1961 revisions
Posted by Fred on 11/30/2019, 11:35 am
Hurricane Anna (changes noted starting on page 1)


Significant Revisions:
1. Genesis is indicated to have occurred 54 hours earlier, based upon satellite
and ship observations;
2. Intensity significantly boosted on the 20th based upon ship and aircraft
observations later in the day
3. Intensity significantly reduced on the 21st to the 23rd based upon aircraft
reconnaissance;
4. Peak intensity reduced from Category 3 (100 kt on the 21st to the 23rd) to
Category 2 (90 kt on the 22nd);

5. A few central pressures were added based upon aircraft reconnaissance
observations;
6. Intensity significantly reduced on the 24th to show a more realistic
weakening after landfall.


Hurricane Betsy (changes noted starting on page 10)

Substantial revisions:
1. Intensity significantly increased on the 2nd and 3rd based upon ship and
aircraft observations; (65kts to 90kts)
2. Intensity significantly reduced on the 4th and 5th based upon aircraft
observations; (100kts to 75kts on 4th)
3. A few central pressures were removed, as these values were not based on
observations;
4. Transition to extratropical 24 hours earlier;
5. Large west-southwestward adjustment in the position on the 12th based upon
ship and coastal observations;
6. Four days added to its lifetime as an extratropical cyclone.


Hurricane Carla (changes noted starting on page 21)


Significant Revisions:
1. Transition to a tropical storm is indicated to be 18 hours earlier;
2. Intensity significantly reduced on the 11th based upon aircraft
observations;
3. Peak intensity on the 11th reduced from 150 kt to 125 kt;
4. Position adjusted significantly northeastward on the 13th based upon
surface observations;
5. Significant eastward adjustment to the position was added at 00Z on
the 15th based on station observations;
6. Numerous central pressures were added during the extratropical phase
based upon station observations;
7. The lifetime of the system is extended two days as an extratropical
cyclone.


Hurricane Debbie (changes noted starting on page 34)

Significant Revisions:
1. Genesis indicated 18 hours earlier based upon ship and coastal observations;
2. Intensity substantially decreased on the 11th to the 13th based upon aircraft
observations;
3. Peak intensity on 11th and 12th reduced from 105 kt to 80 kt;
4. Extratropical transition introduced with ET stage on the 15th through the
18th;
5. Two additional days as an extratropical cyclone are added based upon ship
and coastal observations.


Hurricane Esther (changes noted starting on page 42)


Significant Revisions:
1. Intensity substantially raised on the 11th based upon aircraft reconnaissance
observations;
2. Intensity substantially reduced on the 12th through early on the 16th based
upon aircraft reconnaissance observations;
3. Several central pressures were added or substantially adjusted based upon
aircraft reconnaissance;
4. Several central pressures are removed, as they were likely analyses and not
based upon observations;
5. Intensity substantially boosted from late on the 16th to early on the 18th
based upon aircraft reconnaissance observations; Peak intensity now
considered to be 140 kt on the 17th, was previously 125 kt on the 18th and
19th;

6. Intensity substantially reduced late on the 18th to the 21st based upon
aircraft reconnaissance observations;
7. Intensity substantially increased on the 22nd based upon aircraft
reconnaissance observations;
8. Intensity substantially reduced late on the 23rd based upon ship and coastal
observations;
9. Intensity substantially increased on the 26th based upon ship and coastal
observations.


Unnamed Tropical Storm (changes noted starting on page 59)

Significant Revisions:
1. Intensity boosted upward substantially on the 15th based upon ship and
coastal observations;
2. Peak intensity raised from 35 kt to 55 kt as a tropical cyclone (60 kt
intensity as an extratropical cyclone);

3. A few central pressures added based upon ship and coastal observations;
4. An extratropical cyclone phase added on the 15th before dissipation.


Hurricane Frances (changes noted starting n pages 63)

Significant Revisions:
1. A few central pressures removed, as they are likely analyses and not based
upon observations;
2. Intensity substantially reduced on the 8th for a more realistic weakening
trend;
3. Extratropical transition indicated to be 18 hours earlier.



Tropical Storm Gerda (changes noted started on page 73)

Significant Revisions:
1. Genesis is begun 24 hours later than HURDAT, as the system did not have a
center until the 17th;
2. Several central pressures were added primarily from aircraft reconnaissance
and station observations;
3. Intensification to a tropical storm at 06Z on the 18th is indicated to have
occurred 30 hours earlier than HURDAT
4. Substantial intensity increase indicated on the 19th based upon aircraft
reconnaissance;
5. Substantial south-southwestward adjustment of the track on the 19th based
upon aircraft reconnaissance;
6. Substantial westward adjustment of the track on the 21st and 22nd based upon
coastal and ship observvations;
7. Substantial increase in the intensity (while extratropical) on the 21st based
upon coastal and ship observations.




Hurricane Hattie (changes noted starting on page 80)


Significant Revisions:
1. Genesis indicated to be 30 hours earlier based upon ship and coastal
observations;
2. Several central pressures were added, primarily based upon aircraft
reconnaissance;
3. Large downward revisions made to the intensity to some time periods on the
28th and 30th based primarily upon aircraft observations;
4. Large upward revision to the intensity made late on the 31st based upon ship
observations;
5. Large downward revision made to the intensity on the 1st based primarily upon
the Kaplan-DeMaria inland wind decay model;
6. Related change to the NE Pacific HURDAT: Removal of Tropical Storm Simone
from HURDAT.


Hurricane Jenny (changes noted starting on page 91)



Significant Revisions:
1. Genesis delayed by 12 hours based upon ship and coastal observations;
2. Intensity significantly boosted on the 5th based on ship observations;
3. Transition to extratropical delayed by two days based upon ship
observations;
4. Dissipation delayed by 36 hours based upon ship observations.



Tropical Storm Inga (changes noted starting on page 98)

Significant Revisions:
1. Genesis begun a day earlier based upon ship and coastal observations;
2. Intensity rasied significantly on the 5th based upon aircraft observations(45kts to 60kts);
3. A few central pressures were added based primarly upon aircraft obsevations.








49
In this thread:
official reanalysis of the 1961-65 seasons - Fred, 11/30/2019, 10:30 am
< Return to the front page of the: message board | monthly archive this page is in
Post A Reply
This thread has been archived and can no longer receive replies.