Alert archive / Wyoming / Special Weather Statements in 2020

Special Weather Statement, NWS Cheyenne, WY

August 5, 2020Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Aug 5, 2020, 12:21 AM MDT for Laramie County, Wyoming. It was in force for 24 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
Aug 5, 2020, 12:21 AM MDT (06:21 UTC)
Expired
Aug 5, 2020, 12:45 AM MDT
In force
24 min
Issued by
NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 36 km from the middle of the area, began a volume at 06:24 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, 6.4 hours before the alert went out and 217 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 2020-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 717 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2020-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.193958Sfc1 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
717 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
2906 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
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.5

Open this sounding in Storm Lab

The text

As transmitted.

177 
WWUS85 KCYS 050621
SPSCYS

Special Weather Statement
National Weather Service Cheyenne WY
1221 AM MDT Wed Aug 5 2020

WYZ108-117>119-050645-
Goshen County-Central Laramie County-South Laramie Range
Foothills-East Laramie County-
1221 AM MDT Wed Aug 5 2020

...GUSTY WINDS WITH SHOWERS WILL AFFECT FAR SOUTHWESTERN GOSHEN AND 
NORTH CENTRAL LARAMIE COUNTIES...

At 1218 AM MDT, showers were located over northern Laramie county 
around Whitaker, or 26 miles north of Cheyenne, moving east at 30 
mph.

Wind gusts up to 50 mph are occurring with these showers.

Locations impacted include...
Whitaker.

This includes Interstate 25 in Wyoming between mile markers 28 and
46.
 
LAT...LON 4139 10494 4164 10487 4160 10435 4131 10443
TIME...MOT...LOC 0618Z 287DEG 25KT 4152 10478 

$$

Emanuel

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 6:17 PM MDTSpecial Weather StatementCYSAlbany43 min
Aug 4, 6:34 PM MDTSpecial Weather StatementCYS41 min
Aug 4, 7:00 PM MDTSpecial Weather StatementCYSAlbany45 min
Aug 4, 7:42 PM MDTSpecial Weather StatementCYS33 min
Aug 4, 7:59 PM MDTSpecial Weather StatementCYSCarbon46 min
Aug 4, 8:45 PM MDTSpecial Weather StatementCYSAlbany45 min
Aug 4, 9:28 PM MDTSpecial Weather StatementCYSAlbany, Platte47 min
Aug 4, 10:50 PM MDTSpecial Weather StatementCYSGoshen, Laramie, Platte40 min
Aug 4, 11:31 PM MDTSpecial Weather StatementCYSGoshen44 min
Aug 5, 2:50 AM MDTRed Flag WarningCYS41 hr
Aug 5, 1:23 PM MDTSpecial Weather StatementCYSLaramie52 min
Aug 5, 1:59 PM MDTSpecial Weather StatementCYSLaramie46 min
Aug 5, 2:05 PM MDTSpecial Weather StatementCYSConverse40 min
Aug 5, 2:27 PM MDTSpecial Weather StatementCYSLaramie48 min
Aug 5, 2:34 PM MDTFire Weather WatchCYS13 hr
Aug 5, 2:45 PM MDTSpecial Weather StatementCYSPlatte45 min
Aug 5, 2:53 PM MDTSpecial Weather StatementCYSPlatte52 min
Aug 5, 3:03 PM MDTSpecial Weather StatementCYS42 min
Aug 5, 3:16 PM MDTSpecial Weather StatementCYSLaramie44 min
Aug 5, 3:42 PM MDTSpecial Weather StatementCYSAlbany48 min
Aug 5, 3:57 PM MDTSpecial Weather StatementCYSConverse48 min
Aug 5, 4:07 PM MDTSpecial Weather StatementCYSPlatte38 min
Aug 5, 4:22 PM MDTSpecial Weather StatementCYSConverse38 min
Aug 5, 4:34 PM MDTSevere Thunderstorm WarningCYSConverse28 min
Aug 5, 4:50 PM MDTSpecial Weather StatementCYSConverse40 min
Aug 5, 4:52 PM MDTSpecial Weather StatementCYSLaramie38 min
Aug 5, 4:58 PM MDTSpecial Weather StatementCYSPlatte47 min
Aug 5, 5:01 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte44 min
Aug 5, 5:19 PM MDTSpecial Weather StatementCYSConverse41 min
Aug 5, 5:21 PM MDTSpecial Weather StatementCYSGoshen39 min
Aug 5, 5:34 PM MDTSpecial Weather StatementCYSPlatte41 min
Aug 5, 5:41 PM MDTSpecial Weather StatementCYSNiobrara49 min
Aug 5, 12:15 AM MDTSpecial Weather StatementCYSBanner, Kimball60 min
Aug 5, 3:50 PM MDTSpecial Weather StatementCYSBox Butte40 min
Aug 5, 3:59 PM MDTSpecial Weather StatementCYSSioux46 min
Aug 5, 4:32 PM MDTSevere Thunderstorm WarningCYSSioux43 min
Aug 5, 4:55 PM MDTSpecial Weather StatementCYSSioux50 min
Aug 5, 5:31 PM MDTSpecial Weather StatementCYSMorrill44 min

Nearby

Special Weather Statements in Wyoming, 2020Every special weather statement in 2020

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.