TTCM () > WeatherSaturday, May 21, 2022 — W1 11% W3 W4 W5 79°F
Washington DC Climate ReportDeckSunrise: 5:51; Solar Noon: 1:05; Sunset: 8:19

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Last 72 Hours: ObservationsCurrently: 79°F  — USNO Clear Sky ChartHeavens-Above

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DCwx
...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR MAY 20 2022...

WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
TEMPERATURE (F)
 TODAY
  MAXIMUM         89   3:48 PM  96    1996  77     12       93
  MINIMUM         67   3:23 AM  42    2002  59      8       62
  AVERAGE         78                        68     10       78

PRECIPITATION (IN)
  TODAY            0.00          2.63 2005   0.13  -0.13     0.00
  MONTH TO DATE    4.19                      2.53   1.66     0.69
  SINCE MAR 1     10.78                      9.24   1.54     6.69
  SINCE JAN 1     16.79                     14.72   2.07    13.28

Observations Archive

Special Weather Statement
Hazardous Weather Outlook

Today: Mostly sunny, with a high near 96°. Southwest wind 3 to 8 mph.

Tonight: Partly cloudy, with a low around 74°. Southwest wind around 7 mph.

Sunday: Showers and thunderstorms likely after 2pm. Increasing clouds, with a high near 92°. Southwest wind around 8 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 61°. Light and variable wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday: A chance of showers, mainly after 2pm. Partly sunny, with a high near 74°. North wind around 8 mph. Chance of precipitation is 30%.

Monday Night: A chance of showers. Mostly cloudy, with a low around 59°. Chance of precipitation is 30%.

Tuesday: A chance of showers before 2pm. Partly sunny, with a high near 73°. Chance of precipitation is 30%.

Tuesday Night: Mostly cloudy, with a low around 57°.

Wednesday: A chance of showers. Mostly cloudy, with a high near 75°. Chance of precipitation is 30%.

Wednesday Night: Mostly cloudy, with a low around 64°.

Thursday: A chance of showers. Partly sunny, with a high near 85°. Chance of precipitation is 50%.

Thursday Night: A chance of showers. Mostly cloudy, with a low around 68°. Chance of precipitation is 50%.

Friday: Showers likely. Partly sunny, with a high near 83°. Chance of precipitation is 60%.

Baltimore/Washington Forecast Office

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Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
931 PM EDT Fri May 20 2022

.SYNOPSIS...
High pressure will build in and remain off the southeast coast
through the weekend. A strong cold front will cross the region
later in the day on Sunday. This frontal boundary will likely
stall to our south through the early part of next week.


.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
Heights will continue to rise aloft overnight as high pressure
at the surface remains situated off to our southeast over the
Atlantic. Light south to southwesterly flow will continue on
the backside of the high, which will maintain an unseasonably
warm and humid airmass over the region. Lows will only drop into
the low-mid 70s to the east of the Blue Ridge, with mid- upper
60s to the west of the Blue Ridge. Dewpoints will hold in the
60s to near 70. High clouds across the northern half of the
forecast area will continue to lift off toward the north and
east over the next several hours, leading to mostly clear skies
during the second half of the overnight.


.SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/...
The weekend looks to be the hottest it has been since September of
last year. Temperatures will likely be nearing records, especially
Saturday afternoon. These early season heat blasts can sometimes be
even more problematic than the middle of the summer with a quick
change from seasonable temperatures to hot weather, especially with
more sensitive populations. Highs will likely shoot up into the mid
to even upper 90s Saturday afternoon. With a good bit of midlevel
dry air in place, dew points will likely mix into the low 60s. With
this in mind, heat indices look to remain just below hazard criteria
for any headlines to be issued for now. Will monitor the latest
guidance to potentially make any further adjustments to the highs
for Saturday. With a building high pressure off to the southeast,
most areas should remain dry with subsidence nearby. Latest CAMs
display a few showers and even rumble of thunder across the mountain
areas later Saturday afternoon. Instability parameters are certainly
present for the afternoon hours so if any storms do fire off out
west during this time then there may be a conditional severe threat
should this solution come to fruition.

By Sunday, a cold front will be approaching the area from the NW.
Showers and thunderstorms will likely be present throughout the
afternoon and evening hours. A lee trough will develop ahead of this
front late morning into the early afternoon. Instability will likely
remain elevated through the day but shear looks to be rather weak.
Do think there is an isolated chance for a few strong to severe
thunderstorms to form along and just ahead of the cold front. A
Marginal Risk is in place from SPC for areas east of the Allegheny
Front. There is a non-zero risk for flooding as the cold front
starts to slow down as it continues further south later Sunday.
Highs will be a few degrees cooler than Saturday on Sunday but
will continue to be hot and will be more humid with a warm,
moist airmass ahead of the cold front. This front will slowly
move southward through Sunday night and continue to linger into
Monday.


.LONG TERM /MONDAY THROUGH FRIDAY/...
Overall good agreement amongst the the latest guidance suite.
General jet stream pattern will be orientated in a SW to NE
orientation for the beginning of next week. Weak shortwave energy
residing near the Gulf states will gradually lift northward through
the middle of next week. However, the overall pattern will shift to
where strong upper level ridging will become the dominate feature
by the middle of next week. As a result, the shortwave will slowly
traverse along the ridge axis as a weak, disorganized low tracks
northward along the Appalachians. Thus while Monday looks to remain
mostly dry, cloud cover is likely to increase as chances for showers
increase through Tuesday morning. As the ridge crests off the
Eastern seaboard, the shortwave will exit off to the east as well.
However chances for showers will remain elevated with a lingering
stationary front nearby.

Meanwhile, a stronger shortwave maxima will track eastward towards
the second half of next week. This will drag a stronger cold front
eastward across the region, where more widespread showers and storms
can occur. General temperature trend for next week looks to remain
near seasonable levels, with slightly above normal chances for
precip.


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