Alert archive / Colorado / Freeze Warnings in 2021
Freeze Warning 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this freeze warning at Oct 14, 2021, 3:01 AM MDT for 14 counties in Colorado. It took effect at Oct 15, 2021, 12:00 AM MDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 14, 2021, 3:01 AM MDT (09:01 UTC)
- In effect from
- Oct 15, 2021, 12:00 AM MDT
- Expired
- Oct 15, 2021, 9:00 AM MDT
- In force
- 9 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Jefferson County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 49 km from the middle of the area, began a volume at 09:02 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 00:00Z, 9.0 hours before the alert went out and 88 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
- 2618 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
267 WWUS75 KBOU 140901 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 301 AM MDT Thu Oct 14 2021 COZ038>040-042>045-048>051-141800- /O.NEW.KBOU.FZ.W.0003.211015T0600Z-211015T1500Z/ /O.CON.KBOU.FR.Y.0003.000000T0000Z-211014T1500Z/ 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-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 301 AM MDT Thu Oct 14 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT FRIDAY... * WHAT...Frost is expected this morning. A Freeze is expected tonight with lows in the upper 20s. * WHERE...Portions of north central and northeast Colorado. * WHEN...For the Freeze Warning, from Midnight tonight to 9 AM MDT Friday. For the Frost Advisory, until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ COZ041-141500- /O.CON.KBOU.FZ.W.0002.000000T0000Z-211014T1500Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 301 AM MDT Thu Oct 14 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 28 ongoing. * WHERE...Elbert/Central and East Douglas Counties Above 6000 Feet County. * WHEN...Until 9 AM MDT this morning. $$ For more information from the National Weather Service, visit https://weather.gov/bou Hiris
3 follow-up statements
719 WWUS75 KBOU 141355 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 755 AM MDT Thu Oct 14 2021 COZ041-141500- /O.CAN.KBOU.FZ.W.0002.000000T0000Z-211014T1500Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 755 AM MDT Thu Oct 14 2021 ...FREEZE WARNING IS CANCELLED... Temperatures have warmed into the mid 30s. Given the hard freeze that has occurred, we will not issue any more frost/freeze products for Douglas and Elbert Counties this Fall. $$ COZ038>040-042>045-048>051-150400- /O.CAN.KBOU.FR.Y.0003.000000T0000Z-211014T1500Z/ /O.CON.KBOU.FZ.W.0003.211015T0600Z-211015T1500Z/ Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 755 AM MDT Thu Oct 14 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM MDT FRIDAY... ...FROST ADVISORY FOR THIS MORNING IS CANCELLED... * WHAT...A Freeze is expected tonight with lows in the upper 20s. * WHERE...Portions of north central and northeast Colorado. * WHEN...From Midnight tonight to 9 AM MDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Schlatter
522 WWUS75 KBOU 150428 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 1028 PM MDT Thu Oct 14 2021 COZ038>040-042>045-048>051-151200- /O.CON.KBOU.FZ.W.0003.211015T0600Z-211015T1500Z/ 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-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 1028 PM MDT Thu Oct 14 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT FRIDAY... * WHAT...A Freeze is expected tonight with lows in the upper 20s. * WHERE...Portions of north central and northeast Colorado. * WHEN...Until 9 AM MDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Hiris
974 WWUS75 KBOU 151158 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 558 AM MDT Fri Oct 15 2021 COZ038>040-042>045-048>051-151500- /O.CON.KBOU.FZ.W.0003.000000T0000Z-211015T1500Z/ Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 558 AM MDT Fri Oct 15 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... * WHAT...A Freeze is expected tonight with lows in the upper 20s. * WHERE...Portions of north central and northeast Colorado. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Hiris
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 14, 4:08 PM MDT | Special Weather Statement | BOU | Elbert | 37 min |
Nearby
Freeze Warnings in Colorado, 2021Every freeze warning 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.