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Radar image courtesy of Weather Underground. Lightning Data courtesy of Blitzortung.org and its Contributors.
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Current Clifton Virginia Conditions & NWS Forecast

Updated: @ 21-Aug-2017 7:00pm - next update at 7:15pm  
Temperature Summary Outlook
Currently: 80.2, Max: 90.5, Min: 71.1 80.2°F
Colder 1.1°F than last hour.

Warm

Feels like: 80°F

24-hr difference
-2.4°FColder 2.4°F than yesterday at this time.
  Today Yesterday
High: 90.5°F
1:28pm
85.5°F
1:10pm
Low: 71.1°F
4:56am
65.5°F
4:46am
High & Low August 2017
High:  93.2°F
18 August at 2:45 PM
Low:  57.9°F
09 August at 6:46 AM
Max Min:  75.6°F
18 August
Min Max:  74.7°F
07 August
High and Low 2017
High:  95.9°F
20 July at 1:41 PM
Low:  10.0°F
09 January at 2:00 AM
Max Min:  75.6°F
18 August
Min Max:  24.6°F
07 January
Record August
High:  98.2°F
at 3:26 PM on 13 August 2016
Low:  53.2°F
at 6:52 AM on 15 August 2014
Max Min:  77.5°F
at 6:27 AM on 13 August 2016
Min Max:  72.7°F
at 12:00 AM on 23 August 2014
Station All Time Record
High:  100.4°F
at 2:12 PM on 25 July 2016
Low:  1.0°F
at 7:23 AM on 23 January 2014
Max Min:  77.5°F
at 6:27 AM on 13 August 2016
Min Max:  16.7°F
at 12:04 PM on 16 February 2015
Records began on 24 December 2012
Wind Chill
Now:  80.2°F
Coldest Wind Chill
Today:  71.1°F
at 4:56am
Yesterday:  65.5°F
at 4:46am
August 2017  57.9°F
09 August at 6:46 AM
2017  4.1°F
08 January at 2:24 AM
Station August  -8.3°F
at 8:35 AM on 29 August 2015
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: 0.0 Degree Days
Yesterday: 0.0 Degree Days
Cooling Degree Days
Today: 11.1 Degree Days
Yesterday: 11.2 Degree Days
Heat Index
Now:  84.6°F
Warmest Heat Index
Today:  101.5°F
at 13:28
Yesterday:  86.8°F
at 16:52
August 2017  106.7°F
18 August at 1:11 PM
2017  106.7°F
18 August at 1:11 PM
Station Record August  113.8°F
at 1:07 PM on 13 August 2016
Station All Time  114.2°F
at 12:45 PM on 19 July 2013
Records began on 24 December 2012
Mostly cloudy Mostly cloudy
 Wind from E E
3.9
Gust:
5.0 mph
1 Bft - Light air
Today: 10.0 mph 3:11pm
Gust Month: 32.2 mph August 19
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 August 2017
High Gust:  32.2 mph
19 August at 9:02 PM
High Average:  10.9 mph
05 August at 10:58 AM
Station High 2017
High Gust:  32.2 mph
19 August at 9:02 PM
High Average:  22.7 mph
22 March at 10:08 AM
Station Record August
High Gust:  32.2 mph
at 9:02 PM on 19 August 2017
High Average:  11.8 mph
at 2:57 PM on 21 August 2016
Station All Time Record
High Gust:  39.3 mph
at 10:04 PM on 14 February 2015
High Average:  22.7 mph
at 10:08 AM on 22 March 2017
Records began on 24 December 2012
Wind Run
Today:  34.6 miles
Yesterday:  24.5 miles
Highest Wind Run
August 2017  91.3 miles
05 August
2017  179.1 miles
14 March
August  91.3 miles
on 05 August 2017
Station All Time  246.9 miles
on 15 February 2015
Records began on 24 December 2012
Rain
Rain Today: 0.00 in
Rain Rate (/hr): 0.00 in
Rain Yesterday: 0.01 in
This Month: 5.33 in
Season Total: 29.04 in
1 day since last rain.
Days Since Last Dry Day: 3
Station High August 2017
High Day:  1.89 in
11 August
High Hour:  6.61 in
04 August at 2:09 PM
High Rain Rate /hr:  2.88 in
11 August at 7:36 PM
Station High 2017
High Day:  2.00 in
06 July
High Hour:  6.61 in
04 August at 2:09 PM
High Rain Rate /hr:  3.59 in
28 July at 2:12 PM
Station Record August
High Day:  2.17 in
on 12 August 2014
High Hour:  6.61 in
at 2:09 PM on 04 August 2017
High Rain Rate /hr:  2.88 in
at 2:54 PM on 21 August 2016
Station All Time Record
High Day:  3.02 in
on 30 April 2014
High Hour:  6.61 in
at 2:09 PM on 04 August 2017
High Rain Rate /hr:  5.03 in
at 5:35 PM on 03 June 2016
High Month:  7.18 in
April 2014
Records began on 24 December 2012
Tonight

