Alert archive / Wyoming / Flash Flood Watches in 2018

Flash Flood Watch 7, NWS Cheyenne, WY

July 22, 2018Albany County, Carbon County, Wyoming

NWS Cheyenne, WY issued this flash flood watch at Jul 22, 2018, 12:22 PM MDT for Albany County, Carbon County, Wyoming. It took effect at Jul 22, 2018, 4:00 PM MDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2018, 12:22 PM MDT (18:22 UTC)
In effect from: Jul 22, 2018, 4:00 PM MDT
Expired: Jul 22, 2018, 10:00 PM MDT
In force: 6 hr
Issued by: NWS Cheyenne, WY
Flood severity: None

Counties Albany County, WY, Carbon County, WY

The radar

The Cheyenne radar (KCYS), 140 km from the middle of the area, began a volume at 18:23 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 12:00Z, 6.4 hours before the alert went out and 329 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: 59 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 2692 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 28 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 Jul 22, 5:18 AM MDT, 7 hours 4 minutes earlier.

Area forecast discussion, Jul 22, 5:18 AM MDT, 7 hours 4 minutes before

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Hazardous weather outlook, Jul 22, 5:01 AM MDT, 7 hours 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:17 PM MDT	Special Weather Statement	CYS	Laramie	43 min
Jul 22, 5:36 PM MDT	Special Weather Statement	CYS		39 min
Jul 21, 6:33 PM MDT	Special Weather Statement	CYS	Banner	42 min

Nearby

Flash Flood Watches in Wyoming, 2018 Every flash flood watch in 2018

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.