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Major Hurricane Gonzalo


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Thanks for the reply. I was not aware that there was an elevated station that measured a higher sustained wind than the 98 mph I referenced. That aside, I stand by everything else I wrote in that post, and totally agree with everything else you stated.

Important to remember- Bermuda reports 10 minute sustained winds not 1 minute like us.

Steve

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These are the reports from Cape Race, Newfoundland from 0900z to 1100z. The pressure dropped to 973.7mb, wind gusts peaked at 54 knots (62mph) and 48 knots (55mph) as the wind shifted E to NW.

 

CWRA 191100Z AUTO 32036G48KT 16/ RMK AO1 6PAST HR PRESRR 5014 PK WND 32054/1046 SLP856 P0002 T0159 50294
CWRA 191000Z AUTO 34028G35KT 16/ RMK AO1 4PAST HR 6227 PK WND 09047/0904 SLP737 P0017 T0155 50288
CWRA 190900Z AUTO 09036G48KT 14/ RMK AO1 9PAST HR PRESFR 8271 PK WND 08048/0859 SLP745 P0035 T0135 50244

 

HPC analysis says the low center was 969mb (967mb at 12z) as it passed close to Cape Race at 09z

 

post-1182-0-23461500-1413749626_thumb.pn

 

 

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TXKF 180116Z 26025G36KT 4000 -RA BR OVC012 24/24 Q0953 RMK WND EST WSHFT16

TXKF 180055Z 18009KT 160V220 4000 -RA BR OVC012 24/24 Q0953 RMK WND EST

TXKF 180041Z 15011KT 4000 -RA BR OVC012 24/24 Q0953 RMK WND EST

TXKF 172355Z 12064G83KT 1600 +RA BR OVC012 24/24 Q0957 RMK WND EST PRESFR

TXKF 172255Z 10066KT 1600 +RA BR OVC012 24/24 Q0973 RMK WND EST PRESFR

 

Based on these observations, the eyewall passed over Bermuda, and the center of the eye was just west of Bermuda. There was a brief southerly wind while in the eye, with easterly and westerly just before and after.

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I would guess that these images are (smoothed) 85 GHz horizontal brightness temperatures from SSMI satellite passes. I think that a low brightness temperature under 160K (red stuff), amongst 250K brightness temperatures (blue stuff) would mean that it's just some bad data. It looks like a U-shape because the microwave radiometer does a conical scan of the earth's surface (kind of like a cone intersecting a plane.) It doesn't take long to do one scan. As per Wikipedia,  "The spin rate of the SSM/I provides a period of 1.9 sec..." So this weird group of sub-160 Kelvin temperatures only represents about 6 seconds of data that went bad. This is fairly normal to see weird crap like this, once or twice per orbit.

 

http://en.wikipedia.org/wiki/Special_sensor_microwave/imager

 

a couple of examples of crap data from SSMI satellites (note the U-shaped holes in the data. It was flagged as bad data) The wide white areas are areas that didn't get covered on successive ascending passes.

 

post-1182-0-89953000-1413781307_thumb.pn

 

post-1182-0-64394800-1413781318_thumb.jp

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I would guess that these images are (smoothed) 85 GHz horizontal brightness temperatures from SSMI satellite passes. I think that a low brightness temperature under 160K (red stuff), amongst 250K brightness temperatures (blue stuff) would mean that it's just some bad data. It looks like a U-shape because the microwave radiometer does a conical scan of the earth's surface (kind of like a cone intersecting a plane.) It doesn't take long to do one scan. As per Wikipedia,  "The spin rate of the SSM/I provides a period of 1.9 sec..." So this weird group of sub-160 Kelvin temperatures only represents about 6 seconds of data that went bad. This is fairly normal to see weird crap like this, once or twice per orbit.

 

http://en.wikipedia.org/wiki/Special_sensor_microwave/imager

 

a couple of examples of crap data from SSMI satellites (note the U-shaped holes in the data. It was flagged as bad data) The wide white areas are areas that didn't get covered on successive ascending passes.

 

attachicon.gif85GHz SSMI brightness.png

 

attachicon.gifSSMI F15 TPW october 13th.jpg

 

Ana thread?

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Do you want me to remove my post, since it is cluttering things up a bit now? My post was regarding this: I responded to some weird data, (or conspiracy theory,) in the microwave imagery of Gonzalo. It was just some bad data that happens about once per orbit on SSM/I microwave imagers.

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Based on these observations, the eyewall passed over Bermuda, and the center of the eye was just west of Bermuda. There was a brief southerly wind while in the eye, with easterly and westerly just before and after.

The NHC mentioned the center of the eye appeared to go over Devonshire Parish near the center of the islands.  TXKF is located in St. David's...on the east end.  

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