If soil moisture is short when the dry and hot pattern sets in, corn pollination can be affected, and lower yield is possible. That upper-atmosphere high is, in turn, a pattern that brings drier and hotter conditions to the central U.S. When La Nina is in effect, upper-atmosphere high pressure tends to be the dominant feature during the midsummer period. growing season is a challenging crop weather maker for corn going into pollination-which is still ahead for the majority of the corn crop.
#Precipitation totals noaa plus#
That value is considerably higher than in late June of either 2021 or 2020 when the SOI value was around plus 2.0. The 30-day SOI moving average as of June 30, 2022, was plus 19.3. The Pacific circulation numbers are definitely in the La Nina phase. During El Nino, the SOI is negative, and the anomalies are reversed." A post from NOAA's explains that the SOI "compares the difference from average air pressure in the western Pacific, measured in Darwin, Australia, to the difference from average pressure in the central Pacific, measured at Tahiti.During La Nina (positive SOI), the pressure is higher than average over the central Pacific near Tahiti, and lower than average over Australia. The SOI tracks the relationship in barometric pressure between the island of Tahiti in the central Pacific Ocean and the city of Darwin in the Northern Australia Territory.
The atmospheric component of La Nina is noted by the Southern Oscillation Index, which is usually referred to as the SOI. The cool-water phase of the equatorial Pacific Ocean temperature and atmospheric pattern is now in its third year, and summer 2022 shows the strongest La Nina atmospheric measurement of this multi-year run for this point in the year. (Australia Bureau of Meteorology graphic) The Australia SOI 30-day moving average at the end of June is above the peak La Nina values of the 20 crop seasons.
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