Alert archive / Nevada / Flash Flood Warnings in 2017
Flash Flood Warning 4, NWS Reno, NV
NWS Reno, NV issued this flash flood warning at Feb 21, 2017, 12:39 PM PST for Lyon County, Nevada. It was in force for 6 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
- Feb 21, 2017, 12:39 PM PST (20:39 UTC)
- Expired
- Feb 21, 2017, 6:30 PM PST
- In force
- 6 hr
- Issued by
- NWS Reno, NV
- Area
- Storm-based polygon
- Flood severity
- Major
County Lyon County, NV
The radar
The Reno radar (KRGX), 54 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 117 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
- 679 m above ground
- 0-6 km bulk shear
- 103 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
855
WGUS55 KREV 212039
FFWREV
NVC019-220230-
/O.NEW.KREV.FF.W.0004.170221T2039Z-170222T0230Z/
/00000.3.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Reno NV
1239 PM PST TUE FEB 21 2017
...IMMINENT RETENTION POND FAILURE AFFECTING EAST DAYTON...
The National Weather Service in Reno has issued a
* Flash Flood Warning for...
A Dam Break in...
Central Lyon County in west central Nevada...
* Until 630 PM PST
* At 1233 PM PST, emergency management reported the imminent failure
of the South Dayton Retention Pond in the next 30 minutes to one
hour. Between 2 and 4 feet of water could inundate areas of East
Dayton within 2 to 3 hours of failure.
* Areas affected include East Dayton including, but not limited to,
these streets...Comstock, Sutro, Dayton Valley Road.
Move to higher ground now. This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
LAT...LON 3929 11948 3925 11945 3923 11952 3926 11954
3928 11953
$$
SS2 follow-up statements
203
WGUS75 KREV 212158
FFSREV
Flash Flood Statement
National Weather Service Reno NV
158 PM PST TUE FEB 21 2017
NVC019-220230-
/O.CON.KREV.FF.W.0004.000000T0000Z-170222T0230Z/
/00000.0.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon NV-
158 PM PST TUE FEB 21 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PST FOR
NORTHERN LYON COUNTY...
At 153 PM PST, the Lyon County Emergency Manager indicated that the
South Dayton Retention Pond is full and overflowing into drainages.
No failure has occurred and no homes or properties are currently
threatened. However, the situation could change in the next few
hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Pay attention to the latest information from emergency officials and
the National Weather Service in case the water retention pond fails.
&&
LAT...LON 3928 11951 3926 11951 3925 11952 3926 11954
3928 11953
$$
SS780
WGUS75 KREV 220024
FFSREV
Flash Flood Statement
National Weather Service Reno NV
424 PM PST TUE FEB 21 2017
NVC019-220030-
/O.CAN.KREV.FF.W.0004.000000T0000Z-170222T0230Z/
/00000.0.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon NV-
424 PM PST TUE FEB 21 2017
...THE FLASH FLOOD WARNING FOR NORTHERN LYON COUNTY IS CANCELLED...
We have received word from Lyon County Emergency Management that the
water has receded in the Southwest Dayton Retention Pond and it is
no longer expected to fail. With flood waters receding and no threat
remaining to life or property at this time, the flash flood warning
is cancelled.
LAT...LON 3928 11951 3926 11951 3925 11952 3926 11954
3928 11953
$$
DJThe office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 8:26 PM PST | Areal Flood Warning | REV | Washoe | 15 hr |
Nearby
Flash Flood Warnings in Nevada, 2017Every flash flood warning in 2017
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.