Narrative:

Received ATIS information prior to taxi, official WX was indefinite, 300 ft and 3/4 mi fog. Takeoff minimums for crg are 3/4 for company. Checked in with ground for taxi and clearance with ATIS information. Ground issued clearance and taxi instructions to runway 32. I was not advised of any significant changes in WX. Short of 32 I called for departure. Tower obtained release and cleared me for takeoff without advising me of significant changes in WX. I taxied onto runway and initiated takeoff roll. Another aircraft called for takeoff as I was rolling and tower advised other aircraft visibility was 1/2 mi. New WX was recorded at XX07 local, my departure time. I considered aborting takeoff but by this time aborting takeoff would not be in the interest of safety. I had just about reached vr and was on a critically short runway (4000 ft). My question is if I have initiated takeoff and new WX comes out after I'm on the roll which is below minimums, can I continue? WX came out as I was already rolling -- tower only advised other aircraft, not me.

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Original NASA ASRS Text

Title: ATX PLT QUESTIONS LEGAL STATUS IF TKOF IS MADE WHEN HEARING CTLR ADVISE ANOTHER ACFT THAT WX HAS CHANGED TO BELOW HIS MINIMUM.

Narrative: RECEIVED ATIS INFO PRIOR TO TAXI, OFFICIAL WX WAS INDEFINITE, 300 FT AND 3/4 MI FOG. TKOF MINIMUMS FOR CRG ARE 3/4 FOR COMPANY. CHKED IN WITH GND FOR TAXI AND CLRNC WITH ATIS INFO. GND ISSUED CLRNC AND TAXI INSTRUCTIONS TO RWY 32. I WAS NOT ADVISED OF ANY SIGNIFICANT CHANGES IN WX. SHORT OF 32 I CALLED FOR DEP. TWR OBTAINED RELEASE AND CLRED ME FOR TKOF WITHOUT ADVISING ME OF SIGNIFICANT CHANGES IN WX. I TAXIED ONTO RWY AND INITIATED TKOF ROLL. ANOTHER ACFT CALLED FOR TKOF AS I WAS ROLLING AND TWR ADVISED OTHER ACFT VISIBILITY WAS 1/2 MI. NEW WX WAS RECORDED AT XX07 LCL, MY DEP TIME. I CONSIDERED ABORTING TKOF BUT BY THIS TIME ABORTING TKOF WOULD NOT BE IN THE INTEREST OF SAFETY. I HAD JUST ABOUT REACHED VR AND WAS ON A CRITICALLY SHORT RWY (4000 FT). MY QUESTION IS IF I HAVE INITIATED TKOF AND NEW WX COMES OUT AFTER I'M ON THE ROLL WHICH IS BELOW MINIMUMS, CAN I CONTINUE? WX CAME OUT AS I WAS ALREADY ROLLING -- TWR ONLY ADVISED OTHER ACFT, NOT ME.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.