| Date of Events |
Surface Features |
500-mb Pattern |
Classification |
March 5-6, 1963
(Nighttime event) |
Strong cold front (N-S) with warm front (W-E) intersecting over southern Appalachians |
Strong southwest flow (90 knots) ahead of deep trough over the middle MS valley |
Synoptic |
March 11-12, 1963
(Nighttime event) |
Warm front (W-E) over TN valley w/ approaching low pressure and associated cold front (N-S) |
Strong southwest flow (70 knots) ahead of trough over Plains states |
Synoptic |
June 1, 1964
(Nighttime event) |
Quasi-stationary front (W-E) located over southern AL and southern GA |
Southwest flow (35 knots) ahead of trough over the lower MS valley |
Frontal |
October 4, 1964
(Daytime event) |
Slow moving cold front (SW-NE) over OH valley w/ strong tropical low pressure ('Milda') over the lower MS valley |
Southwest flow (30 knots) ahead of deepening trough over the middle MS valley |
Synoptic |
October 16, 1964
(Nighttime event) |
Strong tropical low pressure slowly moving along the Carolina coast |
Southwest flow (40 knots) to the northeast of a closed low over the Deep South |
Tropical
('Isbell') |
September 13, 1966
(Daytime event) |
Quasi-stationary front (SW-NE) located over southern GA and southern SC |
Weak southwest flow (15 knots) ahead of a short wave trough over the southern Appalachians |
Frontal |
June 7, 1968
(Daytime event) |
Quasi-stationary tropical low pressure along the GA/SC border |
Weak east flow (20 knots) north of closed low over eastern GA |
Tropical
('Abby') |
June 16-17, 1969
(Nighttime event) |
Quasi-stationary front (SW-NE) located over southern GA and the SC coast |
Weak west flow (20 knots) |
Frontal |
July 27, 1969
(Daytime event) |
Outflow boundaries located over southern Appalachians |
Weak southwest flow (20 knots) w/ closed low over Great Lakes region |
Meso-high |
August 4, 1969
(Nighttime event) |
Weak stationary front (SW-NE) over southern Appalachians |
Southwest flow (30 knots) within trough located over TN valley |
Frontal |
May 27-28, 1973
(Nighttime event) |
Quasi-stationary front (N-S) over southern Appalachians w/ prefrontal squall line approaching from west |
Strong southwest flow (60 knots) ahead of closed low over the middle MS valley |
Synoptic |
August 13, 1973
(Daytime event) |
Outflow boundaries over southern Appalachians w/ stationary front (W-E) over OH valley |
West to southwest flow (25 knots) within a short wave trough over the southern Appalachians |
Meso-high |
September 13-14, 1973
(Daytime/Nighttime event) |
Quasi-stationary front (W-E) over TN valley w/ weak tropical low pressure over lower MS valley |
Weak southwest flow (20 knots) ahead of trough over the central Plains |
Frontal |
May 22-23, 1974
(Nighttime event) |
Frontogenesis (SW-NE) over the Carolinas w/ weakening cold front (SW-NE) over OH valley |
West to southwest flow (30 knots) within a short wave trough over TN valley |
Frontal |
October 17, 1975
(Daytime event) |
Strong low pressure centered over southern Appalachians w/ cold front (N-S) over the Deep South and warm front (W-E) over NC |
Strong southwest flow (50 knots) ahead of trough over the middle MS valley |
Synoptic |
May 28-29, 1976
(Nighttime event) |
Strong, slow moving low pressure over west TN w/ occluded front (NW-SE) extending across southern Appalachians |
Closed low over TN valley w/ south flow (35 knots) |
Synoptic |
July 27, 1976
(Daytime event) |
Outflow boundaries located over southern Appalachians w/ prefrontal trough (W-E) over the OH valley |
Weak southwest flow (15 knots) ahead of short wave trough over TN valley |
Meso-high |
July 29, 1976
(Daytime event) |
Outflow boundaries located over the southern Appalachians |
Weak west flow (20 knots) |
Meso-high |
September 7, 1977
(Daytime event) |
Weakening tropical low pressure over AL approaching stationary front (W-E) over southern Appalachians |
Southwest flow (25 knots) embedded in weak trough |
Tropical
('Babe') |
October 25-26, 1977
(Nighttime event) |
Low pressure system moving northeast across the TN valley with occluded front (NW-SE) extending across the southern Appalachians |
Southwest flow (30 knots) ahead of closed low located over OH valley |
Synoptic |
November 5-6, 1977
(Nighttime event) |
Weakening tropical low pressure over GA w/ trough located over southern Appalachians |
Closed low over AL w/ southeast flow (40 knots) |
Tropical
(Unnamed) |
July 20, 1979
(Daytime event) |
Quasi-stationary front (W-E) over TN valley and southern Appalachians |
Weak southwest flow (20 knots) ahead of trough over middle MS valley |
Frontal |
September 29, 1979
(Daytime event) |
Outflow boundaries over the southern Appalachians |
Weak southwest flow (20 knots) ahead of trough over the Deep South |
Meso-high |
March 20, 1980
(Daytime event) |
Warm front (W-E) moving north w/ approaching low pressure and associated cold front (N-S) over Mid-Atlantic states |
Deepening trough over Plains w/ southwest flow (40 knots) and weak ridge |
Synoptic |
June 25, 1980
(Nighttime event) |
Quasi-stationary front (W-E) located over central GA and central SC |
Closed low located over southern Appalachians w/ weak west flow (10 knots) |
Frontal |
July 29, 1982
(Daytime event) |
Quasi-stationary front (W-E) located over northern GA and upstate SC |
Weak west flow (10 knots) |
Frontal |
June 1, 1987
(Daytime event) |
Outflow boundaries over the southern Appalachians |
Weak short wave trough over middle MS valley w/ southwest flow (25 knots) and ridge over Mid-Atlantic states |
Meso-high |
June 19-20, 1987
(Nighttime event) |
Outflow boundaries over the southern Appalachians |
Weak southwest flow (15 knots) |
Meso-high |
August 21-22, 1990
(Daytime event) |
Outflow boundary (W-E) located near quasi-stationary front (N-S) over southern Appalachians |
Weak trough w/ weak west flow (15 knots) |
Meso-high |
March 27, 1994
(Nighttime event) |
Surface trough (W-E) located over the southern Appalachians ahead of approaching strong cold front (SW-NE) over TN valley |
Strong southwest flow (75 knots) ahead of deep trough over Plains |
Synoptic |
June 26, 1994
(Nighttime event) |
Prefrontal trough (SW-NE) over TN and OH valleys ahead of approaching cold front (N-S) |
Deepening trough over TN valley w/ strong southwest flow (50 knots) |
Synoptic |
October 4-5, 1995
(Nighttime event) |
Strong tropical low pressure approaching stationary front (SW-NE) over TN valley |
Closed low over AL w/ strong south flow (50 knots) |
Tropical
('Opal') |
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