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Arlington, VA Weather and Climate Synopsis

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Regional Hourly Observations For ARLINGTON County
500 PM EST SAT DEC 16 2017


NORTHERN VIRGINIA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
WASH NATIONAL  PTCLDY    45  23  42 S12       30.10R                  
DULLES         PTCLDY    41  23  48 S7        30.08R                  
FORT BELVOIR   CLEAR     44  23  43 S6        30.10R                  
QUANTICO       CLEAR     45  28  51 SW7       30.13R                  
FREDERICKSBRG* CLEAR     45  25  45 S8        30.12R                  
STAFFORD*      CLEAR     45  23  42 S3        30.15R                  
WARRENTON      CLEAR     44  18  36 S3        30.09R                  
CULPEPER*      CLEAR     45  21  38 S5        30.10R                  
MANASSAS*      CLEAR     43  23  45 S5        30.10R                  
LEESBURG*      CLEAR     43  27  52 SW5       30.09R                  
WINCHESTER     CLEAR     43  23  45 S3        30.05R                  
FRONT ROYAL*   CLEAR     45  25  45 MISG      30.05R                  
LURAY*         CLEAR     45  27  49 S3        30.06R                  

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


Current Agricultural Weather Conditions in Virginia
Based on observations at 400pm EST, Saturday December 16, 2017

Across Virginia...temperatures are near 45 degrees north, near 52 degrees central, and near 49 degrees south. Current sky conditions are partly cloudy north, clear central, and clear south. In the north, relative humidity is near 42%, and the dew point is near 23 degrees. In the central part of the state, relative humidity is near 30%, and the dew point is near 22 degrees. In the south, relative humidity is near 37%, and the dew point is near 24 degrees. Winds are from the southwest at 9 mph north, where conditions are favorable for spraying. Winds are from the southwest at 9 mph central, where conditions are favorable for spraying. Winds are variable 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 52 degrees at Richmond. 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 ARLINGTON County,VA

505 AM EST Sat Dec 16 2017

 DAY ONE  Today and Tonight

No hazardous weather is expected at this time.

 DAYS TWO THROUGH SEVEN  Sunday through Friday

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 ARLINGTON County, VA
Issued at 405 PM EST Sat Dec 16 2017

REST OF THIS AFTERNOON
Mostly sunny. Highs in the mid 40s. Southwest winds 5 to 10 mph.

TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 30s. West winds 5 to 10 mph.

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

SUNDAY NIGHT
Mostly cloudy. Lows in the mid 30s. South winds around 5 mph, becoming southwest after midnight.

MONDAY
Partly sunny. Highs in the lower 50s. Southwest winds around 5 mph.

MONDAY NIGHT
Mostly cloudy. Lows in the lower 40s.

TUESDAY
Mostly sunny. Highs in the upper 50s.

TUESDAY NIGHT
Partly cloudy. Lows around 40.

WEDNESDAY
Partly sunny. Highs in the upper 40s.

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

THURSDAY
Mostly sunny. Highs in the mid 40s.

THURSDAY NIGHT
Partly cloudy with a chance of rain or freezing rain. Lows in the mid 30s. Chance of precipitation 30 percent.

FRIDAY
Partly sunny. Highs in the lower 50s.

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 22-26    DEC 24-30    DEC       DEC-FEB                      
                 -----------  -----------  --------  ---------
   Temperature:      Above       Normal     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

Saturday December 16, 2017 the 350th Day of Year

---------------------------------------------------
SUN
Declination -23.350000
Distance 0.999725 AU
Rise 07:26 EST Set 16:58 EST
Transit Meridian 12:12 EST
Civil Twilight Begins 06:57 EST Ends 17:27 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 16TH
HISTORIC WEATHER EVENTS
...1835...
New England experienced one of their coldest days of record. At noon on
that bitterly cold Wednesday the mercury stood at four degrees below at
Boston, 15 degrees below at Norfolk CT, and 17 degrees below at Hanover NH.
The temperature at Boston was 12 degrees below zero by sunset. Gale force
winds accompanied the severe cold, and that night a great New York City
fire destroyed much of the financial district. (David Ludlum)
...1869...
A bill was introduced in the House of Representatives, 41st Congress, 
calling for the taking [of] meteorological observations at the military 
stations in the interior of the continent, and for giving notice on the 
northern lakes and Atlantic seaboard of the approach and force of storms. 
This would be signed in to law February 9, 1870, by President Grant, 
establishing what would come to be called the National Weather Service. You 
can see the actual bill on-line at: 
 here.
...1917...
An ice jam closed the Ohio River between Warsaw KY and Rising Sun IN. The
thirty foot high ice jam held for 58 days, and backed up the river a
distance of 100 miles. (David Ludlum)
...1987...
A Pacific storm battered the coast of California with rain and high winds,
and dumped heavy snow on the mountains of California. Winds along the coast
gusted to 70 mph at Point Arguello, and winds in the Tehachapi Mountains of
southern California gusted to 100 mph at Wheeler Ridge. Snowfall totals
ranged up to 24 inches at Mammoth Mountain. Snow fell for two minutes at
Malibu Beach, and Disneyland was closed due to the weather for only the
second time in twenty-four years. A winter storm which began in the
Southern Rockies four days earlier finished its course producing snow and
high winds in New England. Snowfall totals ranged up to 19 inches at
Blanchard ME. (The National Weather Summary) (Storm Data)
...1988...
Fairbanks AK reported freezing rain and record warm temperatures. The
afternoon high of 41 degrees was 43 degrees above normal. Snow and high
winds continued to plague the mountains of southern California. Mount
Wilson CA reported two inches of rain in six hours during the early
morning, and a storm total of more than 3.50 inches of rain. (The National
Weather Summary)
...1989...
Fifty-seven cities from the Southern and Central Plains to the Appalachians
reported record low temperatures for the date, including North Platte NE
with a reading of 17 degrees below zero. Squalls in the Great Lakes Region
produced 18 inches of snow at Syracuse NY, and 30 inches at Carlisle IND.
Low pressure brought heavy snow to northern New England, with 18 inches
reported at Derby VT and Saint Johnsbury VT. (The National Weather Summary)
(Storm Data)

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