Anomalous Weather Happening In Far North: Could This Be Related to the ‘Stratospheric Warming’ At The SOUTH Pole?

Within the past several days, weather phenomena that wouldn’t be out of place in the U.S. South happened in the far north…

  • Sea ice is running neck and neck with 2012 for the lowest values on record for this time of year.
  • Wildfires are ringing the Arctic, pouring more carbon dioxide into the air than in any comparable period in 17 years of satellite observing.
  • Alaska saw its hottest month by far in almost a century of recordkeeping.
  • And a surge of warm air with origins in last month’s record-devouring European heat wave pushed across Greenland at the end of July, melting 55 million tons of sea ice in five days. That’s an unprecedented rate in satellite records, and more than three times the average melt rate for 1981-2010.

Greenland‘s ice sheet was melting at an unprecedented rate between 30 July and 03 August. The melt runoff was estimated at 55 billion tons or about 40 billion tons more than the 1981 – 2010 average for this same period.

And the moisture plume itself is already a record-breaker. At several locations separated by hundreds of miles, Tuesday brought the wettest atmosphere ever observed in the 70-plus years since regular radiosondes (weather balloons) have been launched over Alaska. This is based on precipitable water (PW), the amount of moisture in a column of air above the surface.

According to climatologist Brett Brettschneider, the following locations set all-time PW records:

Bethel, 12Z Tuesday:  1.86” (old record 1.77” from August 6, 1956)
Fairbanks, 0Z Wednesday:  1.59” (old record 1.57” from July 13, 1971)
Anchorage, 0Z Wednesday:   1.76” (old record 1.67” from August 26, 1990)

For perspective:

  • There was more moisture in the air on Tuesday night above Anchorage than there was above Corpus Christi, Texas (1.73”), which sits on the Gulf Coast.
  • The amount of water above Anchorage would have beaten the all-time record for Salem, Oregon (1.73”).

With the main jet stream absurdly far north, parts of southeast Alaska that are typically moist have been markedly dry this month. Even with the record amount of moisture sitting above it, Anchorage was able to squeeze out only a trace of rainfall on Tuesday. The city has seen no measurable rain all month — something that’s occurred on August 1-13 only once before (1969) in airport records going back to 1954. No rain is expected in Anchorage for at least the next week.

Juneau hasn’t seen measurable rain since July 29, making this the first August in 124 years of recordkeeping to go this long without rain. The city could get some sprinkles or spritzes starting Wednesday, and perhaps a bigger dose of rain toward the weekend.

Lightning Hits Near the North Pole?

Social media lit up this past weekend when a total of 48 lightning discharges were reported north of 85°N latitude, or within about 450 miles of the North Pole. The lightning came from low-topped, elevated thunderstorms that occasionally pop up over the Arctic, but seldom so close to 90°N. Elevated storms develop when moist, unstable air sits above cooler, more stable air near the surface. In this case, a surge of warm air swept toward the pole, riding atop much cooler air just above the mostly ice-covered central Arctic Ocean.


As it turns out, not all of these flashes were lightning strikes reaching the surface. Lightning is typically classified as intracloud (IC) or cloud-to-ground (CG) flashes. Of these, only a CG flash actually strikes the ground (or ocean); IC flashes play out above ground level.

The lighting near the North Pole was detected by the proprietary GLD360 monitoring system deployed by Vaisala, which is distinct from NASA’s satellite-based lightning sensors, whose coverage doesn’t quite extend to the planet’s north and south poles. GLD360 detects the electromagnetic signal produced by lightning flashes around the world, estimating the peak current and polarity of each discharge.

What’s most impressive about last weekend isn’t that lightning was detected so close to the North Pole, but that there was so much of it. Since observations began in 2012, only three prior lightning events were detected north of 85°N, and they produced a total of just nine flashes. By comparison, last weekend brought a total of 48 flashes to that region. All but seven of those were CGs.

In the larger area north of 80°N, a typical summer brings two to five events, with several dozen flashes in all. No single event on record had produced more than about 50 flashes until July 2018, when just over 300 flashes were observed on a single day. Last weekend, more than 1000 flashes were detected. About 80% of these were CGs.

Warmest Upper Levels on Record for Southwest Alaska Possible This Week

The upper-level ridging that’s scrunched Alaskan weather features north of their usual locations will peak later this week, in what could bring unprecedently warm air at upper levels. The 500-millibar pressure level — about midway up through the atmosphere’s mass — rises and falls as the atmosphere below it warms and cools.

Typically in August, the 500-mb surface is located about 562 decameters (18,400 feet) above Alaska. But by Thursday and Friday, both the GFS and European models are projecting that the 500-mb heights will soar to at least 590 dm, and perhaps above 594 dm, from southwest Alaska and the far northern Gulf of Alaska into the southeast Bering Sea.

These “high heights” will likely challenge some all-time records. Below is a sampling of such records for Alaska as compiled by Brettschneider. I’ve highlighted some locations to watch in bold.

Location, record-highest 500-mb height (in meters), date

Cold Bay, 5965, 8/14/1952
St. Paul, 5912, 8/10/1956
Kodiak, 5938, 8/11/1956
Anchorage, 5905, 8/12/2005
King Salmon, 5935, 8/11/1956
Barrow, 5869, 8/1/2002
Kotzebue, 5900, 8/1/2002
Nome, 5916, 6/25/1953
McGrath, 5920, 6/26/1953
Fairbanks, 5885, 8/11/2005
Yakutat, 5984, 7/24/2009
Annette Island, 5957, 9/7/1989
Shemya, 5970, 8/5-6/1981

Original Article:

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