Alert archive / Colorado / Frost Advisories in 2021
Frost Advisory 1, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this frost advisory at Sep 21, 2021, 2:07 PM MDT for 6 counties in Colorado. It took effect at Sep 22, 2021, 2:00 AM MDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Sep 21, 2021, 2:07 PM MDT (20:07 UTC)
- In effect from
- Sep 22, 2021, 2:00 AM MDT
- Expired
- Sep 22, 2021, 8:00 AM MDT
- In force
- 6 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Elbert County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 52 km from the middle of the area, began a volume at 20:08 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 75 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1008 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
801 WWUS75 KBOU 212007 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver/Boulder CO 207 PM MDT Tue Sep 21 2021 COZ038-042-043-046-047-220400- /O.NEW.KBOU.FR.Y.0001.210922T0800Z-210922T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Including Fort Collins, Hereford, Loveland, Nunn, Briggsdale, Grover, Pawnee Buttes, Raymer, Stoneham, Eaton, Fort Lupton, Greeley, Roggen, Agate, Hugo, Limon, Matheson, Forder, Karval, Kutch, and Punkin Center 207 PM MDT Tue Sep 21 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM MDT WEDNESDAY... * WHAT...Temperatures expected to drop into the 34 to 36 degree range with frost possible. * WHERE...Weld County and Lincoln County. * WHEN...From 2 AM to 8 AM MDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Rodriguez
3 follow-up statements
172 WWUS75 KBOU 220341 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 941 PM MDT Tue Sep 21 2021 COZ038-042-043-046-047-221400- /O.CON.KBOU.FR.Y.0001.210922T0800Z-210922T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County- Including the cities of Fort Lupton, Pawnee Buttes, Stoneham, Fort Collins, Greeley, Hugo, Roggen, Matheson, Grover, Loveland, Limon, Nunn, Eaton, Agate, Briggsdale, Hereford, Forder, Punkin Center, Kutch, Karval, and Raymer 941 PM MDT Tue Sep 21 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 8 AM MDT WEDNESDAY... * WHAT...Temperatures as low as 36 will result in frost formation. * WHERE...North and Northeast Elbert County Below 6000 Feet/North Lincoln County, Southeast Elbert County Below 6000 Feet/South Lincoln County, Larimer County Below 6000 Feet/Northwest Weld County, Central and South Weld County and Northeast Weld County Counties. * WHEN...From 2 AM to 8 AM MDT Wednesday. $$ For more information from the National Weather Service, visit https://weather.gov/bou Direnzo
936 WWUS75 KBOU 220847 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 247 AM MDT Wed Sep 22 2021 COZ044-048-221400- /O.EXA.KBOU.FR.Y.0001.000000T0000Z-210922T1400Z/ Morgan County-Logan County- Including the cities of Sterling, Wiggins, Goodrich, Fort Morgan, Peetz, Crook, Brush, and Merino 247 AM MDT Wed Sep 22 2021 ...FROST ADVISORY IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Logan County and Morgan County Counties. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ COZ038-042-043-046-047-221400- /O.CON.KBOU.FR.Y.0001.000000T0000Z-210922T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County- Including the cities of Fort Lupton, Pawnee Buttes, Stoneham, Fort Collins, Greeley, Hugo, Roggen, Matheson, Grover, Loveland, Limon, Nunn, Eaton, Agate, Briggsdale, Hereford, Forder, Punkin Center, Kutch, Karval, and Raymer 247 AM MDT Wed Sep 22 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM MDT THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...North and Northeast Elbert County Below 6000 Feet/North Lincoln County, Southeast Elbert County Below 6000 Feet/South Lincoln County, Larimer County Below 6000 Feet/Northwest Weld County, Central and South Weld County and Northeast Weld County Counties. * WHEN...Until 8 AM MDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Direnzo
491 WWUS75 KBOU 221346 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 746 AM MDT Wed Sep 22 2021 COZ038-042>044-046>048-221500- /O.EXP.KBOU.FR.Y.0001.000000T0000Z-210922T1400Z/ Larimer County Below 6000 Feet/Northwest Weld County-Northeast Weld County-Central and South Weld County-Morgan County-North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County- Including the cities of Wiggins, Fort Morgan, Hugo, Roggen, Forder, Briggsdale, Sterling, Pawnee Buttes, Crook, Raymer, Fort Lupton, Matheson, Loveland, Peetz, Grover, Eaton, Agate, Kutch, Goodrich, Stoneham, Fort Collins, Greeley, Punkin Center, Nunn, Brush, Karval, Limon, Hereford, and Merino 746 AM MDT Wed Sep 22 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM MDT THIS MORNING... The threat has ended. $$ For more information from the National Weather Service, visit https://weather.gov/bou Rodriguez
Nearby
Frost Advisories in Colorado, 2021Every frost advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.