#SSMIS
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sausiuswx.bsky.social
A SSMIS 91 Ghz microwave image of Typhoon Fung-wong, taken a couple of hours before landfall, very clearly shows that Uwan was in the midst of an eyewall replacement when it made landfall in Luzon. This cycle was however of course never able to fully complete.
November 9, 2025 at 3:55 PM
sausiuswx.bsky.social
WOW! The latest SSMIS 183 Ghz microwave image of Fung-wong (Uwan) indicates a MW brightness temperatures of less then 110 Kelvin. Literally going off the scale. Just like with IR brightness temp, lower values mean more intense convection. Not sure if I have ever seen this before.
November 8, 2025 at 9:36 PM
sausiuswx.bsky.social
EUMETSATs MetOp-B satellite just happened to be overhead when Kalmaegi apperently made its primary landfall on Homonhon Island. Also notice that unlike 2 hours prior, the eyewall now appears closed. Indicating Tino put the throttle more firmly to the floor in those final hours.
12:20 UTC MetOp-B MHS 183 Ghz Image indicating that Kalmaegi now possesses a more or less symmetrical eyewall all the way around the core. Tho I can tell you that in the mid-levels (89 Ghz) there appears to be some weakness now in the N eyewall. This does however seem like a structural improvement compared to the SSMIS image about 2 hours prior Credits: EUMETSAT, NRL Monterrey SSMIS image at same frequency about 2 hours prior, showing the eyewall quite clearly being open to the southeast. Or at the very least a profound weakness.
November 3, 2025 at 3:17 PM
btangywx.bsky.social
Latest reconnaissance fix, along with recent SSMIS overpass indicate that TS Melissa is still misaligned. Vortex appears tilted toward the north, which is left of shear. Additionally, 183-GHz imagery indicates midlevel dry air continuing to get entrained into the circulation on southern side.
October 24, 2025 at 2:28 PM
Now: MeitY has proposed amendments to IT Rules 2021 to deal with synthetically generated information (deepfakes) by labelling them or identifying them using metadata. Additional obligations proposed for SSMIs.

Comments invited until November 6.

www.meity.gov.in/static/uploa...
www.meity.gov.in
October 22, 2025 at 7:09 AM
osi-saf.eumetsat.int
For a global overview of the implications of the end of SSMIS ou our products, please read this (updated) story:
osi-saf.eumetsat.int/community/st...
Implications of the end of SSMIS data on OSI SAF products | OSI SAF
This page will be regularly updated to provide you with the latest information about SSMIS end of life and about the implications on OSI SAF products.
osi-saf.eumetsat.int
October 17, 2025 at 12:34 PM
osi-saf.eumetsat.int
Due to unstable access to #SSMIS data, we are suspending today the distribution of our #SeaIce concentration interim climate data record based on it (OSI-430-a).
We advise all users to switch to our #AMSR2 based climate products.
for more info: osi-saf.eumetsat.int/community/li...
OSI SAF suspends its Climate product still based on SSMIS (Interim Climate Data Record)
October 17, 2025 at 12:34 PM
disaster-bot.m.ai6yr.org.ap.brid.gy
#cyclones #typhoons #jtwc ABPW10 PGTW 160600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH
PACIFIC OCEANS/160600Z-170600ZOCT2025//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY […]

[Original post on ai6yr.org]
ABPW10 PGTW 160600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH PACIFIC OCEANS/160600Z-170600ZOCT2025// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 96W) PREVIOUSLY LOCATED NEAR 12.4N 143.2E IS NOW LOCATED NEAR 13.7N 137.1E, APPROXIMATELY 222 NM NORTH-NORTHWEST OF YAP. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) AND A 152352Z SSMIS 91 GHZ MICROWAVE IMAGE DEPICTS A WAVE LIKE FEATURE WITH NO DEFINED LOW LEVEL CIRCULATION CENTER (LLCC), FLARING, AND DISPLACED CONVECTION SCATTERED PRIMARILY AROUND THE SOUTHERN PERIPHERY OF THE ASSESSED POSITION. ENVIRONMENTAL ANALYSIS REVEALS MARGINALLY FAVORABLE CONDITIONS FOR DEVELOPMENT WITH MODERATE POLEWARD OUTFLOW, LOW VERTICAL WIND SHEAR (10-15KTS), AND WARM SEA SURFACE TEMPERATURES (29-30 C). GLOBAL MODELS ARE IN FAIR AGREEMENT THAT INVEST 96W WILL STEADILY CONSOLIDATE OVER THE NEXT 24-48 HOURS WHILE TRACKING NORTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1007 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS LOW. (2) NO OTHER SUSPECT AREAS. C. SU
October 16, 2025 at 6:04 PM
disaster-bot.m.ai6yr.org.ap.brid.gy
#cyclones #typhoons #jtwc ABPW10 PGTW 160600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH
PACIFIC OCEANS/160600Z-170600ZOCT2025//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY […]

