ARCTIC SEA ICE –Ralph’s Back!–

After a period of relative calm, when Byoof (The Beaufort High) ruled the roost and sun could get to work on the yearly thaw, low pressure has loop-de-looped north from the Siberian coast, and Ralph (anomalous low pressure) has retaken the Pole. (Maps created by Dr. Ryan Maue at the Weatherbell site [week free trial available.])

Ralph 2017 1 gfs_precip_mslp_arctic_2

Ralph will tend to slow the melting, for two reasons. First, the clouds block the sunshine. Second, summer storms at the Pole seem to create cold, perhaps utilizing evaporative cooling in the manner of a summer thunderstorm. Even when the precipitation largely evaporates (or sublimates) before reaching the ground, temperatures can be lowered a degree or two, and at the Pole that is the difference between temperatures just above freezing and temperatures just below.

Ralph will meander weakly about the Pole for the next few days, and then the GFS model sees Ralph reinvigorated by a sort of secondary moving north from east Siberia, and becoming our first gale of the summer.  Of course, we will have to wait and see if the computer is correct, but the current forecast is impressive, with pressures dropping to 966 mb in five days.

Ralph 2017 2 gfs_precip_mslp_arctic_20

 

If such a gale manifests we will not merely be talking about a dusting of snow, but several inches, and also the winds will increase:

Ralph 2017 3 gfs_mslp_uv10m_arctic_20

Once the winds get over gale force the ice tends to be crunched and broken. This will be our first opportunity to see if the water under the ice holds enough mildness to melt ice, as occurred in the summer gale of 2012, or is so cold it melts little ice, as occurred in the summer gale of 2013.

The Canadian JEM model also shows the gale. As usual it sees a stronger storm, though it takes longer to develop.

Ralph 2017 4 cmc_mslp_uv10m_arctic_24

The Jem model also sees colder resultant temperatures associated with the the gale, (again as is usually the case.)

Ralph 2017 5 cmc_t2m_arctic_27

Stay tuned!

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2 thoughts on “ARCTIC SEA ICE –Ralph’s Back!–

  1. Still looking cool on Daily Mean Temperatures North of 80 degree North on 20th June.

    Was that pre-return as there was a little spike higher?

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