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10 Nov 2025 - 18:16 EST
10 Nov 2025 - 23:16 UTC

Post-tropical Cyclone Katia at 28.0°N - 34.4°W

North Atlantic Ocean

Last observation: 05 Sep 2023 - 05:10 UTC

« 2023 Storms »

1 Sep 2023 - 4 Sep 2023

Approximately 2500 miles from the U.S. east coast


Storm images and information

NHC Storm Description:

4 Sep 2023 - 21:00 UTC ...KATIA HAS COME TO THE END... ...THIS IS THE LAST NHC ADVISORY... As of 9:00 PM GMT Mon Sep 4 the center of Katia was located near 28.0, -34.4 with movement NW at 2 mph. The minimum central pressure was 1010 mb with maximum sustained winds of about 35 mph.

4 Sep 2023 - 15:00 UTC ...KATIA FORECAST TO BECOME A REMNANT LOW TONIGHT... As of 3:00 PM GMT Mon Sep 4 the center of Katia was located near 28.0, -34.0 with movement NW at 5 mph. The minimum central pressure was 1009 mb with maximum sustained winds of about 35 mph.

4 Sep 2023 - 9:00 UTC ...KATIA HANGING ON AS A TROPICAL CYCLONE... As of 9:00 AM GMT Mon Sep 4 the center of Katia was located near 27.7, -33.7 with movement NW at 7 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 35 mph.

4 Sep 2023 - 3:00 UTC ...KATIA WEAKENS TO A TROPICAL DEPRESSION... As of 3:00 AM GMT Mon Sep 4 the center of Katia was located near 27.1, -33.4 with movement WNW at 6 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 35 mph.

3 Sep 2023 - 21:00 UTC ...KATIA BARELY A TROPICAL STORM... As of 9:00 PM GMT Sun Sep 3 the center of Katia was located near 27.1, -32.9 with movement NW at 7 mph. The minimum central pressure was 1006 mb with maximum sustained winds of about 40 mph.

3 Sep 2023 - 15:00 UTC ...KATIA FORECAST TO BECOME POST-TROPICAL ON MONDAY... As of 3:00 PM GMT Sun Sep 3 the center of Katia was located near 26.7, -32.3 with movement NW at 7 mph. The minimum central pressure was 1006 mb with maximum sustained winds of about 40 mph.

3 Sep 2023 - 9:00 UTC ...KATIA QUICKLY WEAKENING... ...EXPECTED TO BECOME A POST-TROPICAL CYCLONE SOON... As of 9:00 AM GMT Sun Sep 3 the center of Katia was located near 26.0, -31.9 with movement NW at 9 mph. The minimum central pressure was 1005 mb with maximum sustained winds of about 40 mph.

3 Sep 2023 - 3:00 UTC ...KATIA'S THUNDERSTORMS DECREASING... As of 3:00 AM GMT Sun Sep 3 the center of Katia was located near 26.5, -31.0 with movement NNW at 16 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 45 mph.

2 Sep 2023 - 21:00 UTC ...KATIA OVERACHIEVING IN THE EASTERN ATLANTIC BUT EXPECTED TO WEAKEN TOMORROW... As of 5:00 PM AST Sat Sep 2 the center of Katia was located near 25.0, -30.5 with movement NW at 13 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 60 mph.

2 Sep 2023 - 15:00 UTC ...KATIA MAINTAINING STRENGTH OVER THE EASTERN ATLANTIC... As of 2:00 PM CVT Sat Sep 2 the center of Katia was located near 23.9, -29.7 with movement NNW at 12 mph. The minimum central pressure was 1000 mb with maximum sustained winds of about 50 mph.

2 Sep 2023 - 12:40 UTC ...KATIA STRENGTHENING... As of 11:40 AM CVT Sat Sep 2 the center of Katia was located near 23.5, -29.4 with movement NNW at 13 mph. The minimum central pressure was 1000 mb with maximum sustained winds of about 50 mph.

2 Sep 2023 - 9:00 UTC ...DEPRESSION BECOMES TROPICAL STORM KATIA... As of 8:00 AM CVT Sat Sep 2 the center of Katia was located near 22.7, -29.4 with movement NNW at 13 mph. The minimum central pressure was 1005 mb with maximum sustained winds of about 40 mph.

2 Sep 2023 - 3:00 UTC ...TROPICAL DEPRESSION COULD BECOME A BRIEF TROPICAL STORM ON SATURDAY... As of 2:00 AM CVT Sat Sep 2 the center of Twelve was located near 21.6, -28.7 with movement N at 13 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 35 mph.

1 Sep 2023 - 21:00 UTC ...TROPICAL DEPRESSION COULD BECOME A SHORT-LIVED TROPICAL STORM TONIGHT OR ON SATURDAY... As of 8:00 PM CVT Fri Sep 1 the center of Twelve was located near 20.8, -28.7 with movement NNW at 12 mph. The minimum central pressure was 1006 mb with maximum sustained winds of about 35 mph.

1 Sep 2023 - 15:00 UTC ...TROPICAL DEPRESSION FORMS OVER THE EASTERN ATLANTIC... As of 2:00 PM CVT Fri Sep 1 the center of Twelve was located near 19.6, -28.3 with movement NNW at 8 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 35 mph.

Post-tropical Cyclone Katia at 28.0°N - 34.4°W

GeoColor

True Color daytime, multispectral IR at night
5 Sep 2023 - 04:50 UTC

Last update > 1 hour

GLM FED

Lightning flash extent over GeoColor
5 Sep 2023 - 04:51 UTC

Last update > 1 hour

Day Convection

RGB used to identify areas of rapid intensification
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Day Night Cloud Micro Combo

Day: show phase of cloud tops; night: distinguish clouds from fog
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Air Mass RGB

RGB based on data from IR & water vapor
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Sandwich RGB

Blend combines IR band 13 with visual band 3
5 Sep 2023 - 04:40 UTC

Last update > 1 hour


Band 1

0.47 µm
Blue - Visible
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 2

0.64 µm
Red - Visible
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 3

0.86 µm
Veggie - Near IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 4

1.37 µm
Cirrus - Near IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 5

1.6 µm
Snow/Ice - Near IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 6

2.2 µm
Cloud Particle - Near IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 7

3.9 µm
Shortwave Window - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 8

6.2 µm
Upper-Level Water Vapor - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 9

6.9 µm
Mid-Level Water Vapor - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 10

7.3 µm
Lower-level Water Vapor - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 11

8.4 µm
Cloud Top - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 12

9.6 µm
Ozone - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 13

10.3 µm
Clean Longwave Window - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 14

11.2 µm
Longwave Window - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 15

12.3 µm
Dirty Longwave Window - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour

Band 16

13.3 µm
CO₂ Longwave - IR
5 Sep 2023 - 04:40 UTC

Last update > 1 hour