Tpa controller expressed concern regarding the accuracy of the tower wind equipment.

Attributes
ACN	707673
Time
Date	200608
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tpa.airport
State Reference	FL
Altitude	agl single value : 1000
Environment
Weather Elements	Rain Windshear
Light	Daylight
Aircraft 1
Controlling Facilities	tower : tpa.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller military : 4 controller radar : 24
ASRS Report	707673
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	inflight encounter : weather
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Weather FAA
Primary Problem	FAA
Situations
ATC Facility	computer equipment : tpa.tower

Narrative:

Rain showers in the vicinity; windshear in several quadrants. Aircraft informed of a loss of 20 KTS 1 mi of departure end of runway. Pilot acknowledged and elected to depart. After departure and within 1 mi of the departure end the local controller ask if there was any perceived change in airspeed. The pilot reported no change; either plus or minus in airspeed after takeoff. This phenomenon has been observed by myself and other controllers numerous times at tpa. I feel strongly that the wind measuring equipment is erroneous and causing undue delays to the aviation community.

Original NASA ASRS Text

Title: TPA CTLR EXPRESSED CONCERN REGARDING THE ACCURACY OF THE TWR WIND EQUIP.

Narrative: RAIN SHOWERS IN THE VICINITY; WINDSHEAR IN SEVERAL QUADRANTS. ACFT INFORMED OF A LOSS OF 20 KTS 1 MI OF DEP END OF RWY. PLT ACKNOWLEDGED AND ELECTED TO DEPART. AFTER DEP AND WITHIN 1 MI OF THE DEP END THE LCL CTLR ASK IF THERE WAS ANY PERCEIVED CHANGE IN AIRSPD. THE PLT RPTED NO CHANGE; EITHER PLUS OR MINUS IN AIRSPD AFTER TKOF. THIS PHENOMENON HAS BEEN OBSERVED BY MYSELF AND OTHER CTLRS NUMEROUS TIMES AT TPA. I FEEL STRONGLY THAT THE WIND MEASURING EQUIP IS ERRONEOUS AND CAUSING UNDUE DELAYS TO THE AVIATION COMMUNITY.

Data retrieved from NASA's ASRS site as of January 2009 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.