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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
The Small Craft Advisory was extended through 1 PM. PROB30 groups with -TSRA were introduced for this afternoon at many of the TAF sites.

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: @ 20-Sep-2026 4:20am - next update at 4:30am  
Temperature Summary Outlook
Currently: 70.7, Max: 71.9, Min: 70.6 70.7°F
Colder 0.4°F than last hour.

Comfortable

Feels like: 71°F

24-hr difference
4.6°FWarmer 4.6°F than yesterday at this time.
  Today Yesterday
High: 71.9°F
12:00am 		81.4°F
2:43pm
Low: 70.6°F
4:19am 		65.0°F
7:09am
High & Low September 2026
High:  95.7°F
01 September at 2:41 PM
Low:  52.3°F
15 September at 7:08 AM
Max Min:  73.9°F
02 September
Min Max:  79.4°F
15 September
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 September
High:  101.5°F
at 15:56 on 06 September 2023
Low:  40.2°F
at 07:12 on 22 September 2020
Max Min:  73.9°F
at 04:46 on 04 September 2018
Min Max:  60.0°F
at 15:53 on 30 September 2022
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:  70.7°F
Coldest Wind Chill
Today:  70.6°F
at 4:19am
Yesterday:  65.0°F
at 7:09am
September 2026  52.3°F
15 September at 7:08 AM
2026  2.9°F
01 February at 8:34 AM
Station September  38.3°F
at 07:38 on 20 September 2020
Station All Time  °F
Records began on 24 December 2012
Degree Days
Heating Degree Days
Today: 0.0 Degree Days
Yesterday: 0.0 Degree Days
Cooling Degree Days
Today: 1.2 Degree Days
Yesterday: 7.6 Degree Days
Heat Index
Now:  70.7°F
Warmest Heat Index
Today:  71.9°F
at 00:00
Yesterday:  85.0°F
at 14:43
September 2026  117.5°F
02 September at 1:40 PM
2026  128.9°F
04 July at 3:04 PM
Station Record September  117.5°F
at 13:40 on 02 September 2026
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
Overcast Overcast
Wind from SSE SSE
1
Gust:
 4 mph
0 Bft - Calm
Today: 6 mph 12:58am
Gust Month: 20 mph September 3
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 September 2026
High Gust:  20 mph
03 September at 11:27 PM
High Average:  9 mph
03 September at 11:33 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 September
High Gust:  21 mph
at 13:39 on 06 September 2016
High Average:  18 mph
at 16:29 on 13 September 2015
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:  3.0 miles
Yesterday:  13.7 miles
Highest Wind Run
September 2026  33.5 miles
14 September
2026  101.4 miles
07 February
September  103.7 miles
on 30 September 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: 0.00 in
This Month: 2.07 in
Season Total: 22.38 in
3 days since last rain.

Days Since Last Dry Day: 0
Station High September 2026
High Day:  1.01 in
03 September
High Hour:  1.06 in
04 September at 12:06 AM
High Rain Rate /hr:  5.65 in
03 September at 11:27 PM
Station High 2026
High Day:  1.35 in
16 March
High Hour:  1.06 in
04 September at 12:06 AM
High Rain Rate /hr:  6.94 in
10 August at 4:38 PM
Station Record September
High Day:  2.41 in
on 01 September 2021
High Hour:  1.59 in
at 03:01 on 01 September 2021
High Rain Rate /hr:  38.40 in
at 10:17 on 22 September 2018
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
Overnight

Overnight: Cloudy
Cloudy
Sunday

Sunday: Scattered Rain Showers
Scattered Rain Showers
Sunday
Night
Sunday Night: Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Chance Showers And T-Storms then Slight Chance Showers And T-Storms
Lo 67 °F Hi 83 °F Lo 63 °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: 88 % Increased 1.0% since last hour.
Dew Point: 67.0°F Decreased 0.1°F since last hour.
Barometer: 29.99 inHg Falling 0.02 inHg/hr
Baro Trend: Falling
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: 6:54am
Sunset: 7:11pm
Moonset: 12:29am
Moonrise: 4:07pm

Day Length:  12:14
Dawn:  06:29
Dusk:  19:37
Daylight Length:  13:07
 There will be 2min 31s less daylight tomorrow

Cloud Base

cloudbase
CB AGL: 847 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
20
Good

Sunlight

12 hrs 17 min 1 sec
of Sunlight Today
Which is
2 min 30 sec Shorter
Than Yesterday
(Noon) graph (Midnight)
 Legend

Moon


Waxing Gibbous
Waxing Gibbous, Moon at 8 days in cycle
64% %
Illuminated
 NWS Weather Forecast  - Outlook: Overnight & Sunday
Overnight

Overnight: Cloudy
Cloudy

Lo 67 °F		 NWS forecast: Cloudy, with a low around 67. South wind around 8 mph.
Davis VP+ forecast: Increasing clouds and cooler. Precipitation possible and windy within 6 hours.		   Sunday

Sunday: Scattered Rain Showers
Scattered Rain Showers

Hi 83 °F		 NWS forecast: Scattered rain showers between 9am and 2pm, then scattered showers and thunderstorms between 2pm and 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
 NWS Weather Forecast  - Five Day Outlook for Overnight through Wednesday Night - Last Update: Sun, 20-Sep-2026 2:22am EDT
Overnight

Overnight: Cloudy
Cloudy
Sunday

Sunday: Scattered Rain Showers
Scattered Rain Showers
Sunday
Night
Sunday Night: Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Chance Showers And T-Storms then Slight Chance Showers And T-Storms
Monday

Monday: Mostly Cloudy then Slight Chance Rain Showers
Mostly Cloudy then Slight Chance Rain Showers
Monday
Night
Monday Night: Showers And Thunderstorms
Showers And T-Storms
Tuesday

Tuesday: Showers And Thunderstorms
Showers And T-Storms
Tuesday
Night
Tuesday Night: Showers And Thunderstorms
Showers And T-Storms
Wednesday

Wednesday: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Wednesday
Night
Wednesday Night: Rain Showers Likely
Rain Showers Likely
Lo 67 °F Hi 83 °F Lo 63 °F Hi 74 °F Lo 59 °F Hi 65 °F Lo 54 °F Hi 63 °F Lo 54 °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
Neptune has at least 11 moons.

Today in Weather History

Weather History for September 20
 
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.