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Tropical Storm Cristobal Forecast Discussion Number 26
2020-06-08 04:50:43| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Sun Jun 07 2020 000 WTNT43 KNHC 080250 TCDAT3 Tropical Storm Cristobal Discussion Number 26 NWS National Hurricane Center Miami FL AL032020 1000 PM CDT Sun Jun 07 2020 Earlier satellite, radar, and surface observations showed that the center of Cristobal made landfall in southeastern Louisiana around 2200 UTC. Since that time, the storm has turned north- northwestward with the center passing very near New Orleans. Recent Doppler radar data and surface observations suggest that the maximum winds have begun to decrease, and the advisory intensity is set to 40 kt. These winds are primarily occurring over the northern Gulf of Mexico waters. The initial motion estimate is 345/9 kt. Cristobal should continue north-northwestward overnight as a high pressure ridge over the Great Lakes slides eastward. The cyclone is expected to turn northward by Monday night, and then northeastward on Tuesday ahead of a mid-latitude trough moving into the central United States. A faster northeastward motion should bring the center of the cyclone across the Upper Midwest on Tuesday and into Canada on Wednesday. After that time, the system is expected to slow down after it completes its extratropical transition. The early portion of the new NHC track forecast has been adjusted slightly eastward based on the more northward and eastward initial position, however the remainder of the track forecast is very close to the previous advisory and the various consensus aids. Gradual weakening should occur overnight as the circulation continues to move over land, and Cristobal is forecast to become a tropical depression Monday morning. Additional gradual weakening is anticipated while the cyclone moves over the central U.S. through Tuesday, but some slight re-strengthening is possible due to strong baroclinic forcing during the extratropical transition around midweek. The NHC intensity forecast is primarily a blend of the global models. As the system completes its extratropical transition, strong gusty winds are possible mid week behind an associated front over portions of the Midwest and Great Lakes regions. Although Cristobal has begun weakening, tropical-storm-force winds and life-threatening storm surge is expected to continue over a portion of the northern Gulf coast overnight. Heavy rains associated with the system will also spread over portions of the central United States over the next couple of days. Key Messages: 1. There is a danger of life-threatening storm surge outside of the Hurricane and Storm Damage Risk Reduction System from the Mouth of the Mississippi River to Ocean Springs, Mississippi, and a Storm Surge Warning is in effect for those areas. Residents in these locations should follow advice given by local emergency officials. 2. Tropical-storm-force winds will continue along portions of the northern Gulf coast from central Louisiana to the western Florida Panhandle, including metropolitan New Orleans through the overnight hours, and a Tropical Storm Warning is in effect for this area. 3. Heavy rainfall across north Florida should diminish overnight. Heavy rain will continue to push inland across the central Gulf coast and into the Lower Mississippi Valley Sunday night. The Central Gulf Coast region will be most prone to heavy rain issues after the passage of the center of Cristobal through Monday. This heavy rain will move up the Lower and Mid Mississippi Valley Monday into Tuesday, then across the Upper Mississippi Valley and Northern Plains Tuesday and Tuesday night. Flash flooding, and new and renewed significant river flooding is possible, especially where heavier rainfall occurs over portions of the Gulf Coast through the Mississippi Valley. FORECAST POSITIONS AND MAX WINDS INIT 08/0300Z 30.3N 90.2W 40 KT 45 MPH 12H 08/1200Z 32.0N 91.1W 30 KT 35 MPH...INLAND 24H 09/0000Z 34.6N 91.9W 25 KT 30 MPH...INLAND 36H 09/1200Z 38.1N 91.3W 25 KT 30 MPH...INLAND 48H 10/0000Z 42.9N 89.2W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 10/1200Z 47.5N 86.7W 30 KT 35 MPH...POST-TROP/EXTRATROP 72H 11/0000Z 50.8N 83.5W 35 KT 40 MPH...POST-TROP/EXTRATROP 96H 12/0000Z 52.8N 79.0W 35 KT 40 MPH...POST-TROP/EXTRATROP 120H 13/0000Z...DISSIPATED $$ Forecaster Brown
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