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FLOOD WARNING
FLOOD WARNING ISSUED APRIL 19 AT 8:00PM CDT
Effective: 2026-04-19 20:00:00 Local Time Expires: 2026-04-20 14:00:00 Local Time Issued by: NWS Chicago IL
Alert Text
...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS INILLINOIS...

ROCK RIVER AT BYRON AFFECTING OGLE COUNTY.

ROCK RIVER AT ROCKTON AFFECTING WINNEBAGO COUNTY.

ROCK RIVER AT LATHAM PARK AFFECTING WINNEBAGO COUNTY.

* WHAT...MODERATE FLOODING IS OCCURRING AND FORECASTED TO CONTINUE.

* WHERE...ROCK RIVER FROM CONFLUENCE WITH KISHWAUKEE RIVER TO CASTLE ROCK STATE PARK NEAR OREGON, INCLUDING THE BYRON GAUGE.

* WHEN...UNTIL FURTHER NOTICE.

* IMPACTS...AT 15.5 FEET, WATER THREATENS LOWER SECTIONS OF THE WATER TREATMENT PLANT PROPERTY IN BYRON. WATER THREATENS IL-2 WEST OF BYRON.

* ADDITIONAL DETAILS... - AT 7:15 PM CDT SUNDAY THE STAGE WAS 15.2 FEET. - FORECAST...THE RIVER IS EXPECTED TO REMAIN NEARLY STEADY THROUGH TOMORROW AFTERNOON BEFORE GRADUALLY FALLING THEREAFTER. - FLOOD STAGE IS 13.0 FEET. - HTTP: WWW.WEATHER.GOV SAFETY FLOOD
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Target Area
OGLE, IL
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Hazardous Weather Conditions

Freeze Watch issued April 18 at 11:59PM EDT until April 21 at 10:00AM EDT
Freeze Watch issued April 19 at 8:38AM EDT until April 21 at 10:00AM EDT
Freeze Watch issued April 19 at 1:20PM EDT until April 21 at 10:00AM EDT
Freeze Watch issued April 19 at 9:13PM EDT until April 21 at 10:00AM EDT
Freeze Warning issued April 19 at 11:35PM EDT until April 21 at 10:00AM EDT

Current Conditions: CHEVY CHASE, MARYLAND

LEESBURG/GODFREY (KJYO)

Cloudy

46.4 F
Humidity:71%
Wind Speed:NW 11.4 G 16.1 mph
Barometer:30.18 in
Dewpoint:37.4 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:41.0 F
Apr 20 2026, 06:55 AM EDT
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5 Day Forecast for CHEVY CHASE, MARYLAND (20815)

Monday

High 55 °F
Slight Chance of Rain Showers
Monday
Night
Low 32 °F
Mostly Clear
Tuesday

High 62 °F
Mostly Sunny
Tuesday
Night
Low 50 °F
Chance of Rain
Wednesday

High 73 °F
T-storms Likely
Wednesday
Night
Low 51 °F
Partly Cloudy
Thursday

High 78 °F
Mostly Sunny
Thursday
Night
Low 57 °F
Partly Cloudy
Friday

High 82 °F
Mostly Sunny

Observation History for CHEVY CHASE, MARYLAND


Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
06:55 AM EDT NW 11.4 G 16.1 10.00 Cloudy -- 46.4 37.4 71% 41.0 NA 30.18 1022.0
06:35 AM EDT 10.3 10.00 Cloudy -- 46.4 35.6 66% 41.5 NA 30.17 1021.7
06:15 AM EDT 9.2 10.00 Cloudy -- 46.4 35.6 66% 41.9 NA 30.16 1021.3
05:55 AM EDT W 5.8 10.00 Cloudy -- 44.6 35.6 70% 41.4 NA 30.16 1021.3
05:35 AM EDT W 6.9 10.00 Mostly Cloudy -- 44.6 35.6 70% 40.6 NA 30.16 1021.3
05:15 AM EDT 6.9 10.00 Cloudy -- 44.6 35.6 70% 40.6 NA 30.15 1021.0
04:55 AM EDT W 10.3 10.00 Cloudy -- 46.4 35.6 66% 41.5 NA 30.15 1021.0
04:35 AM EDT W 11.4 G 18.3 10.00 Cloudy -- 46.4 35.6 66% 41.0 NA 30.16 1021.3
04:15 AM EDT G 24.2 10.00 Light Drizzle -- 46.4 35.6 66% NA NA 30.16 1021.3
03:55 AM EDT G 28.9 10.00 Light Rain -- 46.4 35.6 66% NA NA 30.15 1021.0
03:35 AM EDT 9.2 10.00 Cloudy -- 44.6 35.6 70% 39.7 NA 30.15 1021.0
03:15 AM EDT NW 3.4 10.00 Cloudy -- 44.6 35.6 70% 43.2 NA 30.15 1021.0
02:55 AM EDT 0.0 10.00 Cloudy -- 42.8 35.6 76% NA NA 30.14 1020.7
02:35 AM EDT 0.0 10.00 Cloudy -- 42.8 35.6 76% NA NA 30.15 1021.0
02:15 AM EDT 0.0 10.00 Cloudy -- 42.8 37.4 81% NA NA 30.16 1021.3
01:55 AM EDT 0.0 10.00 Cloudy -- 42.8 35.6 76% NA NA 30.15 1021.0
01:35 AM EDT 0.0 10.00 Mostly Cloudy -- 42.8 33.8 70% NA NA 30.16 1021.3
01:15 AM EDT 0.0 10.00 Mostly Cloudy -- 42.8 33.8 70% NA NA 30.15 1021.0
12:55 AM EDT 0.0 10.00 Cloudy -- 42.8 35.6 76% NA NA 30.16 1021.3
12:35 AM EDT W 3.4 10.00 Cloudy -- 41.0 35.6 81% 39.0 NA 30.16 1021.3
12:15 AM EDT 0.0 10.00 Cloudy -- 41.0 33.8 75% NA NA 30.15 1021.0
11:55 PM EDT 0.0 10.00 Mostly Cloudy -- 41.0 33.8 75% NA NA 30.15 1021.0
11:35 PM EDT 0.0 10.00 Partly Cloudy -- 37.4 33.8 87% NA NA 30.15 1021.0
11:15 PM EDT 0.0 10.00 Clear -- 41.0 33.8 75% NA NA 30.15 1021.0

Regional Weather Observation

LEESBURG/GODFREY (KJYO)

Cloudy
46.4 F

FREDERICK (KFDK)

Mostly Cloudy
42.8 F

CARROLL CNTY (KDMW)

Cloudy
42.8 F

NSF THURMONT (KRSP)

Mostly Cloudy
37.0 F

WASH DC/DULLES (KIAD)

Light Rain
46.4 F

WASHINGTON/NATL (KDCA)

Light Rain
48.2 F
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