Local Weather Links

Regional Weather map Local Weather Forecast
CO State Weather Round Up  Winds at Ward—9 miles NW of NBR @9,000′
Jet Stream Map  Winds Sugar Loaf—3 miles SW of NBR @7,000′
 Local NOAA radio Winds at North Boulder Ridge—6,500′
Rocky Mountain Region Winds Aloft  —->easier  Denver/Boulder Forecast Discussion
Denver/Boulder Thermal soaring forecast  Winds at NCAR Table Mesa—5 miles south 400′ below NBR
North Boulder Ridge… Temp: 42.8 F Wind MPH: 6, Wind Direction: ENE, Wind Gust MPH: 9.0
Pressure Difference: -0.37 in (Boulder-Eagle)

Granger’s Weather wisdom:

NBRis a weather station above launch on the ridge.

High winds aloft—if the winds aloft over Denver at 9,000′ or 12,000′ are more than 20 knots, flying on the front range can be hazardous. “2318” means 230 degrees at 18 knots. When the inversion breaks, rotor and strong, turbulent winds descend! Check the winds above Boulder to warn you of approach.

Front Range Pressure Difference.This is the difference in barometric pressure between Boulder and Eagle Airports. These weather stations are at the same altitude and opposite sides of the divide. Although there are other factors, the lower the front range pressure at Boulder airport becomes, the more likely west or tail winds become at our flying areas on the front range. A pressure difference reading in the range -.18 — -.30″ assures us of west winds!

Shifting winds—You will experience shifting winds—-from the North and then from the South—before they become catabatic or downslope winds.
Lee trough
A “lee trough” is one and the same thing as a “dynamic trough”. According to the AMS Glossary, it is “A pressure trough formed on the lee side of a mountain range in situations where the wind is blowing with a substantial component across the mountain ridge; often seen on United States weather maps east of the Rocky Mountains and can be formed either as a result of the adiabatic compression of sinking air on the “lee” side of a mountain range, or through cyclogenesis resulting from “the horizontal convergence associated with vertical stretching of air columns passing over the ridge and descending the lee slope.

12 thoughts on “Local Weather Links

    • Niels we can’t use the old Flash header, as it doesn’t work for some mobile devices and the new Wunderground API is more stable than the old parsing technology Parasoft used. The new Wunderground weather widget (see site footer) is an evolving weather widget, and your suggestions will be appreciated.

  1. Niels,
    Take a look front rage pressure gradient on the footer of each page.
    We are now comparing NBR with western slope airport of Eagle since they are both the same altitude and closer then the last comparison points of DIA and Grand Junction. As we use these new points, I will publish my thoughts about which pressure gradient are significant and which have no effect.

  2. Weather outlook for Saturday 1/1/12
    Winds aloft light but Niwot Ridge showing strong westerly gusts at surface. New pressure gradient showing positive +1.4″ but old showing 0. Take some time to get used to new pressure gradient. NOAA weather calling for light snow this PM, up slope flow?

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