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Tropical Storm Frank Discussion Number 29
NWS National Hurricane Center Miami FL EP072022
200 AM PDT Tue Aug 02 2022
Only a tiny region of -45 to -50 degree Celsius cloud top
temperatures remain with Frank southeast of its center this morning.
In fact, the tropical cyclone appears well on its way to becoming a
low-level cloud swirl devoid of any remaining deep convection.
Subjective and objective Dvorak classifications range from 30-kt to
45-kt this morning. Absent of any recent scatterometer data, but
noting that the passes yesterday afternoon had a large region of
greater than 40 kt winds, the initial intensity was held at 40-kt
this advisory. Frank should continue to gradually spin down over
20-22 C ocean waters as it moves further into a more stable
environment. The meager amount of cold cloud tops near Frank now
already do not meet the necessary criteria of a tropical cyclone,
and it is likely the storm will become post-tropical later today.
Most of the guidance now suggests Frank will open up into a trough
by 72 hours, and that is reflected in the latest forecast, showing
the remnant low dissipating about 300 n mi west of the California
coast.
Frank is still moving to the northwest at 310/9 kt. Even as Frank
becomes more shallow, the low-level steering flow will still enable
Frank to recurve between a narrow low-level ridge off of the Baja
California peninsula and a prominent deep-layer trough well west of
California. The track guidance remains tightly clustered, and only
slight changes were needed for the latest track forecast.
FORECAST POSITIONS AND MAX WINDS
INIT 02/0900Z 24.0N 124.7W 40 KT 45 MPH
12H 02/1800Z 25.2N 125.8W 35 KT 40 MPH...POST-TROPICAL
24H 03/0600Z 27.0N 126.9W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 03/1800Z 28.9N 127.4W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 04/0600Z 31.0N 127.4W 25 KT 30 MPH...POST-TROP/REMNT LOW
60H 04/1800Z 32.8N 126.8W 20 KT 25 MPH...POST-TROP/REMNT LOW
72H 05/0600Z...DISSIPATED
$$
Forecaster Papin
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