In 2014, three major governmental organizations that are Korea Meteorological Administration (KMA), K-water,
and Korea Rural Community Corporation have been established the Hydrometeorological Cooperation Center
(HCC) to accomplish more effective water management for scarcely gauged river basins, where data are uncertain
or non-consistent. To manage the optimal drought and flood control over the ungauged river, HCC aims to
interconnect between weather observations and forecasting information, and hydrological model over sparse regions
with limited observations sites in Korean peninsula. In this study, long-term forecasting ensemble models so
called Global Seasonal forecast system version 5 (GloSea5): a high-resolution seasonal forecast system, provided
by KMA was used in order to produce drought outlook. Glosea5 ensemble model prediction provides predicted
drought information for 1 and 3 months ahead with drought index including Standardized Precipitation Index
(SPI3) and Palmer Drought Severity Index (PDSI). Also, Global Precipitation Measurement and Global Climate
Observation Measurement - Water1 satellites data products are used to estimate rainfall and soil moisture contents
over the ungauged region.