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Test Message TEST MESSAGE - Montgomery Cnty(C+SE), MD  - Montgomery Cnty(NW), MD

WASHINGTON DC METRO AREA FORECAST DISCUSSION
Dense Fog Advisory is in effect for portions of western MD and eastern WV until 8 AM, primarily for the valleys. Made substantial changes to the aviation section to account for less low clouds this morning.

Current DC Area Radar & North America Lightning


Northeast US Radar

Regional Radar

North America Lightning

North America Lightning Strikes
Radar image courtesy of NWS. Lightning Data courtesy of Blitzortung.org and its Contributors.
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Current Clifton Virginia Conditions & NWS Forecast

Updated: @ 21-Aug-2026 12:10pm - next update at 12:20pm  
Temperature Summary Outlook
Currently: 78.7, Max: 78.7, Min: 63.4 78.7°F
Warmer 3.0°F than last hour.

Comfortable

Feels like: 79°F

24-hr difference
-4.2°FColder 4.2°F than yesterday at this time.
  Today Yesterday
High: 78.7°F
12:08pm 		89.9°F
2:38pm
Low: 63.4°F
7:06am 		69.1°F
11:59pm
High & Low August 2026
High:  95.5°F
08 August at 2:53 PM
Low:  63.4°F
21 August at 7:06 AM
Max Min:  74.8°F
14 August
Min Max:  80.1°F
16 August
High and Low 2026
High:  101.6°F
04 July at 3:01 PM
Low:  5.2°F
27 January at 7:52 AM
Max Min:  77.9°F
16 July
Min Max:  18.4°F
25 January
Record August
High:  101.9°F
at 15:51 on 02 August 2024
Low:  50.4°F
at 06:59 on 21 August 2024
Max Min:  77.5°F
at 06:27 on 13 August 2016
Min Max:  67.3°F
at 16:48 on 29 August 2017
Station All Time Record
High:  101.9°F
at 15:51 on 02 August 2024
Low:  1.0°F
at 07:23 on 23 January 2014
Max Min:  78.1°F
at 06:58 on 23 June 2024
Min Max:  16.7°F
at 12:04 on 16 February 2015
Records began on 24 December 2012
Wind Chill
Now:  78.7°F
Coldest Wind Chill
Today:  63.4°F
at 7:06am
Yesterday:  69.1°F
at 11:59pm
August 2026  63.4°F
21 August at 7:06 AM
2026  2.9°F
01 February at 8:34 AM
Station August  50.4°F
at 06:59 on 21 August 2024
Station All Time  °F
Records began on 24 December 2012
Degree Days
Heating Degree Days
Today: 0.1 Degree Days
Yesterday: 0.0 Degree Days
Cooling Degree Days
Today: 1.8 Degree Days
Yesterday: 11.6 Degree Days
Heat Index
Now:  78.7°F
Warmest Heat Index
Today:  78.7°F
at 12:08
Yesterday:  107.6°F
at 14:30
August 2026  117.4°F
06 August at 2:54 PM
2026  128.9°F
04 July at 3:04 PM
Station Record August  120.1°F
at 15:58 on 12 August 2021
Station All Time  128.9°F
at 15:04 on 04 July 2026
Records began on 24 December 2012
WeatherCam Thumbnail
North North West Camera
North North West WeatherCam
Mostly cloudy Mostly cloudy
Wind from NW NW
1
Gust:
 3 mph
0 Bft - Calm
Today: 9 mph 8:02am
Gust Month: 23 mph August 10
Rain Today:  0.00 in
Rain Rate /hr  0.00 in
Rain Last Hour:  0.00 in
Rain 24hrs:  0.46 in
Wind

Station High August 2026
High Gust:  23 mph
10 August at 4:35 PM
High Average:  7 mph
10 August at 4:40 PM
Station High 2026
High Gust:  29 mph
07 February at 10:28 AM
High Average:  10 mph
12 March at 11:03 AM
Station Record August
High Gust:  32 mph
at 21:02 on 19 August 2017
High Average:  12 mph
at 14:57 on 21 August 2016
Station All Time Record
High Gust:  42 mph
at 12:56 on 04 January 2018
High Average:  24 mph
at 13:07 on 02 March 2018
Records began on 24 December 2012
Wind Run

Today:  9.9 miles
Yesterday:  18.0 miles
Highest Wind Run
August 2026  18.0 miles
20 August
2026  101.4 miles
07 February
August  91.3 miles
on 05 August 2017
Station All Time  284.2 miles
on 02 March 2018
Records began on 24 December 2012

Rain
Rain Today: 0.00 in
Rain Rate (/hr): 0.00 in
Rain Yesterday: 0.50 in
This Month: 4.47 in
Season Total: 19.52 in
1 day since last rain.

