B767-300 enroute WX radar failed with forecast thunderstorms in the vicinity; emergency declared for overweight landing and an uneventful return to the departure airport ensued.

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Attributes
ACN	798817
Time
Date	200808
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 29000
Environment
Weather Elements	Thunderstorm
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	798817
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport other
Consequence	other
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

During climb out and cruise; WX radar failed with thunderstorms in the area and forecast en route. Returned to ZZZ; declared emergency for overweight landing; did not dump fuel. Uneventful; overweight landing at ZZZ with emergency equipment standing by.

Original NASA ASRS Text

Title: B767-300 ENROUTE WX RADAR FAILED WITH FORECAST TSTMS IN THE VICINITY; EMERGENCY DECLARED FOR OVERWEIGHT LANDING AND AN UNEVENTFUL RETURN TO THE DEPARTURE AIRPORT ENSUED.

Narrative: DURING CLBOUT AND CRUISE; WX RADAR FAILED WITH TSTMS IN THE AREA AND FORECAST ENRTE. RETURNED TO ZZZ; DECLARED EMER FOR OVERWT LNDG; DID NOT DUMP FUEL. UNEVENTFUL; OVERWT LNDG AT ZZZ WITH EMER EQUIP STANDING BY.

Data retrieved from NASA's ASRS site as of May 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.