Alert archive / Nevada / Flash Flood Warnings in 2018
Flash Flood Warning 13, NWS Reno, NV
NWS Reno, NV issued this flash flood warning at Jul 22, 2018, 3:43 PM PDT for Lyon County, Nevada. It was in force for 2 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
- Jul 22, 2018, 3:43 PM PDT (22:43 UTC)
- Expired
- Jul 22, 2018, 6:04 PM PDT
- In force
- 2 hr
- Issued by
- NWS Reno, NV
- Area
- Storm-based polygon
- Flood severity
- None
County Lyon County, NV
The radar
The Reno radar (KRGX), 131 km from the middle of the area, began a volume at 22:46 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
Reno, NV (KREV), launched 12:00Z, 10.7 hours before the alert went out and 139 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
- 74 J/kg
- Mixed-layer CIN
- -161 J/kg
- Mixed-layer LCL
- 1763 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
465
WGUS55 KREV 222243
FFWREV
NVC019-230115-
/O.NEW.KREV.FF.W.0013.180722T2243Z-180723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Reno NV
343 PM PDT SUN JUL 22 2018
The National Weather Service in Reno has issued a
* Flash Flood Warning for...
South central Lyon County in west central Nevada...
* Until 615 PM PDT.
* At 341 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Radar estimates up to 0.70 inc
hes of rain have fallen just east of Sweetwater Summit in the last
hour. Additional amounts of up to 0.50 inches are possible in the
next hour. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Sweetwater Summit.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3867 11924 3866 11917 3855 11908 3845 11918
3857 11929
$$2 follow-up statements
220
WGUS75 KREV 222338
FFSREV
Flash Flood Statement
National Weather Service Reno NV
438 PM PDT SUN JUL 22 2018
NVC019-230115-
/O.CON.KREV.FF.W.0013.000000T0000Z-180723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon NV-
438 PM PDT SUN JUL 22 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM PDT FOR
SOUTH CENTRAL LYON COUNTY...
At 437 PM PDT, light rain continues in the Sweetwater Summit area,
but the heaviest rain has shifted to the south. Run off from recent
heavy rains may still pose a threat of debris flows through the next
couple of hours.
Some locations that will experience flooding include...
Sweetwater Summit.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3867 11924 3866 11917 3855 11908 3845 11918
3857 11929
$$293
WGUS75 KREV 230104
FFSREV
Flash Flood Statement
National Weather Service Reno NV
604 PM PDT SUN JUL 22 2018
NVC019-230114-
/O.CAN.KREV.FF.W.0013.000000T0000Z-180723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon NV-
604 PM PDT SUN JUL 22 2018
...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL LYON COUNTY IS
CANCELLED...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3867 11924 3866 11917 3855 11908 3845 11918
3857 11929
$$The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:32 PM PDT | Flash Flood Warning | REV | Washoe | 2 hr |
| Jul 21, 6:40 PM PDT | Flash Flood Warning | REV | Pershing, Washoe | 2 hr |
| Jul 22, 8:13 AM PDT | Flash Flood Watch | REV | Douglas, Lyon, Storey, Washoe | 13 hr |
| Jul 22, 4:59 PM PDT | Severe Thunderstorm Warning | REV | Storey | 46 min |
Nearby
Flash Flood Warnings in Nevada, 2018Every flash flood warning 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.