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老農民版夜神月|2021-8-30 10:54
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由於路徑較預期的偏東,更為深入陸地,減弱的速度因此較預期的快上不少,03Z只剩下TS下限35KT
000
WTPZ44 KNHC 300241
TCDEP4
Tropical Storm Nora Discussion Number 18
NWS National Hurricane Center Miami FL EP142021
900 PM MDT Sun Aug 29 2021
Nora appears to have moved inland, and it is unclear if it still has
a well-defined surface center. Earlier microwave data was
inconclusive regarding the existence of the low level center, while
the Dvorak analysts from TAFB and SAB were each unable to fix Nora's
center over water. The intensity has been lowered to 35 kt, assuming
weakening has occurred due to continued interaction with land.
Baring an unexpected redevelopment of the center over water, Nora
should continue to weaken inland, and could dissipate as soon as
early Monday. Quick dissipation is now supported by all of the
dynamical guidance. Accordingly, the NHC intensity forecast has
been adjusted much lower than in the previous advisory. Nora
is forecast to become post-tropical tomorrow and dissipate by
Tuesday. Based on recent trends, this forecast is probably generous.
Despite the uncertainty associated with Nora's position, the system
still appears to be moving generally north-northwestward, with an
initial motion of 330/10 kt. None of the dynamical guidance is able
to track a low-level center more than about 24 h. However,there is
good agreement that the mid-level remnants of Nora will continue
moving generally northwestward and could contribute to heavy rain
across northwest Mexico and portions of the southwestern U.S. during
the middle to latter portion of the week.
Key Messages:
1. Heavy rain associated with Nora is expected across the west
coast of Mexico from the states of Nayarit northward to southern
Sonora. This rain will likely result in life-threatening flash
flooding and mudslides across these regions. Rainfall from Nora is
likely to spread into the southwestern U.S. and central Rockies
during the middle to latter portion of the week, bringing the
potential for flash flooding to the region
FORECAST POSITIONS AND MAX WINDS
INIT 30/0300Z 24.8N 107.9W 35 KT 40 MPH
12H 30/1200Z 25.4N 108.4W 35 KT 40 MPH...INLAND
24H 31/0000Z 26.3N 109.1W 30 KT 35 MPH...POST-TROP/INLAND
36H 31/1200Z 27.0N 109.6W 25 KT 30 MPH...POST-TROP/INLAND
48H 01/0000Z...DISSIPATED
$$
Forecaster D. Zelinsky |
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