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Weather forecasting and analysis, space and historic events, climate information
Filtering by Category: DC
It'll remain hot and humid today in the DC metro region with the chance for mid-to-late afternoon showers and thunderstorms. It’ll stay hot on Wednesday as well, but temperatures will tend to drop off a little later in the week although the chances of showers and thunderstorms will continue on a daily basis.
Read MoreToday may turn out to be the worst day of all with respect to the recent hot spell as humidity levels are currently at tropical levels and this is raising “heat indices” to oppressive levels. "Heat indices” are a measure as to how uncomfortable overall conditions are to the average person as a result of the combination of heat and humidity. In addition to the overbearing heat and humidity, the combination of an upper-level wave of energy, a surface-level frontal system, and excessive heat and atmospheric moisture raises the prospects for strong-to-severe thunderstorm activity late this afternoon and evening along the I-95 corridor. There is a danger that some spots will get pounded by multiple storms during this event moving along in a "training" pattern; especially, across Pennsylvania, New Jersey and southern New York.
Read MoreA line of strong-to-severe thunderstorms passed through parts of the Mid-Atlantic region in the wee hours of the morning and there is the threat for another such line later today and early tonight. Today will be another very hot day with highs way up in the 90's - and an outside chance at 100 degrees in some spots - along with oppressive humidity levels and, as a frontal system approaches from the northwest, new showers and thunderstorms will break out across central and western sections of the Mid-Atlantic and then head in our direction. The most likely timetable for any shower and thunderstorm activity in our region is the rather usual time period for summertime around here; namely, the late afternoon and evening hours of about 4 to 10pm. The hot weather will continue on Tuesday and Wednesday, but humidity amounts should be reduced some following the passage of today's approaching frontal system. By later in the week, temperatures will drop off a bit with highs closer to 90 degrees, but there will also be a daily threat for showers and thunderstorms.
As far as the weekend heat is concerned, high temperatures in the I-95 corridor reached well into the 90's on both days, but no records were set. Here are the specifics for a few selected cities along I-95 in terms of high temperatures for Saturday and Sunday: PHL 97, 95; BWI 98, 94: DCA 98, 97 and NYC 96, 94. Today's record at DCA is 100 degrees (1930) and there is an outside chance that it can be reached.
Read MoreHot weather is in store for the Mid-Atlantic region from today through early next week in what is "climatologically-speaking" the peak time for temperatures in the summer season. A frontal system will approach the area later today and it will likely set off a round of showers and thunderstorms in the I-95 corridor anytime between 4 and 10pm and some of the storms can be on the strong side. The passage of the front will provide us with no relief from the heat this weekend and temperatures will soar into the 90's on both days. Another frontal system will approach late Monday bringing with it more in the way of showers and thunderstorms by late in the day or at night. The first couple of days of the new work week will continue to feature hot conditions and high temperatures well up in the 90's.
Read MoreHigh pressure will shift to our south and east today and this will open the door for hot air to return to the region on Friday from our southwest. A weakening cold front will approach later tomorrow and it could generate scattered showers and thunderstorms in the Mid-Atlantic region. Excessive heat will take place this weekend in the I-95 corridor as the dissipating frontal system will not be able to provide us with any relief in the heat. The excessive heat will continue right into the early part of next week in what is climatologically-speaking the hottest time of the summer season.
Read MoreWe are now slightly more than halfway through the summer season period of June, July and August and temperatures have averaged at above normal levels in the I-95 corridor (Philly: +0.9° June, +2.2° July; DCA: +1.0° June, +1.2° July; NYC: +0.8° June, +0.7° July) and there is no reason to believe this overall warmer-than-normal pattern will stop anytime soon despite the nice break we are experiencing here at mid-week. In fact, after this current break in the heat and humidity, excessive heat appears to be headed our way for the Friday, Saturday, Sunday, Monday time frame and this one could actually result in some isolated 100° readings in the Mid-Atlantic region. Indeed, the nation as a whole will be quite hot by the weekend which is rather typical weather for a summer featuring an El Nino-to-La Nina transition in the tropical Pacific Ocean.
Read MoreHigh pressure will sit on top of the Mid-Atlantic region today and provide us with spectacular weather considering the time of year with comfortable conditions and plenty of sunshine. This high pressure system will shift to our south and east on Thursday and this will open the door for hot air to return to the area from the Midwest at the end of the work week. A weakening cold front will approach later Friday and it could generate some shower and thunderstorm activity in the Mid-Atlantic region on Friday night. Hot weather will continue this weekend in the DC metro region with high temperatures way up in the 90’s as the dissipating frontal system will not be able to provide us with any relief.
Read MoreHigh pressure and a new air mass will push into the region today following the late night frontal passage and overall humidity levels should drop noticeably during the day. Tomorrow promises to be a nice day for mid-July with comfortable temperatures and humidity levels and then it’ll turn very warm again on Thursday afternoon, but humidity should remain relatively reasonable for one more day. Hot weather will return on Friday and continue this weekend with high temperatures likely in the 90's each day. A frontal passage on Friday night could spark a few showers and thunderstorms as the weekend begins and - given the frontal passage - 100 degrees no longer looks achievable this weekend.
Read MoreWe are now halfway through the summer season time period of June, July and August and temperatures have averaged at slightly above normal levels in the I-95 corridor (Philly: +0.9° June, +1.9° July; DCA: +1.0° June, +1.1° July; NYC: +0.8° June, +0.4° July) and there is no reason to believe this overall warmer-than-normal pattern will stop anytime soon despite a nice break coming here for the mid-week. In fact, after a break in the heat and humidity on Tuesday, Wednesday and Thursday, excessive heat appears to be headed our way for the weekend and this one could last right into early next week. Indeed, the nation as a whole will be quite hot by the weekend which is rather typical weather for a summer featuring an El Nino-to-La Nina transition in the tropical Pacific Ocean. The nice break in the heat and humidity for the mid-week time period will be brought about by the passage late tonight of a cold frontal system that will generate scattered strong-to-severe thunderstorms in the DC-to-Philly-to-NYC corridor during the 3-9 PM time period with possible damaging wind gusts.
Read MoreToday will be very hot and steamy, but Wednesday promises to be quite pleasant with comfortable temperatures and humidity – in between a strong cold frontal passage. Temperatures today will climb well into the 90’s along the I-95 corridor and, as a strong cold front approaches, the chances will grow for mid-to-late afternoon and early evening showers and thunderstorms and some of the storms can be strong. The best chance for strong thunderstorms will be in the northern and western suburbs of the metro area as there will be a tendency for some weakening of this frontal system as it slides closer to the coast. High pressure pushes back into the region on Tuesday following the frontal passage and humidity levels should drop noticeably during the day. Nice weather on Wednesday and Thursday will be followed by another hot spell for Friday, Saturday and Sunday as temperatures climb back into the 90’s.
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