Alert archive / Nebraska / Flash Flood Warnings in 2021
Flash Flood Warning 6, NWS North Platte, NE
NWS North Platte, NE issued this flash flood warning at Aug 19, 2021, 6:13 PM MDT for Keith County, Nebraska. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 19, 2021, 6:13 PM MDT (00:13 UTC)
- Expired
- Aug 19, 2021, 9:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS North Platte, NE
- Area
- Storm-based polygon
- Flood severity
- None
County Keith County, NE
The radar
The North Platte radar (KLNX), 133 km from the middle of the area, began a volume at 00:16 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 6:35 PM MDT | FLASH FLOOD | Ogallala, NE | NUMEROUS STREETS FLOODED IN OGALLALA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.2 hours before the alert went out and 95 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
- 1368 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1220 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 10.2
The text
As transmitted.
444
WGUS53 KLBF 200013
FFWLBF
NEC101-200315-
/O.NEW.KLBF.FF.W.0006.210820T0013Z-210820T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
613 PM MDT Thu Aug 19 2021
The National Weather Service in North Platte has issued a
* Flash Flood Warning for...
Central Keith County in southwestern Nebraska...
* Until 915 PM MDT.
* At 613 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2.5 inches of
rain have fallen. Additional rainfall amounts up to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Ogallala.
This includes the following highways...
Highway 61 between mile markers 85 and 93.
Interstate 80 in Nebraska between mile markers 124 and 128.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4107 10176 4123 10182 4120 10166 4110 10168
FLASH FLOOD...RADAR INDICATED
$$
Roberg2 follow-up statements
913
WGUS73 KLBF 200105
FFSLBF
Flash Flood Statement
National Weather Service North Platte NE
705 PM MDT Thu Aug 19 2021
NEC101-200315-
/O.CON.KLBF.FF.W.0006.000000T0000Z-210820T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Keith NE-
705 PM MDT Thu Aug 19 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT THIS
EVENING FOR CENTRAL KEITH COUNTY...
At 705 PM MDT, local law enforcement reported flooding in Ogallala.
Between 1 and 3 inches of rain have fallen. The expected rainfall
rate is 0.25 to 0.5 inches in 1 hour. Additional rainfall amounts up
to 1 inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Ogallala.
This includes the following highways...
Highway 61 between mile markers 85 and 93...and
near mile marker 95.
Interstate 80 in Nebraska between mile markers 124 and 128.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4107 10176 4123 10182 4120 10166 4110 10168
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...0.25-0.5 INCHES IN 1 HOUR
$$
Roberg742 WGUS73 KLBF 200307 FFSLBF Flash Flood Statement National Weather Service North Platte NE 907 PM MDT Thu Aug 19 2021 NEC101-200317- /O.EXP.KLBF.FF.W.0006.000000T0000Z-210820T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Keith NE- 907 PM MDT Thu Aug 19 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT THIS EVENING FOR CENTRAL KEITH COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4107 10176 4123 10182 4120 10166 4110 10168 $$ Buttler
The office that day
Everything else NWS North Platte, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:02 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Perkins | 43 min |
| Aug 19, 6:32 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Perkins | 43 min |
| Aug 19, 6:42 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Perkins | 48 min |
| Aug 19, 6:50 PM MDT | Areal Flood Advisory | LBF | Arthur | 2 hr |
| Aug 19, 6:59 PM MDT | Areal Flood Advisory | LBF | Chase, Perkins | 2 hr |
| Aug 19, 7:13 PM MDT | Areal Flood Warning | LBF | Chase, Perkins | 24 hr |
| Aug 19, 7:39 PM MDT | Areal Flood Advisory | LBF | Keith, Lincoln, Perkins | 3 hr |
| Aug 19, 7:42 PM MDT | Special Weather Statement | LBF | Perkins | 48 min |
| Aug 19, 8:14 PM MDT | Special Weather Statement | LBF | Chase | 46 min |
| Aug 19, 8:17 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Hayes, Lincoln, Perkins | 43 min |
| Aug 19, 8:28 PM MDT | Special Weather Statement | LBF | Lincoln | 47 min |
| Aug 19, 8:40 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Frontier, Hayes, Lincoln, Perkins | 50 min |
| Aug 19, 8:51 PM MDT | Areal Flood Advisory | LBF | Custer, Keith, Lincoln | 4 hr |
| Aug 19, 8:56 PM MDT | Severe Thunderstorm Warning | LBF | Lincoln | 49 min |
| Aug 19, 9:34 PM MDT | Special Weather Statement | LBF | Frontier, Hayes | 41 min |
| Aug 19, 9:41 PM MDT | Special Weather Statement | LBF | Dawson | 49 min |
| Aug 19, 10:22 PM MDT | Special Weather Statement | LBF | Custer | 38 min |
| Aug 19, 10:28 PM MDT | Special Weather Statement | LBF | Frontier | 47 min |
| Aug 19, 10:32 PM MDT | Special Weather Statement | LBF | Chase | 43 min |
| Aug 19, 11:15 PM MDT | Special Weather Statement | LBF | Chase | 45 min |
| Aug 19, 11:58 PM MDT | Special Weather Statement | LBF | Hayes | 47 min |
| Aug 20, 12:39 AM MDT | Areal Flood Warning | LBF | Chase, Hayes | 19 hr |
| Aug 20, 12:50 AM MDT | Areal Flood Advisory | LBF | Lincoln | 2 hr |
| Aug 20, 12:56 AM MDT | Special Weather Statement | LBF | Lincoln | 49 min |
| Aug 20, 2:12 AM MDT | Special Weather Statement | LBF | Custer | 48 min |
| Aug 20, 9:35 AM MDT | River Flood Advisory | LBF | Hayes | 10 hr |
| Aug 20, 1:40 PM MDT | River Flood Advisory | LBF | Lincoln | 24 hr |
Nearby
Flash Flood Warnings in Nebraska, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.