Jonathan Erdman

On This Date: Hurricane Debby Makes Landfall In Florida One Year Ago | Weather.com Debby was the second of five hurricane landfalls along the U.S. Gulf Coast in 2024.

I'm fascinated by forgotten or overshadowed hurricanes. One of those made landfall one year ago this morning.

Day 5 of upper Midwest #smoke here in southeast WI.

One more day tomorrow, then relief by Wednesday.

Meanwhile, at least some surface smoke may move down the East Coast over the next couple of days.

August Snow Has Happened Before In The US | Weather.com It's still summer, but parts of the nation have seen snow before in August. And it's not just confined to the highest mountains. Here's a brief history of some of the bizarre August snowfalls.

It's "too soon" for most, but there has been August snow before in the U.S., including one year ago.

Some perspective...

On This Date: Cheyenne, Wyoming's Deadly Flash Flood, Hailstorm | Weather.com What happens when a semi-arid climate picks up about half its average yearly precipitation in three hours? Consider what happened in Wyoming's capital city 40 years ago. It wasn't all about the rain, ...

The aftermath of a historic storm 40 years ago today, in one state capital city.

NWS-Aberdeen rated Sunday's photogenic tornado near Watertown, SD an EF2.

Here's a photo from their survey of a destroyed home. The safe was moved onto the front sidewalk, apparently.

On this final day of July, here's how summer stands, so far.

Record warmest-to-date in Raleigh-Durham, Beckley and Elkins, W.V.

Among top 5 hottest-to-date: Louisville (2nd), Nashville & New Orleans (3rd), Atlanta (tie 4th), Philly (5th), Chicago (tie 5th).

Data kudos: SERCC

Bit of a hazy pall outside, and can smell the odor of that wildfire smoke here in the Milwaukee metro.

2 steps I'm taking given wildfire smoke in my area:

1. Despite that it's cooler & less humid, I won't open windows to air out. Give A/C a break, but keep the smoke out.

2. I won't exercise outside. If you have a gym membership or indoor bike/treadmill, use that until smoke levels fall.

The Texas Fourth of July flash flood was the nation's deadliest since 1976.

That Big Thompson Canyon, Colorado, flash flood happened 49 years ago this evening.

weather.com/news/weather...

Today *should* have been a day of sunshine, low humidity and perfect summer temps.

But...wildfire smoke is at unhealthy (code red) or even "very unhealthy" (code purple) levels in the upper Midwest and Great Lakes.

When Does The First Hurricane Of The Atlantic Season Form? | Weather.com We pored through 59 years of data to find out when we can typically expect the first hurricane of the season to happen. The short answer is there's usually a wait involved.

When does the Atlantic Basin's first hurricane arrive? And does it have any predictive value for the season?

We looked at 59 years of data for some perspective.

Couldn't have better weather for the first weekend of August in the Northeast and Midwest. Tolerable temps and *not* muggy.

Tiny Iona, likely one factor explaining its rapid intensification.

50s dew points along the Front Range is considered humid.

Great Lakes analog would be, say, a dew point of 80˚.

Retired Atlantic Hurricane Names Since 1954 A 'Hall Of Infamy' | Weather.com They're the worst storms the Atlantic Basin has generated since the mid-20th century. This "Hall of Infamy" is a list of names no longer used for current or future storms after one version was so dead...

The 99 retired Atlantic hurricane names since 1954.

If your name starts with "I", it has the best chance of being on this "Hall of Infamy" list.

Not all the names were hurricanes.

Another day, another case of rapid intensification.

Iona went from TS to Cat. 3 in 24 hours.

Strongest CPAC hurricane in almost 2 years, since now-retired Dora in early Aug. 2023.

🛰️: CIRA_CSU

What Is A Derecho? | Weather.com One severe thunderstorm is capable of producing strong winds. But when they team up in summer, they can produce widespread wind damage and power outages for hundreds of miles. These are called derecho...

A January 2025 study proposed a slightly altered definition for a derecho, which we could see take place later today & tonight in the N. Plains.

First time in over 5 weeks SPC has issued a level 4 of 5 severe risk anywhere in the U.S.

Also, 13th day this year with a level 4+ severe risk, which lines up with an average year.

(Data kudos: IEM/Daryl Herzmann)

Quite a sunrise in the Milwaukee metro this AM. Some virga, "reddish sky" and a rainbow segment, to boot!

On This Date: All-Time Heat Records Set In Dust Bowl | Weather.com It's typically the hottest time of year in parts of the country, and that was certainly the case in the mid-1930s during the Dust Bowl. Some of these all-time records still stand today.

121˚ on this date....and it wasn't in the Desert Southwest.

Just informed by NWS-Lake Charles the Grand Chenier dew point (which was as high as 91 Tuesday) appears to be erroneous.

2pm NHC outlooks today vs. 1 week ago. Deja vu.

Current dew points:
- Kennett, MO: 84˚
- Grand Chenier, LA and Savannah, TN: 86˚

About as high dew points as you'll see in any summer in the U.S. Lower 48. 🥵

Yes, another spell of heat & humidity is on the way to the Midwest and Northeast.

But a pattern change offers some good news beginning ~ middle of next week. 👀

More flash flooding last night near Ruidoso, NM. Since June 19, 2024:

- 54 flash #flood warnings have been issued by NWS for Ruidoso.
- 176 reports of flooding or debris flows in Ruidoso, Ruidoso Downs or Hollywood, NM on 31 separate days.

Bit of a break later this week, thankfully.

On This Date: America's Largest Hail Fell In South Dakota | Weather.com You may have seen hail at least once or twice before, maybe up to the size of a golf ball. But the hail that fell 15 years ago in one South Dakota town was truly mind-blowing, and record-setting.

15 years ago today, America's record hailstone (in 2 out of 3 metrics)

On This Date: Levee Break Floods Illinois Town | Weather.com Amid one of the nation's historic floods, one of the most frantic evacuations happened on a small island frequently flooded by the Mississippi River throughout its history.

There's an island along the MO/IL border west of the Mississippi River that's actually on the Illinois side.

It was the sight of one of the most dramatic floods of the 1993 summer flood, on this date.

On This Date: A Violent Tornado In Wyoming | Weather.com Each year, we usually see a handful of truly intense tornadoes in parts of the South or Midwest. But in 1987, one such intense tornado touched down near a Wyoming national park.

This is right up there with the most fascinating tornadoes in history: a violent mountain tornado studied in depth by Fujita.

Since June 19, 2024:
- 197 reports of flash flooding near Ruidoso, NM, on 30 separate days
- 53 separate NWS flash flood warnings mentioned Ruidoso
- 12 of those were FF emergencies

(Data kudos: IEM)

Flash flood threat continues through Wed. afternoon.

It's a split week in the Northeast:

- Today - Tue: Refreshingly dry air (If you can, open windows and air out.)

- Friday: Daily record highs possible + muggy air.