The thunderbolt steers all things. —Heraclitus, c. 500 BC
After the rain. Personal photograph taken by Mike Anthony biking with his niece in Wirdum, The Netherlands
Today at 15:00 UTC we examine the technical literature about rainwater management in schools, colleges and universities — underfoot and on the roof. Lightning protection standards will also be reviewed; given the exposure of outdoor athletic activity and exterior luminaires.
We draw from previous standardization work in titles involving water, roofing systems and flood management — i.e. a cross-cutting view of the relevant standard developer catalogs. Among them:
American Society of Civil Engineers
American Society of Plumbing Engineers
ASHRAE International
ASTM International
Construction Specifications Institute (Division 7 Thermal and Moisture Protection)
The “lightning effect” seen in carnival tricks typically relies on a scientific principle known as the Lichtenberg figure or Lichtenberg figure. This phenomenon occurs when a high-voltage electrical discharge passes through an insulating material, such as wood or acrylic, leaving behind branching patterns resembling lightning bolts.
The process involves the creation of a temporary electric field within the material, which polarizes its molecules. As the discharge propagates through the material, it causes localized breakdowns, creating branching paths along the way. These branching patterns are the characteristic Lichtenberg figures.
In the carnival trick, a high-voltage generator is used to create an electrical discharge on a piece of insulating material, such as acrylic. When a person touches the material or a conductive object placed on it, the discharge follows the path of least resistance, leaving behind the branching patterns. This effect is often used for entertainment purposes due to its visually striking appearance, resembling miniature lightning bolts frozen in the material. However, it’s crucial to handle such demonstrations with caution due to the potential hazards associated with high-voltage electricity.
“Benjamin Franklin Drawing Electricity from the Sky” 1816 Benjamin West
Benjamin Franklin conducted his famous experiment with lightning on June 10, 1752.
He used a kite and a key to demonstrate that lightning was a form of electricity.
This experiment marked an important milestone in understanding the nature of electricity
and laid the foundation for the development of lightning rods and other lightning protection systems.
Seasonal extreme weather patterns in the United States, resulting in damages to education facilities and delays in outdoor athletic events — track meets; lacrosse games, swimming pool closures and the like — inspire a revisit of the relevant standards for the systems that contribute to safety from injury and physical damage to buildings: NFPA 780 Standard for the Installation of Lightning Protection Systems
This document shall cover traditional lightning protection system installation requirements for the following: (1) Ordinary structures (2) Miscellaneous structures and special occupancies (3) Heavy-duty stacks (4) Structures containing flammable vapors, flammable gases, or liquids with flammable vapors (5) Structures housing explosive materials (6) Wind turbines (7) Watercraft (8) Airfield lighting circuits (9) Solar arrays
This document shall address lightning protection of the structure but not the equipment or installation requirements for electric generating, transmission, and distribution systems except as given in Chapter 9 and Chapter 12.
(Electric generating facilities whose primary purpose is to generate electric power are excluded from this standard with regard to generation, transmission, and distribution of power. Most electrical utilities have standards covering the protection of their facilities and equipment. Installations not directly related to those areas and structures housing such installations can be protected against lightning by the provisions of this standard.)
This document shall not cover lightning protection system installation requirements for early streamer emission systems or charge dissipation systems.
“Down conductors” must be at least #2 AWG copper (0 AWG aluminum) for Class I materials in structures less than 75-ft in height
“Down conductors: must be at least 00 AWG copper (0000 AWG aluminum) for Class II Materials in structures greater than 75-ft in height.
Related grounding and bonding requirements appears in Chapters 2 and Chapter 3 of NFPA 70 National Electrical Code. This standard does not establish evacuation criteria.
University of Michigan | Washtenaw County (Photo by Kai Petainen)
The current edition is dated 2023 and, from the transcripts, you can observe concern about solar power and early emission streamer technologies tracking through the committee decision making. Education communities have significant activity in wide-open spaces; hence our attention to technical specifics.
Public input on the 2026 revision is receivable until 1 June 2023.
We always encourage our colleagues to key in their own ideas into the NFPA public input facility (CLICK HERE). We maintain NFPA 780 on our Power colloquia which collaborates with IEEE four times monthly in European and American time zones. See our CALENDAR for the next online meeting; open to everyone.
Lightning flash density – 12 hourly averages over the year (NASA OTD/LIS) This shows that lightning is much more frequent in summer than in winter, and from noon to midnight compared to midnight to noon.
