Radar imagery over the island of Hawai’i, below, from 512 – 639 AM HST shows the development of strong thunderstorms over/near Kona. Note that 512 AM HST is 1512 UTC; 639 AM HST is 1639 UTC. The heavy rains led to the issuance of a Flash Flood Warning (link). What... Read More

The Joint Typhoon Warning Center has issued a Tropical Cyclone Formation Advisory (TCFA) for disturbed weather located southwest of Chuuk in the tropical Pacific. MIMIC Total Precipitable Water fields, above, show the development of a circulation near 150oE Longitude and 5oN Latitude between 0000 UTC 17 May and 0000 UTC 19 May. At present the system... Read More

Visible imagery from near sunset on 16 May 2023, above, shows multiple horizontal cloud lines north of the islands of Oahu and Kauai. Each of the clouds lines is associated with a local modulation of the wind field in the SAR Wind field. The wind /Normalized Radar Cross Section fields are also available online... Read More

Southern Wisconsin experienced the convergence of 3 cooling mechanisms during the afternoon hours of 16 May 2023: (1) the arrival of a dense band of smoke aloft — transported southward from wildfires in Alberta and Saskatchewan — which reduced incoming solar radiation, (2) a southward-moving cold front and (3) the inland surge... Read More