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Azores #96L fails to complete transition into a Sub-Tropical Storm. Elsewhere, weak low pressure in Caribbean may linger into next week.
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Archives >> 2012 News Talkbacks

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doug
Weather Analyst


Reged: Mon
Posts: 943
Loc: parrish,fl 27.53N 82.44W
Re: Hurricane Sandy and the Northeastern US [Re: Ed Dunham]
      #94240 - Wed Oct 31 2012 11:43 AM

Thanks Ed! Your blog comment clarified the issue. Perhaps in the post seasonal review the matter can be cleared up. To me, and many others, it was a sheared tropical system that made landfall, and not a post tropical one.
Based on the official determination then, Irene remains the last land falling hurricane, correct?

--------------------
doug

Edited by doug (Wed Oct 31 2012 11:45 AM)


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Random Chaos
Weather Analyst


Reged: Sat
Posts: 1023
Loc: Maryland 38.98N 76.50W
Re: Hurricane Sandy and the Northeastern US [Re: doug]
      #94241 - Wed Oct 31 2012 06:30 PM

Quote:

Technical question: IF Sandy was declassified before the COC made land fall did a hurricane make land fall on the New Jersey shore last night?




Probably will be answered in the NHC end-of-season analysis.


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danielwAdministrator
Moderator


Reged: Wed
Posts: 3502
Loc: Hattiesburg,MS (31.3N 89.3W)
Re: Hurricane Sandy and the Northeastern US [Re: Random Chaos]
      #94242 - Thu Nov 01 2012 10:50 PM

Tropical or Post Tropical or extratropical Cyclone....

HURRICANE SANDY DISCUSSION NUMBER 30...CORRECTED
NWS National Hurricane Center MIAMI FL AL182012
500 PM EDT MON OCT 29 2012

THE CONVECTIVE STRUCTURE OF SANDY HAS DETERIORATED TODAY...EVEN AS
THE CENTRAL PRESSURE HAS CONTINUED TO SLOWLY FALL...SUGGESTING THAT
THE CONVECTION IS NO LONGER DRIVING THE BUS. THE INTENSIFICATION
OBSERVED THIS MORNING WAS ASSOCIATED WITH STRONG WINDS OCCURRING TO
THE SOUTHWEST OF THE CENTER...OUTSIDE OF THE CENTRAL CORE...AND WAS
ALMOST CERTAINLY DUE TO BAROCLINIC FORCING. IN ADDITION...AIRCRAFT
DATA INDICATE THAT THERE ARE STRONG TEMPERATURE CONTRASTS VERY NEAR
A MODEST RESIDUAL WARM CORE. WATER VAPOR IMAGERY INDICATES THAT
SANDY IS BECOMING ABSORBED WITHIN A LARGE MID-LATITUDE CYCLONIC
CIRCULATION. ALL OF THESE CONSIDERATIONS LEAD US TO CONCLUDE THAT
THE MOST APPROPRIATE CLASSIFICATION AT ADVISORY TIME IS
EXTRATROPICAL. HOWEVER...FOR CONTINUITY OF SERVICE NHC WILL
CONTINUE TO ISSUE ADVISORIES THROUGH LANDFALL. A POST-STORM
ANALYSIS WILL RE-EXAMINE THE TIMING OF extratropical TRANSITION.

Below are the last 3 Vortex messages for Hurricane Sandy.

URNT12 KNHC 292240 CCA
VORTEX DATA MESSAGE AL182012
A. 29/22:12:40Z
B. 38 deg 55 min N
074 deg 12 min W
C. 850 mb 909 m
D. 46 kt
E. 026 deg 82 nm
F. 093 deg 64 kt
G. 026 deg 85 nm
H. 947 mb
I. 11 C / 1524 m
J. 16 C / 1526 m
K. 15 C / NA
L. NA
M. NA
N. 12345 / 8
O. 0.02 / 0.05 nm
P. AF308 2418A SANDY OB 21 CCA
MAX FL WIND 88 KT S QUAD 20:27:30Z
MAX OUTBOUND FL WIND 75 KT E QUAD 22:27:00Z
MAX FL TEMP 22 C 030 / 23 NM FROM FL CNTR
COR FOR OUTBOUND WIND
Max Flt Level Temp 22C/ 72F~danielw
********************************************************

