Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 112, NWS Cheyenne, WY

July 29, 2021Albany County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 29, 2021, 3:52 PM MDT for Albany County, Wyoming. It was in force for 38 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: Jul 29, 2021, 3:52 PM MDT (21:52 UTC)
Expired: Jul 29, 2021, 4:30 PM MDT
In force: 38 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 99 km from the middle of the area, began a volume at 21:55 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, 9.9 hours before the alert went out and 272 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2 J/kg
Mixed-layer CIN: -369 J/kg
Mixed-layer LCL: 2462 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

330 
WUUS55 KCYS 292152
SVRCYS
WYC001-292230-
/O.NEW.KCYS.SV.W.0112.210729T2152Z-210729T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
352 PM MDT Thu Jul 29 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  South central Albany County in southeastern Wyoming...

* Until 430 PM MDT.

* At 352 PM MDT, a severe thunderstorm was located near Lake Owen
  Campground, or 24 miles west of Laramie, moving southeast at 15
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Albany, Woods Landing-Jelm, Lake Owen Campground, Lake Hattie
  Reservoir, Woods Landing, Lake Owen and Hutton Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Cheyenne.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4117 10613 4128 10606 4121 10567 4099 10592
      4099 10599
TIME...MOT...LOC 2152Z 316DEG 14KT 4119 10603 

HAIL...1.00IN
WIND...60MPH
 
$$

Claycomb

1 follow-up statement

014 
WWUS55 KCYS 292222
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
422 PM MDT Thu Jul 29 2021

WYC001-292232-
/O.EXP.KCYS.SV.W.0112.000000T0000Z-210729T2230Z/
Albany WY-
422 PM MDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ALBANY COUNTY
WILL EXPIRE AT 430 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and heavy rain are still possible with this thunderstorm.

LAT...LON 4117 10613 4128 10606 4121 10567 4099 10592
      4099 10599
TIME...MOT...LOC 2222Z 316DEG 14KT 4112 10594 

$$

Cox

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 2:01 PM MDT	Flash Flood Watch	CYS	Albany, Carbon, Converse, Goshen, Laramie, Platte	34 hr
Jul 29, 2:23 PM MDT	Flash Flood Warning	CYS	Albany, Carbon	101 min
Jul 29, 2:27 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	48 min
Jul 29, 3:12 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	48 min
Jul 29, 3:19 PM MDT	Flash Flood Warning	CYS	Albany, Carbon	104 min
Jul 29, 4:41 PM MDT	Areal Flood Advisory	CYS	Albany	3 hr

Nearby

Severe Thunderstorm Warnings in Wyoming, 2021 Every severe thunderstorm 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.