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Reliability and sharpness diagrams

Description of reliability and sharpness diagrams used to verify seasonal forecasts.

The terms 'reliability' and 'sharpness' used here have specialist meteorological definitions. For more details on reliability and sharpness diagrams please refer to the WMO SVS document and references therein. Standardised Verification System for long-range forecasts The ROC scores discussed

Mountain weather

Peak District - Mountain weather forecast

The National Park itself covers an area of 555 square miles with a high point on Kinder Scout of 636 metres. Despite its name, the landscape generally lacks sharp peaks, being characterised by rounded hills and gritstone escarpments. Despite what its name may suggest, the Peak District is similar

Mountain weather

A first peak - bag yours in the Yorkshire Dales

on the way down. Horton is easy to get to by car or train and there are cafes and pubs in the village to celebrate at the end of your walk. Sharp Haw Sharp Haw lies close to Skipton and is a distinctive pointy peak with a trig point. It is a popular first climb with most people going up and down

Observed and forecast tracks: southern hemisphere 2015-16

a sharp reversal in direction towards the south-east and extra-tropical transition. Although the turn did occur, it was much later and slower than in these forecasts. Tropical cyclone names South-West Indian observed tracks in 2015-16 Australian (90-160°E) Name & ID Start & end dates Central pressure, 1

Technical User Guide

to skill assessment The verification procedures used to measure the performance of the seasonal forecasts are those recommended by the Standardised Verification System (SVS) for long-range forecasts (LRF) developed by the Commission for Basic Systems (CBS) of the World Meteorological Organization (WMO). Relative operating characteristic (ROC) Reliability and sharpness diagrams

Observed and forecast tracks: southern hemisphere 2020-21

to or below the recent mean value. Guambe (21S) 17-22 February 953 mb, 85/85 knots There was an early right-of-track bias in forecasts and a general slow bias meaning track errors were higher than the recent mean value. Habana (24S) 04-16 March 940 mb, 130/110 knots Habana had an unusual track with sharp

Budapest weather

Celsius and snow is possible too. Spring Springs in Budapest start cold and cloudy with early March still prone to snow. However temperatures take a sharp upturn through the season with average daily highs rising from 11.5 Celsius in March to 22.7 Celsius by May. Sunshine amounts increase through


How we measure rainfall

for the measurement of daily rainfall has been the 0900 UTC reading made by an observer from a 5 inch storage rain-gauge. The gauge has a sharp brass or steel rim of diameter 5 inches (127 mm), sited 30 cm above ground level with a funnel that collects rain in a narrow necked bottle placed in a removable can

Observed and forecast tracks: northern hemisphere 2012

(22W) 07-19 October 100/90 knots Track forecast errors were below last season's average and skill scores very high. The temporary slow down and reversal in direction was well predicted from three days in advance. Maria (23W) 14-19 October 55/50 knots The sharp right turn of Maria was poorly predicted


Warm, sunny with some thunderstorms this Bank Holiday

. The best of the sunshine will still be across Scotland and Northern Ireland through the weekend, where temperatures will be widely in the low to mid 20s. Northern Ireland won’t escape the thunderstorm risk however, with the possibility of some sharp showers here on Sunday. With the warm weather

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