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FLASH FLOOD WATCH
FLASH FLOOD WATCH ISSUED APRIL 18 AT 3:49PM CDT UNTIL APRIL 19 AT 7:00AM CDT
Effective: 2026-04-18 15:49:00 Local Time Expires: 2026-04-19 07:00:00 Local Time Issued by: NWS Milwaukee/Sullivan WI
Alert Text
* WHAT...FLASH FLOODING DUE TO THE POTENTIAL COMPROMISE OF THECALEDONIA-LEWISTON LEVEE. THE WISCONSIN DEPARTMENT OF NATURAL RESOURCES HAS INDICATED THAT THE CALENDONIA-LEWISTON LEVEE ALONG THE WISCONSIN RIVER MAY BECOME COMPROMISED AS THE RIVER LEVELS RISE. IF THIS TAKES PLACE, A RAPID INUNDATION OF WATER IS EXPECTED ALONG THE SOUTH AND WEST SIDE OF THE RIVER. THE CITY OF PORTAGE IS NOT ANTICIPATED TO BE IMPACTED BY A POTENTIAL COMPROMISE OF THE CALEDONIA-LEWISTON LEVEE.

* WHERE...A PORTION OF SOUTH CENTRAL WISCONSIN, INCLUDING THE FOLLOWING COUNTIES, COLUMBIA AND SAUK ALONG THE SOUTH AND WEST SIDE OF THE WISCONSIN RIVER. AREAS AFFECTED INCLUDE, BUT ARE NOT LIMITED TO THE PINE ISLAND STATE WILDLIFE AREA AND PORTIONS OF HIGHWAY 33. THE CITY OF PORTAGE IS NOT ANTICIPATED TO BE IMPACTED BY A POTENTIAL COMPROMISE OF THE CALEDONIA-LEWISTON LEVEE.

* WHEN...THROUGH SUNDAY MORNING.

* IMPACTS...A COMPROMISED LEVEE MAY RESULT IN FLASH FLOODING OF LOW-LYING AREAS ALONG THE CALEDONIA-LEWISTON LEVEE.

* ADDITIONAL DETAILS... - EXCESSIVE RAINFALL OVER THE PAST SEVERAL DAYS HAS RESULTED IN VERY HIGH WATER LEVEL ON THE WISCONSIN RIVER. - HTTP: WWW.WEATHER.GOV SAFETY FLOOD
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Target Area
SAUK, COLUMBIA
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Hazardous Weather Conditions

No active alerts for CHEVY CHASE, MARYLAND

Current Conditions: CHEVY CHASE, MARYLAND

LEESBURG/GODFREY (KJYO)

NULL

69.8 F
Humidity:73%
Wind Speed:E 4.7 mph
Barometer:29.85 in
Dewpoint:60.8 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 18 2026, 11:15 PM EDT
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5 Day Forecast for CHEVY CHASE, MARYLAND (20815)

Saturday

High 84 °F
Forecast Missing
Saturday
Night
Low 50 °F
Rain Likely
Sunday

High 59 °F
Rain Showers Likely
Sunday
Night
Low 42 °F
Partly Cloudy
Monday

High 55 °F
Partly Sunny
Monday
Night
Low 33 °F
Mostly Clear
Tuesday

High 59 °F
Mostly Sunny
Tuesday
Night
Low 48 °F
Slight Chance of Rain
Wednesday

High 73 °F
Chance of Rain Showers

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)
11:15 PM EDT E 4.7 10.00 NULL -- 69.8 60.8 73% NA NA 29.85 1010.8
10:55 PM EDT 4.7 10.00 Cloudy -- 69.8 60.8 73% NA NA M
10:35 PM EDT 5.8 10.00 Mostly Cloudy -- 69.8 60.8 73% NA NA 29.83 1010.2
10:15 PM EDT SE 5.8 10.00 Mostly Cloudy -- 69.8 60.8 73% NA NA 29.82 1009.8
09:55 PM EDT SE 10.3 10.00 Clear -- 69.8 60.8 73% NA NA 29.82 1009.8
09:35 PM EDT SE 9.2 10.00 Clear -- 71.6 60.8 69% NA 71.8 29.83 1010.2
09:15 PM EDT SE 11.4 10.00 Clear -- 71.6 60.8 69% NA 71.8 29.82 1009.8
08:55 PM EDT SE 11.4 G 23.0 10.00 Clear -- 71.6 60.8 69% NA 71.8 29.82 1009.8
08:35 PM EDT SE 13.9 G 20.8 10.00 Clear -- 73.4 60.8 65% NA 73.4 29.81 1009.5
08:15 PM EDT SE 9.2 G 18.3 10.00 Clear -- 73.4 60.8 65% NA 73.4 29.81 1009.2
07:55 PM EDT SE 15.0 G 20.8 10.00 Clear -- 75.2 60.8 61% NA 75.2 29.81 1009.2
07:35 PM EDT SE 11.4 G 18.3 10.00 Clear -- 77.0 60.8 57% NA 77.2 29.81 1009.2
07:15 PM EDT SE 12.8 G 19.7 10.00 Clear -- 77.0 62.6 61% NA 77.4 29.81 1009.5
06:55 PM EDT SE 12.8 G 18.3 10.00 Clear -- 78.8 62.6 58% NA 79.2 29.81 1009.5
06:35 PM EDT G 19.7 10.00 Clear -- 78.8 62.6 58% NA 79.2 29.82 1009.8
06:15 PM EDT SE 12.8 10.00 Clear -- 78.8 62.6 58% NA 79.2 29.83 1010.2
05:55 PM EDT 15.0 G 23.0 10.00 Clear -- 78.8 62.6 58% NA 79.2 29.83 1010.2
05:35 PM EDT 10.3 G 20.8 10.00 Partly Cloudy -- 80.6 62.6 54% NA 81.9 29.83 1010.2
05:15 PM EDT SE 13.9 10.00 NULL -- 80.6 62.6 54% NA 81.9 29.83 1010.2
04:55 PM EDT 9.2 G 16.1 10.00 Clear -- 80.6 62.6 54% NA 81.9 29.83 1010.2
04:35 PM EDT SE 13.9 G 21.9 10.00 Clear -- 82.4 60.8 48% NA 82.9 29.84 1010.5
04:15 PM EDT SE 10.3 G 18.3 10.00 Clear -- 82.4 59.0 45% NA 82.4 29.84 1010.5
03:55 PM EDT SE 8.1 G 17.2 10.00 Clear -- 82.4 59.0 45% NA 82.4 29.86 1011.2
03:35 PM EDT 12.8 G 19.7 10.00 Clear -- 82.4 59.0 45% NA 82.4 29.87 1011.5

Regional Weather Observation

LEESBURG/GODFREY (KJYO)

NULL
69.8 F

FREDERICK (KFDK)

Mostly Cloudy
67.3 F

CARROLL CNTY (KDMW)

Mostly Cloudy
60.8 F

NSF THURMONT (KRSP)

Cloudy
61.0 F

WASH DC/DULLES (KIAD)

Mostly Cloudy
69.8 F

WASHINGTON/NATL (KDCA)

Clear
64.4 F
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