Using normalized climatological anomalies to rank extreme synoptic-scale events objectively.

Top-10 events by variable

Robert Hart and Richard Grumm

Updated 5 January 2004 to include events from 1948 through 2003.

[ Description | Top-20 All Time | Top-10 by variable | Top-10 by month | Case References | Recent Ranking Changes | Latest MRF Rarity Forecast ]


Top-10 Normalized Departures from Climatology by Height Anomaly since 1948

Rank
Date
MHEIGHT
Description
References
1
12Z17MAR1983
6.847
Low-latitude intense cyclone
Dickinson et al 1997
2
00Z09JAN1956
6.120
"The Great Atlantic Low"
Ludlum 1956
3
12Z19JAN1977
5.697
Historic Florida Freeze
Schwartz 1977
4
12Z11DEC1967
5.419
Deep Gulf of Mexico Storm
5
00Z28MAY1973
5.403
6
00Z21NOV1952
5.357
7
12Z23JUN1972
5.286
Extratropical Agnes
DiMego & Bosart 1982a,b;Bosart & Dean 1991
8
00Z03FEB1998
5.252
9
12Z13MAR1993
5.195
Superstorm of 1993
Kocin et al 1995; Dickinson et al 1997
10
12Z08JAN1958
5.193

Top-10 Normalized Departures from Climatology by Temperature Anomaly since 1948
Rank
Date
MTEMP
Description
References
1
00Z20OCT1989
5.354
SE U.S. Record Cold & Snow
2
12Z19JAN1977
5.019
Historic Florida Freeze
Schwartz 1977
3
12Z26NOV1953
4.959
4
12Z07MAY1992
4.879
5
12Z02NOV1966
4.834
Heavy C. Appal. Snowstorm
6
00Z02DEC1999
4.829
7
00Z10SEP1998
4.816
8
12Z18SEP1981
4.715
9
12Z04AUG1956
4.683
10
12Z28APR1992
4.619

Top-10 Normalized Departures from Climatology by Wind Anomaly since 1948
Rank
Date
MWIND
Description
References
1
12Z28APR1997
5.515
Strong late-season Gulf storm
2
00Z14MAR1993
5.073
Superstorm of 1993
Kocin et al 1995; Dickinson et al 1997
3
12Z17NOV2002
5.013
Historic S/Central New England Ice storm
4
00Z26NOV1950
5.012
Historic E US storm
Bristor 1951
5
12Z09JAN1956
4.882
"The Great Atlantic Low"
Ludlum 1956
6
00Z14OCT2001
4.824
Gulf Coast Severe Outbreak
7
00Z27JUN1974
4.758
Transitioned subtrop. storm
8
12Z28DEC1980
4.741
Deep Carolina Coastal Low
9
12Z16JUN1989
4.714
Widespread SE/Mid Atl Sev Outbrk
10
00Z12MAR1996
4.675

Top-10 Normalized Departures from Climatology by Moisture Anomaly since 1948
Rank
Date
MMOIST
Description
References
1
12Z15JAN1995
7.733
Deep Gulf of Mexico Storm
2
12Z22JAN1959
7.359
Severe E. U.S. Snow/Ice Storm
Treidl 1959
3
12Z08JAN1998
7.104
NE US/SE Canada Ice Storm
Gyakum and Sisson 1999; DeGaetano 2000
4
00Z20JAN1996
6.947
NE US Flooding/Snowmelt
Leathers et al 1998
5
12Z11JAN1975
6.767
Severe Minnesota Blizzard
6
12Z04JAN1950
6.654
7
00Z10JAN1978
6.536
Deep NE U.S. Storm
8
12Z26JAN1950
6.461
9
00Z24JAN1999
6.453
10
00Z05JAN1997
6.284


Last updated: 5 January 2004

Robert Hart, PSU (hart@ems.psu.edu)
Richard Grumm, SOO, NWS CTP (rgrumm@supercel.met.psu.edu)