Temos um grupo de portugueses no terreno!
Neste momento estão a transmitir em directo a partir do norte de Dallas:
Imagens em directo:
http://www.troposfera.pt/index.php/no-caminho-dos-tornados/acompanhamento-em-directo
Não me parece.Essa estrutura que eles estão a filmar não é uma shelf cloud?
Thus far we've seen about 150 preliminary tornado reports for May, compared to an average for the entire month of 173 during the last three years (2012 - 2014). After Sunday's tornadoes, our preliminary total for the year is now around 400, just below the "inflation-adjusted" average for this point in the year. The average year-to-date total in that database climbs to around 600 by May 31. It would take a very busy last half of May to reach that point, but given the model indications for this coming weekend, and the longer-range suggestions of continued upper-level troughiness in the West, I wouldn't rule it out.
This is mostly due to an incredibly and record-breakingly slow first three months of the year. A total of just 41 tornadoes touched down in January, February and March, far below the typical 150+ tornado count more typical for the first quarter of the year. Through Monday, however, April had 173 tornadoes (according to the Storm Prediction Center), slightly above three-year averages for the same timespan.