A strengthening Tropical Storm Harvey approached Texas Gulf coast on 24 August 2017. Harvey initially developed and was named on 17 August in the Atlantic just east of the Lesser Antilles. A couple days later, Harvey weakened to a wave before crossing over the Yucatan Peninsula . After advancing into the Gulf of Mexico on 22 Aug, Harvey strengthened again to a Tropical Storm. On 24 Aug, Harvey is forecast to become a Major Hurricane before making landfall early 26 Aug. Widespread rainfall of 15+” is forecast with this storm as it is not expected to move much after making landfall.
A GOES-16 1-min mesoscale sector was consistently available over Harvey during its life cycle. For tropical cyclones, 1-min imagery has proven to aid in identifying a center of circulation and in tracking thunderstorm evolution.
On 24 August, 30-second imagery (two overlapping 1-min sectors) was requested to track Harvey, providing a rare look at a strengthening tropical system. In Figure 1, a linear, compressed color map is used to capture storm top features.
30-sec imagery continued over Harvey during the morning of the 25th as the storm continued to strengthen nearing the Texas Gulf Coast.
Harvey made landfall Friday night as a category 4 hurricane.
Saturday morning, Harvey had weakened to a category 1 hurricane, continuing to produce strong winds and heavy rain across a large swath of Texas.
By Monday morning, Harvey had not moved much, still dropping heavy rainfall over southeast Texas and now western Louisiana. The GOES-16 IR animation in Figure 5 depicts the hourly evolution of Harvey from 8/22 when it redeveloped in the Gulf to 8/28.
On Tuesday, the storm had shifted east, producing heavy rain over the Louisiana/Texas border.
By Thursday, Harvey had weakened to a depression, and continued to slowly shift east into the ArkLaMiss region. The storm maintained its heavy rain threat (WPC high risk) and a tornado risk (SPC slight risk). By early afternoon, a tornado watch and several tornado warnings were in effect from N MS to SW TN. GOES-16 1-min sectors continued to follow the threats associated with Harvey (Fig 6).
-Bill Line, NWS
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