In Focus: Timeline for Storms and Strong Winds
Best chance for strong storms: late afternoon into tonight

Model simulation of radar for 8 p.m. tonight shows a line of showers and thunderstorms stretching up and down the mid-Atlantic, including through the D.C. area. Credit: NCEP
Not unlike the prevailing weather pattern this winter, a strong low pressure system will track west of D.C. today, followed by an associated cold front. Of course, each weather system has unique characteristics and this one is no different. The main threat with this system is a line of thunderstorms just ahead of the cold front that may be accompanied by strong to damaging winds. Read below for our best estimate on the timing of showers and storms ...
Noon to 4 p.m.: Ahead of the cold front, strong flow from the south will allow temperatures to climb well into the 60s. There may be some light rain showers, especially toward the end of the period.
4 p.m. to 8 p.m.: Steadier rain should move into the area from west to east, likely reaching the Beltway by the middle or latter part of this period. Some rain may be in the form of thunderstorms, especially west of D.C. and toward the end of the period, both from a line of storms that might form east of the mountains and/or isolated cells. Any thunderstorms have the potential to produce gusty winds that could be damaging in some locations.
8 p.m. to 2 a.m.: Showers and thunderstorms are likely in the metro area, with the potential for some storms to pack quite a punch. As described above, the main threat is strong to damaging wind. Isolated tornadoes are not out of the question.
2 a.m. to 7 a.m.: Any remaining showers and thunderstorms should quickly dry up as the cold front pushes east of the D.C. area. Winds will become gusty out of the west and northwest behind the cold front.
See Dan's post for more on the forecast for today through the weekend.
By Matt Ross |
March 19, 2008; 11:30 AM ET
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Posted by: Camden, Capital Weather Gang | March 19, 2008 12:00 PM
Another [url="http://forecast.weather.gov/showsigwx.php?warnzone=MEZ002&warncounty=MEC003&firewxzone=MEZ002&local_place1=Caribou+ME&product1=Winter+Storm+Warning"]big storm[/url] for northern Maine. Caribou is sure to break its seasonal snowfall record!
Posted by: WSL | March 19, 2008 12:03 PM
Wow, today must be the area wide "Emergency Alert System Test" day or something. I woke up at 12:00 this afternoon to WRQX 107.3FM testing the EAS, and just now (12:21) WJZW 105.9 tested the EAS.
It is almost pitch black in Lake Ridge. I love it!
Camden - I totally sympathize with you on the allergies. They have been kicking my butt all week. And what makes it worse is that the horrifying Bradford Pear trees just bloomed down here. It's warm today which means that their awful smell will fill the entire area. Well, I'll give them the benefit that they're pretty, but I could do without the choking smell. LOL.
Let's just hope that the wallop of rain on the radar doesn't booger out over the DC bubble and it washes everything away. :)
Posted by: weatherdudeVA (Lake Ridge) | March 19, 2008 12:25 PM
Camden,
I sympathize on the allergies. My joints in my hands are killing me and it's something Claritin can't fix.
Looking forward to the rain not only to wash the pollen but because we are still down in terms of water.
I happened to be walking out my door yesterday and ran into a guy from FFX City who was measuring water levels. I chatted with him and found out we are still some 5 feet down. Apparently, we were 25 down over the summer so it's a big improvement but we still need a good 3 days of rain.
Posted by: Sara in Oakton | March 19, 2008 12:42 PM
Matt, thanks for the detailed info. Please tell me: are we in one of those global events (maybe La Nina or El Nino, I'm sorry I'm so ignorant) that will give us more winds than usual for a long time to come, or is our current windiness a normal seasonal thing that might settle down soon? As you can see, I'm already in high-anxiety mode over the coming storm.
At least the rain (light but steady now in Eastern Panhandle) is good. I planted a redbud tree last weekend. :)
Posted by: tinkerbelle | March 19, 2008 12:44 PM
First of all, weatherdude, what's this waking up at noon business???
Camden, thanks for the detailed post. I love thunderstorms and appreciate that you're focusing on this system as much as you have focused on winter storms.
But being from Indiana, I won't be satisfied until the sky turns green. Does that ever happen here?
Posted by: Laura in NWDC | March 19, 2008 12:57 PM
Sorry, Matt. I just realized you wrote that post, not Camden.
Posted by: Laura in NWDC | March 19, 2008 12:59 PM
Also, that ad with the couple under the palm tree is starting to depress me on multiple levels. Hasn't it been there long enough? How about an ad that doesn't throw our lives into such sharp relief? Something like Claritin?
Posted by: Laura in NWDC | March 19, 2008 1:06 PM
tinkerbelle: In this part of the country, late February through early April normally produces the highest average wind speeds of the year...July and August the lowest. So, yes, the current string of windy days is more or less normal.
Laura: We DO get tornadoes ans supercells in this region, but fewer in number and generally of less intensity than in Indiana. And Indiana, of course, has generally fewer in number than in places further south and west, like Missouri, Kansas, and Arkansas.
Posted by: Mike | March 19, 2008 1:08 PM
Whats up with the models for next Tuesday in NC/SC?
