Set up:
Flying into LGA, the
Expressway Visual to 31. About 5 in the evening, clear blue sky day. ATIS has the winds on the ground as 330@6. On the arrival there was a layer of light chop at about 5000 but other then that it was completely smooth. Landing weight is right around max and the speed is bugged for flaps 45 (full) + 5 knots per the book. Number one for the runway with traffic just rolling out and traffic launching on the crossing runway.
Turning modified base (off the freeway and over Flushing Meadow's Park) tower reports low level windshear. A loss of 25 knots at 1 mile and a loss of 15 knots at 1/2 mile. Surface winds are 340@9.
The previous landing traffic never said anything.
You are now at 1300 feet descending and turning base to final.
What do you do?