Alert archive / Colorado / Winter Weather Advisories in 2021
Winter Weather Advisory 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter weather advisory at Mar 23, 2021, 9:11 PM MDT for Arapahoe County, Douglas County, Elbert County, Colorado. It took effect at Mar 23, 2021, 10:00 PM MDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Mar 23, 2021, 9:11 PM MDT (03:11 UTC)
- In effect from
- Mar 23, 2021, 10:00 PM MDT
- Expired
- Mar 24, 2021, 8:06 AM MDT
- In force
- 10 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Arapahoe County, CO, Douglas County, CO, Elbert County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.2 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
- 1015 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -47 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
673 WWUS45 KBOU 240311 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 911 PM MDT Tue Mar 23 2021 ...SNOW OVERNIGHT INTO WEDNESDAY MORNING... .Northerly winds creating upslope flow along the Palmer Divide along with localized heavier snow showers will create hazardous driving conditions for the morning commute. COZ041-241200- /O.NEW.KBOU.WW.Y.0021.210324T0400Z-210324T1600Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 911 PM MDT Tue Mar 23 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 AM MDT WEDNESDAY... * WHAT...Snow expected. Total snow accumulations up to 3 inches, with locally higher amounts possible. * WHERE...Castle Rock south towards Monument. Highest amounts along the I-25 corridor near the Palmer Divide. * WHEN...Until 10 AM MDT Wednesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Wednesday morning commute. Roads will likely become slick and hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Kriederman
2 follow-up statements
731 WWUS45 KBOU 241039 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 439 AM MDT Wed Mar 24 2021 ...SNOW THIS MORNING... .Northerly winds are still upsloping over the Palmer Divide and driving lingering snow showers, accumulated snow will create hazardous driving conditions for the morning commute. COZ041-241600- /O.CON.KBOU.WW.Y.0021.000000T0000Z-210324T1600Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 439 AM MDT Wed Mar 24 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Total snow accumulations up to 3 inches, with locally higher amounts possible. * WHERE...Castle Rock. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Wednesday morning commute. Roads will likely become slick and hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Direnzo
051 WWUS45 KBOU 241406 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 806 AM MDT Wed Mar 24 2021 COZ041-241515- /O.CAN.KBOU.WW.Y.0021.000000T0000Z-210324T1600Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Elbert, Fondis, Kiowa, Castle Rock, and Larkspur 806 AM MDT Wed Mar 24 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Snow has decreased to flurries and road conditions are improving. There may still be some patchy slush or ice on some roads this morning. $$ For more information from the National Weather Service, visit https://weather.gov/bou Gimmestad
Nearby
Winter Weather Advisories in Colorado, 2021Every winter weather 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.