A B767 captain reported receiving sigmets during flight which did not include enough information for...

Narrative:

We received three sigmets on this flight at approximately the same time. One had 17 points describing an area of moderate turbulence. Most of these points were not in the database. This is a recurring problem. Many SIGMET reports use points that are very difficult to locate. Often low altitude navaids are used. While I am sure that our national weather service is composed of many outstanding individuals with the best of intent; they need to know that their location of meteorological data is often very difficult and time consuming to decipher. Please ask them to locate this data by use of high altitude navaids or lat/long. The difficulty presented by the present system is a safety of flight issue because of the time often required to locate sigmets.

Original NASA ASRS Text

Title: A B767 Captain reported receiving SIGMETs during flight which did not include enough information for the crew to plot the locations because neither Latitude/Longitude nor high altitude NAVAIDs were used to identify the turbulence locations.

Narrative: We received three SIGMETs on this flight at approximately the same time. One had 17 points describing an area of moderate turbulence. Most of these points were not in the database. This is a recurring problem. Many SIGMET reports use points that are very difficult to locate. Often low altitude NAVAIDs are used. While I am sure that our National Weather Service is composed of many outstanding individuals with the best of intent; they need to know that their location of meteorological data is often very difficult and time consuming to decipher. Please ask them to locate this data by use of HIGH ALTITUDE NAVAIDS or Lat/Long. The difficulty presented by the present system is a safety of flight issue because of the time often required to locate SIGMETs.

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	879147
Time
Date	201003
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	No Specific Anomaly Occurred All Types

A B767 captain reported receiving sigmets during flight which did not include enough information for the crew to plot the locations because neither latitude/longitude nor high altitude navaids were used to identify the turbulence locations.