Alert archive / Wyoming / Flash Flood Watches in 2015

Flash Flood Watch 3, NWS Cheyenne, WY

June 5, 20157 counties in Wyoming

NWS Cheyenne, WY issued this flash flood watch at Jun 5, 2015, 9:43 AM MDT for 7 counties in Wyoming. It took effect at Jun 5, 2015, 12:00 PM MDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jun 5, 2015, 9:43 AM MDT (15:43 UTC)
In effect from: Jun 5, 2015, 12:00 PM MDT
Expired: Jun 6, 2015, 12:00 AM MDT
In force: 12 hr
Issued by: NWS Cheyenne, WY
Flood severity: None

Counties Albany County, WY, Carbon County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 114 km from the middle of the area, began a volume at 15:46 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 12:00Z, 3.7 hours before the alert went out and 279 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: 109 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 124 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 flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this flash flood watch went out at Jun 5, 5:45 AM MDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jun 5, 5:45 AM MDT, 3 hours 58 minutes before

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Hazardous weather outlook, Jun 5, 5:07 AM MDT, 4 hours 36 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 6:15 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	45 min
Jun 4, 6:28 PM MDT	Severe Thunderstorm Warning	CYS	Converse	26 min
Jun 4, 6:42 PM MDT	Special Weather Statement	CYS	Laramie	48 min
Jun 4, 7:01 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	29 min
Jun 4, 7:14 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	27 min
Jun 4, 7:32 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	21 min
Jun 4, 7:33 PM MDT	Special Weather Statement	CYS	Albany	42 min
Jun 4, 8:41 PM MDT	Special Weather Statement	CYS	Laramie	49 min
Jun 4, 8:46 PM MDT	Special Weather Statement	CYS	Albany	44 min
Jun 4, 9:17 PM MDT	Severe Thunderstorm Warning	CYS	Albany	43 min
Jun 4, 9:35 PM MDT	Special Weather Statement	CYS	Laramie	40 min
Jun 5, 4:23 AM MDT	Areal Flood Advisory	CYS	Niobrara	12 hr
Jun 5, 11:22 AM MDT	Special Weather Statement	CYS	Laramie	53 min
Jun 5, 11:34 AM MDT	Special Weather Statement	CYS	Platte	41 min
Jun 5, 1:26 PM MDT	Special Weather Statement	CYS	Carbon	34 min
Jun 5, 3:11 PM MDT	Special Weather Statement	CYS	Converse	34 min
Jun 5, 3:50 PM MDT	Areal Flood Advisory	CYS	Niobrara	12 hr
Jun 5, 1:04 PM MDT	Special Weather Statement	CYS	Dawes	26 min
Jun 5, 1:07 PM MDT	Special Weather Statement	CYS	Dawes	23 min

Nearby

Flash Flood Watches in Wyoming, 2015 Every flash flood 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.