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NGFS detections of a small marsh fire in Brookfield WI

A fire on Sunday 9 March in suburban Milwaukee (Milwaukee Journal Sentinel articles 1, 2, 3; I read it about it in the paper: Page 1; Page 2) burned about 100 acres just north of Capitol Drive as shown in the 10 March 2025 image above from the Journal Sentinel. What kind... Read More

A fire on Sunday 9 March in suburban Milwaukee (Milwaukee Journal Sentinel articles 1, 2, 3; I read it about it in the paper: Page 1; Page 2) burned about 100 acres just north of Capitol Drive as shown in the 10 March 2025 image above from the Journal Sentinel. What kind of alert did NGFS provide for this small fire? The slow animation below shows the NGFS Microphysics RGB from routine CONUS scanning (that is, every 5 minutes; mesoscale sectors producing imagery every minute were positioned elsewhere on the 9th). The first NGFS alert was at 1846 UTC, a bit after the 1:39 PM 911 call that alerted first responders.

NGFS Microphysics RGB at 1836, 1841, 1846, 1851 and 1856 UTC on 9 March 205 (Click to enlarge)

NGFS imagery includes Google Maps that can inform a user about the location where the burn is detected. The slider below reveals the pixel size relative to the burning region, the marsh that burned, and the roads and businesses near the fire. (Here’s another google maps viewdirect link — that includes the Ford Dealership mentioned in the article, and a circle that highlights the intersection at the bottom of the burn-scar image shown up top). The area of the infrared pixel used to detect this fire is about twice the size of the area consumed; you might conclude that very little of the pixel at any one time was burning, and the detection of a fire of this small size is remarkable.

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High winds prevent a Hawaiian Airlines flight to Pago Pago from landing

On 20 February 2025, high winds at Pago Pago International Airport (located at 14.3oS, 170.7oW) meant Hawaiian Airlines Flight 465 (an A330 with 160 passengers on board) was forced to return to Honolulu (News Article; FlightAware screenshot) without its scheduled landing in Pago Pago. American Samoa at the time was within the... Read More

On 20 February 2025, high winds at Pago Pago International Airport (located at 14.3oS, 170.7oW) meant Hawaiian Airlines Flight 465 (an A330 with 160 passengers on board) was forced to return to Honolulu (News Article; FlightAware screenshot) without its scheduled landing in Pago Pago. American Samoa at the time was within the South Pacific Convergence Zone, and both flood and high wind warnings (issued by the National Weather Service office at the airport) were in place (Here is the High Wind Warning Text, and here is the Forecast Discussion valid at that time). What did satellite imagery show during this time?

MIMIC TPW Fields over the south Pacific, 0000 UTC 20 February – 0000 UTC 22 February 2025 (Click to enlarge)

The animation above shows MIMIC TPW estimates of Total Precipitable Water derived from Microwave sounders. The abundant moisture of the SPCZ is shown are red/dark purple over Samoa. February saw 25″ of rain fall in Pago Pago.

CIMSS Turbulence (online here, with a training video available) shows fields created via machine-learning algorithms that are trained on aircraft observations of Eddy Dissipation Rate (EDR, i.e., turbulence), and the fields displayed below show probability of Moderate-or-Greater (MOG) turbulence. The animation shows MOG fields from GOES-West from 0000-0930 UTC on 21 February 2025 (HA465 typically lands at 9 PM Samoa Standard Time, which is 0800 UTC on the following day). As noted above, Pago Pago is near 14oS, 171oW, near the center of the box drawn on the image. The satellite imagery and GFS model fields used to compute MOG Probability show large values around the Samoan Islands. This predicts upper-level turbulence, not the turbulence that might be occurring closer to the surface.

Contours of GOES-18 MOG CIMSS Turbulence Probability, 0000 – 0930 UTC on 21 February 2025 (Click to enlarge) ; the box is centered near American Samoa

JMA‘s Himawari-9 also views American Samoa. CIMSS Turbulence fields computed using data from that satellite, below, tell a similar tale.

Contours of Himawari-9 MOG CIMSS Turbulence Probability, 0000 – 0930 UTC on 21 February 2025 (Click to enlarge) ; the box is centered near American Samoa

GOES-18 Clean Window infrared imagery, below, shows widespread convection associated with the SPCZ over the Samoan Islands. Clear-air Total Precipitable Water (TPW), a level-2 GOES-R Product shows little information because of the widespread cloudiness (this is when microwave-based TPW estimates, like MIMIC shown above, are most important) although values (showing very moist conditions) occasionally appear in breaks in the cloudiness.

