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AIR QUALITY ALERT
AIR QUALITY ALERT ISSUED APRIL 22 AT 4:49PM EDT
Effective: 2026-04-22 16:49:00 Local Time Expires: 2026-04-23 20:00:00 Local Time Issued by: NWS Columbia SC
THE SOUTH CAROLINA DEPARTMENT OF ENVIRONMENTAL SERVICESIN COLUMBIA SC HAS ISSUED A CODE ORANGE OZONE ACTION DAY FOR THE CENTRAL MIDLANDS REGION OF SOUTH CAROLINA IN EFFECT FROM 10 AM TO 8 PM EDT THURSDAY.

STAGNANT HIGH PRESSURE WILL BRING ANOTHER DAY OF LOW HUMIDITY AND VERY WARM TEMPERATURES TO REGION ON THURSDAY. AS THERE IS ALREADY A CONSIDERABLE LEVEL OF POLLUTANTS IN THE ATMOSPHERE, ANOTHER DAY OF THESE CONDITIONS WILL RESULT IN SIGNIFICANT OZONE PRODUCTION ON THURSDAY. WILDFIRE SMOKE MAY ALSO HELP TO INCREASE OZONE CONCENTRATIONS ACROSS PARTS OF THE REGION.

ALL THE REMAINING SOUTH CAROLINA FORECAST ZONES ARE PREDICTED TO HAVE GROUND-LEVEL OZONE PEAKS IN THE YELLOW CATEGORY.

AN OZONE ACTION DAY MEANS THAT ATMOSPHERIC CONDITIONS WILL LIKELY PRODUCE UNHEALTHY CONCENTRATIONS OF GROUND LEVEL OZONE AIR POLLUTION. A CODE ORANGE FORECAST INDICATES THAT GROUND LEVEL OZONE CONCENTRATIONS ARE EXPECTED TO BE UNHEALTHY FOR SENSITIVE GROUPS, WHICH INCLUDES PEOPLE WITH LUNG DISEASE, OLDER ADULTS, AND CHILDREN. SENSITIVE GROUPS SHOULD REDUCE PROLONGED OR HEAVY OUTDOOR EXERTION, TAKE MORE BREAKS, AND DO LESS INTENSE ACTIVITIES, ESPECIALLY DURING AFTERNOON AND EARLY EVENING HOURS. YOU CAN HELP PREVENT OZONE POLLUTION BY WALKING OR RIDING YOUR BICYCLE, TAKING YOUR LUNCH TO WORK, REDUCING IDLING, CONSERVING ENERGY, AND KEEPING YOUR VEHICLE PROPERLY TUNED. FOR ADDITIONAL INFORMATION, PLEASE VISIT THE SCDES WEBSITE AT HTTP: WWW.DES.SC.GOV OZONE OR THE ENVIRONMENTAL PROTECTION AGENCY AIRNOW WEBSITE AT HTTPS: WWW.AIRNOW.GOV.

SOUTH CAROLINA AIR QUALITY FORECAST: DES.SC.GOV AIRQUALITYFORECAST
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Hazardous Weather Conditions

No active alerts for CHEVY CHASE, MARYLAND

Current Conditions: CHEVY CHASE, MARYLAND

LEESBURG/GODFREY (KJYO)

Partly Cloudy

77.0 F

Humidity:41%
Wind Speed: G 19.7 mph
Barometer:29.92 in
Dewpoint:51.8 F
Visibility:10.00 mi
Precip:--
Heat Index:76.3 F
Wind Chill:NA
Apr 22 2026, 05:35 PM EDT
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5 Day Forecast for CHEVY CHASE, MARYLAND (20815)

