Alert archive / Nevada / Flash Flood Warnings in 2021

Flash Flood Warning 4, NWS Elko, NV

August 1, 2021Elko County, Nevada

NWS Elko, NV issued this flash flood warning at Aug 1, 2021, 1:15 PM PDT for Elko County, Nevada. It was in force for 3 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: Aug 1, 2021, 1:15 PM PDT (20:15 UTC)
Expired: Aug 1, 2021, 4:15 PM PDT
In force: 3 hr
Issued by: NWS Elko, NV
Area: Storm-based polygon
Flood severity: None

County Elko County, NV

The radar

The Boise radar (KCBX), 207 km from the middle of the area, began a volume at 20:20 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

Elko, NV (KLKN), launched 12:00Z, 8.3 hours before the alert went out and 131 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 131 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

822 
WGUS55 KLKN 012015
FFWLKN
NVC007-012315-
/O.NEW.KLKN.FF.W.0004.210801T2015Z-210801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Elko NV
115 PM PDT Sun Aug 1 2021

The National Weather Service in Elko has issued a

* Flash Flood Warning for...
  Northeastern Elko County in northeastern Nevada...

* Until 415 PM PDT.

* At 115 PM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.7 and 1.5 inches of 
  rain have fallen. The expected rainfall rate is 0.5 to 1 inch in 1 
  hour. Additional rainfall amounts of 0.5 to 0.8 inches 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...
  mainly rural areas of Northeastern Elko County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4200 11471 4183 11475 4184 11494 4200 11489
      4200 11483 4200 11477 4200 11476 4200 11475
      4200 11472

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR

$$

86

2 follow-up statements

695 
WGUS75 KLKN 012241
FFSLKN

Flash Flood Statement
National Weather Service Elko NV
341 PM PDT Sun Aug 1 2021

NVC007-012315-
/O.CON.KLKN.FF.W.0004.000000T0000Z-210801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Elko NV-
341 PM PDT Sun Aug 1 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT THIS 
AFTERNOON FOR NORTHEASTERN ELKO COUNTY...

At 341 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 0.7 and 1.5 inches of rain have 
fallen. The expected rainfall rate is 0.5 to 1 inch in 1 hour. 
Additional rainfall amounts of 0.5 to 0.8 inches 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...
  mainly rural areas of Northeastern Elko County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4200 11471 4183 11475 4184 11494 4200 11489
      4200 11483 4200 11477 4200 11476 4200 11475
      4200 11472

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR

$$

86

294 
WGUS75 KLKN 012309
FFSLKN

Flash Flood Statement
National Weather Service Elko NV
409 PM PDT Sun Aug 1 2021

NVC007-012319-
/O.EXP.KLKN.FF.W.0004.000000T0000Z-210801T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Elko NV-
409 PM PDT Sun Aug 1 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT THIS AFTERNOON FOR 
NORTHEASTERN ELKO COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 800 PM PDT for portions 
of north central Nevada and northeast Nevada.

LAT...LON 4200 11471 4183 11475 4184 11494 4200 11489
      4200 11483 4200 11477 4200 11476 4200 11475
      4200 11472

$$

LKN

The office that day

Everything else NWS Elko, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 5:06 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr
Jul 31, 5:21 PM PDT	Special Weather Statement	LKN		54 min
Jul 31, 5:38 PM PDT	Special Weather Statement	LKN		37 min
Jul 31, 5:54 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr
Jul 31, 6:15 PM PDT	Special Weather Statement	LKN		30 min
Jul 31, 6:19 PM PDT	Areal Flood Advisory	LKN	Elko	5 hr
Jul 31, 6:49 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr
Aug 1, 11:39 AM PDT	Areal Flood Advisory	LKN	Elko	110 min
Aug 1, 11:43 AM PDT	Special Weather Statement	LKN		32 min
Aug 1, 11:46 AM PDT	Areal Flood Advisory	LKN	Elko	36 min
Aug 1, 12:16 PM PDT	Flash Flood Warning	LKN	White Pine	2 hr
Aug 1, 12:20 PM PDT	Flash Flood Warning	LKN	Elko	2 hr
Aug 1, 12:34 PM PDT	Areal Flood Advisory	LKN	Elko	42 min
Aug 1, 12:38 PM PDT	Special Weather Statement	LKN	White Pine	37 min
Aug 1, 1:37 PM PDT	Areal Flood Advisory	LKN	White Pine	3 hr
Aug 1, 2:00 PM PDT	Special Weather Statement	LKN		45 min
Aug 1, 2:11 PM PDT	Special Weather Statement	LKN		34 min
Aug 1, 2:43 PM PDT	Special Weather Statement	LKN		47 min
Aug 1, 3:24 PM PDT	Special Weather Statement	LKN	Elko	36 min
Aug 1, 3:29 PM PDT	Special Weather Statement	LKN		31 min
Aug 1, 3:30 PM PDT	Special Weather Statement	LKN		30 min
Aug 1, 3:47 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr
Aug 1, 4:00 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr
Aug 1, 4:24 PM PDT	Areal Flood Advisory	LKN	Elko	3 hr

Nearby

Flash Flood Warnings in Nevada, 2021 Every 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.