Category: Extremes affecting United States

Heat wave occuring from April 28 2021 to April 30 2021 at 39.5°N 285.5°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 28 2021 to April 30 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 5.6 °C
  • Mean temperature: 21.1 °C
  • Maximum temperature anomaly: 8.7 °C
  • Maximum temperature: 25.8 °C

Event center: 39.5°N 285.5°E

Area affected: 139991 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-28_to_2021-Apr-30_285.5_39.5

Heat wave occuring from April 26 2021 to April 29 2021 at 53.0°N 170.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 4 days

Time span: April 26 2021 to April 29 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 1.3 °C
  • Mean temperature: 3.8 °C
  • Maximum temperature anomaly: 1.8 °C
  • Maximum temperature: 4.3 °C

Event center: 53.0°N 170.0°E

Area affected: 104654 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-26_to_2021-Apr-29_170.0_53.0

Heat wave occuring from April 22 2021 to April 28 2021 at 60.0°N 218.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 7 days

Time span: April 22 2021 to April 28 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 2.1 °C
  • Mean temperature: 7.7 °C
  • Maximum temperature anomaly: 6.1 °C
  • Maximum temperature: 11.1 °C

Event center: 60.0°N 218.5°E

Area affected: 213914 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-22_to_2021-Apr-28_218.5_60.0

Heat wave occuring from April 21 2021 to April 28 2021 at 68.5°N 197.0°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: April 21 2021 to April 28 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 7.1 °C
  • Mean temperature: 2.3 °C
  • Maximum temperature anomaly: 11.9 °C
  • Maximum temperature: 8.0 °C

Event center: 68.5°N 197.0°E

Area affected: 241518 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-21_to_2021-Apr-28_197.0_68.5

Cold spell occuring from April 20 2021 to April 27 2021 at 32.0°N 240.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 8 days

Time span: April 20 2021 to April 27 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 13.4 °C
  • Minimum temperature anomaly: -2.9 °C
  • Minimum temperature: 10.0 °C

Event center: 32.0°N 240.0°E

Area affected: 769066 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-20_to_2021-Apr-27_240.0_32.0

Cold spell occuring from April 19 2021 to April 21 2021 at 49.0°N 271.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 3 days

Time span: April 19 2021 to April 21 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -7.0 °C
  • Mean temperature: -0.9 °C
  • Minimum temperature anomaly: -9.9 °C
  • Minimum temperature: -6.8 °C

Event center: 49.0°N 271.5°E

Area affected: 251857 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-19_to_2021-Apr-21_271.5_49.0

Cold spell occuring from April 17 2021 to April 22 2021 at 27.5°N 261.5°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 6 days

Time span: April 17 2021 to April 22 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -5.9 °C
  • Mean temperature: 18.4 °C
  • Minimum temperature anomaly: -9.7 °C
  • Minimum temperature: 9.5 °C

Event center: 27.5°N 261.5°E

Area affected: 168674 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-17_to_2021-Apr-22_261.5_27.5

Cold spell occuring from April 15 2021 to April 24 2021 at 30.5°N 260.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 10 days

Time span: April 15 2021 to April 24 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -8.1 °C
  • Mean temperature: 7.4 °C
  • Minimum temperature anomaly: -12.9 °C
  • Minimum temperature: -2.5 °C

Event center: 30.5°N 260.0°E

Area affected: 2136761 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-15_to_2021-Apr-24_260.0_30.5

Heat wave occuring from April 13 2021 to May 02 2021 at 60.5°N 207.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 20 days

Time span: April 13 2021 to May 02 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 4.2 °C
  • Mean temperature: 5.6 °C
  • Maximum temperature anomaly: 12.2 °C
  • Maximum temperature: 20.4 °C

Event center: 60.5°N 207.0°E

Area affected: 3150432 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-13_to_2021-May-02_207.0_60.5

Cold spell occuring from April 12 2021 to April 17 2021 at 32.0°N 241.0°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: April 12 2021 to April 17 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 13.1 °C
  • Minimum temperature anomaly: -2.5 °C
  • Minimum temperature: 11.5 °C

Event center: 32.0°N 241.0°E

Area affected: 186504 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-12_to_2021-Apr-17_241.0_32.0