Loren D. White

@sambrandt99 Honestly, my impression is that there have not been adequate observations or studies to properly categorize them. Some seem very similar. But others have differences in topography, surface processes, and synoptic environment that confuse the situation.

@LDWhiteWx I’m not understanding these international drylines that people refer to. If a boundary’s propagation and vertical circulation are being driven by density differences, then it’s a regular cold or warm front. Cold fronts typically have drier air on the cold side, so…

One of the best (though simplified) descriptions of the typical diurnal dryline in the Southern Plains. Processes may be a bit different for drylines in other parts of the world.

Trump regime again tries to shutter all NOAA labs in its 2027 White House budget. open.substack.com/pub/balancedwe…

@ametsoc A good example from Wakimoto et al 2006. Probably all Glossary entries should be tied to peer-reviewed source. doi.org/10.1175/MWR306…

@ametsoc Surprisingly this is actually in the Glossary! Extremely embarrassing. From a quick Google Scholar search, apparently it was in use during the 1930s-1950s in tropical meteorology. Very obsolete. Yet the credible modern mid-latitude use is ignored by the Glossary.

TERM OF THE WEEK 💬 Triple point — A junction point within the tropics of three distinct air masses, considered to be an ideal point of origin for a tropical cyclone. Explore more terms like triple point through the AMS Glossary: bit.ly/4v9FCz6

@AndyHazelton The heights of the measurements and averaging time also need consideration as inland surfaces strongly impact temporal and vertical variability.

Interesting study by Cameron Masiello at NC State looking at how winds decay inland in landfalling TCs. Check out that exponential dropoff in the first few minutes as the parcels move inland. Nice illustration of why, along with sparseness of observations, that wind measurements often seem "low" in landfalling systems. #AMS37Hurr

Storm ready: @NOAA’s new mobile #radar fleet bridges gap between research and weather safety News release: noaa.gov/news-release/s… via @NOAAResearch

@weatherdak As many times as I've watched this loop, I just now noticed cute little cyclonic swirl along the Moroccan coast.

An 800+ mile long haboob sweeping across northwest Africa. My oh my...

A huge dust storm advancing across the western Sahara @tomgillpredicts

Learn how MPAS is gaining ground as WRF’s successor, with research and operations shifting across sectors. The NWS Director at AMS2026 urged a unified modeling foundation, calling for academia, government, and industry to align and collaborate. Register: bit.ly/4lL9Owh

@blamarre The cloud pattern in the northeast Gulf was interesting today as the dry air mass moistened under easterly flow.

A “Back Door” Cold Front is Moving Through Florida Tonight. A less typical setup is unfolding across Florida this evening, that is, a back door cold front is pushing southwest across the state from the north and northeast, rather than the usual direction from the north and northwest. So how does this happen? 🤔 A ridge of high pressure centered off the Virginia coast is extending southwest along the Mid-Atlantic and into northeast Florida. This setup directs a cooler and drier northeast flow down the peninsula, helping the front slide in “through the back door.” Right now, precipitable water (PWAT) values are around 1.5 inches, signaling plenty of moisture in the atmosphere, but that moisture is being funneled southwestward behind the front instead of northward like in more typical patterns. At the mid-levels (around 18,000 feet), temperatures are cold with readings between near -13°C and -12°C which creates enough instability to spark thunderstorms, especially where moisture and lift overlap. This setup is playing out over parts of Hillsborough County (well east of Tampa) and Polk County this evening. #flwx

@ameliaUrquhart_ Really confusing that you posted cross-sections from 36 N and 13 S. Polar lows are actually extratropical cyclones, just not classical midlatitude cyclones. Having a weak warm core is not so unusual, although this is of course a nice example.

While I came in here to say "no it's not tropical that's ridiculous," he might have a point. Cross sections show that the isentropes near the core bend downward a bit, much more like a hurricane than an extratropical cyclone. (1/2)

Our atmosphere is powerful, complex, and sometimes just straight up.... freaky. Open and closed cell stratocumulus oscillate as ships cut through them forming tracks in the clouds.

@weatherdak That's the best view of it that I've seen so far.

A dusty "medicane" swirling over the Mediterranean Sea.

A trippy trio of swirls in the Gulf of Alaska. A fascinating view.

🌧️ Flooding continues in northern & northeastern Australia. Rivers in the Northern Territory and Queensland remain flooded. North: More showers and storms may bring heavy rain. Rivers may keep rising. Eastern Queensland: Rain will ease, but river levels may stay high for days. ⚠️

Storm-following birth-to-death loop of the supercell (well, supercells) responsible for multiple tornadoes last night in OK/KS

@aguacerowx Is the vertical axis necessarily linear in pressure? The upper troposphere is extremely compressed when not in log-pressure or height.

🚨 Cross Sections are here! - 📊Use the toolbar or hold crtl+drag to generate a cross section! You can compare model differences - 🗺️On sounding maps w/ layers - Save sounding preferences - NBM 🌧️precip/🔥fire/⛈️severe variables All for FREE here: aguacerowx.com

@weatherdak Also seem to be some gravity wave emanating out from it.

An incredibly cool thunderstorm complex in the Gulf yesterday. Oodles of lightning and some rotation.

Treetops Emit Ultraviolet Sparkles During Thunderstorms. Researchers Just Filmed It in Nature for the First Time - smithsonianmag.com/smart-news/tre… @smithsonianmag