Alert archive / Wyoming / Flash Flood Watches in 2018
Flash Flood Watch 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood watch at Jun 18, 2018, 1:05 PM MDT for 4 counties in Wyoming; 4 counties in Nebraska. It took effect at Jun 19, 2018, 6:00 AM MDT. It was in force for 19 hr.
The area
The counties it named.
The facts
- Issued
- Jun 18, 2018, 1:05 PM MDT (19:05 UTC)
- In effect from
- Jun 19, 2018, 6:00 AM MDT
- Expired
- Jun 20, 2018, 12:48 AM MDT
- In force
- 19 hr
- Issued by
- NWS Cheyenne, WY
- Flood severity
- None
Counties Box Butte County, NE, Dawes County, NE, Scotts Bluff County, NE, Sioux County, NE, Converse County, WY, Goshen County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 154 km from the middle of the area, began a volume at 19:08 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
Rapid City, SD (KRAP), launched 12:00Z, 7.1 hours before the alert went out and 207 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 513 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 18, 11:53 AM MDT, 1 hour 12 minutes earlier.
Area forecast discussion, Jun 18, 11:53 AM MDT, 1 hour 12 minutes before
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</html>Hazardous weather outlook, Jun 18, 5:33 AM MDT, 7 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 533 AM MDT Mon Jun 18 2018 NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-116>119- 191145- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux-Converse County Lower Elevations- Niobrara County-North Laramie Range- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 533 AM MDT Mon Jun 18 2018 This hazardous weather outlook is for portions of western Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT A few thunderstorms are possible late this afternoon and early evening across the high plains of southeast Wyoming and the western Nebraska Panhandle. Some storms could become strong to severe, with large hail and damaging winds. A tornado or two is also possible. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A few strong to severe thunderstorms are possible again on Tuesday. .Spotter information statement... Spotter activation is possible between 3 PM and 10 PM MDT today. WYZ104-105-109>115-191145- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-North Snowy Range Foothills- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- 533 AM MDT Mon Jun 18 2018 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed.
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:09 PM MDT | Special Weather Statement | CYS | Platte | 51 min |
| Jun 18, 5:14 PM MDT | Special Weather Statement | CYS | Goshen | 46 min |
| Jun 18, 5:20 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 40 min |
| Jun 18, 5:53 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 24 min |
Nearby
Flash Flood Watches in Wyoming, 2018Flash Flood Watches in Nebraska, 2018Every 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.