Jordan Clark, Phd

If @ametsoc.org or @nwas.org ever gave out a "Graphic of the Year" award, it should go to Jay Cordeira, displaying the synoptics behind the Predecessor Rainfall Event before #Helene

It's an amazing graphic and displays our double whammy of 'rain and then more rain.'

Record heat now outnumbers record cold by more than 3 to 1 in the US. In a normal climate, they’d be equal. After billions of years of natural hot & cold cycles, human forcing has now overtaken nature as the longterm driving force of our present & future climate.

It's cold out there. Like 40s and 50s and stuff. Brrr.

Nice swath of record/near record chill this morning from the Midwest to Mid-Atlantic region.

A map of Spain with the total eclipse path marked. It travels from Oviedo in the NW down to Palma in the SE. A colour scale marks the average August cloud cover from 20 years worth of data. There are pockets with <10% chance of clouds along the path of totality. From https://eclipsophile.com/tse2026/

A total solar eclipse. Whispy clouds cover a dark circle with a ring of bright light around it. On one side is an especially bright light, like a diamond on a ring.

Mark diaries: 1 yr from today!

12th Aug 2026: total solar eclipse🌞🌚🌍 for Northern Spain, Greenland and West Iceland.

Where's the best spot? Well eclipsophile.com has kindly calculated the average Aug cloud cover & Spain looks v promising 🧪🔭

📷: M Tomasso
ℹ️: www.timeanddate.com/eclipse/sola...

Congrats, Raleigh! After the warmest July on record 🥵 (since 1887), you followed up with the coldest high temps 🥶 on record for the first week of August!

Graph showing frequency of 4 consecutive days with a high temperature below 75F. Note the lack of periods between June and August, with the only data point being the current 2025 streak in early August.

Very fall like August start in Upstate SC due to persistent Cold Air Damming, #CAD.

Greenville, SC had 4 consecutive days (2,3,4,5 Aug) w/ a high 🔽 75F. Unprecedented in #KGSP 63-yr record for this time of year.

Yet only 10 days removed from back-to-back 100F record highs in late July. 📈📉🎢 #SCwx

Japan broke it's All-time NATIONAL heat record for the 2nd time in... checks notes... less than a week!
It's not coincidence. It's climate change.
Japan is surrounded by the most anomalously hot water on the planet right now. The city of Isesaki hit 107 - it's in a valley NW of Tokyo. 1/

The average July 2025 dew point temperature for the Lower 48 was 1.2F above the 1991-2020 normal. Most areas of the map are dark green or blue - except for the very dry Southwest.

On a more serious note - temperatures will already warm up again tomorrow, with highs nearing 90 again along I-95 [left].

There's just one thing still missing from this seemingly typical summer day - the humidity [right].

How come? (short thread below)

ERROR 404: Summer humidity not found

A pretty rare and hot forecast for our area.🔥🌡️ A temperature of 100° is relatively rare in any given year in Charlotte. Multiple 100° days in a year are even rarer, and the rarest of them all is 5 in a row. It's only happened once in our history since 1878. Stay cool and stay hydrated. #cltwx

Why A Massive Lightning Strike In South Carolina Was So Dangerous 20 people were injured in a massive lightning strike in South Carolina this week. Witnesses say it came "from the blue" without rainfall. Our experts explain.

Did you hear about 20 people injured yesterday in a "bolt from blue" lightning strike while at a lakefront beach park near Columbia, SC? My breakdown of what may have happened and cautionary notes about summer lightning. Thanks Jordan McLeod, South Carolina Weather
www.forbes.com/sites/marsha...

#RAH issues Hazardous Weather Outlook (HWO) at Jun 25, 11:45 PM EDT ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 7 PM EDT THURSDAY... Link

and publication coming soon!

🔗 Sign-ups & resources:
• Alerts → epi.dph.ncdhhs.gov/oee/climate/...
• Program info → www.dph.ncdhhs.gov/epidemiology...
• Cooling without AC → nicholasinstitute.duke.edu/sites/defaul...

Developed in partnership between our team at the Heat Policy Innovation Hub at Duke University's Nicholas Institute (@dukepress.bsky.social) & NC department of Health and Human Services.

2025 Updates:

• 📅 Smart seasonality – thresholds rise mid-summer and fall in Sept, matching our bodies’ heat adaptation.
• 🗺️ 8 climate zones – coast to Blue Ridge, each tuned to local health data.
• 📈 Proven impact – early-season identification of dangerous days tripled (late season doubled).

🌡️ NC Heat Health Alert System update: the entire state—and much of the US—is having a very hot week. Even the Appalachians hit a heat-index of 90–97 °F today; up there that’s the level where ER visits jump. Heat is, by far, our deadliest weather hazard.

2025 Updates:

• 📅 Smart seasonality – thresholds rise mid-summer and fall in Sept, matching our bodies’ heat adaptation.
• 🗺️ 8 climate zones – coast to Blue Ridge, each tuned to local health data.
• 📈 Proven impact – early-season identification of dangerous days tripled (late season doubled).

#Heat risk is hyper-local. Clouds, wind, and surface types—like grass or concrete—can quickly shift how heat is felt over short distances.

Klimo Insights uses satellites, land data, and weather models, among other inputs, to generate #WBGT estimates that reflect real-world conditions where you are.

Today's heat keeps climbing—tomorrow will be hotter.
Unlike the heat index—which reflects shaded conditions—#WBGT accounts for sun, wind, and humidity to show actual heat stress risk. Check your local forecast with our app: wbgt.klimoinsights.com

#HeatWave

Klimo WBGT — An App for Wet Bulb Globe Temperature WBGT app that provides the current WBGT for any location. Access forecasts, document current WBGT, and more with Klimo WBGT.

You can also instantly get hyper local #WBGT data for your location from @klimoinsights.com's newly released app: wbgt.klimoinsights.com

#heatstress #heat #heatwave

as well as forecasts! wbgt-forecast.klimoinsights.com

The early season #heatwave across the Eastern US is in full force. Fascinating to watch the near real-time #WBGT map of the US—see current heat stress levels here: wbgt-live.klimoinsights.com Stay hydrated! @klimoinsights.com

Population estimate for exposure to Extreme NWS HeatRisk at some point over the next 7 days. At least 94 million potentially exposed. Impacts likely in most health systems, heat-sensitive industries, and infrastructure. Stay hydrated, avoid direct sun, check on the elderly and pets! #HeatWave2025

Lots of Heat Advisories (orange), Excessive Heat Watches (dark red), and Excessive Heat Warnings (dark magenta) for the Contiguous U.S. (plus pink areas for Red Flag Warnings). Seems not fun.

🔥 All eyes on DC’s first major heat wave of 2025 - it's going to be intense (once this stormy stretch ends Thurs)

Sunday: Mid-90s
Mon–Wed: Upper 90s, feels like 110
Could last 5-7 days!

📖 Full briefing: www.washingtonpost.com/weather/2025...
Pictured: Forecast heat index Monday

Some real-deal heat brewing early next week. When ensembles start hinting at 100F potential, they get our attention

There it is. The first ever Heat Advisory issued in Alaska. This is the first year it has been an option. @alaskawx.bsky.social

As always, thank you to the #NWS for the prompt and accurate warnings!