A Look at Global Climate April 2018: U.S. Cold & Drenching India Rains

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United States: Record cold affected the Upper Midwest in April 2018 and the entire Central and East U.S. (except Florida) was cooler than normal for mid-spring (Fig. 1). The Southwest U.S. was very warm. The precipitation regimes was very dry in the Southwest U.S. to Texas and across the Upper Midwest/Midwest States (Fig. 2). The wet zone was in the Northwest and Interior Southeast U.S.

Fig. 1-2: NOAA temperature anomaly and percent of normal precipitation analysis for the U.S. in April 2018.

Europe: While the U.S. was cold a very warm regime anchored over Europe (Fig. 3). Warmest anomalies stretched from Germany to Romania. Minimal precipitation accompanied the warm climate in April (Fig. 4). Central and Southeast Europe to Ukraine and the Black Sea region very exceptionally dry in April while parts of Western Europe were wetter than normal.

Fig. 3-4: NOAA temperature anomaly and percent of normal precipitation analysis for Europe in April 2018.

Western Russia: Warmer than normal conditions were observed fading to cooler than normal climate in Central Russia (Fig. 5). Warmest anomalies were west of the Black Sea region into Central Europe. The Black Sea Region including Ukraine to Southwest Russia was very dry (Fig. 6). Northwest to Central Russia were wetter than normal.

Fig. 5-6: NOAA temperature anomaly and percent of normal precipitation analysis for Western Russia in April 2018.

China: In April China was warmer than normal with warmest anomalies in Central China (Fig. 7). Interestingly, the warmer zones were also wetter than normal in April (Fig. 8). Southeast China was sharply drier than normal during April. Japan was also warmer than normal with both patchy wet and dry precipitation zones.

Fig. 7-8: NOAA temperature anomaly and percent of normal precipitation analysis for China in April 2018.

India: Far western India was warmer than normal in April while the remainder of the country was normally warm (Fig. 9). Excessive rainfall was observed during April across North-central and Northeast India (Fig. 10). Rainfall caused widespread flooding causing extensive damage and fatalities. Very dry conditions were observed in far west/southwest portions of India. Most of Southeast India was also dry.

Fig. 9-10: NOAA temperature anomaly and percent of normal precipitation analysis for India in April 2018.

Australia: Most of Australia was warmer than normal in April (Fig. 11). Warmest anomalies (with very dry climate) extended into Southeast Australia. Most of Australia was sharply drier than normal in April (Fig. 12).

Fig. 11-12: NOAA temperature anomaly and percent of normal precipitation analysis for Australia in April 2018.

South Africa: Warmer than normal temperatures were observed in April across South Africa (Fig. 13).  Far southern and southwestern Africa was very dry (Fig. 14). However, Interior South Africa was very wet.  Much of eastern sections were dry.

 

Fig. 13-14: NOAA temperature anomaly and percent of normal precipitation analysis for South Africa in April 2018.

South America: Argentina was very warm in April (Fig. 15). Marginally beneficial rainfall emerged in northeast/north Argentina while Brazil was extremely dry (Fig. 16).

Fig. 15-16: NOAA temperature anomaly and percent of normal precipitation analysis for South America in April 2018.

Global SSTA in April: La Nina ended while the Pacific decadal oscillation, Atlantic multi-decadal oscillation and Indian Ocean dipole were each neutral (Fig. 17).

Fig. 17: Global SSTA analysis for April 2018.