Strong to severe thunderstorms will continue through tonight across portions of the Southeast and Southwest Texas. Large hail and strong winds will be the primary threats. Heavy to excessive rainfall may lead to scattered instances of flash flooding in these regions tonight. Read More >
Billings, MT
Weather Forecast Office
Smoke dispersal is categorized by using the Ventilation Rate. Ventilation Rate forecasts for a specific point can be found using the Fire Weather Dashboard. Click a spot on the map and scroll down to find daily and hourly Ventilation Rate values for the next few days.
The link above is configured to display smoke dispersal categories as shown here:
| Smoke Dispersal | Vent. Rate, knot-feet (x1000) | |
|---|---|---|
| Excellent | 150 or greater | |
| Very Good | 100 to 149.99 | |
| Good | 60 to 99.99 | |
| Fair | 40 to 59.99 | |
| Poor | less than 40 |
Ventilation Rate = Transport Wind (kts) x Mixing Height (ft)
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Billings, MT
2170 Overland Ave
Billings, MT 59102-6455
(406) 652-0851
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