combination of Accumulating Snow and Blowing Snow This Afternoon into this Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-050100- /O.CON.KLOT.WS.W.0003.000000T0000Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 1052 AM CST Thu Feb 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Period of heavy snow this afternoon. Blowing snow likely late this afternoon through Friday morning when west winds will gust to 40 to 45 mph. Total snow accumulations of 3 to 5 inches with higher amounts possible. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...till noon CST Friday. * IMPACTS...Plan on potentially very low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous, and possibly dangerous, during this evening's commute. Blowing snow could continue to impact the Friday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-050100- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 1052 AM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...A period of light mixed precipitation possible late this morning before a period of heavy snow this afternoon. Blowing snow possible this afternoon and likely tonight when west winds gust to 40 to 45 mph. Total snow accumulations of 2 to 5 inches. * WHERE...Portions of north central and northeast Illinois, including the Chicago metro. * WHEN...till noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-023-032-105>108-INZ001-002-010-011-050100- /O.CON.KLOT.WW.Y.0004.210204T1700Z-210205T1800Z/ La Salle-Kendall-Grundy-Kankakee-Livingston-Southern Cook- Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton- Jasper- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais, Bradley, Pontiac, Dwight, Fairbury, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, Chesterton, Roselawn, Kentland, Morocco, Rensselaer, and DeMotte 1052 AM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...A period of light mixed precipitation possible late this morning before a period of heavy snow this afternoon. Blowing snow possible this afternoon and likely tonight when west winds gust to 40 to 45 mph. Total snow accumulations of 2 to 4 inches with isolated higher possible. * WHERE...Portions of north central and northeast Illinois and northwest Indiana. * WHEN...till noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$
238 WWUS43 KLOT 042103 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 303 PM CST Thu Feb 4 2021 ...Combination of Accumulating Snow and Blowing Snow into this Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-050515- /O.CON.KLOT.WS.W.0003.000000T0000Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 303 PM CST Thu Feb 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Periods of snow through early evening with an additional 1 to 2 inches possible. West winds will gust as high as 45 mph this evening, and this will result in a potential period of near Blizzard conditions due to blowing and drifting snow. The worst conditions are expected this evening. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...Through noon CST Friday. * IMPACTS...Plan on potentially very low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous, and possibly dangerous, during this evening's commute. Blowing snow could continue to impact the Friday morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-050515- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 303 PM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Periods of snow through mid evening with an additional 1 to 2 inches possible. West winds will gust as high as 45 mph this evening, and this will result in significant blowing and drifting snow. The worst conditions are expected this evening. * WHERE...Portions of north central and northeast Illinois, including the Chicago metro. * WHEN...Through noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-023-032-105>108-INZ001-002-010-011-050515- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ La Salle-Kendall-Grundy-Kankakee-Livingston-Southern Cook- Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton- Jasper- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais, Bradley, Pontiac, Dwight, Fairbury, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, Chesterton, Roselawn, Kentland, Morocco, Rensselaer, and DeMotte 303 PM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Periods of snow through mid evening with an additional 1 to 2 inches possible. West winds will gust as high as 45 mph this evening, and this will result in significant blowing and drifting snow. The worst conditions are expected this evening. * WHERE...Portions of north central and northeast Illinois and northwest Indiana. * WHEN...Through noon CST Friday. * IMPACTS...Plan on potentially low visibility due to snow and blowing snow along with snow and ice covered roads. Conditions will be hazardous during this evening's commute. Blowing snow could continue to impact the Friday morning commute in primarily open areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$
