Weather

Heading toward severe weather season

Can not rule out future cold snaps this early in the year

Sirens for outside only

There are some model stratosphere rumblings for a return to colder after the big warm-up but because of the distance off I consider it just data noise for now.

While we get severe weather at times in the late autumn and winter the prime season here and in most of the country is Spring.

The Pacific is still in a -PDO phase which favors increased severe weather in the Spring and early Summer in parts of the U.S.

We are still in a La Nina in the Pacific although the atmosphere has not behaved much like a typical one most of the winter.

La Nina seasons often see an increase in severe weather above-normal especially just to the North and West of Atlanta with the max influence in frequency in the ArkLaTx region straddling the Mississippi River. Top panel is tornadoes and bottom panel is hailstorms March-April-May:

Tornado and hail frequency in La Nina seasons Tornado frequency top hail frequency bottom panel. Orange decrease, purple increase

Current projections indicate the La Nina will continue but weaken slowly some in the months ahead:

IRI multi model La Nina projection MAM temps/precip outlook

Models are showing changes in the MJO Madden Julian Oscillation and monitoring of the GWO Global Wind Oscillation and GLAAM Global Angular Atmospheric Momentum suggest a coming uptick in severe weather risk starting primarily as usual to our West in traditional Spring Tornado season areas mainly South:

European model ensemble forecast GAAM

Using GEFS and CFS model derived analogs:

Supercell storm parameter Feb 21-28
Supercell storm parameter Feb 27-March 6 SPC data charts from NIU
Top analog results March 1-March 14
CFS model severe risk 10 day average
CFSv2 model severe weather parameter accumulated

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