Alert archive / Wyoming / Special Weather Statements in 2015

Special Weather Statement, NWS Cheyenne, WY

June 7, 2015Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jun 7, 2015, 1:08 AM MDT for Laramie County, Wyoming. It was in force for 37 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: Jun 7, 2015, 1:08 AM MDT (07:08 UTC)
Expired: Jun 7, 2015, 1:45 AM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 14 km from the middle of the area, began a volume at 07:09 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 (KDEN), launched 00:00Z, 7.1 hours before the alert went out and 185 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: 33 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 1769 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

942 
WWUS85 KCYS 070708
SPSCYS

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
108 AM MDT SUN JUN 7 2015
 
WYZ117>119-070745-
SOUTH LARAMIE RANGE FOOTHILLS WY-CENTRAL LARAMIE COUNTY WY-
EAST LARAMIE COUNTY WY-
108 AM MDT SUN JUN 7 2015

...SPECIAL WEATHER STATEMENT...

AT 108 AM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
CHEYENNE...MOVING NORTHEAST AT 25 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CHEYENNE...HILLSDALE...RANCHETTES AND FOX FARM-COLLEGE. 

THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 365 AND
381.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4134 10465 4122 10437 4100 10460 4099 10471
      4100 10483
TIME...MOT...LOC 0708Z 216DEG 22KT 4113 10467 

$$

MAZUR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 6:45 PM MDT	Special Weather Statement	CYS	Laramie	45 min
Jun 6, 7:20 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	55 min
Jun 6, 8:37 PM MDT	River Flood Warning	CYS	Goshen	7 days
Jun 7, 1:04 AM MDT	Special Weather Statement	CYS	Platte	26 min
Jun 7, 2:19 PM MDT	Special Weather Statement	CYS	Laramie	41 min
Jun 7, 3:45 PM MDT	Special Weather Statement	CYS	Laramie	45 min
Jun 7, 3:49 PM MDT	Special Weather Statement	CYS	Goshen	41 min
Jun 6, 6:03 PM MDT	Special Weather Statement	CYS	Dawes	42 min
Jun 6, 6:19 PM MDT	Special Weather Statement	CYS	Dawes	41 min
Jun 6, 6:20 PM MDT	Special Weather Statement	CYS	Box Butte	40 min
Jun 6, 6:51 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	31 min
Jun 6, 7:11 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	25 min
Jun 6, 7:29 PM MDT	Special Weather Statement	CYS	Sioux	46 min
Jun 6, 8:18 PM MDT	Special Weather Statement	CYS	Dawes	42 min
Jun 6, 8:55 PM MDT	Special Weather Statement	CYS	Dawes	50 min
Jun 7, 11:37 AM MDT	Areal Flood Warning	CYS	Dawes	24 hr
Jun 7, 2:28 PM MDT	Special Weather Statement	CYS	Cheyenne	47 min
Jun 7, 5:07 PM MDT	Special Weather Statement	CYS	Morrill	38 min

Nearby

Special Weather Statements in Wyoming, 2015 Every special weather statement in 2015

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.