SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                (Amendment No. 1)

                   Under the Securities Exchange Act of 1934*

                         Flow International Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    343468104
--------------------------------------------------------------------------------
                      (CUSIP Number of Class of Securities)

                                 Daniel S. Loeb
                                 Third Point LLC
                                 390 Park Avenue
                               New York, NY 10022
                                 (212) 224-7400
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   Copies to:
                            Michael A. Schwartz, Esq.
                          Willkie Farr & Gallagher LLP
                               787 Seventh Avenue
                             New York, NY 10019-6099
                                 (212) 728-8000

                                  April 4, 2007
--------------------------------------------------------------------------------
                          (Date of Event which Requires
                            Filing of this Schedule)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box: [X]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).






                                  SCHEDULE 13D



-------------------------------                      ---------------------------
CUSIP No. 343468104                                  Page 2 of 6 Pages
-------------------------------                      ---------------------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Third Point LLC
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                (a) [ ]
                                                                (b) [X]
----------- --------------------------------------------------------------------
    3       SEC USE ONLY
----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
            ITEMS 2(d) or 2(e) [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
                         8      SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED              5,060,000
BY EACH REPORTING     --------- ------------------------------------------------
PERSON WITH              9      SOLE DISPOSITIVE POWER

                                0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                5,060,000
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            5,060,000
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
            SHARES* [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            13.6%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            OO
----------- --------------------------------------------------------------------







                                  SCHEDULE 13D



-------------------------------                      ---------------------------
CUSIP No. 343468104                                  Page 3 of 6 Pages
-------------------------------                      ---------------------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Third Point Offshore Fund, Ltd.
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                (a) [ ]
                                                                (b) [X]
----------- --------------------------------------------------------------------
    3       SEC USE ONLY
----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
            ITEMS 2(d) or 2(e) [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            Cayman Islands
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
                         8      SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED              3,397,200
BY EACH REPORTING     --------- ------------------------------------------------
PERSON WITH              9      SOLE DISPOSITIVE POWER

                                0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                3,397,200
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            3,397,200
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
            SHARES* [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            9.1%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            OO
----------- --------------------------------------------------------------------








                                  SCHEDULE 13D



-------------------------------                      ---------------------------
CUSIP No. 343468104                                  Page 4 of 6 Pages
-------------------------------                      ---------------------------


----------- --------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

            Daniel S. Loeb
----------- --------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                (a) [ ]
                                                                (b) [X]
----------- --------------------------------------------------------------------
    3       SEC USE ONLY
----------- --------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
----------- --------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT TO
            ITEMS 2(d) or 2(e) [ ]

----------- --------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            United States
--------------------- --------- ------------------------------------------------
                         7      SOLE VOTING POWER

                                0
                      --------- ------------------------------------------------
                         8      SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED              5,060,000
BY EACH REPORTING     --------- ------------------------------------------------
PERSON WITH              9      SOLE DISPOSITIVE POWER

                                0
                      --------- ------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                5,060,000
----------- --------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

            5,060,000
----------- --------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
            SHARES* [ ]

----------- --------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            13.6%
----------- --------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            IN
----------- --------------------------------------------------------------------







     This Amendment No. 1 amends the Schedule 13D filed on February 2, 2007 (as
amended by this Amendment No. 1, the "Schedule 13D") and is being filed on
behalf of Third Point LLC, a Delaware limited liability company (the "Management
Company"), Daniel S. Loeb, an individual ("Mr. Loeb"), and Third Point Offshore
Fund, Ltd., a Cayman Islands limited liability exempted company (the "Offshore
Fund", and together with Mr. Loeb and the Management Company, the "Reporting
Persons"). This Amendment No. 1 relates to the Common Stock, par value $0.01 per
share, of Flow International Corporation, a Washington corporation (the
"Company"). The Management Company is the investment manager or adviser to a
variety of hedge funds and managed accounts (such funds and accounts,
collectively, including but not limited to the Offshore Fund, the "Funds"). The
Funds directly own the Common Stock to which the Schedule 13D relates, and Mr.
Loeb and the Management Company may be deemed to have beneficial ownership over
such Common Stock by virtue of the authority granted to them by the Funds to
vote and to dispose of the securities held by the Funds, including the Common
Stock.

Item 4.   Purpose of Transaction.

     On April 4, 2007, Mr. Loeb sent a letter to the Board of Directors of the
Company, expressing his disappointment with the response of the Company's Board
of Directors to his call for the Company to be sold. In the letter, Mr. Loeb
urged the Board to retain, and publicly disclose, a well recognized investment
bank to lead the sale process. Mr. Loeb also reiterated his concern over the
cost to the Company of its status as a public company and the Company's
relatively small scale of operations. A copy of the letter is filed herewith as
Exhibit 99.1 and is incorporated herein by reference in its entirety.

Item 7.   Material to be Filed as Exhibits.

  99.1    Letter, dated April 4, 2007, from Mr. Loeb to the Board
          of Directors of the Company.



                         [Signatures on following page]



                                       5







                                   SIGNATURES

     After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


Dated: April 4, 2007


                                THIRD POINT LLC



                                By:   /s/ Daniel S. Loeb
                                      ------------------------------------------
                                      Name:   Daniel S. Loeb
                                      Title:  Chief Executive Officer




                                THIRD POINT OFFSHORE FUND, LTD.



                                By:   Daniel S. Loeb
                                      ------------------------------------------
                                      Name:   Daniel S. Loeb
                                      Title:  Director




                                /s/ Daniel S. Loeb
                                ------------------------------------------------
                                Daniel S. Loeb







               [SIGNATURE PAGE TO AMENDMENT NO. 1 TO SCHEDULE 13D
                 WITH RESPECT TO FLOW INTERNATIONAL CORPORATION]