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Fairfax, VA Weather and Climate Synopsis

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Regional Hourly Observations For FAIRFAX County
1000 AM EST FRI DEC 15 2017


NORTHERN VIRGINIA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
WASH NATIONAL  CLOUDY    31  12  45 E3        30.10S                  
DULLES         CLOUDY    29  14  53 E7        30.07F                  
FORT BELVOIR   CLOUDY    30  11  45 CALM      30.09S                  
QUANTICO       CLOUDY    32  16  51 E3        30.10F                  
FREDERICKSBRG* CLOUDY    32  19  59 NE3       30.07S                  
STAFFORD*      CLOUDY    31  18  57 NE5       30.11S                  
WARRENTON      CLOUDY    31  14  48 CALM      30.06S                  
CULPEPER*      CLOUDY    31  15  50 CALM      30.07F                  
MANASSAS*      CLOUDY    30  16  56 SE5       30.08S                  
LEESBURG*      CLOUDY    30  19  64 CALM      30.08S                  
WINCHESTER     CLOUDY    28  14  54 CALM      30.03S                  
FRONT ROYAL*   CLOUDY    28  18  64 MISG      30.02S                  
LURAY*         CLOUDY    30  19  64 CALM      30.01S                  

Current Temperatures, Dewpoint, RH, Wind, Regional Obs, Surface 4-Panel


Current Agricultural Weather Conditions in Virginia
Based on observations at 1000am EST, Friday December 15, 2017

Across Virginia...temperatures are near 29 degrees north, near 37 degrees central, and near 33 degrees south. Current sky conditions are cloudy north, cloudy central, and cloudy south. In the north, relative humidity is near 53%, and the dew point is near 14 degrees. In the central part of the state, relative humidity is near 48%, and the dew point is near 19 degrees. In the south, relative humidity is near 61%, and the dew point is near 21 degrees. Winds are from the east at 7 mph north, where conditions are favorable for spraying. Winds are from the north at 9 mph central, where conditions are favorable for spraying. Winds are from the east at 6 mph south, where conditions are favorable for spraying. The livestock cold stress index is in the no stress category north, no stress category central, and no stress category south. Based on current available observations, the highest temperature is 46 degrees at Norfolk. The lowest temperature is FAIR degrees at Roanoke.


Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.

US Radar, All NWS Radars (In near-real time), Current Livestock Heat Stress Index (LSI), Current Wind Chill Map
Hazardous Weather Outlook For FAIRFAX County,VA

956 AM EST Fri Dec 15 2017

 DAY ONE  Today and Tonight

A Winter Weather Advisory is in effect for the Baltimore-
Washington metro corridor from 1pm to 7pm for an inch or two of 
snow. This will impact the evening commute. For the rest of the
outlook area  light snow accumulations are likely to be under an
inch but this can still cause slippery conditions through the
evening commute. 

 DAYS TWO THROUGH SEVEN  Saturday through Thursday

No hazardous weather is expected at this time.

 SPOTTER INFORMATION STATEMENT  

Spotter activation is not expected at this time.

NWS Severe Weather Map , Convective Outlook


7-Day Forecast For FAIRFAX County, VA
Issued at 930 AM EST Fri Dec 15 2017

REST OF TODAY
Snow likely. Snow accumulation around an inch. Highs in the mid 30s. Southeast winds around 5 mph, becoming southwest this afternoon. Chance of snow 70 percent.

TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 20s. West winds 5 to 10 mph.

SATURDAY
Mostly sunny. Highs in the mid 40s. West winds 5 to 10 mph.

SATURDAY NIGHT
Mostly clear. Lows in the upper 20s. Southwest winds around 5 mph.

SUNDAY
Mostly sunny in the morning, then becoming mostly cloudy. Highs in the upper 40s. South winds around 5 mph.

SUNDAY NIGHT
Mostly cloudy with a 30 percent chance of rain. Lows in the mid 30s.

MONDAY
Partly sunny. Highs in the mid 50s.

MONDAY NIGHT
Mostly cloudy. Lows around 40.

TUESDAY
Partly sunny. Highs in the upper 50s.

TUESDAY NIGHT
Partly cloudy. Lows in the upper 30s.

WEDNESDAY
Sunny. Highs in the upper 40s.

WEDNESDAY NIGHT
Mostly clear. Lows in the lower 30s.

THURSDAY
Mostly sunny. Highs around 50.

12-48 Hr Surface Forecast Maps, TWC 4-Panel Surface Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip, Severe Weather Pot.-Day 1, Day 2


Medium & Long Range Outlook For Virginia
                             VIRGINIA                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   DEC 20-24    DEC 22-28    DEC       DEC-FEB                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Above     Normal      Above                      
 Precipitation:      Above        Above      Below      Below                      

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
Almanac Information

Friday December 15, 2017 the 349th Day of Year

---------------------------------------------------
SUN
Declination -23.310000
Distance 0.999725 AU
Rise 07:25 EST Set 16:58 EST
Transit Meridian 12:11 EST
Civil Twilight Begins 06:57 EST Ends 17:26 EST

Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy


Historical Weather And Climate Facts For Today

DECEMBER 15TH
HISTORIC WEATHER EVENTS
...1839...
The first of triple storms hit Massachusetts Bay. The storm produced whole
gales, and more than 20 inches of snow in interior New England. There was
great loss of life at Gloucester MA. (David Ludlum)
...1901...
An intense cold front swept across the eastern U.S. The cold front produced
heavy rain in Louisiana, and heavy snow in the northeastern U.S. (David
Ludlum)
...1945...
A record December snowstorm buried Buffalo NY under 36.6 inches of snow,
with unofficial totals south of the city ranging up to 70 inches. Travel
was brought to a halt by the storm. (14th-17th) (The Weather Channel)
...1987...
A major winter storm hit the Great Lakes Region, intensifying explosively
as it crossed northern Illinois. High winds and heavy snow created blizzard
conditions in southeastern Wisconsin. Winds gusted to 73 mph, and snowfall
totals ranged up to 17 inches at LaFarge. The barometric pressure at
Chicago IL dropped three quarters of an inch in six hours to 28.96 inches,
a record low reading for December. Up to a foot of snow blanketed northern
Illinois, and winds in the Chicago area gusted to 75 mph. O'Hare Airport in
Chicago was closed for several hours, for only the fourth time in twenty
years. High winds derailed train cars at Avon IN. Light winds and partly
sunny skies were reported near the center of the storm, a feature typical
of tropical storms. (The National Weather Summary) (Storm Data)
...1988...
High pressure in the Pacific Northwest and low pressure in the southwestern
U.S. combined to produced high winds from Utah to California. Winds gusting
to 70 mph in the San Francisco area left nearly 300,000 residents without
electricity. Winds in Utah gusted to 105 mph at Centerville. (The National
Weather Summary) (Storm Data)
...1989...
A couple of low pressure systems spread heavy snow across the northeastern
U.S. Up to two feet of snow was reported along Lake Erie in northeastern
Ohio, and up to ten inches was reported in Connecticut. Heavy snow squalls
developed over Michigan for the third day in a row. Three Oaks MI reported
25 inches of snow in two days. Twenty-six cities in the north central U.S.
reported record low temperatures for the date. The low of 10 degrees below
zero at Wichita KS was a December record for that location. (The National
Weather Summary) (Storm Data)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky