On March 9, the
Fiji Meteorological Service (FMS) reported that Tropical Disturbance 14F had developed about to the northwest of
Pago Pago in
American Samoa. Over the next day, the system moved north-westwards in a marginal environment for further development with weak vertical windshear, while
atmospheric convection consolidated around a developing low-level circulation center. As a result, the FMS classified the system as a tropical depression before the United States
Joint Typhoon Warning Center issued a
tropical cyclone formation alert on the system. Located within an environment characterized by low wind shear, further intensification was anticipated as convection continued to develop over the expanding system. Around 1500 UTC on March 11, the JTWC issued their first advisory on the cyclone, classifying it as Tropical Storm 19P. Several hours later, the FMS upgraded the system to a Category 1 cyclone and gave it the name
Tomas. Rapid intensification was expected to take place over the following 48 hours as
sea surface temperatures ahead of the storm averaged , well-above the threshold for tropical cyclone development. Throughout the day on March 12, Tomas steadily intensified, and early the next day, the JTWC upgraded the storm to a Category 1 equivalent hurricane with winds of .
Convective banding substantially increased on March 13, allowing Tomas to become the fourth severe tropical cyclone of the season early the next morning. Around the same time, the JTWC assessed the storm to have attained winds of , ranking it as a Category 2 cyclone. The JTWC also noted further intensification, upgrading Tomas to a Category 3 equivalent storm. As it passed near
Vanua Levu on March 15, the cyclone attained its peak intensity with winds of and a pressure of 930 hPa (mbar) according to the FMS. At the same time, the
Joint Typhoon Warning Center assessed it as a
Category 4 equivalent storm with 1-minute sustained winds of . On March 16, Tomas moved out of FMS's area of responsibility, who passed the primary warning responsibility for Tomas to New Zealand's MetService. Tomas extratropical remnants were last noted on March 20, after they had moved across 120°W and out of MetService's area of responsibility. ==Impact==