Alert archive / Wyoming / Flash Flood Watches in 2011

Flash Flood Watch 6, NWS Riverton, WY

July 12, 20116 counties in Wyoming

NWS Riverton, WY issued this flash flood watch at Jul 12, 2011, 12:07 PM MDT for 6 counties in Wyoming. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jul 12, 2011, 12:07 PM MDT (18:07 UTC)
Expired: Jul 12, 2011, 6:06 PM MDT
In force: 6 hr
Issued by: NWS Riverton, WY
Flood severity: None

Counties Fremont County, WY, Hot Springs County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY

The radar

The Riverton/Lander radar (KRIW), 100 km from the middle of the area, began a volume at 18:08 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, 6.1 hours before the alert went out and 106 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: 24 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Riverton, WY wrote its last area forecast discussion before this flash flood watch went out at Jul 12, 2:58 AM MDT, 9 hours 9 minutes earlier.

Area forecast discussion, Jul 12, 2:58 AM MDT, 9 hours 9 minutes before

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Hazardous weather outlook, Jul 12, 10:54 AM MDT, 1 hour 13 minutes before

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In the hours before

Special weather statement, Jul 12, 8:34 AM MDT, 3 hours 33 minutes before

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Special weather statement, Jul 12, 9:13 AM MDT, 2 hours 54 minutes before

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Special weather statement, Jul 12, 10:31 AM MDT, 1 hour 36 minutes before

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Special weather statement, Jul 12, 11:18 AM MDT, 49 minutes before

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Special weather statement, Jul 12, 11:56 AM MDT, 11 minutes before

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Special weather statement, Jul 12, 12:03 PM MDT, 4 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
Jul 11, 6:54 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	51 min
Jul 11, 7:29 PM MDT	Special Weather Statement	RIW		46 min
Jul 11, 7:31 PM MDT	Special Weather Statement	RIW	Teton	44 min
Jul 11, 10:12 PM MDT	Special Weather Statement	RIW	Teton	63 min
Jul 12, 8:34 AM MDT	Special Weather Statement	RIW	Teton	41 min
Jul 12, 10:31 AM MDT	Special Weather Statement	RIW	Teton	44 min
Jul 12, 11:18 AM MDT	Special Weather Statement	RIW	Teton	42 min
Jul 12, 11:56 AM MDT	Special Weather Statement	RIW	Johnson	49 min
Jul 12, 12:03 PM MDT	Special Weather Statement	RIW	Teton	42 min
Jul 12, 12:12 PM MDT	Special Weather Statement	RIW	Hot Springs	48 min
Jul 12, 12:33 PM MDT	Special Weather Statement	RIW	Teton	42 min
Jul 12, 12:39 PM MDT	Special Weather Statement	RIW	Teton	36 min
Jul 12, 12:46 PM MDT	Special Weather Statement	RIW	Sweetwater	44 min
Jul 12, 1:24 PM MDT	Special Weather Statement	RIW	Sweetwater	51 min
Jul 12, 1:30 PM MDT	Areal Flood Advisory	RIW	Park	60 min
Jul 12, 1:40 PM MDT	Areal Flood Advisory	RIW	Johnson, Washakie	60 min
Jul 12, 1:50 PM MDT	Special Weather Statement	RIW	Natrona	40 min
Jul 12, 2:06 PM MDT	Special Weather Statement	RIW	Sublette	39 min
Jul 12, 2:09 PM MDT	Flash Flood Warning	RIW	Johnson, Washakie	3 hr
Jul 12, 2:26 PM MDT	Flash Flood Warning	RIW	Johnson	3 hr
Jul 12, 2:32 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Washakie	58 min
Jul 12, 3:59 PM MDT	Special Weather Statement	RIW		46 min
Jul 12, 4:26 PM MDT	Areal Flood Advisory	RIW	Fremont	3 hr
Jul 12, 4:29 PM MDT	Special Weather Statement	RIW	Big Horn	46 min
Jul 12, 4:32 PM MDT	Special Weather Statement	RIW	Big Horn	43 min
Jul 12, 4:59 PM MDT	Flash Flood Warning	RIW	Johnson, Washakie	7 hr
Jul 12, 5:12 PM MDT	Flash Flood Warning	RIW	Johnson	6 hr
Jul 12, 5:13 PM MDT	Special Weather Statement	RIW	Fremont	47 min
Jul 12, 5:49 PM MDT	Special Weather Statement	RIW	Hot Springs	41 min

Nearby

Flash Flood Watches in Wyoming, 2011 Every flash flood watch in 2011

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.