Results 61 to 70 of about 1,187,144 (257)
Assessing the impact of model biases on subseasonal forecast skill
Quarterly Journal of the Royal Meteorological Society, EarlyView.Relaxation experiments where the nudging was performed towards bias‐corrected integrations of the same model display significantly improved skill at weeks 3 and 4, particularly in the northern extratropics. This indicates that there is a large potential for improving dynamical subseasonal forecasting skill by improved treatment of model biases.
Frédéric Vitart, Magdalena Balmaseda
wiley +1 more source
A Synoptic Analysis of Cyclonic Activity During 1961-2003 [PDF]
مخاطرات محیط طبیعی, 2012 Mid-latitude cyclones play an important role in precipitation over Iran. A survey on 6-hourly geopotential height of 1000 hPa level showed that the number of cyclones in the studied area reveals a positive trend.
Seyyed Abolfazl Masoodian
doaj +1 more source
Estimation and Investigation of Geopotential and Scale heights over Iseyin, Nigeria [PDF]
International Journal of Current Science Research and Review, 2021 In this study, the monthly averaged daily mean temperature, relative humidity and surface pressure data obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF) during the period of thirty eight (1979 – 2016) years were used to estimate the monthly variation of geopotential and scale heights for Iseyin located in the South Western ...
openaire +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.The predictability of western and eastern North Pacific blocking events is assessed using analogue‐based diagnostics. Eastern blocks exhibit lower predictability, characterized by faster error growth and higher mean logarithmic divergence rates. The study highlights geographical contrasts in blocking stability.
Anupama K. Xavier +3 more
wiley +1 more source
Forecast verification using information and noise
Quarterly Journal of the Royal Meteorological Society, EarlyView.Verification of weather forecasts is usually expressed in terms of total error metrics. This is useful for end users of the forecasts but does not allow evaluation of the intrinsic information content of the forecasts. To overcome this limitation, we propose a new total error decomposition into information and noise error measures, connect it to ...
Massimo Bonavita, Alan J. Geer
wiley +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.Short‐term extreme rainfall can be produced by the variation of low‐level warm moist airflow during mesoscale convective systems (MCSs) approaching another. The cold outflow of the rapidly moving MCS intensifies the warm moist airflow in front, enhancing the convergence and ascending motion in the quasi‐stationary MCS.
Xiaoyu Gao +3 more
wiley +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.This study investigates year‐round exceptionally poor and good day‐6 forecasts of the 500‐hPa geopotential height field over Europe using 45 years of ERA5 reforecasts and applies a weather regime perspective to analyse large‐scale pattern evolution and regime transitions.
Seraphine Hauser +4 more
wiley +1 more source
Features of the baric field at the Earth’s surface in July in the Northern and Southern hemispheres during different natural climatic periods [PDF]
Известия Саратовского университета. Новая серия: Серия Науки о ЗемлеThe article examines the nature of changes in the pressure field at the Earth’s surface around the globe during two natural climatic periods ofthe Earth’s climate system –the stabilization period andthe secondwave of globalwarming in ...
Morozova, Svetlana Vladimirovna +1 more
doaj +1 more source
Covariance of the intertropical discontinuity and African easterly jet in Sahelian wet and dry years
Quarterly Journal of the Royal Meteorological Society, EarlyView.Intertropical discontinuity and African easterly jet (AEJ) positions are strongly correlated, with a more pronounced linear relationship across wet years. Surface heat flux anomalies modify low‐level temperature and sensible heat flux gradients that shift the AEJ core south of the gradient maxima in both composites.
Marian Amoakowaah Osei +4 more
wiley +1 more source
Quarterly Journal of the Royal Meteorological Society, EarlyView.Using hectometric Weather Research and Forecasting simulations, we examine how urban blue spaces mitigate extreme summer heat in northwestern European cities through neighbourhood‐scale cooling mechanisms. Results show horizontal advection dominates cooling by mixing cooler air from waterbodies with warmer urban air, providing ∼50W·m−2$$ \sim 50\kern0 ...
Xuan Chen +5 more
wiley +1 more source