Kim Wood
@drkimwood
Associate professor at UArizona. Hurricane mortician. Science communicator. Open science + Python + 🐈 enthusiast. This is my only bsky account. Opinions mine.
One factor supporting the forecast for intensification is relatively warm water along the storm's expected path as captured by Argo floats. However, Lala has been ingesting dry air, which limits how much it could intensify before affecting land.
Since 1970, 27 tropical cyclones (TCs) have approached within 250 km of the Hawaiian islands. Tropical Storm #Lala is expected to become the 28th. Lala's expected motion would increase right-of-track onshore flow in mountainous terrain, exacerbating freshwater flooding and mudslide concerns.
The Niño 3.4 region isn't just warm at the ocean surface: that (well-mixed!) warmth extends rather deep too as shown by recent Argo float measurements.
The equatorial Pacific and the region where most eastern north Pacific tropical cyclones form sure are warm relative to the rest of the tropics.
54-hour animation (just over 2 days) of infrared satellite imagery (left) and NHC estimated intensity (right) for eastern North Pacific Hurricane Genevieve, which strengthened by 60 kt in 24 hours, later briefly achieving category 5 status. Satellite images extend ~600 km from the storm center.
The two invest areas that the NHC is currently watching in this part of the eastern North Pacific (circled in purple below) sure won't be limited by energy from the ocean.
Yesterday's value of 29.71⁰C is the highest daily average for this region during the time frame of 1982 to present, just barely beating the record set on 11 August 2023 (29.7⁰C) 🫠 The dashed box region for averaging (see inset map) encompasses 10-20⁰N and from 124⁰W to the North American coastline.
That said, the ENSO monitoring region (Niño 3.4, black dashed box on inset map) continues its warming trend relative to the global tropics (20°S-20°N) as shown by the black line in the time series. The purple dashed line shows the ENP MDR, which appears to be keeping pace with the Niño 3.4 values!
A few notes here: - region spans 10-20°N, the main development region in the eastern North Pacific, *not* the ENSO monitoring region - it's very warm in the ENP MDR, but that warmth tends to be shallow as captured by Argo float profiles - SST gradient NW of the ENP MDR is still present (but shifted)
7-day running means of daily ENSO longitude index (ELI) values from NOAA's OISST for 1997, 2015, 2023, and 2026 (so far). ELI approximates the longitude of the rising branch of the Pacific Walker circulation: higher values are farther east (more El Niño), lower values farther west (more La Niña).
Pretty sunset thunderstorm rolling through the mountains north of Tucson may have sparked a wildfire this evening (blurry due to extreme zoom). Is it possible to submit sightings via Watch Duty?
Many tropical ocean regions used in SST monitoring are warmer than the tropical mean as of late, with two exceptions: the Niño 1+2 region off the Pacific coast of South America and the North Atlantic main development region (MDR).
Charts of daily sea surface temperatures (SSTs) in the Niño 3.4 monitoring region since April 20 show a warming trend, followed by a plateau, followed by another spike in SSTs... now well above any year for this date since 1982.
The past week has been busy in the eastern North Pacific as the first three named storms of the season (Amanda, Boris, Cristina) formed. Amanda was one of the farthest west TC formations on record for June. Boris and Cristina are both expected to remain tropical storms while producing heavy rain.
The first tropical cyclone (TC) of the 2026 eastern North Pacific hurricane season formed yesterday, June 2, in a region where development is rare for this time of year. It's expected to reach tropical storm (and thus named) status later today.
Here are a few recent Argo profiles along EP01's expected path. The blue line is the profile closest to the storm, showing a shallow layer of quite warm water near the eastern North Pacific's first tropical cyclone of the season. (Argo, the blorbo from my livestream?)
The warmest spots vary a bit from day to day, but overall, the area in the eastern North Pacific where most of this basin's tropical cyclones (TCs) tend to develop—the ocean region within the dashed box on the inset map—is extremely warm for this time of year.
The ridiculous heat wave hitting western Europe is showing up in SST anomalies as well, with many locations now exceeding daily anomalies of +3°C. 🥵
Relative sea surface temperatures (SSTs) on a daily basis for 2026 (through 17 May), 2015, 1997, and 1982. The latter three years are shown as points of comparison given that they were also El Niño onset years.
Evolution of daily sea surface temperature (SST) anomalies over the tropical Eastern Pacific during the first half of May 2026 from NOAA's OISST dataset. The colorbar shows the % of pixels in each 0.5°C bin. Edge bins contain all values below -3°C (darkest blue) or above +3°C (darkest red).
With hurricane season once again upon us, here's my resource page on "ingredients" that support TC formation: 1) warm ocean water 2) atmospheric moisture 3) low vertical wind shear 4) atmospheric instability 5) distance from the equator 6) a "seed" disturbance kouya.has.arizona.edu/tropics/ingr...
multiple ocean regions as warm as or much warmer than 2024 and 2025. which were not impending El Niño years. on May 11.
New SST monitoring product is being tested! This chart shows relative SST from NOAA's daily OISST dataset, here plotted through 4 May 2026.
Periodic reminder of the daily SST monitoring page that I maintain for several regions as shown below: kouya.has.arizona.edu/tropics/SSTm...
Evolution of daily sea surface temperatures (SSTs) during 1-22 April 2026 in the western portion of the eastern North Pacific. 🥵