Alert archive / California / Flash Flood Warnings in 2011

Flash Flood Warning 1, NWS Reno, NV

July 6, 2011Alpine County, California

NWS Reno, NV issued this flash flood warning at Jul 6, 2011, 1:26 PM PDT for Alpine County, California. 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 6, 2011, 1:26 PM PDT (20:26 UTC)
Expired: Jul 6, 2011, 4:15 PM PDT
In force: 3 hr
Issued by: NWS Reno, NV
Area: Storm-based polygon
Flood severity: None

County Alpine County, CA

The radar

The Reno radar (KRGX), 115 km from the middle of the area, began a volume at 20:29 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, 8.4 hours before the alert went out and 171 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: 2 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 2523 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 56 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.

025 
WGUS55 KREV 062026
FFWREV
CAC003-062315-
/O.NEW.KREV.FF.W.0001.110706T2026Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RENO NV
126 PM PDT WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN RENO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL ALPINE COUNTY IN CENTRAL CALIFORNIA...

* UNTIL 415 PM PDT

* AT 120 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE CA HWY 88 FROM THE JUNCTION OF 89 
  TO WOODFOORDS.

RADAR ESTIMATES OF UP TO ONE INCH OF RAINFALL HAS OCCURRED IN THE 
LAST HOUR. THE THUNDERSTORM IS EXPECTED TO PERSIST OVER THE SAME 
AREA WITH UP TO ANOTHER HALF INCH OF RAIN POSSIBLE IN THE NEXT 30 
MINUTES.

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 3878 11996 3880 11994 3881 11993 3883 11980
      3873 11976 3870 11995

$$

MYRICK

2 follow-up statements

401 
WGUS75 KREV 062114
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
214 PM PDT WED JUL 6 2011

CAC003-062315-
/O.CON.KREV.FF.W.0001.000000T0000Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALPINE CA-
214 PM PDT WED JUL 6 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR NORTH
CENTRAL ALPINE COUNTY...

AT 208 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE AN AREA OF MODERATE TO HEAVY RAIN PRODUCING FLASH FLOODING 
OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CA HWY 88 
FROM THE JUNCTION OF ROUTE 89 TO WOODFORDS.

RADAR ESTIMATES OF 1 TO 1.5 INCHES OF RAINFALL HAVE OCCURRED IN THE 
HUMBOLDT TOIYABE NATIONAL FOREST WEST OF MARKLEEVILLE.

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 3878 11995 3880 11994 3881 11993 3883 11980
      3873 11976 3870 11995

$$

MYRICK

827 
WGUS75 KREV 062317
FFSREV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RENO NV
417 PM PDT WED JUL 6 2011

CAC003-062326-
/O.EXP.KREV.FF.W.0001.000000T0000Z-110706T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALPINE CA-
417 PM PDT WED JUL 6 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR NORTH CENTRAL ALPINE
COUNTY...

THE THREAT FOR FLASH FLOODING HAS DIMINISHED. A SMALL STREAM FLOOD
ADVISORY IS NOW IN EFFECT UNTIL 615 PM FOR MUCH OF WESTERN AND NORTH
CENTRAL ALPINE COUNTY. REMEMBER THAT MINOR FLOODING OR RUNOFF MAY
CONTINUE IN LOW SPOTS FOR SEVERAL HOURS.

LAT...LON 3878 11995 3880 11994 3881 11993 3883 11980
      3873 11976 3870 11995

$$

MYRICK/HOHMANN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:22 PM PDT	Special Weather Statement	REV	Plumas	38 min
Jul 6, 2:05 PM PDT	Lake Wind Advisory	REV	Alpine, El Dorado, Nevada, Placer	30 hr
Jul 6, 2:30 PM PDT	Special Weather Statement	REV	Sierra	30 min
Jul 6, 3:04 PM PDT	Areal Flood Advisory	REV	Nevada, Sierra	56 min
Jul 6, 4:04 PM PDT	Special Weather Statement	REV	Lassen	26 min
Jul 6, 4:15 PM PDT	Areal Flood Advisory	REV	Alpine	89 min

Nearby

Flash Flood Warnings in California, 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.