Stepwise Onset of Monsoon Weather Observed in the Nepal Himalaya

Ueno, K.; Toyotsu, K.; Bertolani, L.; Tartari, G.
July 2008
Monthly Weather Review;Jul2008, Vol. 136 Issue 7, p2507
Academic Journal
Mountain weather changes in the Nepal Himalaya were intensively examined during the 2003 monsoon onset using in situ datasets, observed by multiple automatic weather stations (AWS) distributed across the Coordinated Enhanced Observing Period (CEOP) Himalaya reference site at locations with significant differences in altitude. Onset of monsoon rainfall characterized as nighttime precipitation was initiated simultaneously at all stations with the occurrence and migration of a monsoon depression in the north of the Bay of Bengal. Satellite infrared images detected evident suppression of diurnal cloud development after the onset. About two weeks prior to the onset, the mountain weather abruptly changed such that the daytime valley wind at lower elevations weakened associated with morning clouds and the nighttime southerly wind began at upper elevations. The timing corresponded with the weakening of the westerly wind over the Himalaya due to the northward shift of the upper subtropical jet stream. The time lag between the precipitation onset and the change in the mountain weather was confirmed by 9 yr of in situ AWS data. The mechanism of nighttime southerly winds at high elevations is also discussed in relation to large-scale monsoon flow and local circulation.


Related Articles

  • Monsoons...  // Monkeyshines on Health & Science;Sep97 Meteorology, p23 

    Discusses information about monsoons. Formation of opposing winds due to the difference in heating between land masses; Effect of the proximity of latitudes; Difference of the monsoons during winter and summer.

  • Skill of Medium-Range Forecasts over the Indian Monsoon Region Using Different Parameterizations of Deep Convection. Das, Someshwar; Mitra, A. K.; Iyengar, G. R.; Singh, J. // Weather & Forecasting;Dec2002, Vol. 17 Issue 6, p1194 

    The operational global spectral model of the National Center for Medium Range Weather Forecasting (NCMRWF) at T80 resolution and 18 vertical levels has been used to study the skill of medium-range forecasts using three different parameterizations of deep convection namely, a Kuo-Anthes-type...

  • Climate model under fire as rains fail India. Jayaraman, K.S. // Nature;8/15/2002, Vol. 418 Issue 6899, p713 

    Reports on the criticism in Indian government for its reliance on a statistical model to forecast the monsoon. Basis of India Meteorological Department's statistical model; Advantage of switching to more sophisticated general circulation models; Government's effort to refine the statistical model.

  • Short-Range Ensemble Forecasts of Precipitation during the Southwest Monsoon. Bright, David R.; Mullen, Steven L. // Weather & Forecasting;Sep2002, Vol. 17 Issue 5, p1080 

    The skill and potential value of fifth-generation Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model (MM5) ensembles are evaluated for short-range (24 h) probabilistic quantitative precipitation forecasts over Arizona during the Southwest monsoon. The...

  • Monsoon delayed in sugarcane, cotton areas.  // Man-Made Textiles in India;Jul2009, Vol. 52 Issue 7, p256 

    A weather forecast is presented for India in July 2009, particularly citing the delay of the progress of the country's monsoon in the main cotton and sugar cane growing regions.

  • Multiscale Diagnosis of the North American Monsoon System Using a Variable-Resolution GCM. Berbery, Ernesto Hugo; Fox-Rabinovitz, Michael S. // Journal of Climate;Jun2003, Vol. 16 Issue 12, p1929 

    The onset and evolution of the North American monsoon system during the summer of 1993 were examined from regional to large scales using the National Aeronautics and Space Administration (NASA) Goddard Earth Observing System (GEOS) stretched-grid GCM. The model's grid spacing for the dynamical...

  • Monsoon: Myth & Reality. Sarkar, Ramen // Business Today;7/26/2009, Vol. 18 Issue 15, p13 

    The article presents answer to a question about the weather condition in India, particularly the normal monsoon schedule.

  • Rains to arrive next week. BASU, RITH // Telegraph (Calcutta, India);6/13/2015, p26 

    The article reports that according to weather experts, monsoon is set to arrive in Calcutta in mid of June 2015.

  • EARLY DELHI MONSOON SPARKS WEATHER FEARS.  // Sustain' Magazine;2008 Special 50th Jubilee Issue, Vol. 9 Issue 4, p10 

    The article reports on the arrival of Indian monsoons in Delhi, India, two weeks earlier than the anticipated date of July 29, 2008. It states that the onset of these monsoons two weeks early has prompted concerns that unpredictable weather patterns could cause havoc in vulnerable countries....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics