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Small Craft Advisory SMALL CRAFT ADVISORY - Tidal Potomac
Test Message TEST MESSAGE - Montgomery Cnty(C+SE), MD  - Montgomery Cnty(NW), MD

WASHINGTON DC METRO AREA FORECAST DISCUSSION
Lingering snow showers in the Alleghenies, with some flurries possible east of the mountains today. Strong Canadian high pressure builds in through Monday, with dry and very cold conditions. Precipitation chances increase as another front approaches during the middle of next week.

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-Dec-2024 1:00pm - next update at 1:10pm  
Temperature Summary Outlook
Currently: 37.0, Max: 37.2, Min: 33.1 37.0°F
Warmer 0.6°F than last hour.

Cold

Feels like: 37°F

24-hr difference
-1.9°FColder 1.9°F than yesterday at this time.
  Today Yesterday
High: 37.2°F
12:35pm 		39.8°F
2:47pm
Low: 33.1°F
12:31am 		32.1°F
12:00am
High & Low December 2024
High:  66.1°F
08 December at 2:49 PM
Low:  19.0°F
04 December at 7:01 AM
Max Min:  42.2°F
10 December
Min Max:  36.7°F
06 December
High and Low 2024
High:  101.9°F
02 August at 3:51 PM
Low:  8.9°F
17 January at 7:32 AM
Max Min:  78.1°F
23 June
Min Max:  26.5°F
20 January
Record December
High:  74.8°F
at 1:41 PM on 13 December 2015
Low:  7.0°F
at 7:34 AM on 24 December 2022
Max Min:  63.0°F
at 11:40 PM on 24 December 2015
Min Max:  21.3°F
at 2:55 PM on 24 December 2022
Station All Time Record
High:  101.9°F
at 3:51 PM on 02 August 2024
Low:  1.0°F
at 7:23 AM on 23 January 2014
Max Min:  78.1°F
at 6:58 AM on 23 June 2024
Min Max:  16.7°F
at 12:04 PM on 16 February 2015
Records began on 24 December 2012
Wind Chill
Now:  37.0°F
Coldest Wind Chill
Today:  25.0°F
at 11:21am
Yesterday:  31.4°F
at 10:09pm
December 2024  17.0°F
06 December at 12:25 AM
2024  3.7°F
17 January at 9:00 AM
Station December  -5.8°F
at 8:46 AM on 24 December 2022
Station All Time  -15.8°F
at 1:57 AM on 21 February 2015
Records began on 24 December 2012
Degree Days
Heating Degree Days
Today: 16.2 Degree Days
Yesterday: 27.9 Degree Days
Cooling Degree Days
Today: 0.0 Degree Days
Yesterday: 0.0 Degree Days
Heat Index
Now:  37.0°F
Warmest Heat Index
Today:  37.2°F
at 12:35
Yesterday:  39.8°F
at 14:47
December 2024  66.1°F
08 December at 2:49 PM
2024  122.8°F
16 July at 2:48 PM
Station Record December  74.8°F
at 1:41 PM on 13 December 2015
Station All Time  122.8°F
at 2:48 PM on 16 July 2024
Records began on 24 December 2012
WeatherCam Thumbnail
North North West Camera
North North West WeatherCam
Mostly cloudy Mostly cloudy
Wind from N N
3.8
Gust:
 11.0 mph
1 Bft - Light air
Today: 18.0 mph 10:11am
Gust Month: 22.0 mph December 11
Rain Today:  0.00 in
Rain Rate /hr  0.00 in
Rain Last Hour:  0.00 in
Rain 24hrs:  0.00 in
Wind

Station High December 2024
High Gust:  22.0 mph
11 December at 2:35 PM
High Average:  7.3 mph
21 December at 11:16 AM
Station High 2024
High Gust:  28.0 mph
10 March at 5:26 PM
High Average:  14.0 mph
12 May at 5:00 PM
Station Record December
High Gust:  35.1 mph
at 1:21 PM on 06 December 2017
High Average:  20.6 mph
at 11:09 AM on 15 December 2016
Station All Time Record
High Gust:  42.2 mph
at 12:56 PM on 04 January 2018
High Average:  24.3 mph
at 1:07 PM on 02 March 2018
Records began on 24 December 2012
Wind Run

Today:  26.7 miles
Yesterday:  7.4 miles
Highest Wind Run
December 2024  55.9 miles
05 December
2024  106.4 miles
28 February
December  166.8 miles
on 18 December 2016
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: 0.00 in
This Month: 1.76 in
Season Total: 27.56 in
3 days since last rain.

Days Since Last Dry Day: 0
Station High December 2024
High Day:  0.98 in
11 December
High Hour:  0.35 in
11 December at 11:28 AM
High Rain Rate /hr:  3.31 in
11 December at 10:53 AM
Station High 2024
High Day:  1.53 in
09 January
High Hour:  0.77 in
03 August at 6:32 PM
High Rain Rate /hr:  9.14 in
10 July at 7:00 PM
Station Record December
High Day:  2.22 in
on 15 December 2018
High Hour:  0.49 in
at 4:34 PM on 24 December 2020
High Rain Rate /hr:  8.73 in
at 4:06 PM on 24 December 2020
Station All Time Record
High Day:  5.17 in
on 21 July 2018
High Hour:  2.21 in
at 4:13 PM on 22 July 2020
High Rain Rate /hr:  64.00 in
at 10:49 AM 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
This
Afternoon
This Afternoon: Scattered Rain And Snow Showers
Scattered Rain And Snow Showers
Tonight

