Alert archive / Colorado / Special Weather Statements in 2021

Special Weather Statement, NWS Denver/Boulder, CO

February 3, 2021Elbert County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at Feb 3, 2021, 10:39 PM MST for Elbert County, Colorado. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Feb 3, 2021, 10:39 PM MST (05:39 UTC)
Expired
Feb 3, 2021, 11:15 PM MST
In force
36 min
Issued by
NWS Denver/Boulder, CO

County Elbert County, CO

The radar

The Denver radar (KFTG), 73 km from the middle of the area, began a volume at 05:42 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, 5.7 hours before the alert went out and 119 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2021-02-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2021-02-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939587897117136156Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1997 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

913 
WWUS85 KBOU 040539
SPSBOU

Special Weather Statement
National Weather Service Denver CO
1039 PM MST Wed Feb 3 2021
 
COZ036-041-046-040615-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
Jefferson and West Douglas Counties Above  6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet CO-
1039 PM MST Wed Feb 3 2021

...Heavy snow band moving across southern Douglas and southern 
Elbert counties...

At 1035 PM MST, Doppler radar was tracking a band of heavy snow 
across southern portions of Douglas and Elbert counties.  Snowfall 
rates up to 2 inches per hour will accompany this band of snow as it 
continues to move southeast.  Roads will quickly become icy and 
snowpacked as this band of snow moves across with hazardous driving 
conditions.  In addition visibility will be reduced in blowing snow.

Locations impacted include... Elbert, Simla, Larkspur, Westcreek, 
Perry Park, Devil's Head, Matheson and Greenland.

LAT...LON 3913 10406 3913 10518 3931 10518 3932 10384
      3910 10388 3909 10391 3909 10405
TIME...MOT...LOC 0530Z 338DEG 13KT 3916 10467 

$$

RPK

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 3, 8:44 PM MSTSpecial Weather StatementBOUArapahoe, Douglas, Elbert46 min
Feb 3, 9:38 PM MSTSpecial Weather StatementBOUDouglas, Elbert52 min
Feb 4, 3:30 AM MSTWinter Storm WarningBOUGrand, Jackson50 hr
Feb 4, 2:39 PM MSTWinter Weather AdvisoryBOUBoulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more38 hr

Nearby

Special Weather Statements in Colorado, 2021Every special weather statement 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.