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Latin Americas

Post #1 by GrannyGrottbags » Mon Jul 22, 2013 10:25 pm

“A wave of polar cold affected Argentina on Friday, with possibilities of being intensified during the weekend. According to the local press, there is also the possibility of an unusual snowfall in Buenos Aires.”
http://news.xinhuanet.com/english/photo ... 7748_3.htm

Several sectors of the Argentine province of Mendoza awoke today covered by snow.

By Luiz Fernando Nachtigall – 19 July 2013

The snow accumulation is significant in some locations (10 cm or more) as in San Rafael and Penitents. It snowed in the Sierra de la Ventana, in the province of Buenos Aires, where the ridges yesterday were completely white (area may have heavy snow this weekend).

The cold was extreme in the neighboring country on Friday. The lower lows occurred in Patagonia. Did -13.7 º C in Esquel, Maquinchao -11.5 º C, 10.5 º C in Bariloche, -9.7 º C in Perito Moreno and -8.5 º C in Neuquan. Already in Greater Buenos Aires, the minimum in Ezeiza International Airport was 1.0 ° C below zero.

In Uruguay, the minimum on Friday were -1.0 º C in Mercedes, 0.0 º C in Salto, 1.5 ° C in Rivera, Durazno 1.6 º C, 1.6 º C in Artigas, and 2.0 º C in Treinta y Tres , Paysandu and Paso de los Toros.

In Rio Grande do Sul, the second pulse polar air this week arrived yesterday and brought a sharp decline in temperature after a Wednesday when the temperature increased from 26 º C in the state. The Chui recorded 7 º C with gusts of 80 km / h late in the afternoon.

The MetSul reiterates warning about extreme cold in the Southern Cone and Brazil as seldom felt in recent years. The more intense cold today and tomorrow follows in the southern state. The biggest warning is for the period between Sunday and Thursday of next week because of a third pulse of icy air that we reach this weekend and will be much stronger than the first two.

The MetSul not rule out temperature in Aparados Sierra -6 ° C to -8 ° C in the first half of the week, occasionally smaller in some spots and marks around 0 º C and / or negative almost everywhere in the state, including Porto Alegre.

The impact will be a true “winter storm” ( winter storm an American expression), which will be the subject of a later comment on the specific publication colleague meteorologist Eugenio Hackbart. The whole day will be very cold and icy with very low maximum until evening.

There will be stations at the highest points in southern Brazil that should be maximum – repeat maximum - below zero. There is a high risk of frost black Minuano that the wind will blow strong intensely at the beginning of the week that may bring negative thermal sensation in the capital and up to 15º C below zero or less in Campos de Cima da Serra.

It is inadvisable to camp in the park Aparados Sierra over the next week and remain in place will require special clothing of polar nature, such as used in the Antarctic bases and the military on the summit of Church Hill. Also very high risk of hypothermia for street homeless population throughout the South of Brazil. Alert is also the risk of ice formation on the tarmac roads in the Plateau, Upper Uruguay, Serra Gaucha and Aparados, as well as in the higher parts of Santa Catarina and Paraná.

Snow forecast numerical model ETA National Weather Service of Argentina until the day 24/7

The snow, as always, remains the question of more stormy weather. The MetSul believed to be very high probability of snow in the province of Buenos Aires and Uruguay on Sunday and earlier this week with a chance of accumulation, particularly in Argentina.

In southern Brazil, the window opens for snow late on Sunday and remain until Wednesday. At this time the scenario is far from being defined as the snow in southern Brazil, but the likelihood of snow in the upper parts of Southern Brazil is very high. Our belief, moreover, is that the snow may even reach the three states of the South There are some scenarios that are not yet sufficiently clear and deserve more detailed analysis in our newsletters over the weekend.

They are: 1) the possibility of an event log with snow broader phenomenon in many areas of southern Brazil, 2) chance of snow in areas of low or medium altitude (sea level to 500 meters) of Rio Grande do Sul and Santa Catarina, 3) falling graupel or frozen rain (sleet) in many low areas or at sea level in Rio Grande do Sul and Santa Catarina, 4) snow in places somewhat accustomed to the phenomenon as Paraguay, western Parana¡, Misiones in Argentina and perhaps even the highlights of the West of Mato Grosso do Sul.

Facing a significant event

Fact is that we are facing significant event which cold air can generate phenomena in places where they are very low recurrence.

Thanks to meteorologist Joe D’Aleo fr this info
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