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File: 500mb_heightanomaly_Feb2021_2018_620_darkgray.png

Map of North America showing 500-mb height anomalies on February 20-21, 2018

Image caption

500-mb height anomalies over the United States for February 20-21, 2018. Positive height anomalies (oranges) correlate with warmer than average surface temperatures, while negative height anomalies (purples) correlate with colder than average temperatures. During the period, record-breaking warm temperatures were observed over the eastern United States. NOAA Climate.gov map, based on NCEP/NCAR Reanalysis data.