URNT12 KNHC 292315
VORTEX DATA MESSAGE AL182012
A. 29/23:08:10Z
B. 39 deg 12 min N
074 deg 18 min W
C. 850 mb 901 m
D. 54 kt
E. 079 deg 66 nm
F. 172 deg 70 kt
G. 079 deg 66 nm
H. 947 mb
I. 6 C / 1526 m
J. 15 C / 1527 m
K. 13 C / NA
L. NA
M. NA
N. 12345 / 8
O. 0.02 / 2 nm
P. AF308 2418A SANDY OB 25
MAX FL WIND 88 KT S QUAD 20:27:30Z
MAX FL TEMP 18 C 094 / 15 NM FROM FL CNTR
Max Flt Level Temp 18C/ 64F
****************************************************************

URNT12 KNHC 292355
VORTEX DATA MESSAGE AL182012
A. 29/23:35:40Z
B. 39 deg 18 min N
074 deg 26 min W
C. 850 mb 909 m
D. 56 kt
E. 067 deg 32 nm
F. 160 deg 61 kt
G. 071 deg 36 nm
H. 948 mb
I. 15 C / 1521 m
J. 15 C / 1525 m
K. 13 C / NA
L. NA
M. NA
N. 1345 / 8
O. 0.02 / 3 nm
P. AF308 2418A SANDY OB 27
MAX FL WIND 88 KT S QUAD 20:27:30Z
MAX FL TEMP 17 C 083 / 9 NM FROM FL CNTR
36 NM INBOUND LEG
Max Flt level Temp 17C/ 63F
**********************************************************
Max wind VORTEX and Minimum central pressure:
URNT12 KNHC 292128 CCA
VORTEX DATA MESSAGE AL182012
A. 29/19:17:00Z
B. 38 deg 29 min N
073 deg 45 min W
C. 850 mb 870 m
D. 59 kt
E. 348 deg 77 nm
F. 059 deg 101 kt
G. 348 deg 75 nm
H. 941 mb
I. 10 C / 1524 m
J. 19 C / 1527 m
K. 17 C / NA
L. NA
M. NA
N. 12345 / 8
O. 0.02 / 1 nm
P. AF308 2418A SANDY OB 10 CCA
MAX FL WIND 101 KT N QUAD 18:54:00Z
MAX OUTBOUND FL WIND 94 KT S QUAD 19:34:30Z
FIXED NEAR TIP OF CONVECTIVE FEATURE
COR FOR MAX OUTBOUND WIND
;
*************************************************************
Lowest pressure and maximum flight level wind, immediately prior to landfall, are found in Mission 24, Obs 10.
B. Center Fix Location: 71 miles (115 km) to the SSE (149°) from Atlantic City, NJ, USA
H. 941 mb
Eye temps are:
I. 10 C / 1524 m (50F air temp outside the Eye)
J. 19 C / 1527 m (66F air temp inside the Eye)
K. 17 C / NA (63F dew point inside the Eye)
**************************

Last Vortex prior to Landfall:
Mission 24, Obs 27
B. Center Fix Location: 5 miles (7 km) to the S (176°) from Atlantic City, NJ, USA.
H. 948 mb
Eye temps are:
I. 15 C / 1521 m (59F air temp outside the Eye)
J. 15 C / 1525 m (59F air temp inside the Eye)
K. 13 C / NA (55F dew point inside Eye)

Max Flight Level Temps dropped from 22C/ 72 F to 17C/ 63 F at landfall. Not much of a drop, but still a drop.

