Climatological Figures


Decadal 850 hPa Temperature Changes (2000-2009 minus 1970-1979)

Northern Hemisphere: DJF JJA
Southern Hemisphere: DJF JJA
Tropics: DJF JJA

1000-500 hPa Thickness Maps

January/February 1970-1979 2000-2009 (2000-2009) minus (1970-1979)
July/August 1970-1979 2000-2009 (2000-2009) minus (1970-1979)

Northern Hemisphere Mean Flow Patterns (1950-2009, except SON through 2008)

500 hPa Heights DJF 500 hPa Heights MAM 500 hPa Heights JJA 500 hPa Heights SON
SLP DJF SLP MAM SLP JJA SLP SON
850 hPa Temperature DJF 850 hPa Temperature MAM 850 hPa Temperature JJA 850 hPa Temperature SON
300 hPa Vector Winds DJF 300 hPa Vector Winds MAM 300 hPa Vector Winds JJA 300 hPa Vector Winds SON

Southern Hemisphere Mean Flow Patterns (1950-2009, except SON through 2008)

500 hPa Heights DJF 500 hPa Heights MAM 500 hPa Heights JJA 500 hPa Heights SON
SLP DJF SLP MAM SLP JJA SLP SON
850 hPa Temperature DJF 850 hPa Temperature MAM 850 hPa Temperature JJA 850 hPa Temperature SON
300 hPa Vector Winds DJF 300 hPa Vector Winds MAM 300 hPa Vector Winds JJA 300 hPa Vector Winds SON

Tropics Mean Flow Patterns (1950-2009, except SON through 2008), Note: OLR begins 1979

500 hPa Heights DJF 500 hPa Heights MAM 500 hPa Heights JJA 500 hPa Heights SON
SLP DJF SLP MAM SLP JJA SLP SON
850 hPa Temperature DJF 850 hPa Temperature MAM 850 hPa Temperature JJA 850 hPa Temperature SON
300 hPa Vector Winds DJF 300 hPa Vector Winds MAM 300 hPa Vector Winds JJA 300 hPa Vector Winds SON
OLR DJF OLR MAM OLR JJA OLR SON
SST DJF SST MAM SST JJA SST SON

Atallah-Aiyyer NH/SH 1000-500 hPa thickness climatology


Global Climatology of 850 and 200 hPa Closed Anticyclones

The following global climatology of closed anticyclones is taken from Galarneau et al. (2008). Closed anticyclones were defined by closed 162 dam and 1236 dam contours at 850 and 200 hPa, respectively. These closed contour values were chosen so as to maximize the likelihood of identifying closed anticyclones in subtropical and lower middle latitudes equatorward of the principal jet streams in both hemispheres.

NH annual 850 hPa closed anticyclones NH annual 200 hPa closed anticyclones
NH DJF 850 hPa closed anticyclones NH DJF 200 hPa closed anticyclones
NH JJA 850 hPa closed anticylones NH JJA 200 hPa closed anticyclones
SH annual 850 hPa closed anticyclones SH annual 200 hPa closed anticyclones
SH DJF 850 hPa closed anticyclones SH DJF 200 hPa closed anticyclones
SH JJA 850 hPa closed anticyclones SH JJA 200 hPa closed anticyclones

Strong El Nino (JFM 1983 & 1998) and Strong La Nina (JFM 1989 & 1999) Comparison

Mean SST ('83 + '98) Mean SST ('89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean 1000-500 hPa thickness ('83 + '98) Mean 1000-500 hPa thickness ('89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean OLR ('83 + '98) Mean OLR ('89 + '99) Difference ('83 + '98) - ('89 + '99)
Anomalous OLR ('83 + '98) Anomalous OLR ('89 + '99) Difference ('83 + '98) - ('89 + '99)
   
Mean Streamfunction (~850 hPa; '83 + '98) Mean Streamfunction (~850 hPa; '89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean Streamfunction (~200 hPa; '83 + '98) Mean Streamfunction (~200 hPa; '89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean Velocity Potential (~850 hPa; '83 + '98) Mean Velocity Potential (~850 hPa; '89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean Velocity Potential (~200 hPa; '83 + '98) Mean Velocity Potential (~200 hPa; '89 + '99) Difference ('83 + '98) - ('89 + '99)
   
Mean SLP ('83 + '98) Mean SLP ('89 + '99) Difference ('83 + '98) - ('89 + '99)
Mean 250 hPa winds ('83 + '98) Mean 250 hPa winds ('89 + '99) Difference ('83 + '98) - ('89 + '99)

Atlantic Multidecadal Oscillation (AMO)

Mean SSTs 1965-1985  JAS Anomaly SSTs 1965-1985 JAS
Mean SSTs 1995-2005  JAS Anomaly SSTs 1995-2005 JAS

Precipitable Water Figures

PW DJF PW JJA
PW (1959-1968)
PW (1999-2008)
PW (1999-2008 minus 1959-1968)

Global Rainfall Maps from the Sustainable Development Department (SD) of the UN (1961-1990)

Drought (1988) vs. Wet Year (1993) Over the High Plains

1988 JJA mean PW 1993 JJA mean PW
1888 JJA PW anomaly 1993 JJA PW anomaly
1988 JJA 850 hPa mean heights 1993 JJA 850 hPa mean heights
1988 JJA 850 hPa height anomaly 1993JJA 850 hPa height anomaly
1988 JJA 850 hPa mean winds 1993 JJA 850 hPa mean winds
1988 JJA 850 hPa wind anomaly 1993 JJA 850 hPa wind anomaly
1988 JJA 200 hPa mean heights 1993 JJA 200 hPa mean heights
1988 JJA 200 hPa height anomaly 1993 JJA 200 hPa height anomaly

Drought (1976) vs. Wet Year (2007) Over the United Kingdom

Asiatic Summer (JJA) Monsoon (1950-2009)

Record Heat in AZ/NM/OK 27-29 June 1994

Midwest Record Heat 14-15 July 1954

Midwest Record Cold 1-5 February 1996

Record Alaskan Cold 16-29 December 1961

Record Western US Cold January 1949

Record Central/Eastern US Cold January 1977

Superstorm 13-14 March 1993

La Reunion World Record Rains

Super Outbreak 3 April 1974

CA Fires of 22-23 October 2007

Mean SLP
20 October 21 October 22 October 23 October 24 October
850 hPa temperature
22 October 23 October
850 hPa temperature anomaly
22 October 23 October
850 hPa vector wind
22 October
850 hPa vector wind anomaly
22 October

Autumn (SON) 2009


Page last updated: 3 December 2009