Daily Forecasts

Friday, August 18, 2017

7-Day Forecast


Flash Flood Watch
Thunderstorm+Watch">Severe Thunderstorm Watch
Heat Advisory
Hazardous Weather Outlook

Tonight: Showers and possibly a thunderstorm before 9pm, then a cha nce of showers and thunderstorms between 9pm and 2am, then a slight chance of showers after 2am. Some storms could be severe, with hail, damaging winds, and heavy rain. Low around 72°. Southwest wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Area Forecast Discussion

000  
FXUS61 KLWX 181904
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
304 PM EDT Fri Aug 18 2017

.SYNOPSIS...
A cold front will cross the region tonight. Surface high
pressure will build in Saturday, but an upper level disturbance
will cross the region Saturday night. A warm front will advance
back north across the region early next week, followed by a
strong cold front in the middle of the week.

Space Weather Forecast Discussion

:Product: Forecast Discussion
:Issued: 2017 Aug 18 1230 UTC
# Prepared by the DOC, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity was very low. Region 2671 (N11E28, Fkc/beta-gamma) was
stable and only managed B-class activity. No Earth-directed CMEs were
observed in available coronagraph imagery.

.Forecast...
Solar activity is expected to remain very low with a slight chance of
M-class flares (R1-R2; Minor-Moderate radio blackouts) on days one and
two (18-19 Aug); and a decreasing chance of C-class flares all three
days (18-20 Aug). This expectation is based primarily on the decreased
activity trends of Region 2671.


7-Day Forecast


Coastal Flood Advisory
Heat Advisory
Hazardous Weather Outlook

Today: Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 92°. Heat index values as high as 105. South wind 6 to 8 mph. Chance of precipitation is 30%.

Tonight: Showers and thunderstorms likely, mainly before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 72°. Northwest wind 5 to 7 mph becoming calm. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Area Forecast Discussion

000  
FXUS61 KLWX 180739
AFDLWX

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
339 AM EDT Fri Aug 18 2017

.SYNOPSIS...
A cold front will approach from the west today before crossing
the region tonight. Surface high pressure will build in
Saturday, but an upper level disturbance will cross the region
Saturday night. A warm front will advance back north across the
region early next week, followed by a strong cold front in the
middle of the week.

Climate Report

000  
CDUS41 KLWX 172123
CLIDCA


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
523 PM EDT THU AUG 17 2017


...................................

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR AUGUST 17 2017...
VALID TODAY AS OF 0500 PM LOCAL TIME.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017


WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE
VALUE (LST) VALUE VALUE FROM
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 89 229 PM 105 1997 87 2
MINIMUM 76 544 AM 51 1902 70 6
AVERAGE 83 78 5

PRECIPITATION (IN)
TODAY 0.00 2.39 1879 0.09 -0.09
MONTH TO DATE 3.02 1.68 1.34
SINCE JUN 1 13.30 9.19 4.11
SINCE JAN 1 28.09 25.15 2.94

SNOWFALL (IN)
TODAY 0.0 MM MM 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0
SINCE JUL 1 0.0 0.0 0.0
SNOW DEPTH 0

Climatological Reports