A new TD has formed. It is #8. It will only impact the Azores with TS force winds. A low pressure system will absorb it N of the Azores.
Daily Archives: August 15, 2012
*****SEVERE WEATHER WATCH FOR EAST VIRGINIA*****
I EXPECT INSTABILITY TO KEEP RISING AS THE DAY GOES ON. THERE ARE THUNDERSTORMS CURRENTLY FORMING IN WEST VA THESE THUNDERSTORMS WILL MOVE EAST WHILE SIGNIFICANTLY STRENGTHENING. EXPECT A HELTHY LINE OF THUNDERSTORMS TO MOVE IN LATE AFTERNOON.
Forecast for Eastern US for the next year (climate)
So new climate models came out today and here is what to look for for the eastern CONUS.
Winter 2012: Average for most areas. Slightly warmer with slightly more precipitation due to a Modiki type event. This is when there are above average SSTs in the equatorial East Pacific. Then comes the ice-cold Chilean current; underwater. The warm water heats up the air causing it to rise. Thunderstorms form in an area known as the ITCZ or Inter tropical convergence zone where opposing trade winds meet. These thunder storms cause an upwelling of water therefore bringing the cold chilean-current waters up to the surface. causing pools of warm water and cool water to swirl together. So in determining the ENSO (El Nino/Southern oscillation) event of this year because it is taken from averages ( cold + warm in average terms cancels to 0 there fore not El Nino (Warmer) or La Nina (Colder) but instead a modiki year which is very rare) becomes very difficult. Instead there is a different set of rules for a Modiki year.
Photo: current SSTs in the east pacific. Notice the bright reds and swirling pockets of blues.
Forecast: SNOWY and average temps For us on the east coast.
***SPECIAL WEATHER BULLETIN***
Issued for Coastal VA and surrounding areas
Valid from 200PM EDT – 800PM EDT AUG 15 2012
Severe weather will impact this region today with high winds and large hail. Be prepared for oncoming severe storms.
Climate forecast
Winter 2012-2013:
There will be a weak El Nino and a likely negative PDO. In more simple terms, an area of moderately warm waters off the coast off Peru (El Nino) and Cooler waters off the SW coast of Alaska(Negative PDO). So what does this mean for the US? It means that the eastern seaboard will see cooler temperatures so it will be a cooler than normal winter for the eastern third of the country. Also this set of conditions favors a pattern known as the Greenland block. This is when a ridge of high pressure sits over Greenland and causes the jet stream (which is a “storm highway” and the divide between warm and cold) to dive south into the Eastern US. This ridging will vary from week to week this winter and will not be as strong as 2010-2011. The East will see Above-average precipitation (likely in the form of snow due to below average temperatures. In the Center of the country there will be the other counterpart to the Eastern trough, the high where the jet stream rises warm air and dry air into the nations heartland causing lower than average snow levels and worsening drought. In the Western US it should be a fairly average winter other than the fact that the Pacific storms will be more powerful and more frequent.
Stay tuned!
-Jack
Forecasterjack 