Tonight: Scattered Snow Showers then Mostly Cloudy
Scattered Snow Showers then Mostly Cloudy
Sunday

Sunday: Mostly Sunny
Mostly Sunny
Hi 37 °F Lo 20 °F Hi 31 °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: 48 % Decreased 1.0% since last hour.
Dew Point: 19.1°F Increased 0.1°F since last hour.
Barometer: 30.212 inHg  
Baro Trend: Falling slowly
Today
Pressure High:  30.232 in
Pressure Low:  29.963 in
Dewpoint High:  31.0 °F
Dewpoint Low:  15.7 °F
Humidity High:  88%
Humidity Low:  44%
Station Record
Pressure High:  31.410 in
at 12:14 PM on 23 March 2017
Pressure Low:  28.987 in
at 7:41 AM on 07 February 2020
Dewpoint High:  82.7 °F
at 11:55 AM on 05 July 2024
Dewpoint Low:  -27.0 °F
at 1:57 AM 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: 10.00 in
Total Last Season: 0.0 in
Fire Danger
firedanger
Almanac
Sunrise: 7:23am
Sunset: 4:53pm
Moonset: 11:41am
Moonrise: 11:29pm

Day Length:  09:26
Dawn:  06:55
Dusk:  17:21
Daylight Length:  10:26
 There will be 0min 1s less daylight tomorrow

Cloud Base

cloudbase
CB: 4068 ft
UV Index

   1.3   
 Low 
High: 1.4 @ 11:47am

Solar Radiation
552 W/m2
High: 659 @  12:31pm

Air Quality Index
Current AQI
3
Good

Sunlight

9 hrs 29 min 50 sec
of Sunlight Today
Which is 1 sec Shorter
Than Yesterday
(Noon) graph (Midnight)
 Legend

Moon


Waning Gibbous
Waning Gibbous, Moon at 20 days in cycle
61% %
Illuminated
Trends
These graphs present the temperature, pressure, rainfall, and wind speed trends for the last 24 hours.
The thumbnail graphs are sampled every ten minutes.
The large graphs are sampled every minute.
Weather Graphs
Click on weather description tab below to display the corresponding graph in the panel above.
Wind Graph Thumbnail Wind Direction Thumbnail Temperature Graph Thumbnail Temp Min/Max Graph Thumbnail Humidity Graph Thumbnail Pressure Graph Thumbnail
Today's Rainfall Graph Thumbnail Rain Graph Thumbnail Daily Rain Graph Thumbnail Solar Radiation Graph Thumbnail UV Index Graph Thumbnail Sunshine Hours Graph Thumbnail
 NWS Weather Forecast  - Outlook: This Afternoon & Tonight
This
Afternoon
This Afternoon: Scattered Rain And Snow Showers
Scattered Rain And Snow Showers

Hi 37 °F		 NWS forecast: Scattered rain and snow showers after 1pm. Partly sunny, with a high near 37. Northwest wind 16 to 20 mph, with gusts as high as 33 mph.
Davis VP+ forecast: Partly cloudy with little temperature change.		   Tonight

Tonight: Scattered Snow Showers then Mostly Cloudy
Scattered Snow Showers then Mostly Cloudy

Lo 20 °F		 NWS forecast: Scattered snow showers before 7pm. Mostly cloudy, with a low around 20. Northwest wind 7 to 14 mph, with gusts as high as 22 mph.
 NWS Weather Forecast  - Five Day Outlook for This Afternoon through Christmas Day - Last Update: Sat, 21-Dec-2024 12:30pm EST
This
Afternoon
This Afternoon: Scattered Rain And Snow Showers
Scattered Rain And Snow Showers
Tonight

Tonight: Scattered Snow Showers then Mostly Cloudy
Scattered Snow Showers then Mostly Cloudy
Sunday

Sunday: Mostly Sunny
Mostly Sunny
Sunday
Night
Sunday Night: Mostly Clear
Mostly Clear
Monday

Monday: Sunny
Sunny
Monday
Night
Monday Night: Mostly Cloudy
Mostly Cloudy
Tuesday

Tuesday: Chance Light Snow
Chance Light Snow
Tuesday
Night
Tuesday Night: Slight Chance Rain And Snow then Mostly Cloudy
Slight Chance Rain And Snow then Mostly Cloudy
Christmas
Day
Christmas Day: Partly Sunny
Partly Sunny
Hi 37 °F Lo 20 °F Hi 31 °F Lo 11 °F Hi 35 °F Lo 25 °F Hi 44 °F Lo 28 °F Hi 43 °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

Weather Terms
Flood Watch - Conditions are favorable for flash flooding in and close to the watch area. These watches are issued by the Weather Forecast Office in Sterling, VA and are usually for the first 12 to 24 hours of a forecast.

Today in Weather History

Weather History for December 21
 
1929
An exceptional storm produced snow from the Middle Rio Grande Valley of Texas to southern Arkansas. The storm produced 26 inches of snow at Hillsboro TX, 18 inches at El Dorado AR, and 14 inches at Bossier LA. (21st-22nd) (David Ludlum) (The Weather Channel)
1989
Forty cities in the north central U.S., including thirteen in Iowa, reported record low temperatures for the date. Havre and Jordan, MT, tied for honors as the cold spot in the nation with morning lows of 43 degrees below zero, and the temperature remained close to 40 degrees below zero through the daylight hours. Dickinson ND reported a morning low of 33 degrees below zero and a wind chill reading of 86 degrees below zero. The high for the date of 16 degrees below zero at Sioux Falls SD was December record for that location. (The National Weather Summary)