Alert archive / Wyoming / Blizzard Watches in 2015

Blizzard Watch 1, NWS Riverton, WY

April 14, 2015Johnson County, Wyoming

NWS Riverton, WY issued this blizzard watch at Apr 14, 2015, 5:04 AM MDT for Johnson County, Wyoming. It took effect at Apr 15, 2015, 3:00 AM MDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 14, 2015, 5:04 AM MDT (11:04 UTC)
In effect from: Apr 15, 2015, 3:00 AM MDT
Expired: Apr 14, 2015, 3:29 PM MDT
In force
Issued by: NWS Riverton, WY

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 11:03 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

Riverton, WY (KRIW), launched 00:00Z, 11.1 hours before the alert went out and 182 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3499 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this blizzard watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this blizzard watch went out at Apr 13, 11:14 PM MDT, 5 hours 50 minutes earlier.

Area forecast discussion, Apr 13, 11:14 PM MDT, 5 hours 50 minutes before

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Hazardous weather outlook, Apr 14, 4:44 AM MDT, 20 minutes before

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In the hours before

Special weather statement, Apr 14, 3:31 AM MDT, 1 hour 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 8:53 PM MDT	High Wind Warning	RIW	Fremont, Lincoln, Natrona, Sublette, Sweetwater	25 hr
Apr 13, 9:12 PM MDT	Red Flag Warning	RIW	Big Horn, Fremont, Hot Springs, Johnson, Natrona, Park and 1 more	25 hr
Apr 14, 5:04 AM MDT	Winter Storm Watch	RIW	Big Horn, Fremont, Johnson, Natrona, Sublette, Washakie	10 hr
Apr 14, 3:29 PM MDT	Winter Storm Warning	RIW	Fremont, Hot Springs, Natrona, Sublette, Sweetwater	39 hr
Apr 14, 3:29 PM MDT	Winter Weather Advisory	RIW	Big Horn, Fremont, Hot Springs, Johnson, Lincoln, Natrona and 5 more	39 hr

Nearby

Blizzard Watches in Wyoming, 2015 Every blizzard watch 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.