# ASCII atmospheric data\_pressure **URL:** \ **Category:** TELEMAC-2D\ **Created:** [July 7, 2026, 12:30pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150 "2026-07-07T12:30:45Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![user\_18136](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/4da419/32.png) [@user\_18136](https://opentelemac.org/forum/u/user_18136)\ **Post date:** [July 7, 2026, 12:30pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/1 "2026-07-07T12:30:45Z")
Hello [name removed], I am a beginner user of Telemac2D. For a coastal flooding simulation, I wanted to add the option for atmospheric pressure variation (spatially constant) using an ASCII file. I consulted the user guide (the steering file and ASCII file are attached). The results show no difference between the water level with the tide alone and the level with the atmospheric pressure included. I would appreciate your help. Best regards. [atpressure.txt](https://opentelemac.org/forum/uploads/short-url/7U6OKULOnfvrRoE78mY0XrLokLs.txt) (158 KB) [Bas\_Champs.cas](https://opentelemac.org/forum/uploads/short-url/kurgTJRjOWdfVPYpxJbXIsQHLH0.cas) (4.6 KB) ---
**Author:** ![user\_63](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c4cdca/32.png) [@user\_63](https://opentelemac.org/forum/u/user_63)\ **Post date:** [July 7, 2026, 2:39pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/2 "2026-07-07T14:39:29Z")
Hi I didn’t checked but it seems to me that the atmospheric pressure is implemented only in terms of spatial gradient then just changing the value everywhere doesn’t change the result… Hope this helps ---
**Author:** ![user\_18136](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/4da419/32.png) [@user\_18136](https://opentelemac.org/forum/u/user_18136)\ **Post date:** [July 7, 2026, 2:43pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/3 "2026-07-07T14:43:09Z")
Thanks to your response, How do I ensure that the change in atmospheric pressure values ​​takes effect on the water level? ---
**Author:** ![user\_63](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c4cdca/32.png) [@user\_63](https://opentelemac.org/forum/u/user_63)\ **Post date:** [July 7, 2026, 5:12pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/4 "2026-07-07T17:12:17Z")
if possible, your could try to use a spatially variable pressure… As I use it for cyclonic simulation, with atmospheric file, I’m sure it works… ---
**Author:** ![user\_9835](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8e7dd6/32.png) [@user\_9835](https://opentelemac.org/forum/u/user_9835)\ **Post date:** [July 9, 2026, 4:39am UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/5 "2026-07-09T04:39:51Z")
Hi, the atmospheric file you are using is for cyclonic simulation is Binary file containing wind and pressure right? Thanks, ---
**Author:** ![user\_63](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c4cdca/32.png) [@user\_63](https://opentelemac.org/forum/u/user_63)\ **Post date:** [July 10, 2026, 12:15pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/6 "2026-07-10T12:15:22Z")
yes ---
**Author:** ![user\_18136](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/4da419/32.png) [@user\_18136](https://opentelemac.org/forum/u/user_18136)\ **Post date:** [July 12, 2026, 10:22am UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/7 "2026-07-12T10:22:33Z")
Hello, I have 2 kind of error messages when I try to use API (even with my own profile) or local downloaded grib file from copernicus ERA5 when I use converter ecmwf2srf Best regards, ![APIrequest.png](https://opentelemac.org/uploads/default/original/2X/0/02bc3ead010d9a98acacd04963ec0e01c61f6772.png) ![Localconversionfromgrib.png](https://opentelemac.org/uploads/default/original/2X/6/6bc307e02006058f3ecb32316182ed0717eb0b8e.png) ---
**Author:** ![user\_438](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c77e96/32.png) [@user\_438](https://opentelemac.org/forum/u/user_438)\ **Post date:** [August 2, 2026, 5:47pm UTC](https://opentelemac.org/forum/t/ascii-atmospheric-data-pressure/8150/8 "2026-08-02T17:47:57Z")
Hello, In your 2 logs, it is written “HTTPError 404: Not Found” 2 times. [name removed] answer: “In HTTP, the 404 HTTP status code indicates that a web client (i.e. browser) was able to communicate with a server, but the server could not provide the requested resource.” Hope this helps, [name removed]