Alert archive / Nevada / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Reno, NV

July 7, 2011Lyon County, Nevada

NWS Reno, NV issued this flash flood warning at Jul 7, 2011, 3:29 PM PDT for Lyon 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: Jul 7, 2011, 3:29 PM PDT (22:29 UTC)
Expired: Jul 7, 2011, 6:30 PM PDT
In force: 3 hr
Issued by: NWS Reno, NV
Area: Storm-based polygon
Flood severity: None

County Lyon County, NV

The radar

The Reno radar (KRGX), 133 km from the middle of the area, began a volume at 22:32 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, 10.5 hours before the alert went out and 127 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: 165 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 1886 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

619 
WGUS55 KREV 072229
FFWREV
NVC019-080130-
/O.NEW.KREV.FF.W.0003.110707T2229Z-110708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
329 PM PDT THU JUL 7 2011

THE NATIONAL WEATHER SERVICE IN RENO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN LYON COUNTY IN WESTERN NEVADA...

* UNTIL 630 PM PDT

* AT 329 PM PDT...DOPPLER RADAR INDICATED THAT TRAINING THUNDERSTORMS 
  HAVE PRODUCED OVER TWO INCHES OF RAIN HAS FALLEN IN THE PAST THREE
  HOURS OVER THE PINE GROVE HILLS IN SOUTHEASTERN LYON COUNTY.

* HEAVY RAINFALL OVER STEEP TERRAIN IS EXPECTED TO CAUSE FLASH 
  FLOODING TO THE EAST OF THE PINE GROVE HILLS. AREAS THAT MAY BE
  AFFECTED INCLUDE PINE GROVE ROAD NORTH OF FLYING M RANCH. 

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST A FEW INCHES OF FAST FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

LAT...LON 3864 11896 3862 11897 3861 11898 3858 11898
      3856 11902 3853 11909 3862 11913 3868 11895

$$

SNYDER

3 follow-up statements

290 
WGUS75 KREV 072303
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
403 PM PDT THU JUL 7 2011

NVC019-080130-
/O.CON.KREV.FF.W.0003.000000T0000Z-110708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON NV-
403 PM PDT THU JUL 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR
SOUTHEASTERN LYON COUNTY...

AT 402 PM PDT...DOPPLER RADAR INDICATED THAT TRAINING THUNDERSTORMS  
HAVE PRODUCED OVER TWO AND A HALF INCHES OF RAIN IN THE PAST THREE  
HOURS OVER THE PINE GROVE HILLS IN SOUTHEASTERN LYON COUNTY.

HEAVY RAINFALL OVER STEEP TERRAIN IS EXPECTED TO CAUSE FLASH 
FLOODING TO THE EAST OF THE PINE GROVE HILLS. AREAS THAT MAY BE 
AFFECTED INCLUDE PINE GROVE ROAD AND EAST WALKER ROAD NORTH OF
FLYING M RANCH AND SOUTH OF THE CAMBRIDGE MINE. 

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST A FEW INCHES OF FAST FLOWING WATER IS
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

LAT...LON 3864 11896 3862 11897 3861 11898 3858 11898
      3856 11902 3853 11909 3862 11913 3868 11895

$$

SNYDER

996 
WGUS75 KREV 080044
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
544 PM PDT THU JUL 7 2011

NVC019-080130-
/O.CON.KREV.FF.W.0003.000000T0000Z-110708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON NV-
544 PM PDT THU JUL 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR
SOUTHEASTERN LYON COUNTY...

AT 527 PM PDT...SCATTERED SHOWERS CONTINUE TO MOVE ACROSS SOUTHEAST 
LYON COUNTY. ALTHOUGH RAINFALL INTENSITY HAS DECREASED...LOCAL AREAS 
OF FLOODING MAY STILL EXIST IN POOR DRAINAGE AREAS OR ALONG CREEKS 
IN THE PINE GROVE HILLS. AREAS THAT MAY BE AFFECTED INCLUDE PINE 
GROVE ROAD AND EAST WALKER ROAD NORTH OF FLYING M RANCH AND SOUTH OF 
THE CAMBRIDGE MINE. 

IN HILLY TERRAIN RUNOFF ALONG CREEKS AND STREAMS CAN BE POTENTIALLY 
DANGEROUS EVEN AFTER HEAVY RAINFALL HAS DIMINISHED. DO NOT ATTEMPT 
TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES...IT TAKES 
ONLY A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

LAT...LON 3864 11896 3862 11897 3861 11898 3858 11898
      3856 11902 3853 11909 3862 11913 3868 11895

$$
MJD

591 
WGUS75 KREV 080127
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
627 PM PDT THU JUL 7 2011

NVC019-080135-
/O.EXP.KREV.FF.W.0003.000000T0000Z-110708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON NV-
627 PM PDT THU JUL 7 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM PDT FOR SOUTHEASTERN
LYON COUNTY...

SHOWERS AND THUNDERSTORMS HAVE WEAKENED OVER THE WARNED AREA AND 
THE THREAT FOR FLASH FLOODING HAS DIMINISHED. REMEMBER THAT MINOR 
FLOODING OR RUNOFF MAY CONTINUE FOR SEVERAL HOURS AS WATER MAKES ITS 
WAY DOWN FROM HIGHER TERRAIN. REMAIN CAUTIOUS NEAR CREEKS AND 
STREAMS EVEN IF THEY LOOK DRY.

LAT...LON 3864 11896 3862 11897 3861 11898 3858 11898
      3856 11902 3853 11909 3862 11913 3868 11895

$$

HOHMANN

Nearby

Flash Flood Warnings in Nevada, 2011 Every flash flood warning in 2011

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.