Spring greets the new workweek, bringing milder weather but also some chills midweek.
WASHINGTON — Spring arrives (arrived, depending on when you’re reading this) at 6:29 a.m. EDT Monday, according to the U.S. Naval Observatory. (Some sources say 6:28 a.m.)
That is the vernal equinox: The moment the sun is directly above the equator and starts heading back toward the Tropic of Cancer, which will be the summer solstice.
So, even though we’ve had plenty of previews so far this year, Monday is spring. And after a cool weekend, temperatures will be on the rebound. It’s only temporary, though. Chilly weather will return for midweek, only to rebound once again. In the process will be a cold frontal passage, bringing a chance for only some light rain Monday night.
The storm last week produced a lot of needed moisture from the rain and snowmelt, but we still need more. This week, we won’t get it.
Spring arrives (arrived, depending on when you’re reading this) at 6:29 a.m. EDT Monday, according to the U.S. Naval Observatory. (Some sources say 6:28 a.m.)
(WTOP/Storm Team 4)
WTOP/Storm Team 4
This is the vernal equinox: The moment the sun is directly above the equator and starts heading back toward the Tropic of Cancer, which will be the summer solstice.
(Image: TimeandDate.com)
Image: TimeandDate.com
The following six images are output from the RPM computer model, which you may recall did a very good job depicting the evolution of last week’s storm, including the snow/sleet/rain areas. This run shows the clouds increasing on Monday with the quick-moving system cutting just to our south, giving us light rain and drizzle Monday night, followed by clearing through Tuesday and Wednesday morning. Wednesday is when the sharp clearing comes down from Canada in advance of an Arctic high pressure system.
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
(Data: The Weather Company | Graphics: Storm Team 4)
Data: The Weather Company | Graphics: Storm Team 4
The American GFS computer model shows the temperature swings on the way for the workweek. We’re kind of “bookended” with warmth. Chilly weather will be in the middle. Note that Storm Team 4 believes the numbers on the warm days are likely a little too cool in the computer model compared to what will actually happen.
(Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4)
Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4
(Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4)
Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4
(Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4)
Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4
(Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4)
Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4
(Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4)
Data: Environmental Modeling Center, NOAA | Graphics: Storm Team 4
Lastly, as mentioned, we will not have any large, powerful storms this week, so rainfall amounts will be sparse, likely only a few tenths at the most. The computer model is again the GFS. Almost all the rainfall amounts depicted will occur Monday night and early Tuesday morning.
(Graphics: Storm Team 4)
MONDAY
• Cold, mainly clear start
• Sun fading behind increasing cloud cover
• Seasonable high temperatures in the upper 50s to near 60
• Rain arriving after nightfall
TUESDAY
• Some lingering drizzle, damp roadways in the morning
• Mild in the morning, likely in the 40s
• Partial clearing, some temperatures end up warm in the afternoon
• Chillier air moves in with northerly winds in the evening and at night
WEDNESDAY
• Breezy and chilly
• Temperatures below average, may actually fall through the day
• Clouds in the morning, becoming mostly sunny during the afternoon
THURSDAY
• Freezing temperatures in the morning
• Near total sunshine, but unseasonably chilly
• Very dry air
FRIDAY
• Very chilly start, some more freezing especially in the rural areas
• Mostly sunny; quick warm up
• Temperatures feeling like spring again during the afternoon