Alert archive / Nevada / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Reno, NV

July 22, 2012Douglas County, Nevada

NWS Reno, NV issued this flash flood warning at Jul 22, 2012, 5:37 PM PDT for Douglas County, Nevada. It was in force for 113 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 22, 2012, 5:37 PM PDT (00:37 UTC)
Expired: Jul 22, 2012, 7:30 PM PDT
In force: 113 min
Issued by: NWS Reno, NV
Area: Storm-based polygon
Flood severity: None

County Douglas County, NV

The radar

The Reno radar (KRGX), 85 km from the middle of the area, began a volume at 00:41 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, 0.6 hours before the alert went out and 137 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: 25 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 3659 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

670 
WGUS55 KREV 230037
FFWREV
NVC005-230230-
/O.NEW.KREV.FF.W.0002.120723T0037Z-120723T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
537 PM PDT SUN JUL 22 2012

THE NATIONAL WEATHER SERVICE IN RENO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL DOUGLAS COUNTY IN WESTERN NEVADA...

* UNTIL 730 PM PDT

* AT 528 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 13 MILES EAST OF JOHNSON LANE...
  OR 15 MILES EAST OF GARDNERVILLE...MOVING WEST AT 5 MPH.

* HEAVY RAIN WILL AFFECT THE WEST SLOPES OF THE PINE NUT MOUNTAINS.  
  EXCESSIVE RUNOFF MAY REACH THE UPPER PORTIONS OF JOHNSON LANE IN   
  DOUGLAS COUNTY.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS RANCHLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

LAT...LON 3896 11975 3907 11975 3908 11938 3893 11943

$$

BRONG

2 follow-up statements

946 
WGUS75 KREV 230132
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
632 PM PDT SUN JUL 22 2012

NVC005-230230-
/O.CON.KREV.FF.W.0002.000000T0000Z-120723T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS NV-
632 PM PDT SUN JUL 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM PDT FOR NORTH
CENTRAL DOUGLAS COUNTY...

AT 620 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO 
INDICATE SLOW MOVING THUNDERSTORMS PRODUCING HEAVY RAIN OVER 
NORTHERN DOUGLAS COUNTY. 

RADAR ESTIMATES OF NEAR 2 INCHES RAINFALL MAY HAVE FELL IN THE PINE 
NUT MOUNTAINS IN THE VICINITY OF MT COMO AND MINERAL PEAK. 

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...COUNTRY ROADS AND MAY REACH THE UPPER PORTIONS 
OF JOHNSON LANE IN DOUGLAS COUNTY.

LAT...LON 3896 11975 3907 11975 3908 11938 3893 11943

$$

BRONG

371 
WGUS75 KREV 230226
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
726 PM PDT SUN JUL 22 2012

NVC005-230233-
/O.EXP.KREV.FF.W.0002.000000T0000Z-120723T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS NV-
726 PM PDT SUN JUL 22 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 PM PDT FOR NORTH
CENTRAL DOUGLAS COUNTY...

THE THREAT FOR CONTINUED FLASH FLOODING HAS DIMINISHED. HOWEVER 
THUNDERSTORMS DEVELOPING OVER NORTHERN DOUGLAS COUNTY WILL PRODUCE 
MODERATE TO HEAVY RAIN WITH ADDITIONAL AMOUNTS UP TO ONE HALF INCH. 
MINOR FLOODING AND RUNOFF MAY CONTINUE IN THE JOHNSON LANE AREA 
THROUGH 9 PM.

LAT...LON 3896 11975 3907 11975 3908 11938 3893 11943

$$

BRONG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:14 PM PDT	Special Weather Statement	REV	Lyon	61 min
Jul 22, 6:24 PM PDT	Special Weather Statement	REV	Storey	36 min
Jul 22, 6:53 PM PDT	Special Weather Statement	REV	Storey	22 min
Jul 22, 7:09 PM PDT	Special Weather Statement	REV	Storey	66 min
Jul 23, 6:36 AM PDT	Special Weather Statement	REV		24 min
Jul 23, 11:41 AM PDT	Special Weather Statement	REV	Mineral	34 min
Jul 23, 1:58 PM PDT	Special Weather Statement	REV	Mineral	47 min
Jul 23, 2:22 PM PDT	Special Weather Statement	REV		83 min
Jul 23, 3:25 PM PDT	Special Weather Statement	REV		50 min

Nearby

Flash Flood Warnings in Nevada, 2012 Every flash flood warning in 2012

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.