B757 flight crew reports a go-around at their destination due to windshear and a subsequent diversio...

Narrative:

We flew through a break in a line of thunderstorms with the intent of getting on the north side of the line and landing north at our destination. The line of weather closed off the approach course so we started positioning for landing to the south with a 4 KT tailwind. The wind suddenly shifted out of the west gusting to 32 KTS. I decided to try the VOR approach on another runway. At around 400 ft we received a windshear warning from the rapidly approaching storm front. Executed a go-around with a immediate right turn to north. The weather rolled over the field and the parade of thunderstorms precluded wasting any time attempting to hold. Diverted to our alternate. IMC. Real bouncy ride; st elmo's; lightening; moderate to heavy rain with tat well below 10 degrees celsius. The first officer's airspeed indicator and the stby indicator started fluctuating wildly. Rudder ratio and mach speed trim EICAS messages also briefly displayed. Declared emergency due to the airspeed indication issue. Landed without incident.

Original NASA ASRS Text

Title: B757 flight crew reports a go-around at their destination due to windshear and a subsequent diversion to their alternate. Airspeed indication anomalies prompt the crew to declare an emergency enroute while ACARS messages from the Dispatcher are reported as very distracting.

Narrative: We flew through a break in a line of thunderstorms with the intent of getting on the north side of the line and landing north at our destination. The line of weather closed off the approach course so we started positioning for landing to the south with a 4 KT tailwind. The wind suddenly shifted out of the west gusting to 32 KTS. I decided to try the VOR approach on another runway. At around 400 FT we received a windshear warning from the rapidly approaching storm front. Executed a go-around with a immediate right turn to north. The weather rolled over the field and the parade of thunderstorms precluded wasting any time attempting to hold. Diverted to our alternate. IMC. Real bouncy ride; St Elmo's; lightening; moderate to heavy rain with TAT well below 10 degrees Celsius. The First Officer's airspeed indicator and the STBY indicator started fluctuating wildly. Rudder Ratio and Mach Speed Trim EICAS messages also briefly displayed. Declared emergency due to the airspeed indication issue. Landed without incident.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	870743
Time
Date	201001
Local Time Of Day	1801-2400
Place
Locale Reference	ZKC.ARTCC
State Reference	KS
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Final Approach Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Airspeed Indicator
Person 1
Function	Captain Pilot Flying
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

B757 flight crew reports a go-around at their destination due to windshear and a subsequent diversion to their alternate. Airspeed indication anomalies prompt the crew to declare an emergency enroute while ACARS messages from the dispatcher are reported as very distracting.