Category: Extremes affecting United States

Heat wave occuring from May 12 2021 to May 31 2021 at 63.0°N 192.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 20 days

Time span: May 12 2021 to May 31 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 3.0 °C
  • Mean temperature: 6.2 °C
  • Maximum temperature anomaly: 10.5 °C
  • Maximum temperature: 18.6 °C

Event center: 63.0°N 192.5°E

Area affected: 1056760 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2021-May-12_to_2021-May-31_192.5_63.0

Cold spell occuring from May 12 2021 to May 16 2021 at 33.0°N 279.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 5 days

Time span: May 12 2021 to May 16 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.8 °C
  • Mean temperature: 17.5 °C
  • Minimum temperature anomaly: -9.1 °C
  • Minimum temperature: 11.7 °C

Event center: 33.0°N 279.0°E

Area affected: 421230 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-May-12_to_2021-May-16_279.0_33.0

Cold spell occuring from May 11 2021 to May 27 2021 at 31.0°N 237.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 17 days

Time span: May 11 2021 to May 27 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.8 °C
  • Mean temperature: 13.6 °C
  • Minimum temperature anomaly: -5.1 °C
  • Minimum temperature: 9.7 °C

Event center: 31.0°N 237.5°E

Area affected: 990519 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-May-11_to_2021-May-27_237.5_31.0

Heat wave occuring from May 10 2021 to May 26 2021 at 51.0°N 301.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 17 days

Time span: May 10 2021 to May 26 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 7.7 °C
  • Mean temperature: 19.3 °C
  • Maximum temperature anomaly: 14.5 °C
  • Maximum temperature: 27.3 °C

Event center: 51.0°N 301.5°E

Area affected: 2335661 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2021-May-10_to_2021-May-26_301.5_51.0

Cold spell occuring from May 09 2021 to May 14 2021 at 33.0°N 266.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 6 days

Time span: May 09 2021 to May 14 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.9 °C
  • Mean temperature: 12.7 °C
  • Minimum temperature anomaly: -12.1 °C
  • Minimum temperature: -3.7 °C

Event center: 33.0°N 266.0°E

Area affected: 947668 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-May-09_to_2021-May-14_266.0_33.0

Cold spell occuring from May 09 2021 to May 28 2021 at 64.0°N 285.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 20 days

Time span: May 09 2021 to May 28 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -5.7 °C
  • Mean temperature: -10.1 °C
  • Minimum temperature anomaly: -14.5 °C
  • Minimum temperature: -30.1 °C

Event center: 64.0°N 285.0°E

Area affected: 5785885 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-May-09_to_2021-May-28_285.0_64.0

Cold spell occuring from May 05 2021 to May 12 2021 at 40.5°N 273.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 8 days

Time span: May 05 2021 to May 12 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.8 °C
  • Mean temperature: 8.2 °C
  • Minimum temperature anomaly: -10.2 °C
  • Minimum temperature: 2.9 °C

Event center: 40.5°N 273.5°E

Area affected: 599299 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-May-05_to_2021-May-12_273.5_40.5

Heat wave occuring from April 30 2021 to May 02 2021 at 42.5°N 258.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 3 days

Time span: April 30 2021 to May 02 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 9.3 °C
  • Mean temperature: 19.5 °C
  • Maximum temperature anomaly: 14.2 °C
  • Maximum temperature: 23.6 °C

Event center: 42.5°N 258.5°E

Area affected: 164787 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2021-Apr-30_to_2021-May-02_258.5_42.5

Heat wave occuring from April 29 2021 to May 01 2021 at 46.5°N 242.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 3 days

Time span: April 29 2021 to May 01 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 6.4 °C
  • Mean temperature: 12.8 °C
  • Maximum temperature anomaly: 10.2 °C
  • Maximum temperature: 23.3 °C

Event center: 46.5°N 242.0°E

Area affected: 118730 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2021-Apr-29_to_2021-May-01_242.0_46.5

Cold spell occuring from April 28 2021 to May 01 2021 at 29.0°N 252.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Mexico
  • United States

Duration: 4 days

Time span: April 28 2021 to May 01 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.0 °C
  • Mean temperature: 13.8 °C
  • Minimum temperature anomaly: -9.4 °C
  • Minimum temperature: 6.6 °C

Event center: 29.0°N 252.0°E

Area affected: 237731 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2021-Apr-28_to_2021-May-01_252.0_29.0