Edited by danielw (Thu Nov 01 2012 10:59 PM)


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danielwAdministrator
Moderator


Reged: Wed
Posts: 3502
Loc: Hattiesburg,MS (31.3N 89.3W)
Re: Hurricane Sandy and the Northeastern US [Re: danielw]
      #94243 - Thu Nov 01 2012 11:05 PM

NOUS41 KOKX 312045 RRA
PNSOKX
CTZ009>012-NJZ006-106-108-NYZ071>075-078>081-176>179-070515-

PUBLIC INFORMATION STATEMENT...RETRANSMITTED
NATIONAL WEATHER SERVICE NEW YORK NY
1257 PM EDT TUE OCT 30 2012


...MAXIMUM WATER LEVELS FROM POST-TROPICAL CYCLONE SANDY AND
ACCOMPANYING SURGE...

UNITED STATES GEOLOGICAL SURVEY GAUGES

..........................MAXIMUM.......ASTRONOMICAL....STORM
LOCATION................WATER LEVEL......TIDE LEVEL.....SURGE.....TIME
FREEPORT................10.12 FT NGVD...2.27 FT NGVD....7.85 FT...930 PM
REYNOLDS CHANNEL........10.10 FT NGVD...2.32 FT NGVD....7.78 FT...906 PM
LINDENHURST..............7.73 FT NGVD...1.47 FT NGVD....6.26 FT..1006 PM
EAST ROCKAWAY...........10.80 FT NGVD...2.72 FT NGVD....8.08 FT...842 PM
JAMAICA.................11.65 FT NGVD...3.28 FT NGVD....8.37 FT...936 PM
ROCKAWAY................11.75 FT NGVD...2.81 FT NGVD....8.94 FT...924 PM

NATIONAL OCEAN SERVICE GAUGES

..........................MAXIMUM.......ASTRONOMICAL....STORM
LOCATION................WATER LEVEL......TIDE LEVEL.....SURGE.....TIME
BERGEN POINT............14.60 FT MLLW...5.15 FT MLLW....9.45 FT...924 PM
BATTERY.................13.88 FT MLLW...4.65 FT MLLW....9.23 FT...924 PM
KINGS POINT.............14.38 FT MLLW...5.60 FT MLLW....8.78 FT..1000 PM
BRIDGEPORT..............13.26 FT MLLW...5.31 FT MLLW....7.95 FT..1006 PM
NEW HAVEN...............12.30 FT MLLW...3.97 FT MLLW....8.33 FT...930 PM
NEW LONDON...............8.04 FT MLLW...2.08 FT MLLW....5.96 FT...812 PM
MONTAUK..................7.12 FT MLLW...1.88 FT MLLW....5.24 FT...812 PM


NGVD = NATIONAL GEODETIC VERTICAL DATUM OF 1929

MLLW = MEAN LOWER LOW WATER

STORM SURGE IS DEFINED AS THE ABNORMAL RISE OF WATER GENERATED BY
A STORM...OVER AND ABOVE THE PREDICTED ASTRONOMICAL TIDE. THE
MAXIMUM WATER LEVEL...OR STORM TIDE...IS THE SUM OF THE
ASTRONOMICAL TIDE LEVEL AND STORM SURGE.

FOR THE PURPOSES OF THE TABLES ABOVE...THE MAXIMUM WATER LEVEL
WAS THE HIGHEST WATER LEVEL RECORDED AT THE DESIGNATED GAUGE. THE
ASTRONOMICAL TIDE LEVEL WAS THE PREDICTED TIDE LEVEL FOR THE TIME
THAT THE MAXIMUM WATER LEVEL WAS MEASURED. THE STORM SURGE WAS
CALCULATED BY SUBTRACTING THE ASTRONOMICAL TIDE LEVEL FROM THE
MAXIMUM WATER LEVEL.

$$

MALOIT


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Random Chaos
Weather Analyst


Reged: Sat
Posts: 1023
Loc: Maryland 38.98N 76.50W
Re: Hurricane Sandy and the Northeastern US [Re: danielw]
      #94246 - Sat Nov 03 2012 12:14 PM

An interesting article looking at the hybridization of Sandy: http://www2.ucar.edu/atmosnews/opinion/8243/hybridization-sandy

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