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 Montgomery Cnty(C+SE), MD
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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
Upper level low pressure will drift over the area through Saturday, bringing below normal temperatures, gusty winds, and accumulating mountain snow. High pressure briefly returns Sunday before another area of low pressure and front impacts the area early next week. The weather pattern looks to remain active heading towards the Thanksgiving holiday.

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-Nov-2024 4:20am - next update at 4:30am  
Temperature Summary Outlook
Currently: 39.7, Max: 45.4, Min: 39.7 39.7°F
Colder 1.6°F than last hour.

Cold

Feels like: 40°F

24-hr difference
-12.4°FColder 12.4°F than yesterday at this time.
  Today Yesterday
High: 45.4°F
12:00am 		65.2°F
2:24pm
Low: 39.7°F
4:14am 		45.4°F
11:58pm
High & Low November 2024
High:  83.8°F
06 November at 1:31 PM
Low:  29.0°F
13 November at 7:17 AM
Max Min:  62.9°F
06 November
Min Max:  50.7°F
14 November
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 November
High:  83.8°F
at 1:31 PM on 06 November 2024
Low:  14.5°F
at 7:01 AM on 19 November 2014
Max Min:  65.5°F
at 5:48 AM on 06 November 2022
Min Max:  34.0°F
at 2:22 PM on 23 November 2018
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:  39.7°F
Coldest Wind Chill
Today:  37.6°F
at 12:44am
Yesterday:  38.8°F
at 11:36pm
November 2024  28.0°F
13 November at 8:07 AM
2024  3.7°F
17 January at 9:00 AM
Station November  14.0°F
at 7:47 AM on 13 November 2019
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: 4.0 Degree Days
Yesterday: 9.0 Degree Days
Cooling Degree Days
Today: 0.0 Degree Days
Yesterday: 0.0 Degree Days
Heat Index
Now:  39.7°F
Warmest Heat Index
Today:  45.4°F
at 00:00
Yesterday:  65.2°F
at 14:24
November 2024  86.4°F
06 November at 1:31 PM
2024  122.8°F
16 July at 2:48 PM
Station Record November  86.4°F
at 1:31 PM on 06 November 2024
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
Clear Clear
Wind from WNW WNW
0.0
Gust:
 1.0 mph
0 Bft - Calm
Today: 13.0 mph 12:44am
Gust Month: 21.0 mph November 16
Rain Today:  0.00 in
Rain Rate /hr  0.00 in
Rain Last Hour:  0.00 in
Rain 24hrs:  0.65 in
Wind

Station High November 2024
High Gust:  21.0 mph
16 November at 9:15 AM
High Average:  6.9 mph
20 November at 8:52 PM
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 November
High Gust:  30.1 mph
at 6:10 PM on 20 November 2016
High Average:  18.3 mph
at 8:53 AM on 01 November 2013
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:  4.8 miles
Yesterday:  20.1 miles
Highest Wind Run
November 2024  53.6 miles
16 November
2024  106.4 miles
28 February
November  188.5 miles
on 20 November 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: 0.65 in
This Month: 1.25 in
Season Total: 25.45 in
1 day since last rain.

Days Since Last Dry Day: 2
Station High November 2024
High Day:  0.65 in
20 November
High Hour:  0.57 in
20 November at 8:47 PM
High Rain Rate /hr:  3.25 in
20 November at 7:53 PM
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 November
High Day:  1.73 in
on 21 November 2023
High Hour:  0.78 in
at 9:37 PM on 02 November 2018
High Rain Rate /hr:  6.19 in
at 9:29 PM on 02 November 2018
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
Overnight