GOES-18 clean window infrared (Band 13, 10.3 µm) brightness temperature plotted over clear-sky estimates of Total Precipitable Water, 0000-0930 UTC on 21 February 2025 (Click to enlarge)

Upper-level Water Vapor infrared imagery, below, similarly shows widespread convection over the Samoan Islands. You can also infer large scale upper-level divergence: Equator-ward motion over the northern part of the domain and poleward motion in the southern part of the domain.

GOES-18 upper-level water vapor infrared (Band 8, 6.2 µm) brightness temperature plotted over clear-sky estimates of Total Precipitable Water, 0000-0930 UTC on 21 February 2025 (Click to enlarge)

Soundings from Pago Pago (upper air station 91765, from here) on 20 and 21 February are shown below. The very moist airmass is noteable (60+ mm of Total Precipitable Water), and so are the strong winds: 40-50 knots below 800 mb!

Scatterometry on 20 and 21 February shown below (from the ‘manati’ website) show strong low-level winds over/around the islands.

ASCAT winds from Metop-B and Metop-C over the Samoan Islands, 20 and 21 February 2025 (Click to enlarge)

The SSEC/CIMSS Tropical Website includes wind analyses over the southeast Pacific. What did those show during this time? Low-level convergence and upper-level divergence, shown below, are consistent with the development of very strong convection within the moist atmosphere.

Low-level convergence over the southeast Pacific, 0000 – 0900 UTC on 21 February 2025 (Click to enlarge)
Upper-level divergence over the southeast Pacific, 0000 – 0900 UTC on 21 February 2025 (Click to enlarge)

Observed winds (observed by tracking cloud motions or water vapor gradients) at low levels show the broad convergence over the area, and broad swaths of low-level winds at 20-25 knots. Cloudiness over the Samoan Islands, however, prevented observations of derived motion winds there. Upper-level winds for the same time are concentrated over the cloudband that overlies the Samoan Islands. It’s pretty easy to see very strong diffluence over Samoa.

Derived Motion Winds over the southeast Pacific, 0000 – 0900 UTC on 21 February 2025 (Click to enlarge)

Deep-layer mean flow on 20-21 February 2025 was towards the east-southeast. Convective development was moving in that direction during the 36h shown in the animation (Click here to see an animation of 850-mb vorticity).

Deep-layer (250-850 mb) mean flow, 0000 UTC 20 February – 1200 UTC 21 February 2025 (Click to enlarge)

Shear values, shown below for 0000 and 1200 UTC on 21 February, suggest a favorable environment for Tropical Cyclone spin-up is present just south of the Samoan Islands.

Wind Shear (850-250 mb), 0000 – 1200 UTC on 21 February 2025 (Click to enlarge)

What do all these fields mean put together? Are they enough to cancel the flight at the outset? Not really (in my opinion, not that anyone asked me back on the 20th), but they certainly support the presence of the strong winds at the airport that led to two landing attempts and forced the plane to return to its starting point.


What did LightningCast probabilities (as computed with the latest CSPP Geo software beta release) show? The animation below shows GOES-18 LightingCast probabilities at 10-minute timesteps from 0700 through 0830 UTC on 21 February 2025. Convection that will likely produce GLM Observations in the next 60 minutes is over Independent Samoa, but not over American Samoa.

LightningCast Probabilities over the Samoan Islands, 0700-0830 UTC on 21 February 2025 (Click to enlarge)

Values computed with Himawari-9 data, shown below at 0730 UTC on 21 February 2025, are very similar to those from GOES-18.

LightningCast Probabilities, 0730 UTC on 21 February 2025 from Himawari-9 data (left) and from GOES-West data (right) (click to enlarge)

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Satellite signatures of the Starship Test Flight 8 launch

In a sequence of daytime True Color RGB + Nighttime Microphysics RGB images from GOES-16 (GOES-East) and GOES-18 (GOES-West) (above), signatures of the SpaceX Starship Test Flight 8 launch were seen — the Super Heavy Stage 1 rocket booster condensation cloud cast a long shadow across the water before sunset,... Read More

True Color RGB + Nighttime Microphysics RGB images from GOES-16 and GOES-18 [click to play MP4 animation]

In a sequence of daytime True Color RGB + Nighttime Microphysics RGB images from GOES-16 (GOES-East) and GOES-18 (GOES-West) (above), signatures of the SpaceX Starship Test Flight 8 launch were seen — the Super Heavy Stage 1 rocket booster condensation cloud cast a long shadow across the water before sunset, as it became sheared by high-altitude winds over the Starbase launch site near the South Texas coast.

1-minute Mesoscale Domain Sector GOES-16 daytime True Color RGB + Nighttime Microphysics RGB images (source) are shown below.

