Read Page 1 ... just West of the field. Another aircraft just reported 10-15 windshear on final landing on rwy 33. Windshear advisories in effect and just got cleared for takeoff. - Said I would much rather do my decisionmaking at zero altitude and zero airspeed since the scenario makes the hairs on the back of my neck stand up. Asked to cancel takeoff clearance and told tower I would advise when ready. Then started communicating…conferred with FO, told FAs on hold, made PA to passengers thanking them for patience, communicated with dispatch. Then listed all my considerations…developing weather, fuel, takeoff alternates, runway conditions, microbursts, other runway options, Tarmac Delay Program, takeoff performance changes. Finished by stating I would delay takeoff until I assessed conditions to be safe from 27 or...

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