Record Breaking "Tornado Drought"

"Through March 20, only four tornadoes have been confirmed across the nation. According to The Weather Channel's severe weather expert Dr. Greg Forbes only two other Marches have featured fewer tornadoes through the first 20 days of March, dating to 1950:

• 1969: 0 tornadoes
• 1951: 3 tornadoes

However, the lowest March U.S. tornado count on record dating to 1950 was six tornadoes in March 1951, according to Forbes. If the rest of the month features at most one additional tornado, we would set a record low for the month."

March 2013 had a major decline in tornadoes as well. It is usually every now and then that a year experiences a dramatic increase in tornadoes for March, but even less common to happen two years in a row.

"Essentially the same pattern responsible for a persistently cold and snowy winter in parts of the U.S. has also, for the most part, squashed the threat of severe weather so far.
A pronounced southward dip in the polar jet stream has frequently driven cold air into the Gulf of Mexico, as a powerful northward diversion of the jet stream has persisted in the eastern Pacific Ocean and western U.S. This is the polar opposite of a pattern which would favor severe weather in the southern states during winter.
As a result, deeper, richer Gulf moisture can't flow northward into the southern U.S. ahead of a strong jet-stream level disturbance. Shallow, meager moisture, with weak instability lends itself to damaging straight-line winds in any severe thunderstorms that have developed, rather than tornadic supercells."

http://www.weather.com/news/tornado-central/march-tornadoes-may-set-record-low-20140321