While there was no thunder, a nearly stationary band of rates likely as high as 2"/hour was situated across NE NC (just to the north of the Elizabeth City) for a couple hours during the early morning. Model cross sections even showed some hints that there might have been some very weak elevated, upright instability across extreme SE VA and NE NC. The most intense snowfall (perhaps 1-2"/hour in narrow bands) was observed between 11 PM and 5 AM across SE VA and NE NC, where there was slantwise instability present (as evidenced by negative equivalent potential vorticity (EPV). The snow ended from west to east between 2 and 7 AM on 1/22 as the mid level shortwave quickly crossed the area. The snow started to reach the ground by 10-11 PM in the Richmond metro area while rates increased further across SE VA and NE NC. Travel conditions deteriorated quickly during the overnight hours, as the snow stuck to roads immediately with temperatures well below freezing (even in Hampton Roads/NE NC). Rates slowly increased through the late evening hours as the snow gradually inched to the north and northwest (radar returns were showing snow aloft across the entire area but the dry air caused it to sublimate before reaching the ground). Light snow overspread SE VA and NE NC during the late afternoon-evening of the 22nd. No snow was reported north and west of the Richmond Metro/Farmville/Cambridge. The cold, dry air in the low-levels limited snow amounts across central and northern portions of the area. At the surface, ~1040mb high pressure to our north funneled cold, dry Arctic air in the low levels toward our area while the surface low gradually deepened as it tracked NE off the Carolina coast. With temperatures not getting out of the 20s across the area during the day on 1/22 (and sufficiently cold air aloft), this was one of the uncommon events where precipitation fell in the form of snow across (nearly) the entire area. The sharpening shortwave approached the area on 1/22 before crossing the area during the early morning hours on 1/23. This shortwave slowly sharpened and took on a more neutral tilt as it tracked to the east (toward the local area) during the day on 1/22 as surface low pressure developed along the stalled front well to our south (off the Carolina coast). This feature played a key role in helping to generate the lift necessary for the significant snowfall that was observed. Meanwhile, a positively tilted shortwave trough dropped south from the northern Plains to the central Plains during the night of 1/21 through the morning of 1/22. Up to 1" of snow fell from the late afternoon on 1/21 through the early morning on 1/22 following the Arctic cold frontal passage. Also, there are other equivalency calculators out there that are slightly different ( McMillan has one that I’ve used in the past).An Arctic cold front crossed the area during the late morning through afternoon hours on January 21st, before moving well to the south of the area by the morning of January 22nd. Some of this info is available in other places on the web. I think this is extremely useful on the roads, because the calculator does the work in terms of letting you know what pace to start at. For example, my half marathon time is equivalent to a 2:38:50 marathon, a 16:33 5k, etc. Not only does the app help you out with training paces, it includes equivalent times for other distances. The calculator informed me that my easy pace is 6:56-7:21/mile, my marathon pace is 6:03/mile, my threshold pace is 5:45/mile, my interval pace is 5:17/mile and my repetition pace is 4:53/mile (the app also includes definitions of these terms). It assesses fitness level, determines proper training paces and an equivalent race performance at a different race distance. The calculator informed me I had a VDOT of 62.Īccording to the app, VDOT is a score or measure of a race performance. I haven’t done a lot of road racing lately, so I punched in a half marathon time from last year. I downloaded the app and started with the calculator. If anyone knows about training and racing, it’s Jack. It’s called VDOT Running Calculator and it was designed with Jack Daniels. Howdy! Today’s post is about a nifty app that I was introduced to this morning.
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