Archive for January, 2009

MILDER AIR MOVES INTO HAMPTON ROADS… ANY PRECIPITATION THAT FALLS SUNDAY WILL BE IN THE FORM OF RAIN… COULD THERE BE SOME SNOW ACCUMULATION LATE ON MONDAY?

The large high pressure that brought the frigid temperatures to the Mid-Atlantic States is now moving offshore as a low pressure area moves to our north with a trailing cold front that will move through our region Sunday night. What does this mean for us? A lot of clouds, milder air, and maybe some light rain showers. Southwesterly winds around the departing high and ahead of the cold front are transporting the milder air into Hampton Roads. If you have frozen pipes in your home, hopefully, they will unfreeze late on Sunday, but that is not a certainty. The cold front is expected to stall and a weak low pressure area may develop to our southwest on Monday. This low will move through the area possibly producing a period of precipitation on Monday. This is where the weather forecast gets a little tricky. Temperatures may be marginally cold enough for snow in some parts of Hampton Roads late on Monday or areas to our north and west. While forecasters don’t think that this will be a major snow event for our area, stay tuned as some areas could get some accumulation of snow. I’ll have an update on this situation Monday morning.

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SATURDAY DAWNS BITTER COLD… A SHIFT IN THE WIND WILL BRING IN MILDER AIR ON SUNDAY… THERE MAY BE SOME PRECIPITATION LATE ON SUNDAY

The large high pressure area that is responsible for bringing the bone-chilling arctic air into the Eastern States is centered overhead at the time of this writing. This means 1) that winds will be on the light side 2) has caused a large drop in temperatures on Friday night due to the clear skies and light winds 3) here’s the good news… the high is moving offshore which will cause our winds to eventually swing around to the south… and you know what that means… milder weather. No heat wave by any means… but a return to temperatures that are closer to seasonal norms. Now, attention turns to a clipper system moving across the northern tier of states and the expected development of a coastal low off the SC coastline. All this should cause an increase in cloudiness on Sunday with some light rain late in the day or at night. Temperatures should be too warm for snow as the southerly wind component brings in milder air. (Sorry, snow lovers!) Precipitation amounts should be on the light side into Monday morning. There is a slight chance of a snow shower in some spots on Monday morning. I’ll have more on that in my Sunday morning post.

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GET READY FOR THE ARCTIC BLAST!… WILL WE SEE SNOW OVER THE HOLIDAY WEEKEND?… TEMPERATURES SHOULD MODERATE NEXT WEEK

The arctic air mass that has been talked about for well over a week is here. Temperatures on Friday will be very cold for this time of year and it is expected that Friday night will be the coldest night in a couple of years across SE VA. Please take precautions with pipes that could freeze and burst. A weak low is expected to move to our south and east over the weekend. This system’s track is questionable at this time and also the amount of moisture that it will have available. Although temperatures will be on the rebound on Sunday, temperatures could be cold enough to support snow, albeit light. So, stay tuned. Forecasters are calling for some light rain late on Sunday. This arctic air mass is the same one that brought the extremely frigid temperatures to Alaska and NW Canada last week. As the jet stream position shifted over the past few days, temperatures actually warmed in Alaska. Note that another system may approach the area on Tuesday. I’ll have a full update on Saturday.

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ON SUNDAY, THE RAIN MOVES OFFSHORE BUT THE CLOUDS REMAIN… WILL A LOW DEVELOPING OFFSHORE AFFECT US ON TUESDAY?… FRIGID TEMPERATURES ARE EXPECTED LATER IN THE WEEK

The showers that moved through Hampton Roads are now offshore. I checked my gauge this morning and it only had a trace of precipitation in it.  Although we shouldn’t see any significant rain on Sunday, the clouds will most likely hang tough. The clouds are caused by a combination of the approaching cold front and developing trough over the Great Lakes. Temperatures should slowly fall as our winds turn more northwesterly and then northerly. Monday should be a decent day with some sun. Then, forecasters will be watching a low pressure area as it skirts so our south and east. Current indications are that the low will pass far enough offshore so that it’s main precipitation shield will miss Hampton Roads. However, a slight deviatoin in the track of this system could bring some light precipitation into the region. By mid-week all attention will turn to the bitterly cold air that will be plunging southeastward into the nation from Canada. This is part of the same air mass that has brought the incredibly cold temperatures to Alaska and Northwestern Canada. High temperatures by the end of the week could be around freezing here in Hampton Roads. Note that temperatures may not get above zero in parts of the Great Lakes. Will there be snow here in Hampton Roads during this upcoming cold spell? We could have a couple of opportunities so stay tuned.

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A FRONTAL SYSTEM SHOULD BRING SOME SHOWERS SATURDAY NIGHT… ON SUNDAY, WE DRY OUT… MUCH COLDER WEATHER IS ON THE WAY NEXT WEEK… BUT QUESTIONS REMAIN ABOUT HOW COLD WILL IT GET?

A frontal system will move through Hampton Roads early Sunday morning. Showers will precede and accompany the front. Based on what I’ve seen, forecasters don’t think that we will see a lot of rain. Showers could linger Sunday morning, but right now, it appears that the front will make some good progress through the area and be out to sea by later in the day. Note that models have slowed the progress of this system over the last few days. Earlier in the week, forecasters were prediciting rain today during the daytime hours (Saturday). Now, the sun should rule for much of the day.  Ahead of this system, temperatures will be fairly mild for January on Saturday. They drop slightly on Sunday. The upcoming week’s forecast is quite tricky. A low pressure area is expected to form off the Southeast Coast on Tuesday but models differ as to how close it will come to our area. I’ll have an update on that on Sunday. Models are still indicating a change to the pattern later next week to a very cold one for the east but questions remain as to how cold it will be and whether we will see any wintry precipitation.

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