The March warmth was due to a high
pressure ridge over Alaska and northwest Alaska that lasted two weeks.
An important mesoscale feature of this event is a low-level
pressure ridge and associated northerly flow that developed over the western side of the Central Valley of Northern California; as this
pressure ridge extended southward, strong pressure gradients and associated gusty northerly and northeasterly winds moved toward and over the Wine Country region.
He hit a
pressure ridge in the ice, wrapping the front prop around the cowling and stopping its rotation.
A massive high
pressure ridge, with a clockwise circulation of air around it, will pump hot, dry air filled with dust from the Sahara Desert into the Iberian Peninsula through the weekend.
Every time we neared a climbable
pressure ridge, he would stop to glass, scanning the ahead.
The National Weather Service reported 17 daily heat records were broken in Southern California on Sunday, because of a high
pressure ridge over the Four Corners region of the Southwest.
A cold front is by definition the estimated position of the interactive zone between a low pressure col and a high
pressure ridge behind it.
Occasional breaks in the ride occurred when we would encounter a
pressure ridge, which is a place where the sea ice heaves up into a miniature mountain range.
Earlier the same day both had taken dramatic falls, with 33-year-old Parks ending up "dazed" after he slipped on another
pressure ridge and was hit on the head by his 50kg sleigh.
On several occasions the sleds actually left the ground as they hurtled back down the other side of a
pressure ridge before crashing into the next wall of ice.
Efforts to secure a hovercraft barge to cut a channel for the whales were stymied by technical problems and an impregnable 30-foot-high
pressure ridge. Ron Morris, with the NMFS office in Anchorage, and Eskimos began using chain saws on 15 October to enlarge the shrinking breathing holes.