218 WWUS43 KLOT 050332 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 932 PM CST Thu Feb 4 2021 ...Combination of Accumulating Snow and Blowing Snow into this Evening with Blowing Snow Continuing into Friday... ILZ003-004-008-010-051145- /O.CON.KLOT.WS.W.0003.000000T0000Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 932 PM CST Thu Feb 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Occasional light snow. Additional light snow accumulations less than a half inch. Winds gusting as high as 45 mph. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...Until noon CST Friday. * IMPACTS...Snow covered roads will create hazardous road conditions. Areas of blowing snow could significantly reduce visibility. These hazardous conditions could impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-051145- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 932 PM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Occasional light snow. Additional light snow accumulations less than a half inch. Winds gusting as high as 45 mph. * WHERE...Portions of north central and northeast Illinois. * WHEN...Until noon CST Friday. * IMPACTS...Snow covered roads will create hazardous road conditions with some rural roads being impassable. Areas of blowing snow could significantly reduce visibility. These hazardous conditions could impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-023-032-105>108-INZ001-002-010-011-051145- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ La Salle-Kendall-Grundy-Kankakee-Livingston-Southern Cook- Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton- Jasper- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais, Bradley, Pontiac, Dwight, Fairbury, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, Chesterton, Roselawn, Kentland, Morocco, Rensselaer, and DeMotte 932 PM CST Thu Feb 4 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST FRIDAY... * WHAT...Occasional light snow. Additional light snow accumulations less than a half inch. Winds gusting as high as 45 mph. * WHERE...Portions of northwest Indiana and central, north central and northeast Illinois. * WHEN...Until noon CST Friday. * IMPACTS...Snow covered roads will create slippery road conditions. Areas of blowing snow could significantly reduce visibility. These hazardous conditions could impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$
322 WWUS43 KLOT 050841 WSWLOT URGENT - WINTER WEATHER MESSAGE National Weather Service Chicago IL 241 AM CST Fri Feb 5 2021 ...Blowing Snow Continues This Morning... ILZ003-004-008-010-051645- /O.CAN.KLOT.WS.W.0003.000000T0000Z-210205T1800Z/ /O.EXA.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ Winnebago-Boone-Ogle-Lee- Including the cities of Rockford, Belvidere, Rochelle, Oregon, Byron, and Dixon 241 AM CST Fri Feb 5 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON CST TODAY... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Blowing snow. Winds gusting as high as 35 mph. * WHERE...Winnebago, Boone, Ogle and Lee Counties. * WHEN...Until noon CST today. * IMPACTS...Areas of blowing snow will cause drifting which will make for snow covered roads, especially in open areas and on north south roads. Blowing snow may also reduce visibility at times. These hazardous conditions will likely impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling, especially in open areas. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ005-006-011>013-103-104-051645- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ McHenry-Lake IL-De Kalb-Kane-DuPage-Northern Cook-Central Cook- Including the cities of Crystal Lake, Algonquin, McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee, DeKalb, Sycamore, Aurora, Elgin, Naperville, Wheaton, Downers Grove, Lombard, Carol Stream, Evanston, Des Plaines, Schaumburg, Palatine, Northbrook, Chicago, Cicero, Oak Lawn, Oak Park, and La Grange 241 AM CST Fri Feb 5 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST TODAY... * WHAT...Blowing snow. Winds gusting as high as 35 mph. * WHERE...Portions of north central and northeast Illinois. * WHEN...Until noon CST today. * IMPACTS...Areas of blowing snow will cause drifting which will make for snow covered roads, especially in open areas and on north south roads. Blowing snow may also reduce visibility at times. These hazardous conditions will likely impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling, especially in open areas. The latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. && $$ ILZ019>021-023-032-105>108-INZ001-002-010-011-051645- /O.CON.KLOT.WW.Y.0004.000000T0000Z-210205T1800Z/ La Salle-Kendall-Grundy-Kankakee-Livingston-Southern Cook- Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton- Jasper- Including the cities of Ottawa, Streator, La Salle, Mendota, Marseilles, Oswego, Yorkville, Plano, Morris, Coal City, Minooka, Kankakee, Bourbonnais, Bradley, Pontiac, Dwight, Fairbury, Calumet City, Oak Forest, Lemont, Orland Park, Park Forest, Joliet, Bolingbrook, Plainfield, Mokena, Channahon, Manhattan, Wilmington, Crete, Peotone, Beecher, Gary, Hammond, Merrillville, Portage, Valparaiso, Chesterton, Roselawn, Kentland, Morocco, Rensselaer, and DeMotte 241 AM CST Fri Feb 5 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST TODAY... * WHAT...Blowing snow. Winds gusting as high as 35 mph. * WHERE...Portions of northwest Indiana and central, north central and northeast Illinois. * WHEN...Until noon CST today. * IMPACTS...Areas of blowing snow will cause drifting which will make for snow covered roads, especially in open areas and on north south roads. Blowing snow may also reduce visibility at times. These hazardous conditions will likely impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling, especially in open areas. In Illinois, the latest road conditions for Illinois can be obtained on the internet at www.gettingaroundillinois.com. In Indiana, the latest road conditions for Indiana are available by calling 1-800-261-7623. && $$
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 3, 3:03 AM CST | Winter Storm Watch | LOT | Boone, Lee, Ogle, Winnebago | 11 hr |
| Feb 3, 5:47 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, Grundy, Kankakee, LaSalle, Lee and 4 more | 5 hr |
| Feb 3, 6:27 AM CST | Gale Watch | LOT | 9 hr | |
| Feb 3, 6:27 AM CST | Small Craft Advisory | LOT | 36 hr | |
| Feb 3, 2:29 PM CST | Winter Weather Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 10 more | 46 hr |
| Feb 3, 3:04 PM CST | Gale Warning | LOT | 51 hr |
Nearby
Winter Storm Warnings in Illinois, 2021Every winter storm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.