Why do we have frost when low temperatures at night are in the 40s? Golfers are made to wait until the frost melts before they can tee off.
– Tom Mezyk
The National Weather Service, following international standards, measures air temperatures at a height of four to five feet above the ground. On clear, calm and dry nights when heat radiates strongly away from the ground (so-called “radiative cooling”), air temperatures right at ground level sometimes drop 5 to 8 degrees lower than readings at thermometer height. In addition, surfaces such as blades of grass chill even more quickly than the ground-level air in which they are immersed. One result of this localized cooling is frosty grass even though “official” air temperatures are 5 to 10 degrees above freezing. Frost that forms on such nights disappears quickly in direct sunlight or when a morning breeze begins to stir.
Up to a foot of snow fell over 4 different southern states last night and today. Locally, Chicago’s northern suburbs were hit the hardest from the weekend storm.
For the very latest, including a complete listing of snowfall totals, follow the link below to the WGN Severe Weather Blog http://weblogs.wgntv.com/chicago-weather/severe-weather/
Below: Snow, still falling at a good clip in Howe, Texas at 8:15AM Sunday.
The first snow of the entire month of March is just about over. A few flurries or sprinkles are still possible through the afternoon, but the bulk of the precipitation is over.
Here are a few storm totals from across the Chicago area
5.0″ Lake Forest
3.9″ Elk Grove Village
3.5″ De Kalb
2.1″ Downers Grove
2.0″ Chicago- Wrigley Field
1.8″ Chicago- O’Hare
Below: The snow is already starting to melt this morning in north suburban Wadsworth.
Chicago escaped the latest spring storm rather unscathed compared to some of our neighbors to the south. Up to a foot of new snowfall is being reported this Sunday morning across portions of four southern states The snow extended as far south as north Texas where some suburban residents of Dallas awoke to over a half foot of snow.
Here are some of the storm totals Below: Fayetteville, Arkansas at 8:15 this AM
12.0″ Fayetteville, AR
12.0″ Fort Scott, KS
12.0″ Jerico Springs, MO
12.0″ Siloan Springs, OK
11.5″ Westville, OK
8.3″ Carbondale, KS
8.0″ Plano, TX
8.0″ Miami, OK
8.0″ Sadalaia, MO
5.6″ McKinney, TX
Below: Winter Storm Warnings are still in effect this Sunday morning from Kansas City, Missouri to Dallas, TX
After a mostly cloudy cool day Sunday, astronomical spring will shift
in gear Monday and with winds shifting to the southwest temperatures
are expected to return to the 60-degree level by Tuesday afternoon.
This means the thin layer of snow deposited over much of the area
Saturday–greatest amounts were between 2 and 3 inches–will probably
be gone, perhaps as soon as Monday.
Heavy snows to the south
a strong low pressure system tracks east out of the southern plains,
Winter Storm Warnings were posted for eastern Oklahoma, southeast
Kansas, Southwest Missouri and northwestern Arkansas where
Saturday-Sunday snowstorm totals of 6 to 12 inches were forecast. The
cold air was to moderate, with primarily rain expected as the low
center tracks east reaching the mid-Atlantic coast Tuesday.
Warmup next weekend
through Friday northeastern Illinois temperatures are expected to
average a little above seasonal norms with 60-degree readings marking
the return of strong southerly winds the start of next weekend.