1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible images (above) and Infrared Window images (below) showed the development of supercell thunderstorms in parts of southern Saskatchewan and southern Manitoba on 06 June 2026. GOES-19 GLM Flash Points highlighted the abundant lightning activity that was associated with these thunderstorms. The supercell thunderstorms developed in the vicinity of a cold frontal boundary — and produced hail as large as 2″ in diameter, and also prompted the issuance of tornado warnings in both Manitoba and Saskatchewan.

A toggle between GOES-19 Visible and Infrared Window images at 2145 UTC (below) included a cursor sample of the coldest cloud-top infrared brightness temperature of the Manitoba thunderstorm, wich was -68.18C.

A toggle between GOES-19 Visible and Infrared Window images at 2335 UTC (below) included a cursor sample of the coldest cloud-top infrared brightness temperature for the Saskatchewan thunderstorm, which was -68.67C.

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A moderate intensity solar flare was detected by the SUVI on GOES-18 (GOES-West), which peaked at 0136 UTC on 03 June 2026 (above). These SUVI images were sourced from the SSEC Geostationary Satellite Imagery site.

The Space Weather Prediction Center classified this solar flare as M9.3 intensity (below).

Later on 03 June, a second solar flare was evident in GOES-19 (GOES-East) SUVI (below).

Finally, a few hours later on 03 June a third solar flare directed a Coronal Mass Ejection (CME) off the northeastern limb of the Sun, as viewed by the GOES-19 SUVI (below).

As a result of these three CMEs, a G3 Geomagnetic Storm Watch was issued (below).

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5-minute CONUS Sector GOES-18 (GOES-West) Nighttime Microphysics RGB + daytime True Color RGB images from the CSPP GeoSphere site (above) revealed a curious cloud arc located southeast of the Big Island of Hawai`i (near 150 W longitude) on 30 May 2026. The fact that the typical westward transport of marine boundary layer stratocumulus clouds seemed to abruptly halt to the west of that cloud arc caused this blog post author to immediately wonder “What the heck is this?” — and assign it to the aptly-named “What the heck is this?” blog category of seemingly unexplainable meteorological phenomena.

GOES-18 Infrared Window images (above) and Visible images (below) included plots of surface analyses every 6 hours — which depicted a broad inverted trough over the area, although the position and orientation/shape of the analyzed trough axis did not match that of the actual cloud arc feature (those tropical surface analyses were produced by multiple collaborating agencies; surface analyses from NWS Honolulu also showed a trough axis near 150 W longitude).

In a toggle between GOES-18 Visible, Infrared Window and Cloud Top Height images at 1801 UTC (above), the infrared brightness temperatures of the leading edge of the cloud arc were around +8 to +10C, with Cloud Top Height values generally in the 9500-10000 ft range. According to a plot of 1200 UTC rawinsonde data from Hilo (below), those cloud temperature and height values were near the base of the trade wind inversion.

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A CONUS Sector GOES-19 (GOES-East) Visible image with overlays of 1-minute GLM Flash Extent Density and GLM Flash Points (above) showed the signature of a high-altitude bolide that was entering the Earth’s mesosphere over far eastern Massachusetts at 1807 UTC on 30 May 2026. This bolide created a sonic boom that was heard in several communities.

Cursor samples (below) indicated that the maximum GLM Flash Extent Density values were 7 flashes/min (darker red pixels within the northern portion of the bolide signature), in addition to a flash duration of 0.024 sec with a flash area of 67 km².

 

A map of fireball reports from the American Meteor Society site (below) displayed the large area from which this daytime event was seen. A closer view indicated that the bolide likely traveled along a northwest-to-southeast trajectory.

#MeteorSighting: Eyewitnesses in New England and @NOAA’s GOES-19 satellite reported a bright fireball on Saturday, May 30, at 2:06 p.m EDT accompanied by a loud noise. The meteor appears to have fragmented at an altitude of 40 miles over northeast MA and southeast NH. The energy…

— NASA Space Alerts (@NASASpaceAlerts) May 30, 2026

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