[Original post on ai6yr.org]
ABPW10 PGTW 160600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH PACIFIC OCEANS/160600Z-170600ZOCT2025// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 96W) PREVIOUSLY LOCATED NEAR 12.4N 143.2E IS NOW LOCATED NEAR 13.7N 137.1E, APPROXIMATELY 222 NM NORTH-NORTHWEST OF YAP. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) AND A 152352Z SSMIS 91 GHZ MICROWAVE IMAGE DEPICTS A WAVE LIKE FEATURE WITH NO DEFINED LOW LEVEL CIRCULATION CENTER (LLCC), FLARING, AND DISPLACED CONVECTION SCATTERED PRIMARILY AROUND THE SOUTHERN PERIPHERY OF THE ASSESSED POSITION. ENVIRONMENTAL ANALYSIS REVEALS MARGINALLY FAVORABLE CONDITIONS FOR DEVELOPMENT WITH MODERATE POLEWARD OUTFLOW, LOW VERTICAL WIND SHEAR (10-15KTS), AND WARM SEA SURFACE TEMPERATURES (29-30 C). GLOBAL MODELS ARE IN FAIR AGREEMENT THAT INVEST 96W WILL STEADILY CONSOLIDATE OVER THE NEXT 24-48 HOURS WHILE TRACKING NORTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1007 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS LOW. (2) NO OTHER SUSPECT AREAS. C. SU
October 16, 2025 at 6:05 AM
zacklabe.com
Technical data update - Due to the U.S. government shutdown, some climate data visualizations on my website may not be updated as usual. I’ll refresh them as soon as possible. Sorry, and thanks for your patience!

Image from nsidc.org/data/g10016/...
A screenshot of the NSIDC website showing three warnings: Notice: The Department of Defense (DoD) has extended the processing and delivery of the Special Sensor Microwave Imager/Sounder (SSMIS) data through the end of the DMSP mission, planned for September 2026. We are working to release a new version of this product later this year that will use AMSR2 in preparation for the September 2026 ending of the SSMIS sensors. We will provide more details on this new version when they become available. Please contact NSIDC User Services if you have questions. After 1 September 2025, the sea ice concentration CDR will no longer have the AMSR2 prototype data. See the User Notice for more information. Due to the lapse in federal government funding, we are no longer receiving SSMIS (DMSP) data. There is no current estimate for when normal operations will resume. We apologize for any inconvenience.
October 3, 2025 at 9:06 PM
kriptabiz.bsky.social
Как прекращение использования спутниковых данных SSMIS повлияет на прогнозирование ураганов

https://kripta.biz/posts/50FECF3E-FA30-434D-AFE2-D03630D4AE87
September 28, 2025 at 2:41 PM
btangywx.bsky.social
Microwave imagery from the SSMIS shows deep convection wrapping around TS Gabrielle’s center, though the vortex still seems tilted toward the east. NOAA reconnaissance flights today will help to determine structure better.
September 20, 2025 at 1:34 PM
osi-saf.eumetsat.int
Following #SSMIS impredictable data provision, in order to ensure our users with a reliable service, we are now basing our Sea Ice Index on AMSR-2-based Sea Ice Concentration product.
more information on: osi-saf.eumetsat.int/community/li...
Release of sea ice index product version v2.3 | OSI SAF
We are now releasing version 2.3 of the OSI SAF Sea Ice Index product. As previously announced (service messages #3328 and #3329), the Sea Ice Index product (OSI-420) will in the future be calculated ...
osi-saf.eumetsat.int
September 2, 2025 at 12:17 PM
sausiuswx.bsky.social
While not taken excactly at the same time, I think it is close enough to compare the quality of the new MWI instrument to SSMIS: 89 Ghz channel looks just about the same in terms of resolution, MWI just looks more ragged for some reason. 37 Ghz channel has much improved quality.
August 24, 2025 at 2:32 PM
pppapin.bsky.social
As expected #Erin has become a very large #hurricane. However, it has lost the very tight inner core it possessed over the weekend.

