When do you launch an appeal?

The full criteria for when we launch an appeal can be found here. The main criteria are:

• The disaster must be on such a scale and of such urgency as to call for swift international humanitarian assistance  
• The DEC member agencies, or some of them, must be in a position to provide effective and swift humanitarian assistance at a scale to justify a national appeal  
• There must be reasonable grounds for concluding that a public appeal would be successful, either because of evidence of existing public sympathy for the humanitarian situation or because there is a compelling case indicating the likelihood of significant public support should an appeal be launched