As far as I know there is no system in use that would alert people before the disaster.
To all the other questions, quite a lot of countries have adopted Sahana Eden, that does all the tasks related to the Management of the Disaster, including all the information you have putted there and a lot more...
It has been deployed in large disaster scenarios and ...
The two most promising open source solutions for disaster management seem to be Sahana Eden and Ushahidi. To quote from their respective websites:
Sahana Eden is an Open Source Humanitarian Platform which can be used to provide solutions for Disaster Management, Development, and Environmental Management sectors.
The Global Disaster Alert and Coordination System should address the alert part.
GDACS is a cooperation framework between the United Nations, the
European Commission and disaster managers worldwide to improve alerts,
information exchange and coordination in the first phase after major
As for the coordination of relief etc, ...
Regarding the request from philshem in the comments to the question, I will post my comment details as an answer.
Disclosure: I am the author of the mentioned website.
As a suggestion, as I feel it fits the question and this was migrated from softwarerecs: Currently, I am getting emergency location data up and running and have recently added wildfires and ...
In June 2013, the City of Calgary, Alberta experienced severe flooding.
The City has made very high resolution orthophoto mosaics available at no cost on their website. The licences specifies non-commercial use - see the links below for the specifics.
One was captured during the flood (not necessarily at the peak) and another was captured a few months ...
https://www.napsgfoundation.org/hurricane-harvey-resources/ links to sources that contain some of the information you want.
Such as a link to https://respond-harvey-geoplatform.opendata.arcgis.com/, which has base population data. As you’ll see even from this one example, what is considered an impacted area varies.
This file is really hard to find. But maybe parse http://www.ospo.noaa.gov/Products/atmosphere/vaac/boundaries.js
and share the result?
Parsing that .js was messy -- instead I made a GeoTIFF:
You could have look at Dartmouth Flood Observatory website.
They provide 1985 to current (according to the website) flooding data worldwide. Data is available in textual formats like HTML (recent events only) or XML. There is only centroids of the floods available.
If you are looking for flood extents (outlines), there is a shapefile available as well. ...
Yahoo Japan collected 45,000 these entries at https://loco.yahoo.co.jp/search/?genrecd=0425 . There are also buttons to display them on map and such.
Example entry: https://loco.yahoo.co.jp/place/g-WsTnclfhKys/?genrecd=0425
Edit: Information can be accessed via API, information about the Yahoo Loco service api: https://developer.yahoo.co.jp/webapi/map/...