The March 13-14, 1993 Southeastern Winter Storm (widely known as the Storm of the Century, Superstorm of 1993, or Blizzard of '93) was one of the most intense and widespread winter storms in U.S. history, delivering heavy snowfall, blizzard conditions, hurricane-force winds, and tornadoes from the Gulf Coast to the Northeast. In the Southeast U.S., it struck primarily on March 13 (with effects continuing into March 14), blanketing Alabama, Georgia, the Carolinas, and beyond in rare deep snow—often the heaviest or only significant snowfall in living memory for many areas. The storm set all-time snowfall records in cities like Birmingham (13 inches), Chattanooga (20 inches), and Asheville (18.2 inches), isolated thousands (especially in mountains), and caused massive disruptions amid extreme cold. It's remembered as a "once-in-a-generation" event for the Deep South, with impacts far exceeding typical Southeastern storms.
A powerful upper-level trough dug into the eastern U.S., supported by three jet streaks and explosive cyclogenesis. A surface low formed near the Gulf of Mexico on March 12, rapidly intensified (dropping to 975-971 mb), and tracked northeastward across Florida/Georgia into the Carolinas by March 13-14. Deep Arctic air from a prior outbreak entrenched across the Southeast, with Gulf moisture overrunning in a classic overrunning pattern amplified by the low's track and strong lift. This produced heavy snow (high ratios in dry cold air) rather than rain, with blizzard conditions from strong pressure gradient winds. A squall line ahead of the cold front spawned tornadoes in Florida. The storm's forecast accuracy (predicted 5 days ahead) was groundbreaking, but its intensity surprised many in the unprepared South.
Heavy snow, blizzard winds (gusts 40-90+ mph), and cold paralyzed the unprepared Southeast:
Snow began March 13 in the Southeast (some late March 12 in west), peaking March 13-14, with heaviest in a broad swath from Alabama through Georgia to the Carolinas/Appalachians:
Many totals remain all-time records for March or overall in affected cities, with rapid tapering south/coastward.
The storm arrived with deep Arctic air; temperatures during snowfall were in the teens-20s°F, with highs below freezing. Post-storm, unseasonably cold air followed (e.g., Birmingham low of 2°F on March 14). No widespread all-time March lows on exact dates, but the cold preserved snow and amplified impacts (e.g., prolonged freezing).
Interstates/highways closed from Atlanta northeastward; stranded motorists widespread (thousands isolated in mountains); airports shut/delays; schools/businesses/government closed; National Guard rescues (200+ hikers in TN/NC mountains).
Massive power outages (millions affected regionally; weeks in some areas); downed lines/trees from snow/wind.
At least 15 deaths in Georgia (hundreds nationwide total ~318); accidents, exposure, heart attacks from shoveling.
$5-6 billion+ damage (1993 dollars); agriculture/poultry losses; commerce halted.
States of emergency/curfews; overwhelmed services; iconic stranded scenes.
The true devastation (power outages for millions, tree/power line destruction, military aid) was in Canada/northern U.S. (e.g., Quebec's costliest disaster, Maine's deadliest natural event with 8 deaths)
This was an epic, generational storm for the Southeast.
The March 12–14, 1993 Superstorm (Storm of the Century / Blizzard of ’93) was a Gulf-originating bomb cyclone that phased a southern-stream shortwave with a northern-stream Arctic trough, then ran the classic East Coast snowstorm track while still having enough cold air in place for snow as far south as the Florida Panhandle. What made it historic was not one ingredient, but how many of them lined up at once.
By early March the Northern Hemisphere pattern had amplified. A strong ridge sat over the West Coast, producing split flow: a polar jet in the northern stream and a vigorous southern/subtropical jet across northern Mexico and the Gulf. A massive Atlantic block helped lock the eastern North American trough in place. That pattern is a classic precursor to a major East Coast winter storm: cold air can be stored over the interior while a southern-stream wave taps Gulf and Caribbean moisture.
