Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains
The interaction of a moisture-laden Pacific southwesterly flow, known as “Pineapple Express”, with very cold air from a strong arctic outbreak during 1 – 5 December 2007 produced a record number of high impact weather events across British Columbia of Canada. Among the weather hazards are bitterly c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.629.6698 2023-05-15T14:57:45+02:00 Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains Ruping Mo Quanzhen Geng Mindy Brugman Greg Pearce Jim Goosen Brad Snyder The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.629.6698 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.629.6698 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://ams.confex.com/ams/pdfpapers/154212.pdf text ftciteseerx 2016-01-08T15:23:21Z The interaction of a moisture-laden Pacific southwesterly flow, known as “Pineapple Express”, with very cold air from a strong arctic outbreak during 1 – 5 December 2007 produced a record number of high impact weather events across British Columbia of Canada. Among the weather hazards are bitterly cold wind chills, heavy snow, freezing rain, heavy rain, and strong winds. The unusual collision of two contrasting air masses caused unprecedented forecast challenges for both the Global Environmental Multiscale (GEM) models and meteorologists at the Pacific Storm Prediction Centre (PSPC) of Environment Canada. In this study, the evolution of the weather systems and the observed severe weather events during this storm cycle are analyzed. Weather forecasts by the GEM models and PSPC meteorologists are compared with the observed high impact weather events during the storm. It is demonstrated that meteorologists at PSPC greatly improved the model forecasts by considering various local effects of the complex terrain in British Columbia that the GEM models cannot resolve well. In particular, with warm advection aloft, it is acknowledged that the GEM regional model tends to underestimate the cold air entrenched in some narrow valleys. The model guidance was therefore doomed to failure at forecasting the widespread and prolonged freezing rain in the midst of the storm. Text Arctic Unknown Arctic British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Pacific |
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ftciteseerx |
language |
English |
description |
The interaction of a moisture-laden Pacific southwesterly flow, known as “Pineapple Express”, with very cold air from a strong arctic outbreak during 1 – 5 December 2007 produced a record number of high impact weather events across British Columbia of Canada. Among the weather hazards are bitterly cold wind chills, heavy snow, freezing rain, heavy rain, and strong winds. The unusual collision of two contrasting air masses caused unprecedented forecast challenges for both the Global Environmental Multiscale (GEM) models and meteorologists at the Pacific Storm Prediction Centre (PSPC) of Environment Canada. In this study, the evolution of the weather systems and the observed severe weather events during this storm cycle are analyzed. Weather forecasts by the GEM models and PSPC meteorologists are compared with the observed high impact weather events during the storm. It is demonstrated that meteorologists at PSPC greatly improved the model forecasts by considering various local effects of the complex terrain in British Columbia that the GEM models cannot resolve well. In particular, with warm advection aloft, it is acknowledged that the GEM regional model tends to underestimate the cold air entrenched in some narrow valleys. The model guidance was therefore doomed to failure at forecasting the widespread and prolonged freezing rain in the midst of the storm. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ruping Mo Quanzhen Geng Mindy Brugman Greg Pearce Jim Goosen Brad Snyder |
spellingShingle |
Ruping Mo Quanzhen Geng Mindy Brugman Greg Pearce Jim Goosen Brad Snyder Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
author_facet |
Ruping Mo Quanzhen Geng Mindy Brugman Greg Pearce Jim Goosen Brad Snyder |
author_sort |
Ruping Mo |
title |
Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
title_short |
Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
title_full |
Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
title_fullStr |
Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
title_full_unstemmed |
Collision of a Pineapple Express with an Arctic Outbreak over Complex Terrains |
title_sort |
collision of a pineapple express with an arctic outbreak over complex terrains |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.629.6698 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Arctic British Columbia Canada Pacific |
geographic_facet |
Arctic British Columbia Canada Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
https://ams.confex.com/ams/pdfpapers/154212.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.629.6698 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766329878202810368 |