The same day, a high temperature of 91 degrees was recorded in Topeka, Kansas, and heat consultants was released.
Yes, but each National Weather Service (NWS) office has different criteria for heat advice and excessive heat warnings that take into account the topography, climatology of the region, and potential urban heat islands.
For example, it was very hot in Miami on Tuesday, but it did not meet the technical requirements for a warning or warning.
To get heat tips, they must have a heat index value of 108 degrees or higher in Miami for at least two hours. To warn of excessive heat, the heat index should reach 113 degrees or more for at least two hours.
Tyler Mauldin, a CNN meteorologist who has worked in Florida for nearly 10 years, explains that the sea breeze plays a key role in temperature variability across Sunshine State.
“Weather in Florida is strongly influenced by wind direction,” he said. “The open sea wind is a very hot wind for Miami, which is exactly what we had. It prevents the movement of colder air from the Atlantic. Add a little dry air with dew points in the ’60s, and that’s a recipe for dangerous temperatures.”
Miami had not just one hot day this year, but weeks and weeks of intense heat. In fact, seven of the 10 warmest weeks of filming have taken place this year – and high temperatures in Miami traditionally don’t reach until early August.
The criteria for excessive heat vary
Again, it all comes down to different criteria. In Columbia, the heat index must reach at least 110 degrees to have heat advice. In Minneapolis, heat advice is issued when the heat index reaches 95 degrees.
Another criterion used by some services for the National Meteorological Service, such as the one in Minneapolis, is a measurement called a wet bulb thermometer.
The military has used this tool for decades. The humid bulb thermometer includes more details like the angle of the sun, clouds and wind speed. This is especially important to know if you know that you are doing rigorous efforts outside, exercising or following youth sporting events.
In Minneapolis, the criterion for heat counseling is a 95-degree heat index value or an 86-degree wet bulb reading.
Philadelphia has its own heat bubble
Philadelphia has its own guidelines called the Kalkstein Procedure.
Simply put, their research concluded that heat and humidity levels below the criteria that triggered the advisory impact on urban locations caused adverse effects due to the presence of a widespread area and population density.
The Philadelphia NWS office not only uses different criteria for urban and rural locations, but also breaks them down separately according to the time of year.
Why? Well, people may not be used to the 90-degree day on April 1st, but it will probably be on July 20th.
The following criteria are used for the metropolitan areas of Philadelphia, Trenton, and Wilmington:
Thermal indices of 96 to 104 degrees are expected from May 1 to June 15.
From June 16 to 30, heat indices of 98 to 104 degrees are expected.
From July 1 to September 30, heat indices of 100 to 104 degrees are expected.
In areas of Delmarve and southern New Jersey, the threshold is a heat index reading of 105 degrees or more for at least two hours. Everywhere around Philadelphia the threshold is at least two hours of 100 degrees or more.
Dry heat is different
The criteria are changing again in the southwestern desert.
Because it is so hot in the desert most of the year, NWS offices in the Southwest do not issue heat advice, but only excessive heat warnings.
The Las Vegas office at NWS reported weather for the highest altitude flow and lowest altitude in neighboring U.S. states – Mount Whitney and the Badwater Basin in Death Valley, says Jenn Varian, a meteorologist at the office.
“Death Valley regularly exceeds 115 degrees in the summer, but areas like Mount Whitney don’t,” Varian said. “So altitude, the type of terrain in the west, and even the time of year, play a big part in the way these excessive thermal warnings are issued.”
Several northwestern SZS offices also take into account the number of tourists coming to the city and the passing population who are not accustomed to the extreme desert heat.
Security is key
It all comes down to how best to protect the public from a variety of heat illnesses, including heat cramps, exhaustion, and stroke. These tips and warnings serve as a guideline that reflects the likelihood of certain heat-related difficulties and even possible death from heat exhaustion.
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