Extreme Weather News

Tropical Cyclone Nora's Flooding Rains Measured With IMERG

Tropical Cyclone NORA produced heavy rainfall when it came ashore in northwestern Queensland on March 24, 2018 (GMT). NORA's peak intensity of 95 kts (109 mph) was reached when the tropical cyclone was located in the central northern Gulf Of Carpentaria. Winds had decreased slightly to 90 kts (104 mph) by landfall. The Australian Bureau of Meteorology (BOM) reported that NORA produced over 110 mm (4.3 inches) of rain in 24 hours. Flooding, landslides, lost electrical power, and structural damage were also a companion of the tropical cyclone's arrival. After landfall NORA weakened but the remnants continued to produce heavy precipitation. NORA was no longer a significant tropical cyclone after March 25 at 1200 UTC. Australia's BOM rainfall analyses indicate that over 200 mm (7.9 inches) of rain accompanied tropical tropical cyclone NORA in parts of northwestern Queensland.

Tropical Cyclone Nora's Flooding Rains Measured With IMERG

This rainfall accumulation analysis was derived from NASA's Integrated Multi-satellitE Retrievals data (IMERG). IMERG data were used to calculate estimates of precipitation totals from a combination of space-borne passive microwave sensors, including the GMI microwave sensor on the GPM satellite, and geostationary IR (infrared) data. NASA's Precipitation Measurement Missions (PMM) science team has developed algorithms that support GPM Missions such a IMERG. This analysis shows an estimate of IMERG rainfall accumulation totals during the period from March 22-26, 2018. Tropical cyclone NORA formed, traveled over the Gulf Of Carpentaria and dissipated over northwestern Queensland during that period. This IMERG analysis indicates that the heaviest precipitation with NORA occurred over the Gulf Of Carpentaria where over 433 mm (17 inches) of rain fell. More than 260 mm (10.2 inches) of rain was indicated by IMERG along NORA's track into northwestern Queensland.

Tropical Cyclone Nora's Flooding Rains Measured With IMERG

  • Images and caption by Hal Pierce (SSAI/NASA GSFC)