2 products issued by NWS for: Deerfield IL
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
335 PM CDT Thu Jul 10 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-112045-
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-
335 PM CDT Thu Jul 10 2025 /435 PM EDT Thu Jul 10 2025/
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:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Level 1 of 5 Hail Risk...up to ping pong ball sized.
Level 1 of 5 Tornado Risk.
Elevated Flooding Risk.
DISCUSSION...
A few rounds of thunderstorms are expected this afternoon through
tonight. Isolated severe storms through this evening will be
capable of producing damaging winds, large hail, and a localized
tornado threat. Heavy rainfall could result in some areas of flash
flooding, particularly in areas that receive multiple rounds of
storms. The area of greatest concern for flash flooding through
the overnight is roughly near and north of I-80.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Friday and Saturday...
Elevated Thunderstorm Risk...with an associated:
Level 1 to 2 of 5 Severe Thunderstorm Risk.
Limited to Elevated Flooding Risk.
Wednesday...
Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotter reports will likely be needed through tonight.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east northeast at 15 to 30 mph.
$$
Hydrologic Outlook
Hydrologic Outlook ILC007-031-037-043-063-089-093-097-099-103-111-141-197-201-INC089- 127-110200- Hydrologic Outlook National Weather Service Chicago IL 254 PM CDT Thu Jul 10 2025 ...Torrential rain producing storms may lead to instances of localized flooding tonight and on Friday... Waves of showers and thunderstorms are expected to move across portions of northern Illinois and possibly far northwest Indiana tonight. Heavy rainfall rates of up to two inches per hour will be possible with these storms as they shift eastward. Rainfall amounts of this magnitude may cause instances of flash flooding, along with significant rises on area streams and rivers, some of which could reach or exceed flood stage. This outlook means that elevated water levels and potential impacts are possible, but not yet certain, particularly for areas near and north of I-80. Persons with interests along area streams and rivers should closely monitor the latest forecasts. A Flood Watch may be needed if confidence continues to increase in which areas of northern IL have the highest threat of repeated instances of heavy rainfall tonight and on Friday. $$