Alert archive / Wyoming / Flash Flood Watches in 2014

Flash Flood Watch 2, NWS Riverton, WY

July 11, 20149 counties in Wyoming

NWS Riverton, WY issued this flash flood watch at Jul 11, 2014, 12:33 PM MDT for 9 counties in Wyoming. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 11, 2014, 12:33 PM MDT (18:33 UTC)
Expired: Jul 11, 2014, 8:13 PM MDT
In force: 8 hr
Issued by: NWS Riverton, WY
Flood severity: None

Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Sublette County, WY, Sweetwater County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 17 km from the middle of the area, began a volume at 18:32 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.6 hours before the alert went out and 396 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: 1546 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 11:47 AM MDT	Areal Flood Advisory	RIW	Natrona	3 hr
Jul 11, 11:56 AM MDT	Areal Flood Advisory	RIW	Fremont	3 hr
Jul 11, 1:03 PM MDT	Areal Flood Advisory	RIW	Fremont, Hot Springs	3 hr
Jul 11, 1:11 PM MDT	Areal Flood Advisory	RIW	Johnson, Natrona	3 hr
Jul 11, 1:46 PM MDT	Areal Flood Advisory	RIW	Johnson, Natrona	3 hr
Jul 11, 2:08 PM MDT	Areal Flood Advisory	RIW	Natrona, Washakie	3 hr
Jul 11, 4:25 PM MDT	Special Weather Statement	RIW	Fremont	50 min
Jul 11, 5:54 PM MDT	Special Weather Statement	RIW	Johnson	36 min

Nearby

Flash Flood Watches in Wyoming, 2014 Every flash flood watch in 2014

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.