Alert archive / Nebraska / Flash Flood Watches in 2019
Flash Flood Watch 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood watch at Jul 27, 2019, 2:42 AM MDT for Niobrara County, Wyoming; Dawes County, Sioux County, Nebraska. It took effect at Jul 27, 2019, 12:00 PM MDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 27, 2019, 2:42 AM MDT (08:42 UTC)
- In effect from
- Jul 27, 2019, 12:00 PM MDT
- Expired
- Jul 27, 2019, 8:31 PM MDT
- In force
- 9 hr
- Issued by
- NWS Cheyenne, WY
- Flood severity
- None
Counties Dawes County, NE, Sioux County, NE, Niobrara County, WY
The radar
The Rapid City radar (KUDX), 171 km from the middle of the area, began a volume at 08:46 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 (KUNR), launched 00:00Z, 8.7 hours before the alert went out and 164 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
- 2790 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 177 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 Jul 26, 10:05 PM MDT, 4 hours 37 minutes earlier.
Area forecast discussion, Jul 26, 10:05 PM MDT, 4 hours 37 minutes before
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</html>Hazardous weather outlook, Jul 26, 5:17 AM MDT, 21 hours 25 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 517 AM MDT Fri Jul 26 2019 NEZ002-003-019>021-054-055-095-096-WYZ106>108-116>119-271130- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux- 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- 517 AM MDT Fri Jul 26 2019 This hazardous weather outlook is for portions of western Nebraska and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Widely scattered thunderstorms are expected this afternoon through late this evening. A few of these thunderstorms may become strong and contain hail, strong gusty winds, and frequent lightning. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Thunderstorms will become more numerous Saturday with some strong to marginally severe storms possible. .Spotter information statement... Spotter activation will not be required at this time. WYZ101>105-109>115-271130- Converse County Lower Elevations-Niobrara County- North Laramie Range-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- 517 AM MDT Fri Jul 26 2019 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT A few thunderstorms are possible this afternoon and later tonight as another cold front moves into the area. Overall, the probability for widespread weather is low. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Thunderstorms will increase in coverage for Saturday with some strong to marginally severe storms possible. .Spotter information statement... Spotter activation will not be needed.
In the hours before
Special weather statement, Jul 26, 9:05 PM MDT, 5 hours 37 minutes before
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</html>Local storm report, Jul 26, 10:01 PM MDT, 4 hours 41 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:12 PM MDT | Special Weather Statement | CYS | Laramie | 33 min |
| Jul 26, 6:13 PM MDT | Flash Flood Warning | CYS | Goshen, Laramie, Platte | 3 hr |
| Jul 26, 7:37 PM MDT | Special Weather Statement | CYS | Goshen | 38 min |
| Jul 26, 7:45 PM MDT | Special Weather Statement | CYS | Goshen | 30 min |
| Jul 26, 7:46 PM MDT | Special Weather Statement | CYS | Converse | 29 min |
| Jul 26, 7:58 PM MDT | Flash Flood Warning | CYS | Goshen | 107 min |
| Jul 26, 8:29 PM MDT | Special Weather Statement | CYS | Platte | 31 min |
| Jul 26, 9:05 PM MDT | Special Weather Statement | CYS | Goshen | 25 min |
| Jul 27, 12:09 PM MDT | Special Weather Statement | CYS | Platte | 51 min |
| Jul 27, 12:35 PM MDT | Special Weather Statement | CYS | Niobrara | 40 min |
| Jul 27, 2:58 PM MDT | Special Weather Statement | CYS | Laramie | 47 min |
| Jul 27, 3:17 PM MDT | Special Weather Statement | CYS | Laramie | 43 min |
| Jul 27, 4:34 PM MDT | Special Weather Statement | CYS | Goshen | 41 min |
| Jul 26, 8:15 PM MDT | Special Weather Statement | CYS | Scotts Bluff | 45 min |
| Jul 27, 5:02 PM MDT | Special Weather Statement | CYS | Dawes | 43 min |
| Jul 27, 5:34 PM MDT | Special Weather Statement | CYS | Banner, Box Butte, Scotts Bluff | 41 min |
| Jul 27, 5:39 PM MDT | Special Weather Statement | CYS | Dawes | 51 min |
| Jul 27, 5:52 PM MDT | Special Weather Statement | CYS | Kimball | 53 min |
Nearby
Flash Flood Watches in Nebraska, 2019Flash Flood Watches in Wyoming, 2019Every flash flood watch in 2019
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.