An Arctic high built over the Plains and Midwest. By March 11–12 that cold pool was already driving 850-mb temperatures below freezing well into the Gulf states. Confluence aloft over the Northeast helped pin the cold air and high pressure in place so precipitation along the coast would stay snow rather than flip to rain. That is the same “cold air damming / high to the north” geometry seen in many classic nor’easters, except this cyclone started much farther south.
The storm’s character changed when the northern-stream PV anomaly merged with the southern-stream trough. That merger produced a highly amplified, negatively tilted 500-mb trough over the Southeast. Height falls of several hundred meters in 12 hours were analyzed over southern Georgia. Upper-level divergence in the left-exit / right-entrance region of the stacked jet streaks sat over the surface low, so the column could empty faster than mass could be replaced. That is textbook bombogenesis.
Rough pressure history (analyses vary slightly by source):
A 24-hour fall on the order of 20–26 mb during the Gulf-to-Georgia leg is well into “bomb” territory, and it happened at an unusually low latitude.
Moisture was not just Gulf air. Lagrangian source studies later attributed a large share of the storm’s precipitable water to the western North Atlantic and Caribbean as well as the Gulf. The warm conveyor belt ran north-northeast of the low; the cold conveyor and dry slot wrapped in behind. A powerful low-level jet over the eastern Gulf and Cuba helped feed the cold front that trailed all the way to the Isthmus of Tehuantepec.
Track in short:
When the center crossed northwest Florida, a Gulf storm surge of several to ~9–12 feet hit parts of the Big Bend. Ahead of the cold front, a long squall line / serial derecho swept Florida, southeast Georgia, Cuba, and adjacent waters with severe winds and tornadoes. That convective line was the warm-sector face of the same cyclone that was already dumping snow on Alabama and Georgia.
For Georgia specifically at 12Z March 13: the 500-mb trough was negatively tilted with a vorticity maximum over southern Georgia, 250-mb winds leaving the trough over northwest Florida near 140 kt, and the surface low over southeast Georgia near 976 mb with the cold front crossing Florida. Rain was changing to heavy snow west and north of the low; immediately west of the center, radar showed a second area of high reflectivity where the changeover was underway. Record or near-record March (and in some cases all-time) sea-level pressures were set from Georgia northward along the track.
Three things kept the thermal profile cold enough:
Gulf moisture then overran that cold layer. In the mountains the result was 1–3+ feet with extreme drifting. Birmingham set a storm-total record near 13 inches; Chattanooga around 20; Asheville 18.2; Mount Le Conte, TN 56 inches; Mount Mitchell, NC about 50 inches with enormous drifts. Atlanta and north Georgia were in the heavy-snow / blizzard-gradient part of the storm, not the rain side. After the low passed, northwest flow and the tight gradient between the 960-mb-class cyclone and the interior high produced damaging winds, blowing snow, and a sharp temperature crash.
A negatively tilted, phasing mid-level trough and stacked jet streaks provided extreme upper divergence over a Gulf baroclinic zone that had already been moistened and destabilized. Convection and latent heat release helped the first deepening over water. Merger of northern and southern PV anomalies then produced a deep, negatively tilted trough and a surface bomb that tracked from the northwest Gulf across the Florida Panhandle and eastern Georgia, then up the seaboard. Arctic air was already in place, so the same cyclone that generated a subtropical derecho and storm surge in Florida produced a Category-5-style RSI blizzard from Alabama through the Appalachians and Northeast.
This was the first East Coast storm of this magnitude that NWS medium-range models and HPC highlighted several days out (threat recognized around March 8; blizzard warnings ~2 days before onset). The Gulf-phase intensity was still underdone in some early runs, but the “historic East Coast storm this weekend” message was out in time for states to declare emergencies before the snow started. That is why the event is also a landmark in operational forecasting, not just synoptics.