Days Since Last Dry Day: 1
Station High August 2026
High Day:  0.77 in
16 August
High Hour:  0.66 in
06 August at 7:13 PM
High Rain Rate /hr:  6.94 in
10 August at 4:38 PM
Station High 2026
High Day:  1.35 in
16 March
High Hour:  0.78 in
16 March at 1:42 PM
High Rain Rate /hr:  6.94 in
10 August at 4:38 PM
Station Record August
High Day:  3.20 in
on 01 August 2018
High Hour:  6.61 in
at 14:09 on 04 August 2017
High Rain Rate /hr:  6.94 in
at 16:38 on 10 August 2026
Station All Time Record
High Day:  5.17 in
on 21 July 2018
High Hour:  2.21 in
at 16:13 on 22 July 2020
High Rain Rate /hr:  64.00 in
at 10:49 on 19 October 2021
High Month:  10.27 in
July 2018
Records began on 24 December 2012
WeatherCam Thumbnail
South South West Camera
South South West WeatherCam
Today

Today: Mostly Sunny
Mostly Sunny
Tonight

Tonight: Mostly Cloudy then Chance Showers And Thunderstorms
Mostly Cloudy then Chance Showers And T-Storms
Saturday

Saturday: Patchy Fog
Patchy Fog
Hi 82 °F Lo 66 °F Hi 79 °F
Lightning VA MD DC WV DE

Viginia Lighting
Radar Washington DC Metro Area

  GRLevel3 radar from NWS station KLWX

Storm Prediction Center Activity Chart

SPC Activity

Humidity & Barometer
Humidity: 64 % Decreased 4.0% since last hour.
Dew Point: 65.5°F Decreased 0.3°F since last hour.
Barometer: 30.12 inHg  
Baro Trend: Rising slowly
Today
Pressure High:  30.09 in
Pressure Low:  29.99 in
Dewpoint High:  33.1 °F
Dewpoint Low:  19.6 °F
Humidity High:  80%
Humidity Low:  40%
Station Record
Pressure High:  31.41 in
at 12:14 on 23 March 2017
Pressure Low:  28.99 in
at 07:41 on 07 February 2020
Dewpoint High:  82.7 °F
at 11:55 on 05 July 2024
Dewpoint Low:  -27.0 °F
at 01:57 on 20 February 2015
Records began on 24 December 2012
Snow

Snow Depth: 0.0 in
Snowfall Today: No Snow Today
Storm Total: 0.0 in
Total Season Snow: 13.0 in
Total Last Season: 15.5 in
Fire Danger
firedanger
Almanac
Sunrise: 6:27am
Sunset: 7:57pm
Moonset: 12:02am
Moonrise: 3:55pm

Day Length:  13:27
Dawn:  06:01
Dusk:  20:24
Daylight Length:  14:22
 There will be 2min 18s less daylight tomorrow

Cloud Base

cloudbase
CB AGL: 3208 ft
UV Index

   6.0   
 High 
High: 6.3 @ 11:53am

Solar Radiation
889 W/m2
High: 993 @  11:54am

Air Quality Index
Current AQI
32
Good

Sunlight

13 hrs 30 min 2 sec
of Sunlight Today
Which is
2 min 18 sec Shorter
Than Yesterday
(Noon) graph (Midnight)
 Legend

Moon


Waxing Gibbous
Waxing Gibbous, Moon at 8 days in cycle
65% %
Illuminated
 NWS Weather Forecast  - Outlook: Today & Tonight
Today

Today: Mostly Sunny
Mostly Sunny

Hi 82 °F		 NWS forecast: Mostly sunny, with a high near 82. North wind around 6 mph.
Davis VP+ forecast: Increasing clouds with little temperature change. Precipitation possible within 24 to 48 hours.		   Tonight

Tonight: Mostly Cloudy then Chance Showers And Thunderstorms
Mostly Cloudy then Chance Showers And T-Storms

Lo 66 °F		 NWS forecast: A chance of showers and thunderstorms between 2am and 3am, then patchy fog and showers and thunderstorms likely. Mostly cloudy, with a low around 66. East wind around 3 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
 NWS Weather Forecast  - Five Day Outlook for Today through Tuesday - Last Update: Fri, 21-Aug-2026 10:52am EDT
Today

Today: Mostly Sunny
Mostly Sunny
Tonight

Tonight: Mostly Cloudy then Chance Showers And Thunderstorms
Mostly Cloudy then Chance Showers And T-Storms
Saturday

Saturday: Patchy Fog
Patchy Fog
Saturday
Night
Saturday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Sunday

Sunday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Sunday
Night
Sunday Night: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear
Monday

Monday: Sunny
Sunny
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
Tuesday

Tuesday: Sunny
Sunny
Hi 82 °F Lo 66 °F Hi 79 °F Lo 66 °F Hi 83 °F Lo 63 °F Hi 82 °F Lo 61 °F Hi 81 °F

NWS Forecast Maps

NOAA Forecast Map for Today

Forecast Map for Today

NOAA Forecast Map for Tomorrow

Forecast Map for Tomorrow
Forecast map for Today courtesy of NOAA. Forecast map for Tomorrow courtesy of NOAA.

Random Weather Facts

Extremes
The longest period without measurable rainfall in the United States was 767 days at Bagdad, California.

Today in Weather History

Weather History for August 21
 
1984   Thunderstorms dropped 6 to 13 inches of rain at Tulsa, OK in 6 hours. The flooding claimed 14 lives and caused $90 million in property damage. 4600 cars, 743 houses, and 387 apartments were destroyed or severely damaged in the flood.
1967   A slow moving nor'easter battered New England with high winds, heavy rain, and record late season snow. Winds 70 to 90 mph in gusts occurred along the coast. Over 7 inches of rain fell at Nantucket, MS with 6.57 inches falling in 24 hours to set a new 24 hour rainfall record. 24.9 inches of snow fell at Mount Washington, NH to set a new May snowfall record.