[NLRS] ND Baloon Launch - August 27th

[Baker, Donn B]

Hmm, if we use a "rain-scatter" analogy, then 270 miles requires a 35-36,000 elevation (top of the storm tower) to be visible.  Typically, a balloon will make _at least_ 50-55,000', and many of the launches reach to the 80,000'+ level.  Depending on the ascent rate, as the balloon passes through the jet stream (~30-000 - 35,000 ?  Bruce ?), it will move a significant distance; typically eastward. Once through the jet stream, it will tend to "stay put."  

73 Donn
WA2VOI/0

> -----Original Message-----
> From: nlrs-bounces at mailman.qth.net
> [mailto:nlrs-bounces at mailman.qth.net]On Behalf Of jcplatt1 at mmm.com
> Sent: Monday, August 22, 2005 9:39 AM
> To: Glen Overby
> Cc: nlrs at mailman.qth.net
> Subject: Re: [NLRS] ND Baloon Launch - August 27th
> 
> 
> 
> 
> Valley City, ND,  appears to be about 1/2 way between 
> Jamestown and Fargo,
> ND.   The heart of downtown is EN06xw.    From Bloomington, MN,  the
> bearing would be 305 degrees at 271 miles.
> 
> My 2m yagi at 50' has its first peak at 2 degrees and its 
> first null at 3.9
> degrees elevation.    Will the balloon rise high enough to be 
> into my first
> null ?    On 432 its three times "worse" with the first main 
> peak at around
> 0.7 degrees and the first null at 1.3 degrees .... again, 
> will the balloon
> rise high enough at that distance to get into my first null ?
> 
> Do they have an expectation as to how high "high" is, what time we may
> expect to hear it at 271 miles distance (yes, I know there are LOTS of
> variables, but a prediction would be nice), and for how long ?
> 
> 73, Jon
> W0ZQ
> 
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