Crazy weather?
Posted by: GFS | March 19, 2008 1:22 PM
The threat of severe weather tonight, while not insignificant, may be overplayed a little. We do have strong winds both at the surface ans aloft, dewpoints marginally high enough for severe weather (50-55 is generally the threshold), and a sharp cold front approaching. But the extensive cloud cover, lack of CAPE, and the timing of the frontal passage after dark should all work to limit thunderstorm development.
Posted by: Mike | March 19, 2008 1:23 PM
Another classic "Margusity-ism" in HM's latest AccuWeather.com blog post in relation to a potential snowstorm next week: "I am in no position to declare any storm will produce snow in the mid-Atlantic until I actually see the snowflakes falling." God knows HM has never let the lack of visible snowflakes stop him from declaring "BIG DADDY!" based on his model prognostications several times a week for the past three months. C'mon, Henry -- you can keep the hype machine running well into April!
Posted by: VAStateOfMind | March 19, 2008 1:35 PM
Anyone have a link to Euro models for US view. Not Europe. Thanks
Posted by: Conman | March 19, 2008 1:43 PM
How much rain will we get from this system?
Posted by: steve takoma park mdz7 | March 19, 2008 1:53 PM
Model links:
Click on "Models & Discussions" to the left in the Links box.
Posted by: Steve, Capital Weather Gang | March 19, 2008 1:55 PM
Thanks Steve
Posted by: Conman | March 19, 2008 2:10 PM
Could the Euro runs be accurate for next week?
A majority of our storms since December have run up the Appalachians or the Ohio Valley. We always get rain with the inland runners.
Next week EURO shows a healthy storm scooting the east coast. I guess time will tell
Posted by: Coman | March 19, 2008 2:17 PM
The precip shield is moving in a little early...been raining now in Vienna for almost an hour with intermittent heavy rain, no lightning. One thing is puzzling, though....a strong SW surface flow behind the warm front, but with the precip shield moving NW to SE. Ths cold front is still too far off to the west to explain the NW-SE precip movement. What's up?
Posted by: Mike | March 19, 2008 2:18 PM
Laura in NWDC,
A little tornado history that still seems fresh in my mind. Mostly because I experienced the one in College Park freshman year.
College Park, MD Tornado of Sept. 24, 2001:
http://www.weatherbook.com/collegeparkmain.html
La Plata, MD Tornado of April 28, 2002:
http://www.weatherbook.com/laplatamain.html
Posted by: Laura | March 19, 2008 2:27 PM
The 12z GFS has returned to the 00Z solution for the storm threat early next week, after trending east with the 06Z run. The ECMWF agrees with rather strong coastal development. With the NAO negative, cold air will be digging from south central Canada.
Depending on strength and track, parts of the mid Atlantic may witness quite a storm, featuring high winds(especially coastal areas, cold rain and or snow.
An interesting article appeared on the NPR website today concerning a NASA study of ocean water temperatures.
http://www.npr.org/templates/story/story.php?storyId=88520025
Posted by: Augusta Jim | March 19, 2008 2:29 PM
light rain in capitol hill...
Posted by: madison | March 19, 2008 2:39 PM
Yep, rain got here early. Been raining at a pretty good clip for the past hour. I am in the Arlington-Courthouse area.
Posted by: Emiliano | March 19, 2008 2:56 PM
Now what's the supposed time frame for this possible snow event next week? I was all set to let go of winter for good!
Laura in NWDC: I grew up in Indiana too. Palm Sunday tornadoes, 1965. Famous shot from the town I lived in was of a double tornado hitting a trailer park. I have lived here 11 years and never seen the sky turn that sick gray-green color, but about five years ago I saw a truly impressive wall cloud that measured up pretty well.
Posted by: weathergrrl | March 19, 2008 3:13 PM
Hey guys. I've got a baseball game in the afternoon tomorrow... What do you think the odds are of a cancellation? (Our field isn't the best drained, but there are tarps on the mound and home.)
Posted by: Period | March 19, 2008 3:18 PM
Rain got here pretty early I believe.
Posted by: Period | March 19, 2008 3:20 PM
I remember the F3 April Fools' Day tornado of April 1, 1973 in Falls Church. An intense low tracked from GA right over northern VA and brought three strongly contrasting air mases together. The line of thunderstorms, though without much lightning, was like nothing I've ever seen.....the shelf cloud was a dull copper BROWN. And the CB tops were never above 30,000 feet.
The only other storm I ever saw that was as frightening was the huge, absolute pitch BLACK supercell of June 24, 1996 that had a twister of multiple intensity....from F0 to borderline F2-3. At 6PM, the sky suddenly went as black as midnight...with SUSTAINED 50-knot winds with hurricane-force gusts.
I did not see the big La Plata, MD storm of April 28, 2002, but that must have been frightening as well.
Posted by: Mike | March 19, 2008 8:36 PM
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Rain is, so far, stay at bay to our west. Pollen bothering anyone else? I am really wanting this rain to wash it out. Minus the threat for isolated tornadoes. That March jet stream cannot be tamed!