A dry microburst early in the morning caused extensive damage at the Limon Municipal Airport. Several hangars were damaged and one was destroyed.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOU wrote it up.
A dry microburst early in the morning caused extensive damage at the Limon Municipal Airport. Several hangars were damaged and one was destroyed. The wind reached 67 mph and the temperature at the airport jumped 14 degrees, from 68 to 82.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before the first event at Aug 9, 7:31 PM MST, 5 hours 55 minutes earlier.
Area Forecast Discussion National Weather Service Denver/Boulder CO 831 PM MDT Sun Aug 9 2020 .UPDATE... Issued at 831 PM MDT Sun Aug 9 2020 No reason to make any changes to the forecast at this time. Temperatures are gradually cooling off after the record tying high temperature earlier this afternoon. Radar imagery shows a variety of outflow boundaries from out-of-state convection moving over the plains. However the airmass is too stable to support any convection, so the boundaries will eventually just run out of steam and become ill-defined overnight. Short range models continue to indicate a surge of cooler but dry air moving across the plains through tomorrow. Ten to 15 degrees of cooling should result from this with some showers developing along the foothills late tomorrow afternoon. && .SHORT TERM...(This evening through Monday) Issued at 220 PM MDT Sun Aug 9 2020 Convective cloudiness has been developing slowly early this afternoon. The best batch is in and around the Palmer Divide. Observations are showing very low dew points across all but the far northeast corner of the CWA. Values are mostly in the teens and 20 F, but out in the corner, there are some 50s F. The smoke from the fire upstream in Garfield County is still quite prevalent on the satellite pictures. Models have a weak upper trough move across the CWA overnight. There is some weak northwesterly flow aloft Monday, in the morning, then is goes back to weak west-southwesterly jet level flow by Monday late day. There is actually a weak QG couplet of synoptic scale energy with the overnight trough. Weak subsidence is in place over the plains much of Monday. That trough brings a cold front into the plains after 09Z Monday morning early. It doesn't get very high up into the foothills. There will be an easterly component to the low levels winds over the plains all day Monday. For moisture, it does increase a bit behind the front. Dew point readings supposedly come up and are progged into the 50s F for all the plains on Monday. There is pretty decent CAPE over the foothills and immediate plains Monday afternoon. However, cross section of lapse rates and forecast soundings show a decent inversion over the plains all day Monday; it is pretty capped. For pops, will go with 10-30%s, highest in the foothills, nothing over the eastern plains. For temperatures, Monday's highs over the plains are down 4-8 C from today's highs. The mountains have similar readings to today's values. .LONG TERM...(Monday night through Sunday) Issued at 1224 PM MDT Sun Aug 9 2020 For Monday night, Northern Colorado will still be in a post frontal regime across the plains with a shallow east to southeast low level flow. Airmass will still remain capped over the plains with residual stability around 750mb. Could see some isolated showers/thunderstorm activity over the mountains/higher terrain and east slopes with some weak convergent flow and weak instability. Will keep low pops in these areas but remove any chances for storms across the far northeast plains. For Tuesday, temperatures will warm again well into the 90s across the plains as 700mb temperatures rise back to around +17c. There will be a better chance for a thunderstorm over the far eastern plains of Colorado with a dry line set up with 50+ dewpoints over the far plains and CAPE values of 2000-3000j/kg. SPC has much of far eastern Colorado under marginal risk for severe and this looks ok considering the high CAPE. Low level shear not bad but mid level flow only around 15kt which is why only the marginal category. A similar setup for Wednesday with again a dry line set up somewhere over the far northeast plains of Colorado which would be the main area for a slight chance for a storm with high CAPE values over 2000j/kg. Airmass likely will be too dry further west over the urban corridor and mountains. Temperatures again will continue hot with readings in the 90s. For later in the week and through the weekend the broad high pressure ridge aloft will build westward into the desert southwest this weekend and finally across the Great Basin towards early next week with a developing northwest flow. This may begin to feed higher low level moisture from the east. Still however overall coverage for storms still looks to be isolated across Northern Colorado. For the fire weather community, expect elevated fire danger continuing for much of the next week with low humidities but overall wind strength will be on the lighter side. & .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 225 PM MDT Sun Aug 9 2020 Wind directions are all over the place at DIA this afternoon. Some of models showed that. Eventually, some version of weak drainage wind can be expected at DIA. There is still a cold front expected around 10Z early Monday, with weak easterly upslope flow indicated all day Monday. Some of the models hint at a tad of low Stratus behind the front from about 12-15Z Monday morning. I don't buy it right now, but will brief next shift on its potential. Pops are not expected this afternoon or tonight, and an outside chance, 10% at best, for late Monday afternoon. && .AVIATION...(For the 00Z TAFS through 00Z Monday evening) Issued at 831 PM MDT Sun Aug 9 2020 No aviation impacts expected tonight. Winds should be pretty light overnight with skies eventually becoming mostly clear. The main story for tomorrow will be the persistent easterly winds in the wake of a weak and dry cold front that will arrive by mid to late morning. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && UPDATE...Dankers SHORT TERM...RJK LONG TERM....Entrekin AVIATION...Dankers
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1116 AM MDT Sun Aug 9 2020 COZ030>051-101730- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1116 AM MDT Sun Aug 9 2020 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...This Afternoon and Tonight It will continue to be hot and dry today. There may be some hazy conditions north of the Greater Denver area from a forecast fire burning in western Colorado. The fire danger will be elevated to high in the northern mountains. .DAYS TWO THROUGH SEVEN...Monday through Saturday Hot and generally dry weather will continue through next week. The best chance thunderstorms each afternoon and evening will be over the mountains and over the far eastern plains, but most areas will remain dry. There will be a marginal risk of severe thunderstorms over the northeast plains Tuesday afternoon. One or two storms could produce hail up to one inch and wind gusts to 60 mph. The fire danger will be elevated through the period due above normal temperatures and mostly dry conditions. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
The Denver radar (KFTG), 95 km away, was scanning. The volume nearest the first event began at 08:26 UTC.
1 thunderstorm wind. Local standard time, as filed.
Damaging winds from a dry microburst struck Limon Municipal Airport. Several hangars were damaged and one was destroyed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2020Every state in 2020This day in weather historyWarnings in Colorado, August 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 929157.