User:OhHaiMark/1980 Pacific typhoon season

The 1980 Pacific typhoon season was a slightly-below average season compared to the long-term average, featuring at least six systems.

The scope of this article is limited to the Pacific Ocean to the north of the equator between 100°E and 180th meridian. Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones which can often result in a cyclone having two names. Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center (JTWC) are given a number with a "W" suffix. Additionally, the JTWC, at the time, took most of the responsibility in the basin, including naming the storms. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assigns names to tropical cyclones which move into or form as a tropical depression in the Philippine Area of Responsibility (PAR), located between 135°E and 115°E and between 5°N–25°N, regardless of whether or not a tropical cyclone has already been given a name by the JTWC.

Seasonal summary
Thie 1980 Pacific typhoon season's ACE index was approximately 237.8 units, This number represents sum of the squares of the maximum sustained wind speed (knots) for all named storms while they are at least tropical storm intensity, divided by 10,000. Therefore, tropical depressions are not included.

Tropical Depression 01W (Biring)
On 16 March, the Joint Typhoon Warning Center (JTWC) began tracking an area of increased convective activity around 500 nmi south-southeast of Guam, which had formed due to a short-lived extension of the equatorial trough into the Northern Hemisphere. After aircraft reconnaissance alongside satellite imagery revealed that the disturbance's outflow was improving, on 18 March, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the system. Two days later, the disturbance developed into a depression, tracking west-northwestward towards Luzon. Soon after, the depression crossed into the Philippine Area of Responsibility (PAR), causing the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) to name it Biring. Persistent wind shear prevented the depression from intensifying further, and after making landfall in the Philippines on 24 March, it degenerated into a remnant low. Despite that, PAGASA kept tracking the remnants until 27 March.

Across the Philippines, 4 people died due to the depression. The Naval Oceanography Command Center (NAVOCEANCOMCEN) issued an extratropical warning for the seas in the vicinity of Taiwan due to the combined effects of the depression and a high-pressure ridge intensifying in mainland Asia.

Tropical Storm Carmen
On 2 April, the JTWC began tracking a tropical disturbance located east of the International Date Line. At the time, the disturbance was developing alongside a parallel cyclone, the precursor to Cyclone Wally, inside the near-equatorial trough. Steadily tracking west, later that day, Carmen intensified into a tropical storm. A few hours later, as the system crossed east of the Date Line on 5 April, the JTWC issued their first warning on the system. Later that day, the JMA designated the system as a tropical storm, with the JTWC following suit a few hours later, naming it Carmen. Steadily intensifying, the next day, both the JTWC and JMA stated that Carmen peaked with sustained winds of 60 knot. Soon after, Carmen steadily weakened, and after tracking east of the Date Line on 7 April, the JTWC stopped tracking the system.

Typhoon Dom (Ditang)
On 5 May, using satellite imagery, the JTWC began tracking a weak tropical disturbance in the near-equatorial trough. As it tracked westward across the Caroline Islands in the following three days, little development was seen. Despite that, on May 7, the Japan Meteorological Agency designated the disturbance as a tropical depression. The next day, an uptick in convective activity prompted the JTWC to issue a TCFA on the system, which was south of Guam. As the circulation steadily organized, the JTWC upgraded the system into a tropical depression. Two days later, the depression crossed into the PAR, causing PAGASA to name it Ditang. Despite intense vertical shear, the depression intensified into a tropical storm a few hours later, being named Dom by the JTWC. After the wind shear relaxed, on May 11, the JTWC stated that Dom had intensified into a typhoon, with the JMA following suit the next day. Soon after, Dom began weakening due to the mountainous terrain of Luzon, becoming a tropical storm on May 14. However, as Dom traced eastward, the next day, it re-intensified into a typhoon.

After this secondary peak, a combination of colder SSTs and unfavorable atmospheric conditions caused the system to steadily weaken, and after doing an anticyclonic loop, on May 18, Dom weakened into a tropical storm. The next day, the JTWC issued their last advisory on Dom, declaring that it had degenerated into a post-tropical cyclone. PAGASA kept tracking the system until May 21, when the remnants of Dom and a weakening Ellen began accelerating towards an extratropical cyclone south of Japan. The remnants of Dom and Ellen later merged with the cyclone the same day, causing the JMA to finally stop monitoring the former cyclone a few hours later.

In the Philippines, Ditang resulted in 3,696 homes being damaged.

Other systems

 * PAGASA tracked a tropical cyclone from February 12 – 14, naming it Asiang.
 * PAGASA tracked a tropical cyclone from April 28 – May 1, naming it Konsing.
 * On June 28, a tropical depression formed east of the Philippines. Two days later, PAGASA began tracking the disturbance, naming it Isang. After it made two landfalls in the Philippines, PAGASA stopped tracking the depression on July 2. The depression dissipated the next day.

Season effects

 * Asiang || February 12 – 14 || style="background:#" |Tropical depression || style="background:#" | Unknown || style="background:#" | Unknown || Unknown || Unknown || Unknown ||
 * 01W (Biring) || March 20 – 24 || style="background:#" |Tropical depression || style="background:#" | 30 kn || style="background:#" |1000 hPa || Philippines, Vietnam ||$346 thousand||4||
 * Carmen || April 5 – 7 || style="background:#" |Tropical storm || style="background:#" | 60 kn || style="background:#" | 980 hPa || None ||None||None||
 * Konsing || April 28 – May 1 || style="background:#" |Tropical depression || style="background:#" | Unknown || style="background:#" | Unknown || Unknown||Unknown||Unknown||
 * Dom (Ditang) || May 8 – 19 || style="background:#" |Typhoon || style="background:#" | 90 kn || style="background:#" |956 hPa || Caroline Islands, Philippines ||$320 thousand||None||
 * Isang || June 28 – July 3 || style="background:#" |Tropical depression || style="background:#" | 30 kn || style="background:#" |998 hPa||Philippines||Unknown||Unknown||
 * Konsing || April 28 – May 1 || style="background:#" |Tropical depression || style="background:#" | Unknown || style="background:#" | Unknown || Unknown||Unknown||Unknown||
 * Dom (Ditang) || May 8 – 19 || style="background:#" |Typhoon || style="background:#" | 90 kn || style="background:#" |956 hPa || Caroline Islands, Philippines ||$320 thousand||None||
 * Isang || June 28 – July 3 || style="background:#" |Tropical depression || style="background:#" | 30 kn || style="background:#" |998 hPa||Philippines||Unknown||Unknown||
 * Dom (Ditang) || May 8 – 19 || style="background:#" |Typhoon || style="background:#" | 90 kn || style="background:#" |956 hPa || Caroline Islands, Philippines ||$320 thousand||None||
 * Isang || June 28 – July 3 || style="background:#" |Tropical depression || style="background:#" | 30 kn || style="background:#" |998 hPa||Philippines||Unknown||Unknown||
 * Isang || June 28 – July 3 || style="background:#" |Tropical depression || style="background:#" | 30 kn || style="background:#" |998 hPa||Philippines||Unknown||Unknown||