Category: Extremes affecting United States

Heat wave occuring from August 22 2021 to August 26 2021 at 32.0°N 265.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 5 days

Time span: August 22 2021 to August 26 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 3.2 °C
  • Mean temperature: 31.7 °C
  • Maximum temperature anomaly: 4.5 °C
  • Maximum temperature: 33.6 °C

Event center: 32.0°N 265.0°E

Area affected: 63250 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-Aug-22_to_2021-Aug-26_265.0_32.0

Heat wave occuring from August 22 2021 to August 29 2021 at 39.5°N 262.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 8 days

Time span: August 22 2021 to August 29 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 4.4 °C
  • Mean temperature: 28.5 °C
  • Maximum temperature anomaly: 6.7 °C
  • Maximum temperature: 32.0 °C

Event center: 39.5°N 262.0°E

Area affected: 587123 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-Aug-22_to_2021-Aug-29_262.0_39.5

Cold spell occuring from August 20 2021 to September 11 2021 at 39.0°N 234.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 23 days

Time span: August 20 2021 to September 11 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.6 °C
  • Mean temperature: 17.1 °C
  • Minimum temperature anomaly: -4.2 °C
  • Minimum temperature: 11.0 °C

Event center: 39.0°N 234.5°E

Area affected: 939901 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-Aug-20_to_2021-Sep-11_234.5_39.0

Heat wave occuring from August 18 2021 to August 25 2021 at 29.5°N 268.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 8 days

Time span: August 18 2021 to August 25 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 2.2 °C
  • Mean temperature: 29.6 °C
  • Maximum temperature anomaly: 3.2 °C
  • Maximum temperature: 31.3 °C

Event center: 29.5°N 268.5°E

Area affected: 79851 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-Aug-18_to_2021-Aug-25_268.5_29.5

Heat wave occuring from August 17 2021 to August 25 2021 at 27.5°N 263.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 9 days

Time span: August 17 2021 to August 25 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 29.5 °C
  • Maximum temperature anomaly: 1.8 °C
  • Maximum temperature: 30.4 °C

Event center: 27.5°N 263.0°E

Area affected: 226040 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-Aug-17_to_2021-Aug-25_263.0_27.5

Cold spell occuring from August 17 2021 to August 24 2021 at 39.5°N 247.5°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: August 17 2021 to August 24 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.5 °C
  • Mean temperature: 13.6 °C
  • Minimum temperature anomaly: -12.9 °C
  • Minimum temperature: 3.6 °C

Event center: 39.5°N 247.5°E

Area affected: 1271579 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-Aug-17_to_2021-Aug-24_247.5_39.5

Cold spell occuring from August 11 2021 to August 17 2021 at 31.5°N 254.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 7 days

Time span: August 11 2021 to August 17 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.4 °C
  • Mean temperature: 21.9 °C
  • Minimum temperature anomaly: -6.9 °C
  • Minimum temperature: 17.0 °C

Event center: 31.5°N 254.0°E

Area affected: 204496 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-Aug-11_to_2021-Aug-17_254.0_31.5

Heat wave occuring from August 10 2021 to August 12 2021 at 36.0°N 268.5°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: August 10 2021 to August 12 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 4.3 °C
  • Mean temperature: 30.1 °C
  • Maximum temperature anomaly: 5.3 °C
  • Maximum temperature: 31.7 °C

Event center: 36.0°N 268.5°E

Area affected: 89379 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-Aug-10_to_2021-Aug-12_268.5_36.0

Cold spell occuring from August 09 2021 to August 21 2021 at 33.5°N 248.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 13 days

Time span: August 09 2021 to August 21 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.2 °C
  • Mean temperature: 27.3 °C
  • Minimum temperature anomaly: -6.0 °C
  • Minimum temperature: 18.5 °C

Event center: 33.5°N 248.0°E

Area affected: 67250 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-Aug-09_to_2021-Aug-21_248.0_33.5

Heat wave occuring from August 08 2021 to August 13 2021 at 41.5°N 275.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 6 days

Time span: August 08 2021 to August 13 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 4.4 °C
  • Mean temperature: 25.8 °C
  • Maximum temperature anomaly: 5.6 °C
  • Maximum temperature: 28.1 °C

Event center: 41.5°N 275.5°E

Area affected: 88833 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-Aug-08_to_2021-Aug-13_275.5_41.5