Ben niet zo vertrouwd met dit soort kaartjes maar de tekst erbij was duidelijk.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHEASTERN FRANCE, BENELUX, NORTHWESTERN GERMANY
GENERAL THUNDERSTORMS ARE FORECAST ACROSS CENTRAL BRITISH ISLES, EASTERN FRANCE, ALPINE REGION, NORTHERN AND NORTHEASTERN MEDITERRANEAN, WESTERN IBERIAN PENINSULA
SYNOPSIS
BROAD RIDGE PLACED OVER EUROPE ... AND WEAK SHORT-WAVE TROUGHS WEST OF IBERIAN PENINSULA AND OVER EXTREMELY EASTERN EUROPE COMPLETE A STABLE OMEGA FLOW PATTERN. WARM AIRMASS AFFECTS SOUTHERN AND WESTERN EUROPE.
DISCUSSION
...WESTERN CENTRAL EUROPE...
OVER SOUTHERN AND WESTERN CENTRAL EUROPE AIRMASS WITHIN THE BOUNDARY LAYER IS QUITE WARM AND MOIST ... WITH DEWPOINTS IN THE ORDER OF 10C AT 850 HPA. SOUTHWEST OF THE SURFACE PRESSURE HIGH THIS AIRMASS SPREADS NORTHWESTWARD SLOWLY. ABOVE THE BOUNDARY LAYER ... WELL MIXED AIRMASS IS SITUATED IN THE ALPINE REGION AND WEST OF IT ... AND SHOULD SPREAD NORTHWARD. AS A CONSEQUENCE, HIGH CAPE VALUES ARE FORECAST OVER WESTERN CENTRAL EUROPE TOMORROW. DIURNAL HEATING SHOULD ALLOW FOR THUNDERSTORM DEVELOPMENT OVER NORTHEASTERN FRANCE, BENELUX, AND WESTERN GERMANY ... AND ISOLATED LARGE HAIL, STRONG WIND GUSTS /ESPECIALLY TO THE SOUTH, WHERE SPREAD SHOULD BE HIGHEST/ AND FLASH FLOODING IS EXPECTED. OVER MOST OF THE AFFECTED REGION ... VERTICAL WIND SHEAR WILL BE RATHER WEAK, BUT SHOULD INCREASE JUST SOUTH OF THE NORTH SEA DUE TO NORTHERLY SEA-BREEZE WINDS, AND A CHANCE OF MESOCYCLONES EXISTS IN THIS REGION. LARGE HAIL, DAMAGING WIND GUSTS AND HEAVY RAINFALL WITH A CHANCE OF FLASH FLOODING SHOULD BE THE MAIN SEVERE THREAT, A TORNADO IS NOT RULED OUT. SYNOPTIC-SCALE FORCING SHOULD STRENGTHEN IN THE AFTERNOON AS POOR DEVELOPED SHORT-WAVE TROUGH REACHES BENELUX, AND THUNDERSTORMS COULD POSSIBLY GO ON THROUGH THE NIGHT.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHEASTERN FRANCE, BENELUX, NORTHWESTERN GERMANY
GENERAL THUNDERSTORMS ARE FORECAST ACROSS CENTRAL BRITISH ISLES, EASTERN FRANCE, ALPINE REGION, NORTHERN AND NORTHEASTERN MEDITERRANEAN, WESTERN IBERIAN PENINSULA
SYNOPSIS
BROAD RIDGE PLACED OVER EUROPE ... AND WEAK SHORT-WAVE TROUGHS WEST OF IBERIAN PENINSULA AND OVER EXTREMELY EASTERN EUROPE COMPLETE A STABLE OMEGA FLOW PATTERN. WARM AIRMASS AFFECTS SOUTHERN AND WESTERN EUROPE.
DISCUSSION
...WESTERN CENTRAL EUROPE...
OVER SOUTHERN AND WESTERN CENTRAL EUROPE AIRMASS WITHIN THE BOUNDARY LAYER IS QUITE WARM AND MOIST ... WITH DEWPOINTS IN THE ORDER OF 10C AT 850 HPA. SOUTHWEST OF THE SURFACE PRESSURE HIGH THIS AIRMASS SPREADS NORTHWESTWARD SLOWLY. ABOVE THE BOUNDARY LAYER ... WELL MIXED AIRMASS IS SITUATED IN THE ALPINE REGION AND WEST OF IT ... AND SHOULD SPREAD NORTHWARD. AS A CONSEQUENCE, HIGH CAPE VALUES ARE FORECAST OVER WESTERN CENTRAL EUROPE TOMORROW. DIURNAL HEATING SHOULD ALLOW FOR THUNDERSTORM DEVELOPMENT OVER NORTHEASTERN FRANCE, BENELUX, AND WESTERN GERMANY ... AND ISOLATED LARGE HAIL, STRONG WIND GUSTS /ESPECIALLY TO THE SOUTH, WHERE SPREAD SHOULD BE HIGHEST/ AND FLASH FLOODING IS EXPECTED. OVER MOST OF THE AFFECTED REGION ... VERTICAL WIND SHEAR WILL BE RATHER WEAK, BUT SHOULD INCREASE JUST SOUTH OF THE NORTH SEA DUE TO NORTHERLY SEA-BREEZE WINDS, AND A CHANCE OF MESOCYCLONES EXISTS IN THIS REGION. LARGE HAIL, DAMAGING WIND GUSTS AND HEAVY RAINFALL WITH A CHANCE OF FLASH FLOODING SHOULD BE THE MAIN SEVERE THREAT, A TORNADO IS NOT RULED OUT. SYNOPTIC-SCALE FORCING SHOULD STRENGTHEN IN THE AFTERNOON AS POOR DEVELOPED SHORT-WAVE TROUGH REACHES BENELUX, AND THUNDERSTORMS COULD POSSIBLY GO ON THROUGH THE NIGHT.
