Alert archive / Nevada / Flash Flood Warnings in 2021
Flash Flood Warning 8, NWS Reno, NV
NWS Reno, NV issued this flash flood warning at Jul 31, 2021, 8:02 PM PDT for 4 counties in Nevada. It was in force for 118 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2021, 8:02 PM PDT (03:02 UTC)
- Expired
- Jul 31, 2021, 10:00 PM PDT
- In force
- 118 min
- Issued by
- NWS Reno, NV
- Area
- Storm-based polygon
- Flood severity
- None
Counties Churchill County, NV, Lyon County, NV, Storey County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 27 km from the middle of the area, began a volume at 03:04 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
Reno, NV (KREV), launched 00:00Z, 3.0 hours before the alert went out and 84 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
- 143 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 2759 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- -40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
699
WGUS55 KREV 010302
FFWREV
NVC001-019-029-031-010500-
/O.NEW.KREV.FF.W.0008.210801T0302Z-210801T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Reno NV
802 PM PDT Sat Jul 31 2021
The National Weather Service in Reno has issued a
* Flash Flood Warning for...
Western Churchill County in west central Nevada...
North Central Lyon County in west central Nevada...
Storey County in western Nevada...
Southern Washoe County in western Nevada...
* Until 1000 PM PDT.
* At 802 PM PDT, Doppler radar indicated thunderstorms producing
torrential rainfall across along portions of I-80 from Wadsworth
through northern Lyon County near mile marker 65. Up to 1 to 2
inches of rain has fallen. 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. Blinding
downpours and ponding of water is possible along I-80.
Mud and debris flows are possible.
* Some locations that will experience flash flooding include...
Fernley, Fernley Sink Near I-80 and Wadsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3963 11930 3974 11913 3972 11908 3967 11901
3963 11911 3958 11925
FLASH FLOOD...RADAR INDICATED
$$
TF2 follow-up statements
686
WGUS75 KREV 010317
FFSREV
Flash Flood Statement
National Weather Service Reno NV
817 PM PDT Sat Jul 31 2021
NVC001-019-029-031-010500-
/O.CON.KREV.FF.W.0008.000000T0000Z-210801T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Churchill NV-Lyon NV-Storey NV-Washoe NV-
817 PM PDT Sat Jul 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS
EVENING FOR WESTERN CHURCHILL, NORTH CENTRAL LYON, STOREY AND
SOUTHERN WASHOE COUNTIES...
At 817 PM PDT, Doppler radar estimates continues to show torrential
rainfall occurring along Interstate 80 from Wadsworth northeastward
to near mile marker 65.
Between 2 and 3 inches of rain have fallen. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Blinding downpours with mud and debris flows are
possible with these heavy rainfall rate.
Some locations that will experience flash flooding include...
Fernley, Fernley Sink Near I-80 and Wadsworth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3963 11930 3974 11913 3972 11908 3967 11901
3963 11911 3958 11925
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
TF094
WGUS75 KREV 010459
FFSREV
Flash Flood Statement
National Weather Service Reno NV
959 PM PDT Sat Jul 31 2021
NVC001-019-029-031-010509-
/O.EXP.KREV.FF.W.0008.000000T0000Z-210801T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Churchill NV-Lyon NV-Storey NV-Washoe NV-
959 PM PDT Sat Jul 31 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM PDT THIS EVENING FOR
WESTERN CHURCHILL, NORTH CENTRAL LYON, STOREY AND SOUTHERN WASHOE
COUNTIES...
The heavy rain has ended. However, minor flooding may still be
ongoing. Any additional rainfall tonight could cause further issues
for the previously warned area. Please continue to heed remaining
road closures.
LAT...LON 3963 11930 3974 11913 3972 11908 3967 11901
3963 11911 3958 11925
$$The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:29 PM PDT | Special Weather Statement | REV | 46 min | |
| Jul 31, 6:39 PM PDT | Areal Flood Advisory | REV | Mineral | 3 hr |
| Jul 31, 6:56 PM PDT | Flash Flood Warning | REV | Storey, Washoe | 94 min |
| Aug 1, 2:01 PM PDT | Areal Flood Advisory | REV | Washoe | 119 min |
Nearby
Flash Flood Warnings in Nevada, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.