1-minute GOES-16 daytime True Color RGB + Nighttime Microphysics RGB images [click to play MP4 animation]


16-panel display of all 16 ABI spectral bands from GOES-16, at 1-minute intervals from 2329-2337 UTC [click to play MP4 animation]

A 16-panel display of 1-minute GOES-16 images (above) showed reflectance or thermal signatures from all 16 ABI spectral bands. It is notable that a thermal signature of the Super Heavy Stage 1 rocket booster was apparent in Near-Infrared and Infrared spectral bands 04-16 at 2333 UTC — and at 2334 UTC in bands 08/09/10/16, thermal signatures of (1) the Starship Stage 2 rocket (just after separation from the Stage 1 booster) and (2) the boostback burn of the Stage 1 booster rocket as it began its return to the Starbase launch site.

A toggle between GOES-16 Upper-level Water Vapor (6.2 µm) and Shortwave Infrared (3.9 µm) images at 2336 UTC (below) showed thermal signatures of the Starship Stage 2 rocket as it was traveling east across the Gulf of Mexico. At that time the rocket had reached altitudes of 70-80 km (where air within the Mesosphere was much less dense, with low ambient pressure) — so the rocket exhaust plume was able to expand outward into more of a curved “boomerang” shape in the Water Vapor image.

Toggle between GOES-16 Upper-level Water Vapor (6.2 µm) and Shortwave Infrared (3.9 µm) images at 2336 UTC [click to enlarge]

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NGFS detection of a barrier island fire in Texas: GOES and VIIRS

CSPP Geosphere imagery on 5 March, above, (direct link to imagery), shows the development of a smoke plume from a fire at the north end of San Jose Island. When did the Next Generation Fire System first identify the fire that caused the smoke plume? The NGFS Alerts Dashboard, below, shows a detection... Read More

CSPP Geosphere imagery on 5 March, above, (direct link to imagery), shows the development of a smoke plume from a fire at the north end of San Jose Island. When did the Next Generation Fire System first identify the fire that caused the smoke plume? The NGFS Alerts Dashboard, below, shows a detection over Aransas County.

NGFS Alerts Dashboard at 1908 UTC on 5 March 2024 (Click to enlarge); note that only CONUS scanning is shown for the Aransas County detection because Mesosectors were viewing elsewhere

What did those CONUS (every five minute) detections show?The animation below shows NGFS Microphysics, Fire Temperature RGB and Band 7 (Shortwave infrared, 3.9 µm) imagery from GOES-16. The NGFS detection occurred at 1646 UTC. The fire develops quickly and the Fire Temperature RGB and Band 7 imagery show a very obvious fire signal by 1701 UTC.

GOES-16 NGFS Microphysics RGB (upper left), Google Map (upper right), GOES-16 Band 7 Shortwave Infrared (3.9 µm, lower left) and GOES-16 Fire Temperature RGB (lower right), 1636-1701 UTC on 5 March 2025 (Click to enlarge)

NGFS detections also occur with VIIRS imagery that has much greater spatial resolution, as fine as 375m for some infrared (and visible) channels. The NOAA-21 overpass shows a smoke plume in the GeoColor imagery below, and three separate fire detections in these Real Earth screenshots (from here).

NOAA-21 NGFS Fire Detections superimposed on GeoColor imagery, 1922 UTC on 5 March 2024 (Click to enlarge)

A zoomed-in view of the NGFS detections and the NGFS Microphysics is shown below. Of particular note is that VIIRS data resolves three separate fires.

VIIRS-based NGFS fire detections plotted on top of an NGFS Microphysics RGB, 1922 UTC on 5 March 2025 (Click to enlarge)

What did GOES show at the same time? That’s shown below in a toggle between GeoColor and the NGFS Microphysics RGB. The advantages of the higher-resolution VIIRS imagery shown above is obvious. VIIRS coverage is somewhat limited over CONUS; it is much more plentiful over Alaska where GOES pixel sizes have become large because of the distance to Alaska from the sub-satellite point of GOES-18.

GOES-16 GeoColor and NGFS MIcrophysics, 1921 UTC on 5 March 2025 (Click to enlarge)

This detection on 5 March was over a relatively uninhabited region, where satellite detection will likely give the earliest alert for responders. On 4 March, when much of south Texas was within a critical fire weather outlook from SPC, a fire developed within the pixels that included at the NWS Corpus Christi office! The NGFS detections for that (brief) grassland fire are shown below.

NGFS MIcrophysics and Fire Detections near Corpus Christi TX, 2151 – 2236 UTC on 4 March 2025 (Click to enlarge)

This example on 4 March demonstrates why it’s important for a weather office to have windows!

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