Airmass

The top of the “anvil” that you see at the top of a thunderstorm is actually the level at which buoyant parcels reach equilibrium with the surrounding airmass, which is generally isothermal (in the vertical) at that height (i.e., the tropopause). ❋ Unknown (2006)

Tomorrow Wednesday: Sunshine is abundant and while the airmass is still cold, high temperatures should climb into the low-to-mid 40s. ❋ Unknown (2011)

Near average temperatures appear to be on tap, in the low 50s Monday up to, perhaps, upper 50s Tuesday should the airmass modify over our region. ❋ Unknown (2011)

In that pattern, Arctic airmass after Arctic airmass originating from northern Canada dove southeast, driving windy cold fronts through the region. ❋ Unknown (2011)

Any of a number of subtle changes to the airmass and its trajectory over the ocean could make dramatic differences to the eventual outcome. ❋ Unknown (2011)

Jeff Masters at Weather Underground explains the cause of the storm: A potent jet stream with strong winds will dive southwards over the central U.S. today, allowing a cold Arctic airmass to spill southwards out of Canada. ❋ Jason Samenow (2011)

A rather warm and dry airmass to the west builds over the region for Wednesday and Thursday. ❋ Unknown (2010)

The temperature of of the lower atmosphere over land areas is controlled principally by conduction with the solid surfaces of the ground, and to a usually much lesser extent by solid particulates suspended in the airmass itself. ❋ Unknown (2007)

But, if the airmass at the same temperatures becomes saturated enough to produce fog condensed water droplets the rate of diminution of the snow cover increases dramatically. ❋ Unknown (2007)

Warm air is NEVER blown into a city at night from rural in a neutral airmass. ❋ Unknown (2007)

So higher desert temperatures have a lot to do with where the airmass originated and the effect of an intervening mountain range. ❋ Unknown (2007)

Add a snow-cover and you can have readings over 20° F different between the rural and urban site even when both points are in the same airmass. ❋ Unknown (2007)

For example, snow cover will diminish slowly under the advection of a warm, dry airmass. ❋ Unknown (2007)

However, the dry airmass does promote clear skies and hence increased insolation which allows more radiant energy to reach and heat the ground and elevate the surface air temperatures by conduction and the lowest levels in the atmosphere by convection. ❋ Unknown (2007)

If a warm front or airmass change is occurring then yes, of course but otherwise no. ❋ Unknown (2007)

Looking at a synoptic weather chart over artic airmass source regions during the coldest parts of winter reveals extremely dense “high pressure” at the surface, but very low geopotential heights aloft. ❋ Unknown (2007)

That is some amazingly low latitude penetration of a cP airmass especially for so late in the year. ❋ Unknown (2007)

I witnessed a radical temp change in mid summer one night with the airmass static. ❋ Unknown (2007)

This is partially a result of the effectiveness of radiational cooling at the ground surface under the instrumentation and the lack of advection of warmer temps either laterally from nearby warmer areas or vertically by convection since the cold air forming at the ground from radiationaal cooling and in the airmass immediately above by conduction is quite stable. ❋ Unknown (2007)