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FLOOD WATCH
FLOOD WATCH ISSUED APRIL 17 AT 1:46PM CDT UNTIL APRIL 21 AT 1:00PM CDT
Effective: 2026-04-17 13:46:00 Local Time [EXPIRED] Expires: 2026-04-21 13:00:00 Local Time Issued by: NWS Chicago IL
Alert Text
...THE NATIONAL WEATHER SERVICE IN CHICAGO IL HAS ISSUED A FLOODWATCH FOR THE FOLLOWING RIVERS IN ILLINOIS...

ILLINOIS RIVER AT OTTAWA AFFECTING LA SALLE ZONE.

...THE FLOOD WATCH IS REPLACED BY A RIVER FLOOD WARNING FOR THE FOLLOWING RIVERS IN ILLINOIS...

ILLINOIS RIVER AT LA SALLE AFFECTING LA SALLE, BUREAU AND PUTNAM ZONES.

FOR THE ILLINOIS RIVER (UPPER)...INCLUDING OTTAWA, LA SALLE... FLOODING IS POSSIBLE.

* WHAT...FLOODING IS POSSIBLE.

* WHERE...ILLINOIS RIVER FROM HERITAGE HARBOR EAST OF OTTAWA DOWNSTREAM TO STARVED ROCK LOCK AND DAM, INCLUDING THE OTTAWA GAUGE.

* WHEN...FROM LATE SATURDAY NIGHT TO EARLY TUESDAY AFTERNOON.

* IMPACTS...AT 464.0 FEET, BACKWATER CAUSES THE FOX RIVER TO REACH BANKFULL NEAR ST. ELIZABETH MEDICAL CENTER IN OTTAWA.

* ADDITIONAL DETAILS... - AT 12:30 PM CDT FRIDAY THE STAGE WAS 461.6 FEET. - FORECAST...FLOOD STAGE MAY BE REACHED EARLY SUNDAY MORNING. - FLOOD STAGE IS 463.0 FEET. - HTTP: WWW.WEATHER.GOV SAFETY FLOOD
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Target Area
LA SALLE

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Hazardous Weather Conditions

No active alerts for CHEVY CHASE, MARYLAND

Current Conditions: CHEVY CHASE, MARYLAND

LEESBURG/GODFREY (KJYO)

Clear

50.0 F
Humidity:58%
Wind Speed:S 5.8 mph
Barometer:30.05 in
Dewpoint:35.6 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 05:35 AM EDT
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5 Day Forecast for CHEVY CHASE, MARYLAND (20815)

Wednesday

High 73 °F
Chance of T-storms
Wednesday
Night
Low 55 °F
Partly Cloudy
Thursday

High 80 °F
Mostly Sunny
Thursday
Night
Low 57 °F
Partly Cloudy
Friday

High 77 °F
Chance of T-storms
Friday
Night
Low 53 °F
Chance of Rain
Saturday

High 62 °F
T-storms Likely
Saturday
Night
Low 48 °F
Rain
Sunday

High 62 °F
Rain Showers Likely

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)
05:35 AM EDT S 5.8 10.00 Clear -- 50.0 35.6 58% NA NA 30.05 1017.6
05:15 AM EDT S 5.8 10.00 Clear -- 50.0 35.6 58% NA NA 30.05 1017.6
04:55 AM EDT S 9.2 10.00 Clear -- 50.0 35.6 58% NA NA 30.05 1017.6
04:35 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.06 1018.0
04:15 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.07 1018.3
03:55 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.08 1018.6
03:35 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.08 1018.6
03:15 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.08 1018.6
02:55 AM EDT S 8.1 10.00 Clear -- 50.0 35.6 58% NA NA 30.09 1019.0
02:35 AM EDT S 6.9 10.00 Clear -- 50.0 35.6 58% NA NA 30.10 1019.3
02:15 AM EDT S 6.9 10.00 Clear -- 50.0 37.4 62% NA NA 30.10 1019.3
01:35 AM EDT 4.7 10.00 Clear -- 51.8 37.4 58% NA NA 30.13 1020.3
01:15 AM EDT 3.4 10.00 Clear -- 51.8 37.4 58% NA NA 30.14 1020.7
12:55 AM EDT 3.4 10.00 Clear -- 51.8 37.4 58% NA NA 30.15 1021.0
12:35 AM EDT S 3.4 10.00 Clear -- 51.8 37.4 58% NA NA 30.15 1021.0
12:15 AM EDT 3.4 10.00 Clear -- 51.8 37.4 58% NA NA 30.15 1021.0
11:55 PM EDT SE 3.4 10.00 Clear -- 53.6 37.4 54% NA NA 30.16 1021.3
11:35 PM EDT SE 4.7 10.00 Clear -- 53.6 37.4 54% NA NA 30.16 1021.3
11:15 PM EDT SE 4.7 10.00 Clear -- 53.6 37.4 54% NA NA 30.17 1021.7
10:55 PM EDT SE 5.8 10.00 Clear -- 53.6 37.4 54% NA NA 30.17 1021.7
10:35 PM EDT 8.1 10.00 Clear -- 53.6 37.4 54% NA NA 30.18 1022.0
10:15 PM EDT 6.9 10.00 Clear -- 55.4 35.6 47% NA NA 30.18 1022.0
09:55 PM EDT 9.2 10.00 Clear -- 55.4 35.6 47% NA NA 30.18 1022.0
09:35 PM EDT SE 11.4 10.00 Clear -- 57.2 32.0 38% NA NA 30.18 1022.0

Regional Weather Observation

LEESBURG/GODFREY (KJYO)

Clear
50.0 F

FREDERICK (KFDK)

Mostly Cloudy
45.1 F

CARROLL CNTY (KDMW)

Clear
51.8 F

NSF THURMONT (KRSP)

Clear
48.0 F

WASH DC/DULLES (KIAD)

Clear
51.8 F

WASHINGTON/NATL (KDCA)

Clear
51.8 F
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