A quick peak at a recent F18 SSMIS microwave image shows large outer rain bands are just as dominant as the core. 700mb FL wind max is also in the outer bands.
GOES 19 Truecolor Image of Hurricane Erin on 8/20/25 SSMIS microwave 91 GHz image of Hurricane Erin on 0925 UTC 20 Aug 2025
August 20, 2025 at 3:09 PM
kellyhereid.bsky.social
GOOD THING WE STILL HAVE SSMIS
btangywx.bsky.social Brian Tang @btangywx.bsky.social · Aug 15
Additionally, microwave imagery from an SSMIS overpass (images courtesy CIMSS) from around 10 UTC indicates convection encircling the center of Erin. Such a signal is also consistent with imminent RI. Demonstrates the value of SSMIS for monitoring hurricanes.
August 15, 2025 at 4:13 PM
btangywx.bsky.social
Additionally, microwave imagery from an SSMIS overpass (images courtesy CIMSS) from around 10 UTC indicates convection encircling the center of Erin. Such a signal is also consistent with imminent RI. Demonstrates the value of SSMIS for monitoring hurricanes.
August 15, 2025 at 1:47 PM
signeaaboe.bsky.social
New status on OSISAF Sea Ice Index.
With the continuation of SSMIS data distribution, the sea-ice index v2.2 (based on SSMIS) will continue as usual.

The newly implemented branch providing a calibrated AMSR-based index will be monitored and work as a backup.

👉 osi-saf.eumetsat.int/community/li...
Line graph showing sea-ice extent in 2025 for the Southern Hemisphere. In blue is the original sea-ice index (SII) v2.2, which is based on SSMIS. In orange is the similar SII based on AMSR-2 instead. And in red is the calibrated AMSR-based SII, which will run in parallel and work as a backup in case SSMIS fails. Source: OSI SAF Sea-index (OSI-420)
August 1, 2025 at 3:11 PM
osi-saf.eumetsat.int
With the announcement that the U.S. SSMIS data will continue to be distributed after 31 July, the Sea-Ice Index will continue to be produced as usual, based on SSMIS-derived sea-ice concentration, but our plan remains to upgrade the index with data from on the alternative sensor AMSR2. Stay tuned!
August 1, 2025 at 1:27 PM
osi-saf.eumetsat.int
Until 31 July 2025, the Sea-Ice Index was based on our Sea-Ice Concentration Interim Climate Data Record using SSMIS. Last 16 days are based on the fast-track data generated faster than the nominal ones, that may differ slightly.
More information on: osi-saf.eumetsat.int/products/osi...
Global Sea Ice Concentration interim climate data record, release 3 | OSI SAF
osi-saf.eumetsat.int
August 1, 2025 at 11:41 AM
rarohde.bsky.social
For all the sea ice nerds, NSIDC has announced a new version of the sea ice index that replaces SSMIS data with AMSR2 (starting Jan 1, 2025 and continuing for all future updates).

This new dataset was developed in response to the plans to kill SSMIS.

nsidc.org/data/user-re...
New version release: NOAA/NSIDC Sea Ice Index, Version 4 | National Snow and Ice Data Center
NOAA@NSIDC is pleased to announce the release of Sea Ice Index, Version 4.
nsidc.org
August 1, 2025 at 11:14 AM
signeaaboe.bsky.social
Note - that the decommission of the DMSP (SSMIS) has been postponed ...
And SSMIS data will be provided on a "best effort" basis.

Stay updated on product implications here 👉 osi-saf.eumetsat.int/community/st...

@osi-saf.eumetsat.int
Implications of the end of SSMIS data on OSI SAF products | OSI SAF
osi-saf.eumetsat.int
August 1, 2025 at 9:28 AM
bettycjung.bsky.social
Equipped with a powerful instrument called the Special Sensor Microwave Image Sounder, or SSMIS, these satellites capture microwave imagery of hurricanes—essentially 3D X-rays. This allows forecasters to see the interior structures of storms.
August 1, 2025 at 4:58 AM
zacklabe.com
*Note: to accompany this data change (SSMIS to AMSR2), I will update all of my sea ice visualizations on my website this coming weekend to be consistent with this latest version.
August 1, 2025 at 1:07 AM
us.meteored.com
🎉 Good News!

Amidst recent staffing cuts, #NOAA will continue to receive crucial SSMIS #satellite 🛰️ data from the Defense Department through Fall 2026!

Khiana Watson has the update.⬇️
www.theweather.com/news/trendin...
NOAA to Receive Continued Satellite Data from Defense Department Amid Staffing Cuts
Defense Dept agrees to keep supplying NOAA hurricane satellite data through 2026 amid agency layoffs and funding cuts.
www.theweather.com
July 31, 2025 at 5:35 PM