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Waar baseert u zich op om een UV-index te voorspellen tot op 0.1 nauwkeurig?
Het KMI hanteert een schaal die slechts tot 10 gaat. Op andere websites zie ik nog andere verdelingen (vb wikipedia heeft een klasse 8-10 en een klasse 11+), maar wat is het nut van kommagetallen?

Mvg,
Frederiek Mathijs

Fritz

I realize only now, I should have included an important property of the coastal jet.
This jet is highly ageostrophic (not balanced by Coriolis).
Any Coriolis effect (given sufficient time and if not blocked) enhances ridging.
This jet is down pressure gradient (initial + isallobaric); balanced by friction (antitriptic).
Thus isobars are coast oblique (not parallel or perpendicular). Over high ground MSL isobars are “artificial”.
The coastal (low level) jet is along orography and not necessary a high wind event (> 30kt).
Good set of upper maps is found at Meteo Peru http://www.senamhi.gob.pe/site/parac/?p=020

Salut! Evert Polman

I follow Stad Amsterdam daily, and am a keen reader of your forecasts.
Been at sea 39 years professional; I retired 10 years ago; still devoting much time to leisure sailing.
I wish to place some, well intentioned, remarks on sailing under a mountanous coast.
Looking at topography there is the Andes; and at upper flow maps there is a Wly flow (Sub Tropical Jet).
In a highly stable troposphere (Upper Ridge / surface High) this Wly flow induces “windward ridging” an “leeward troughing”.
Oblique onshore winds enhance ridging and induce a Sly Coastal Jet.
The upper flow, across Andes, induces a Leeward Trough; enhanced and kept stationary by a foehn wind.
The approach of a Upper Trough will initiate the Ely departure of the Lee Trough and possibly develop as new Low (over Uraquay)
In the ridge along subtropical Chile, adiabatic heating (strong subsidance) causes secondary Coastal Troughing.
This often induces a shallow Coastal Low and a Coastal Wind Reversal. The CL desipates on the approache of an Upper Trough / Low.
On landfall of a wave-Low, the Warm Front induces ridging and a Nly Barrier Jet.
The Cold Front splits and the position of the surface CF adapts to coastal topography. The primary Low moves, offshore, poleward.
The coastal trapped warm sector is stormy, with high winds from barrier jet and possible prefrontal jet (ahead CF).
On surface analysis map, there is only a “telecommunication” between Marquesas High and continental lows.
Pacific Lows and fronts do not make it across the Andes. Lee Troughs have no fronts.

Salut! Evert Polman

Hopelijk valt de rest van de expeditie vanaf nu beter mee.

Groetjes,
5A van de Klim-Op te Zoersel

Eric and Sarah McNair-Landry crossed the Gobi desert only using man and wind power.Weather4expeditio [...]…