Wednesday

High 75 °F
Scattered T-storms Likely
Wednesday
Night
Low 55 °F
Partly Cloudy

Thursday

High 80 °F
Mostly Sunny

Thursday
Night
Low 59 °F
Partly Cloudy

Friday

High 80 °F
Chance of T-storms

Friday
Night
Low 55 °F
Chance of Rain
Saturday

High 62 °F
T-storms


Saturday
Night
Low 48 °F
Rain

Sunday

High 64 °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 PM EDT G 19.7 10.00 Partly Cloudy -- 77.0 51.8 41% NA 76.3 29.92 1013.2
05:15 PM EDT 11.4 G 18.3 10.00 Mostly Cloudy -- 77.0 53.6 44% NA 76.5 29.92 1013.2
04:55 PM EDT 5.8 10.00 Partly Cloudy -- 73.4 51.8 47% NA 72.7 29.92 1013.2
04:35 PM EDT S 10.3 10.00 Mostly Cloudy -- 75.2 53.6 47% NA 74.7 29.94 1013.6
04:15 PM EDT 8.1 10.00 Cloudy -- 73.4 51.8 47% NA 72.7 29.94 1013.6
03:55 PM EDT 9.2 10.00 Cloudy -- 73.4 51.8 47% NA 72.7 29.94 1013.6
03:35 PM EDT 6.9 10.00 NULL -- 73.4 51.8 47% NA 72.7 29.94 1013.9
03:15 PM EDT S 8.1 10.00 Partly Cloudy -- 77.0 51.8 41% NA 76.3 29.95 1014.2
02:55 PM EDT S 8.1 10.00 Clear -- 75.2 53.6 47% NA 74.7 29.96 1014.6
02:35 PM EDT 8.1 10.00 Clear -- 73.4 51.8 47% NA 72.7 29.97 1014.9
02:15 PM EDT S 8.1 10.00 Clear -- 71.6 51.8 50% NA 70.9 29.98 1015.2
01:55 PM EDT 6.9 10.00 Clear -- 69.8 50.0 49% NA NA 30.00 1015.9
01:35 PM EDT S 5.8 10.00 Clear -- 68.0 48.2 49% NA NA 30.01 1016.3
01:15 PM EDT 3.4 10.00 Clear -- 66.2 46.4 49% NA NA 30.01 1016.3
12:35 PM EDT 3.4 10.00 Partly Cloudy -- 62.6 46.4 55% NA NA 30.03 1016.9
12:15 PM EDT S 4.7 10.00 Partly Cloudy -- 62.6 46.4 55% NA NA 30.04 1017.3
11:55 AM EDT 4.7 10.00 Partly Cloudy -- NULL 46.4 % NA NA 30.04 1017.3
11:35 AM EDT 3.4 10.00 Partly Cloudy -- 59.0 46.4 63% NA NA 30.05 1017.6
11:15 AM EDT SE 4.7 10.00 Cloudy -- 55.4 46.4 72% NA NA 30.05 1017.6
10:35 AM EDT 0.0 10.00 Cloudy -- 55.4 42.8 62% NA NA 30.06 1018.0
10:15 AM EDT 0.0 10.00 Cloudy -- 53.6 42.8 67% NA NA 30.06 1018.0
09:55 AM EDT 0.0 10.00 Cloudy -- 53.6 42.8 67% NA NA 30.05 1017.6
09:35 AM EDT SW 3.4 10.00 Cloudy -- 53.6 42.8 67% NA NA 30.06 1018.0
09:15 AM EDT SW 3.4 10.00 Partly Cloudy -- 53.6 41.0 62% NA NA 30.06 1018.0

Regional Weather Observation

LEESBURG/GODFREY (KJYO)

Partly Cloudy
77.0 F

FREDERICK (KFDK)

Partly Cloudy
77.0 F

CARROLL CNTY (KDMW)

Partly Cloudy
75.2 F

NSF THURMONT (KRSP)

Partly Cloudy
69.1 F

WASH DC/DULLES (KIAD)

Partly Cloudy
77.0 F

WASHINGTON/NATL (KDCA)

Partly Cloudy
73.4 F
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