WEATHER BLOG: Gray & Damp

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timwilliams

We have a frontal zone that’s pushing southward early Saturday morning. This frontal zone is an important one as it sets the tracks for a weak area of low pressure that will track eastward from southern Indiana to central Virginia late Saturday afternoon. This area of low pressure will send a swath of precipitation across out area beginning later Saturday morning (after 10 a.m. for most). Amounts will be generally up to .20 of an inch. Temps are at their highs Saturday morning with front moving southward across the area now, and wet bulbing will take then lower in the afternoon.  Saturday evening, we probably stay mainly in the clouds, but there may be breaks here and there, especially to the north, and although the northern half of area will be dry Sunday, the front stalling to the south will moisten and allow some precip to evolve off to the south and southwest.

This precip will spread back in from southwest to northeast Sunday and the fresh, colder, drier air high pressure sliding by to the north will set the stage for some of the precipitation to be frozen for a time Sunday night into Monday morning. That frozen precip lasts longest N and W with temps at or below freezing for a time before changing to all rain everywhere by end of the day. So we are currently thinking the highest threat for slick conditions on roads will be to the north and west later Sunday and Monday morning.

A complex storm system eventually sends a cold front across the area early Tuesday morning and we turn briefly milder before upper level low to the north and northeast gets us in chilly flow again Wednesday and Thursday and into Friday. No big storms are expected with the chill Wednesday through Friday, but instability with deepening trough/upper level low could have enough moisture to bring a brief sprinkle or flurry Wednesday afternoon or evening, mainly to the northwest.

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