Issue: [14-105]
Category: Electrical, Telecommunication, Public Safety, Risk Management
Colleagues: Mike Anthony, Jim Harvey, Kane Howard
Didn't really plan for all possibilities, did they. 🤓
Churches and chapels are more susceptible to lightning damage due to their height and design. Consider:
Height: Taller structures are more likely to be struck by lightning because they are closer to the cloud base where lightning originates.
Location: If a church or chapel is situated in an area with frequent thunderstorms, it will have a higher likelihood of being struck by lightning.
Construction Materials: The materials used in the construction of the building can affect its vulnerability. Metal structures, for instance, can conduct lightning strikes more readily than non-metallic materials.
Proximity to Other Structures: If the church or chapel is located near other taller structures like trees, utility poles, or buildings, it could increase the chances of lightning seeking a path through these objects before reaching the building.
Lightning Protection Systems: Installing lightning rods and other lightning protection systems can help to divert lightning strikes away from the structure, reducing the risk of damage.
Maintenance: Regular maintenance of lightning protection systems is essential to ensure their effectiveness. Neglecting maintenance could result in increased susceptibility to lightning damage.
Historical Significance: Older buildings might lack modern lightning protection systems, making them more vulnerable to lightning strikes.
The risk can be mitigated by proper design, installation of lightning protection systems, and regular maintenance.
Williams College is a private liberal arts college located in Williamstown, Massachusetts, USA. Founded in 1793, it is one of the oldest institutions of higher education in the United States. The college was established through a bequest of Colonel Ephraim Williams Jr., a war hero who died in the Battle of Lake George during the French and Indian War. In his will, Colonel Williams left funds for the establishment of a free school on the condition that it be located in Williamstown.
US Department of Agriculture | § 58.2825 United States Standard for ice cream.
Southern ice cream often differs from ice cream in other regions of the U.S. in several ways, reflecting regional tastes, ingredients, and traditions:
Flavors and Ingredients:
Pecans and Pralines: Southern ice cream frequently incorporates pecans and pralines, which are popular in the region.
Peaches: Georgia is known for its peaches, so peach-flavored ice cream is a Southern staple.
Sweet Tea and Bourbon: These flavors are inspired by Southern beverages and can be found in ice creams.
Buttermilk: Buttermilk ice cream has a tangy flavor and is a nod to traditional Southern cooking.
Style and Texture:
Custard Base: Southern ice cream often uses a custard base, which includes egg yolks, giving it a richer and creamier texture compared to the typical Philadelphia-style ice cream that uses a simpler cream and sugar base.
Churned at Home: Traditional Southern ice cream is often made using hand-cranked ice cream makers, producing a different texture and incorporating more air, which can make it lighter and fluffier.
Historical Influence:
Cultural Heritage: The South’s diverse cultural heritage influences its ice cream, with recipes passed down through generations and reflecting African American, Native American, and European influences.
Popular Brands and Shops:
Regional Brands: Brands like Blue Bell, which originated in Texas, are particularly popular in the South and known for their classic Southern flavors.
Local Shops: Small, local ice cream parlors in the South often offer unique, homemade flavors that highlight regional ingredients and traditions.
These differences highlight the South’s rich culinary traditions and how they extend even to sweet treats like ice cream.
Spoon University was founded in 2013 by Sarah Adler and Mackenzie Barth, two Northwestern University students. Living off-campus, they struggled to cook and navigate local dining options, noticing a lack of food media tailored to college students. They launched a food-focused magazine and website at Northwestern, which quickly grew to over 100 student contributors.
The platform expanded to other campuses, driven by student interest, becoming a crowd-sourced food network for millennials. By 2015, it raised $2 million in funding and now operates chapters at over 200 campuses worldwide, offering recipes, reviews, and food-related content
🔎 We spy some extra special visitors! Students of many ages attend summer camps on UAA’s Anchorage campus. From engineering and anthropology to real estate and journalism, there’s a camp for every interest. View the slideshow ▶️ https://t.co/8tAvPRKKzV. pic.twitter.com/s9fb4IfUDp
🖼️ The newly established UAA Art Collection Stewardship Fund aims to make UAA’s diverse art collection accessible to the public. Learn more and explore the public art gallery ▶️ https://t.co/T2i9CAFLuE! pic.twitter.com/q6Vpzp9AFB
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwBpic.twitter.com/GkAXrHoQ9T