Narrative:

Coming in on ILS to runway 28. It was mostly clear skies. There were 2 cells with heavy rain. One to the north and one to the south of our course. There was one directly on the approach about 1.5 miles from the end of the runway with moderate rain. We could almost see the runway through it. Shortly after we entered in we got a decreasing wind shear warning. I did not initiate an immediate go around because my instrumentation was showing nothing different. No decreasing trend in speed; no unusual power settings we were still on speed and on glide slope. I thought it might be a momentary blip because of the shower we were going through. After a couple seconds the wind shear warning did not go away. I hit the toga button commanded the go around procedure. My first officer did a great job of cleaning up the airplane and talking with ATC. Because we were below 500 AGL he went to max power and we got a momentary engine over speed message by this time we were clear and he pulled the power back to the normal go around power. All of this happened in a very short period of time; I estimate less than 10 seconds. We followed ATC vectors came back around and landed without incident.the rain shower that did not look that bad was worse than we thought. Everything went pretty well I probably could have initiated the go around sooner.

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Original NASA ASRS Text

Title: CRJ-200 Captain experienced a windshear warning below 500 feet AGL during approach and goes around; after a moment's hesitation.

Narrative: Coming in on ILS to Runway 28. It was mostly clear skies. There were 2 cells with heavy rain. One to the North and one to the south of our course. There was one directly on the approach about 1.5 miles from the end of the runway with moderate rain. We could almost see the runway through it. Shortly after we entered in we got a decreasing wind shear warning. I did not initiate an immediate go around because my instrumentation was showing nothing different. No decreasing trend in speed; no unusual power settings we were still on speed and on glide slope. I thought it might be a momentary blip because of the shower we were going through. After a couple seconds the wind shear warning did not go away. I hit the TOGA button commanded the go around procedure. My First Officer did a great job of cleaning up the airplane and talking with ATC. Because we were below 500 AGL he went to max power and we got a momentary engine over speed message by this time we were clear and he pulled the power back to the normal go around power. All of this happened in a very short period of time; I estimate less than 10 seconds. We followed ATC vectors came back around and landed without incident.The rain shower that did not look that bad was worse than we thought. Everything went pretty well I probably could have initiated the go around sooner.

Data retrieved from NASA's ASRS site 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.