Tonight: Scattered Showers And Thunderstorms then Mostly Cloudy
Scattered Showers And T-Storms then Mostly Cloudy
Tuesday

Tuesday: Mostly Sunny
Mostly Sunny
Tuesday
Night
Tuesday Night: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Lightning VA MD DC WV DE
Viginia Lighting
Radar Washington DC Metro Area
Local Radar
Storm Prediction Center Activity Chart
SPC Activity
Humidity & Barometer
Humidity: 79 % Increased 9.0% since last hour.
Dew Point: 73.2°F Increased 1.3°F since last hour.
Barometer: 30.15 inHg  
Baro Trend: Steady
Today
Pressure High:  30.24 in
Pressure Low:  30.14 in
Dewpoint High:  76.4 °F
Dewpoint Low:  67.7 °F
Humidity High:  92%
Humidity Low:  60%
Station Record
Pressure High:  31.41 in
at 12:14 PM on 23 March 2017
Pressure Low:  29.12 in
at 5:28 PM on 12 March 2014
Dewpoint High:  79.7 °F
at 11:26 AM on 19 July 2013
Dewpoint Low:  -58.6 °F
at 6:50 PM on 19 February 2017
Records began on 24 December 2012
Snow
Snow Depth: 0 in
Snowfall Today: No snow today
Storm Total: 0 in
Total Season Snow: 0 in
Total Last Season: 5.2 in
Fire Danger
firedanger
Almanac
Sunrise: 6:29am
Sunset: 7:56pm
Moonrise: 6:10am
Moonset: 7:55pm
Day Length:  13:27
Dawn:  06:01
Dusk:  20:25
Daylight Length:  14:24
 There will be 2min 18s less daylight tomorrow
Cloud Base
cloudbase
CB: 1602 ft
UV Index Forecast Today
21-Aug-2017

8.4  Very High 
UV Index Forecast Tomorrow
22-Aug-2017

8.9  Very High 
Air Quality Index
Current AQI 71
Moderate
Sunlight
13 hrs 25 min 25 sec
of Sunlight Today
Which is
2 min 19 sec Shorter
Than Yesterday

(Noon)
graph (Midnight)
Legend
Moon
New Moon
New Moon, Moon at 0 days in cycle
0 %
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 Temperature Graph Thumbnail Pressure Graph Thumbnail Rain Graph Thumbnail
Wind Direction Thumbnail Temp Min/Max Graph Thumbnail Humidity Graph Thumbnail Today's Rainfall Graph Thumbnail Daily Rain Graph Thumbnail
 NWS Weather Forecast  - Outlook: Tonight & Tuesday
Tonight

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

Lo 73 °F
NWS forecast: Scattered showers and thunderstorms before 11pm. Mostly cloudy, with a low around 73. South wind 3 to 8 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
  Tuesday

Tuesday: Mostly Sunny
Mostly Sunny

Hi 95 °F
NWS forecast: Mostly sunny, with a high near 95. South southwest wind 3 to 12 mph.
 NWS Weather Forecast  - Five Day Outlook for Tonight through Friday Night - Last Update: Mon, 21-Aug-2017 4:55pm EDT
Tonight

Tonight: Scattered Showers And Thunderstorms then Mostly Cloudy
Scattered Showers And T-Storms then Mostly Cloudy
Tuesday

Tuesday: Mostly Sunny
Mostly Sunny
Tuesday
Night
Tuesday Night: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Wednesday

Wednesday: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Wednesday
Night
Wednesday Night: Chance Rain Showers then Partly Cloudy
Chance Rain Showers then Partly Cloudy
Thursday

Thursday: Mostly Sunny
Mostly Sunny
Thursday
Night
Thursday Night: Partly Cloudy
Partly Cloudy
Friday

Friday: Sunny
Sunny
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Lo 73 °F Hi 95 °F Lo 73 °F Hi 83 °F Lo 63 °F Hi 79 °F Lo 61 °F Hi 79 °F Lo 59 °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.
Countdown to Fall
 Autumn Equinox begins September 22nd at 4:02pm   EDT  
 

 

Random Weather Facts

Astronomy
Neptune has at least 11 moons.

Today in Weather History

Weather History for August 21
 
1988
Thunderstorms spawned several tornadoes in Iowa, produced wind gusts to 63 mph in the Council Bluffs area, and drenched Sioux Center IA with up to 6.61 inches of rain. (Storm Data) (The National Weather Summary)

1989
Afternoon and evening thunderstorms produced severe weather from Kansas to Minnesota and North Dakota. Thunderstorms in Minnesota produced baseball size hail from Correll to north of Appleton. Thunderstorms in north central Kansas produced wind gusts higher than 100 mph at Wilson Dam. Thunderstorms around Lincoln NE produced baseball size hail and up to five inches of rain, and Boone NE was deluged with five inches of rain in an hour and a half. (The National Weather Summary) (Storm Data)