Alert archive / Colorado / Freeze Warnings in 2021
Freeze Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this freeze warning at Oct 13, 2021, 2:50 PM MDT for Arapahoe County, Douglas County, Elbert County, Colorado. It took effect at Oct 14, 2021, 2:00 AM MDT. It was in force for 6 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 13, 2021, 2:50 PM MDT (20:50 UTC)
- In effect from
- Oct 14, 2021, 2:00 AM MDT
- Expired
- Oct 14, 2021, 7:55 AM MDT
- In force
- 6 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Arapahoe County, CO, Douglas County, CO, Elbert County, CO
The radar
The Denver radar (KFTG), 41 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 117 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
- 1982 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
371 WWUS75 KBOU 132050 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver/Boulder CO 250 PM MDT Wed Oct 13 2021 COZ042-048-050-051-132200- /O.CAN.KBOU.HW.W.0006.000000T0000Z-211014T0000Z/ Northeast Weld County-Logan County-Sedgwick County- Phillips County- Including Briggsdale, Grover, Pawnee Buttes, Raymer, Stoneham, Crook, Merino, Sterling, Peetz, Julesburg, Ovid, Sedgwick, Amherst, Haxtun, and Holyoke 250 PM MDT Wed Oct 13 2021 ...HIGH WIND WARNING IS CANCELLED... Winds have dropped below High Wind Warning criteria this afternoon and will only get weaker as the day progresses towards sunset. The High Wind Warning has been cancelled. $$ COZ041-140500- /O.NEW.KBOU.FZ.W.0002.211014T0800Z-211014T1500Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including Castle Rock, Elbert, Fondis, Kiowa, and Larkspur 250 PM MDT Wed Oct 13 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM MDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Palmer Divide including Castle Rock, Elbert, and Larkspur. * WHEN...From 2 AM to 9 AM MDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
4 follow-up statements
578 WWUS75 KBOU 132240 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 440 PM MDT Wed Oct 13 2021 COZ041-140400- /O.CON.KBOU.FZ.W.0002.211014T0800Z-211014T1500Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 440 PM MDT Wed Oct 13 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM MDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Palmer Divide including Castle Rock, Elbert, and Larkspur. * WHEN...From 2 AM to 9 AM MDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ COZ038>040-042>045-048>051-140400- /O.NEW.KBOU.FR.Y.0003.211014T0800Z-211014T1500Z/ Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 440 PM MDT Wed Oct 13 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM MDT THURSDAY... * WHAT...Low temperatures between 33 and 36 degrees will result in frost formation. * WHERE...Plains of north central and northeast Colorado. * WHEN...From 2 AM to 9 AM MDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Rodriguez
387 WWUS75 KBOU 140324 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 924 PM MDT Wed Oct 13 2021 COZ041-141200- /O.CON.KBOU.FZ.W.0002.211014T0800Z-211014T1500Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 924 PM MDT Wed Oct 13 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM MDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Palmer Divide including Castle Rock, Elbert, and Larkspur. * WHEN...From 2 AM to 9 AM MDT Thursday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ COZ038>040-042>045-048>051-141200- /O.CON.KBOU.FR.Y.0003.211014T0800Z-211014T1500Z/ Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Northeast Weld County-Central and South Weld County-Morgan County-Central and East Adams and Arapahoe Counties-Logan County-Washington County-Sedgwick County- Phillips County- Including the cities of Wiggins, Pawnee Buttes, Roggen, Arvada, Byers, Julesburg, Briggsdale, Leader, Boulder, Fort Morgan, City of Denver, Cope, Aurora, Littleton, Amherst, Akron, Last Chance, Raymer, Brighton, Sterling, Highlands Ranch, Fort Lupton, Ovid, Loveland, Peetz, Grover, Eaton, Deer Trail, Longmont, Sedgwick, Denver International Airport, Haxtun, Goodrich, Golden, Parker, Lakewood, Stoneham, Fort Collins, Greeley, Bennett, Otis, Crook, Holyoke, Nunn, Brush, Hereford, and Merino 924 PM MDT Wed Oct 13 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM MDT THURSDAY... * WHAT...Low temperatures between 33 and 36 degrees will result in frost formation. * WHERE...Plains of north central and northeast Colorado. * WHEN...From 2 AM to 9 AM MDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Rodriguez
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
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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 12, 9:53 PM MDT | Freeze Warning | BOU | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more | 10 hr |
| Oct 13, 4:40 PM MDT | Frost Advisory | BOU | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more | 15 hr |
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.