Alert archive / Wyoming / Flash Flood Warnings in 2017

Flash Flood Warning 3, NWS Cheyenne, WY

June 6, 2017Albany County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 6, 2017, 3:21 PM MDT for Albany County, Wyoming. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 6, 2017, 3:21 PM MDT (21:21 UTC)
Expired: Jun 6, 2017, 6:15 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 83 km from the middle of the area, began a volume at 21:20 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, 9.4 hours before the alert went out and 270 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: 1378 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

500 
WGUS55 KCYS 062121
FFWCYS
WYC001-070015-
/O.NEW.KCYS.FF.W.0003.170606T2121Z-170607T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cheyenne WY
321 PM MDT TUE JUN 6 2017

The National Weather Service in Cheyenne has issued a

* Flash Flood Warning for...
  South central Albany County in southeastern Wyoming...

* Until 615 PM MDT

* At 321 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 4 to 5 inches of rain have 
  fallen. Flash flooding is expected to begin shortly.

* Flash flooding will remain over mainly rural areas of south central
  Albany County.

Additional rainfall amounts of one inch per hour are possible in the 
warned area.

This includes Interstate 80 in Wyoming between mile markers 298 and
308.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4144 10582 4143 10563 4127 10564 4127 10584

$$

Rubin

1 follow-up statement

888 
WGUS75 KCYS 062313
FFSCYS

Flash Flood Statement
National Weather Service Cheyenne WY
513 PM MDT TUE JUN 6 2017

WYC001-070015-
/O.CON.KCYS.FF.W.0003.000000T0000Z-170607T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Albany WY-
513 PM MDT TUE JUN 6 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
SOUTH CENTRAL ALBANY COUNTY...

At 512 PM MDT, Doppler radar indicated a few showers producing light 
rain across the warned area. 4 to 6 inches of rain have fallen. 

Flash flooding will remain over mainly rural areas of south central
Albany County.

This includes Interstate 80 in Wyoming between mile markers 298 and
308.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

Please report flooding to your local law enforcement agency when you
can do so safely.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4144 10582 4143 10563 4127 10564 4127 10584

$$

Rubin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 6:37 PM MDT	Special Weather Statement	CYS	Niobrara	38 min
Jun 6, 2:28 PM MDT	Special Weather Statement	CYS	Albany	47 min
Jun 6, 2:33 PM MDT	Special Weather Statement	CYS	Albany	42 min
Jun 6, 2:38 PM MDT	Severe Thunderstorm Warning	CYS	Albany	67 min
Jun 6, 3:17 PM MDT	Areal Flood Advisory	CYS	Albany	3 hr
Jun 6, 4:05 PM MDT	Special Weather Statement	CYS	Carbon	40 min
Jun 6, 4:31 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	59 min
Jun 6, 4:55 PM MDT	Areal Flood Advisory	CYS	Carbon	3 hr
Jun 6, 4:59 PM MDT	Areal Flood Advisory	CYS	Carbon	3 hr
Jun 6, 5:09 PM MDT	Special Weather Statement	CYS	Laramie	51 min
Jun 6, 5:17 PM MDT	Areal Flood Advisory	CYS	Albany, Carbon	3 hr
Jun 6, 5:41 PM MDT	Special Weather Statement	CYS		49 min
Jun 6, 5:45 PM MDT	Areal Flood Advisory	CYS	Laramie	5 hr
Jun 6, 5:51 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	54 min

Nearby

Flash Flood Warnings in Wyoming, 2017 Every flash flood warning in 2017

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.