Overnight: Mostly Clear
Mostly Clear
Thursday

Thursday: Partly Sunny then Slight Chance Light Rain
Partly Sunny then Slight Chance Light Rain
Thursday
Night
Thursday Night: Slight Chance Light Rain then Partly Cloudy
Slight Chance Light Rain then Partly Cloudy
Lo 38 °F Hi 49 °F Lo 33 °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: 77 % Increased 5.0% since last hour.
Dew Point: 33.1°F Decreased 0.1°F since last hour.
Barometer: 29.704 inHg  
Baro Trend: Falling slowly
Today
Pressure High:  29.733 in
Pressure Low:  29.700 in
Dewpoint High:  40.5 °F
Dewpoint Low:  32.8 °F
Humidity High:  83%
Humidity Low:  69%
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: 6:59am
Sunset: 4:52pm
Moonset: 12:26pm
Moonrise: 10:37pm

Day Length:  09:53
Dawn:  06:30
Dusk:  17:21
Daylight Length:  10:51
 There will be 1min 39s less daylight tomorrow

Cloud Base

cloudbase
CB: 1500 ft
UV Index

   0.0   
None
High: 0.0 @ 12:00am

Solar Radiation
0 W/m2
High: 0 @  12:00am

Air Quality Index
Current AQI
3
Good

Sunlight

9 hrs 52 min 34 sec
of Sunlight Today
Which is
1 min 37 sec Shorter
Than Yesterday
(Noon) graph (Midnight)
 Legend

Moon


Waning Gibbous
Waning Gibbous, Moon at 19 days in cycle
66% %
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: Overnight & Thursday
Overnight

Overnight: Mostly Clear
Mostly Clear

Lo 38 °F		 NWS forecast: Mostly clear, with a low around 38. Northwest wind 8 to 13 mph, with gusts as high as 20 mph. New rainfall amounts less than a tenth of an inch possible.
Davis VP+ forecast: Mostly cloudy and cooler. Precipitation possible within 12 hours, possibly heavy at times. Windy.		   Thursday

Thursday: Partly Sunny then Slight Chance Light Rain
Partly Sunny then Slight Chance Light Rain

Hi 49 °F		 NWS forecast: A slight chance of rain after 1pm. Partly sunny, with a high near 49. West wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
 NWS Weather Forecast  - Five Day Outlook for Overnight through Sunday Night - Last Update: Thu, 21-Nov-2024 3:33am EST
Overnight

Overnight: Mostly Clear
Mostly Clear
Thursday

Thursday: Partly Sunny then Slight Chance Light Rain
Partly Sunny then Slight Chance Light Rain
Thursday
Night
Thursday Night: Slight Chance Light Rain then Partly Cloudy
Slight Chance Light Rain then Partly Cloudy
Friday

Friday: Chance Light Snow then Rain And Snow Likely
Chance Light Snow then Rain And Snow Likely
Friday
Night
Friday Night: Light Rain Likely
Light Rain Likely
Saturday

Saturday: Mostly Sunny
Mostly Sunny
Saturday
Night
Saturday Night: Partly Cloudy
Partly Cloudy
Sunday

Sunday: Mostly Sunny
Mostly Sunny
Sunday
Night
Sunday Night: Partly Cloudy
Partly Cloudy
Lo 38 °F Hi 49 °F Lo 33 °F Hi 43 °F Lo 38 °F Hi 54 °F Lo 41 °F Hi 56 °F Lo 35 °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

Astronomy
One day on Uranus is 18 hours

Today in Weather History

Weather History for November 21
 
1798
A four day storm was in progress in the northeastern U.S. The storm dropped a foot of snow on New York City and New Haven, and as much as three feet in Maine and New Hampshire. The snowstorm ushered in a long and severe winter, in some places the ground remained covered with snow until the following May. (David Ludlum)
1987
Squalls in the Lower Great Lakes Region and the Upper Ohio Valley produced 14 inches of snow at Snowshoe WV, and nearly eight inches at Syracuse NY. Eleven cities in the eastern U.S. reported record low temperatures for the date. Record lows included 21 degrees at Pinson AL, 9 degrees at Syracuse NY, and 8 degrees at Binghamton NY. Gale force winds lash the Middle and Northern Atlantic Coast, and the strong northwesterly winds produced wind chill readings as cold as 30 degrees below zero. Winds gusting to 60 mph at Trumansburg NY toppled a chimney onto a nearby truck. (The National Weather Summary) (Storm Data)