Re: [idvusers] Threshold for closed circle in station model?

• To: idvusers@xxxxxxxxxxxxxxxx
• Subject: Re: [idvusers] Threshold for closed circle in station model?
• From: Julien Chastang <chastang@xxxxxxxx>
• Date: Tue, 16 Apr 2013 15:39:14 -0600

Professor Herbster,

We've been burned ourselves :-)

My notes say:

- a circle for calm winds (0 speed)
- a shaft with no barbs<= 2.5 knots
- a shaft with a half barb for > 2.5 and< 7.5 knots

Please let us know if you have further questions.

Best Wishes,

Unidata IDV Support


On 4/16/13 3:02 PM, Chris Herbster wrote:

Hi folks,

Before I attempt to look through code that I don't know (in a language I can barely read), can anyone help with a definitive answer to the thresholds used to draw a "calm" circle around a station, a shaft with no barbs, and then the 5 knot increment for the barbs? (I assume that a "short barb" for "5 kts" is drawn is speed is >2.5 kts and <= 7.5, but I have gotten burned by an assumption more than once in the past!)

As always, any help is welcome!

Thanks,
Chris Herbster

• References:
  • [idvusers] Threshold for closed circle in station model?
    • From: Chris Herbster