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During the winter of 1830–31, southern sections of the state were covered with 3 feet (0.91 m) of snow, with drifts up to 6 feet (1.8 m) tall. Storms exceeding the normal winter value are possible within one day mainly in the southern half of the state.
The 2012–13 autumn/winter season would fail to produce a daily maximum temperature below freezing 32 °F (0 °C) until January 1, 2013, the first such time that has happened in Chicago weather records. The entire calendar year of 2012 did not record a temperature lower than 5 °F (−15 °C).
That means arctic air is blasting over the US, while pressure changes and the motion of the polar vortex whip up high winds and create a perfect recipe for wintry weather.
Specific humidity (or moisture content) is the ratio of the mass of water vapor to the total mass of the air parcel. [15] Specific humidity is approximately equal to the mixing ratio, which is defined as the ratio of the mass of water vapor in an air parcel to the mass of dry air for the same parcel.
• Thunderstorms will rumble from the Ohio Valley to the Northeast on Tuesday before becoming more confined to the East by Wednesday. • In the wake of the storms, much cooler and less humid air ...
The National Day of Prayer is an annual day of observance designated by the United States Congress and held on the first Thursday of May, when people are asked "to turn to God in prayer and meditation". The president is required by law (36 U.S.C. § 119) to sign a proclamation each year, encouraging all Americans to pray on this day.
When a winter storm is on the way, everyone rushes to the grocery store. If you don't join them quickly, the shelves could be bare by the time those first flurries fall.
The graph also shows the typical phenomenon of increased temperature ranges during winter. In Campinas, for example, the daily temperature range in July (the coolest month of the year) may typically vary between 10 and 24 °C (range of 14 °C), while in January, it may range between 20 and 30 °C (range of 10 °C).