TTCM () > WeatherThursday, September 29, 2022 — W1 W2 W3 W4 W5 58°F
Washington DC Climate ReportDeckSunrise: 7:02 (W1: 51%); Solar Noon: 12:59 (W3: 49%); Sunset: 6:56 (W5: 47%)

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Last 72 Hours: ObservationsCurrently: 58°F  — USNO Clear Sky ChartHeavens-Above

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DCwx
...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR SEPTEMBER 28 2022...

WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
TEMPERATURE (F)
 TODAY
  MAXIMUM         73   1:22 PM  91    1886  76     -3       82
  MINIMUM         51   5:06 AM  42    1897  60     -9       63
                                      1918
                                      1947
  AVERAGE         62                        68     -6       73

PRECIPITATION (IN)
  TODAY            T             2.46 2004   0.13  -0.13      T
  MONTH TO DATE    1.95                      3.66  -1.71     4.03
  SINCE SEP 1      1.95                      3.66  -1.71     4.03
  SINCE JAN 1     33.90                     31.57   2.33    39.21

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Forecast updates at 6 AM ET — Thursday, 29-Sep-2022 00:16:07 CDT

Today: Sunny, with a high near 70°. Light west wind becoming northwest 5 to 9 mph in the morning.

Tonight: Partly cloudy, with a low around 52°. North wind 6 to 8 mph.

Thursday: Mostly sunny, with a high near 70°. North wind 7 to 10 mph, with gusts as high as 18 mph.

Thursday Night: Mostly cloudy, with a low around 52°. North wind 6 to 8 mph.

Friday: Partly sunny, with a high near 69°. North wind 7 to 11 mph, with gusts as high as 18 mph.

Friday Night: Rain likely, mainly after 3am. Cloudy, with a low around 56°. Chance of precipitation is 60%.

Saturday: Rain likely. Cloudy, with a high near 65°. Chance of precipitation is 60%.

Saturday Night: Rain likely. Cloudy, with a low around 57°. Chance of precipitation is 60%.

Sunday: Rain likely. Cloudy, with a high near 65°. Chance of precipitation is 60%.

Sunday Night: Rain likely. Cloudy, with a low around 56°. Chance of precipitation is 60%.

Monday: Rain likely. Cloudy, with a high near 64°. Chance of precipitation is 60%.

Monday Night: A chance of rain. Mostly cloudy, with a low around 55°. Chance of precipitation is 50%.

Tuesday: A chance of showers. Partly sunny, with a high near 66°. Chance of precipitation is 40%.

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Discussion updates at 4 AM ET


Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
349 AM EDT Wed Sep 28 2022

.SYNOPSIS...
An upper-level trough will remain overhead through tonight before
moving off to the northeast Thursday. High pressure will build
north of the area for later Thursday into Friday. Low pressure
may impact the area this weekend into early next week. For the
latest information on Ian, refer to the National Hurricane
Center (hurricanes.gov).


.NEAR TERM /THROUGH TONIGHT/...
An upper-level trough will continue to build overhead while
surface high pressure approaches from the north and west. A
northwest flow will continue, and with the trough overhead it
will be cool for this time of year. Max temps will range from
the 40s and 50s in the Allegheny Highlands to the 60s and lower
70s for most other locations.

Most areas will be dry, but there will be some instability
underneath a subsidence inversion, thanks to the upper-level
trough. Scattered showers are expected in the Allegheny
Highlands, especially late this morning into early this evening.
A few isolated showers may spill east of the mountains into
northern MD/eastern WV/northern VA this afternoon/early evening.
An precipitation amounts will be light.

A sct/bkn cu deck will overspread the area from northwest to
southeast this morning into this afternoon in response to the
digging upper-level trough.

The trough will remain overhead tonight while high pressure
continues to build toward the area. Dry and cool conditions are
expected. A thin stratocu deck and light north to northwest wind
should prevent any widespread frost from developing in the
Allegheny Highlands.


.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
The upper-level trough will move away from the area Thursday
while high pressure builds to the north. Dry conditions are
expected along with some sunshine. Highs will be in the 60s to
lower 70s for most areas (50s in the mountains). Dry and cool
conditions will persist for Thursday night with high pressure
nearby.

Ian will most likely track northward near the southeast coast
Friday before moving further inland Friday night. Refer to the
National Hurricane Center for the latest information regarding
the track of Ian. Tropical moisture and warm air will overrun
cooler air in place, resulting in increasing clouds Friday along
with increasing chances for rain from southeast to northwest
late Friday through Friday night.


.LONG TERM /SATURDAY THROUGH TUESDAY/...
An increasingly likely wet start to the long term period as a
result of future remnants from Hurricane Ian. Synoptically, a
large area of high pressure over the Northeast will play a
pivotal role in the progression of the incoming low pressure
system to the south.

Should the latest forecast solution become realized, isolated
instances of flooding as a result from moderate to heavy
rainfall are possible, mainly south of the metropolitan areas
where confidence is higher for heavier rainfall. Precedent dry
soil conditions may be beneficial in this instance to relieving
the flood threat to a more isolated nature. The rainfall will
most likely hang around through Monday before slowly exiting
toward the middle portion of next week.

With any complex system (i.e, a hurricane), uncertainties will
remain heading closer to the actual event given the variability of
the storms progression before reaching a point as well as other
meso/micro/synoptic-scale forcing that may play a role. As always
with any tropical events, please visit hurricanes.noaa.gov for the
latest tropical forecast via the National Hurricane Center.

Temperatures for the long term will hover around at or just below
average for most of the area in terms of highs (60s for most, 50s
for higher elevations with localized 40s late in the weekend).


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