What are the requirements for an employee to furnish notice to an employer where the need for FMLA leave is not foreseeable?

need for FMLA leave is not foreseeable? (See 29 CFR § 825.303) (a) When the approximate timing of the need for leave is not foreseeable, an employee shall give such notice to the employer of the need for FMLA leave as is practicable under the facts and circumstances of the particular case. It is expected that an employee shall give notice to the employer within no more than one or two working days of learning of the need for leave, except in extraordinary circumstances of the particular case where such notice is not feasible. In the case of a medical emergency requiring leave because of an employee's own serious health condition or to care for a family member with a serious health condition, written advance notice pursuant to an employer's internal rules and procedures may not be required when FMLA leave is involved. (b) The employee should provide notice to the employer either in person or by telephone, telegraph, facsimile machine ("fax") or other electronic means. Notice may be given by the employee's spokesperson (e.g., spouse, adult family member or other responsible party) if the employee is unable to do so personally. The employee need not expressly assert rights under the FMLA or even mention the FMLA, but may only state that leave is needed. The employer shall be expected to obtain any additional required information through informal means. The employee or spokesperson shall be expected to provide more information when it can readily be accomplished as a practical matter, taking into consideration the exigencies of the situation.