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Category Archives: Climate
What is the prediction on the rise of sea level?
The National Oceanic and Atmospheric Administration, or NOAA, routinely monitors sea level and makes predictions of how it will change with time. The observations are based on a combination of tide gauge data and satellite observations.
Continuously tracking how and why sea level is changing is an important part of informing plans for adaptation to global changes. In a recent speech, former President Donald Trump falsely stated that “the ocean will rise 1/8 of an inch over the next 200 to 300 years.” Continue reading
What’s behind November’s 70-degree days?
As the spectacular fall weather continued into November last week we saw temperatures soar into the 70s on the first three days of the month before plummeting back to more normal levels with the passage of a cold front on Saturday afternoon.
The three consecutive days — Nov. 1, 2, and 3 — represented only the fourth time in Madison’s weather history that at least three consecutive days in November registered high temperatures at or above 70 degrees. All of the other instances have occurred since 2008 — Nov. 3-5, 2008; Nov. 2-4, 2015, and the all-time longest such streak, which occurred Nov. 5-9, 2020. In addition, the latest-ever 70-degree day in a Madison November occurred on Nov. 17, 2016. Continue reading
Will we hit 80 degrees again this year?
We will not see 80 degrees again this year.
The last time Madison was officially 80 degrees or warmer was Sept. 21, the last official day of summer. In fact, 13 of the first 21 days of last month we were at least that warm — fairly remarkable. Continue reading
Can dust from Africa reach the United States?
Yes. Soil-derived aerosols, or dust, are abundant in our atmosphere. One source of dust is sandstorms over the Sahara. These storms whip small pieces of mineral dust from the desert into the atmosphere. Easterly winds then carry large plumes of Saharan dust away from the desert and over the Atlantic Ocean.
This weather system is referred to as a Saharan air layer, or SAL, and at times dust in the SAL has traveled to the Caribbean, Texas and Florida. Desert dust from the Sahara and Gobi deserts has been observed on the ice sheet of Greenland. Ice cores in Greenland provide a history of the dust deposition as it appears as layers in the ice. Continue reading
Category: Climate, Meteorology, Seasons
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What are the wettest and driest days of Madison’s warm season?
All things considered, we have really had a rather benign summer in southern Wisconsin thus far this year. Through Friday of last week, July was averaging just over 1 degree warmer than normal, with the majority of the contribution to this slightly warm month coming in the overnight lows, which have been 1.5 degrees above normal thus far. In addition, except for the 1.23 inches of rain we received when the heat broke July 23-24, we would be just about normal for July.
Somehow we got thinking about some characteristics of warm-season (May through October) precipitation in Madison in the midst of this spell of fine summer weather. Dr. Ed Hopkins at the State Climatologist’s Office was on the ready for our question, which was: What are the wettest and driest calendar days during the warm season in Madison? By “wettest” we mean the calendar day on which the most total accumulated precipitation has been recorded in Madison’s 153-year climatological record — and the least for the “driest” day. Continue reading
