Credit our sources in the help, provide the expected time of forecast…

… publication, and mention the fact that URLs can be bookmarked for a specific model

frontend/src/Burger.tsx

@@ -53,7 +53,6 @@ export const Burger = (props: {
  ['Documents', 'https://soaringmeteo.org/docs.html'],
  ['soarGFS', 'https://soaringmeteo.org/GFSw/googleMap.html'],
  ['soarWRF', 'https://soaringmeteo.org/soarWRF'],
- ['soarV2', 'https://soarwrf1.soaringmeteo.org/v2']
  ]
 
  const options =

frontend/src/help/Help.tsx

@@ -2,7 +2,7 @@ import { createSignal, JSX, lazy, Match, Show, Switch } from 'solid-js'
 import {bottomButtonsSize, keyWidth, meteogramColumnWidth, soundingWidth, surfaceOverMap} from '../styles/Styles';
 import * as fakeData from './data';
 import { showDate, xcFlyingPotentialLayerName, inversionStyle } from '../shared';
-import { type Domain } from '../State';
+import {type Domain, gfsModel, wrfModel} from '../State';
 import { Overlay } from '../map/Overlay';
 import hooks from "../css-hooks";
 
@@ -75,11 +75,23 @@ const MapHelp = (props: { domain: Domain }): JSX.Element => {
  <p>
  What you see is the weather forecast for { showDate(state.forecastMetadata.dateAtHourOffset(state.hourOffset), { timeZone: props.domain.timeZone() }) },
  from the model { props.domain.modelName() } initialized at { showDate(state.forecastMetadata.init, { timeZone: props.domain.timeZone() }) }.
+ <Switch>
+ <Match when={ props.domain.state.model === gfsModel }>
+ {' '}The results of the <a href="https://www.ncei.noaa.gov/products/weather-climate-models/global-forecast" target="_blank">GFS model</a> are provided by the <a
+ href="https://www.noaa.gov/">NOAA</a>. The results are published every day around 07:00 and 19:00 CEST.
+ </Match>
+ <Match when={ props.domain.state.model === wrfModel }>
+ {' '}We operate the <a href="https://www.mmm.ucar.edu/models/wrf" target="_blank">WRF model</a> on our own
+ servers, and we configured it to cover the Alpine region. The results are published every day around 05:00,
+ 11:00, 17:00, and 23:00 CEST.
+ </Match>
+ </Switch>
  </p>
  <p>
  Use the top-left menu to select which information to display on the map (cross-country flying potential,
  thermal velocity, wind speed and direction, etc.). You can also select a different weather forecast model,
- or a different area of the world.
+ or a different area of the world (tip: bookmark the page after you selected your favorite model and
+ geographical zone).
  </p>
  <Show when={ state.primaryLayerEnabled }>
  <p>