Alert archive / California / Flash Flood Watches in 2013

Flash Flood Watch 5, NWS Reno, NV

August 21, 20136 counties in Nevada; 8 counties in California

NWS Reno, NV issued this flash flood watch at Aug 21, 2013, 2:28 AM PDT for 6 counties in Nevada; 8 counties in California. It took effect at Aug 21, 2013, 2:00 PM PDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Aug 21, 2013, 2:28 AM PDT (09:28 UTC)
In effect from: Aug 21, 2013, 2:00 PM PDT
Expired: Aug 21, 2013, 6:22 PM PDT
In force: 4 hr
Issued by: NWS Reno, NV
Flood severity: None

Counties Alpine County, CA, El Dorado County, CA, Lassen County, CA, Modoc County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Churchill County, NV, Douglas County, NV, Lyon County, NV, Pershing County, NV, Storey County, NV, Washoe County, NV

The radar

The Reno radar (KRGX), 42 km from the middle of the area, began a volume at 09:32 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 00:00Z, 9.5 hours before the alert went out and 150 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: 204 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 3144 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Reno, NV wrote its last area forecast discussion before this flash flood watch went out at Aug 20, 10:34 PM PDT, 3 hours 54 minutes earlier.

Area forecast discussion, Aug 20, 10:34 PM PDT, 3 hours 54 minutes before

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Hazardous weather outlook, Aug 20, 2:55 PM PDT, 11 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RENO NV
255 PM PDT TUE AUG 20 2013

CAZ070>073-NVZ001>005-211300-
SURPRISE VALLEY CALIFORNIA-LASSEN-EASTERN PLUMAS-
EASTERN SIERRA COUNTIES-GREATER LAKE TAHOE AREA-MONO-
MINERAL AND SOUTHERN LYON COUNTIES-GREATER RENO-CARSON CITY-
MINDEN AREA-WESTERN NEVADA BASIN AND RANGE INCLUDING PYRAMID LAKE-
NORTHERN WASHOE COUNTY-
255 PM PDT TUE AUG 20 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE EASTERN SIERRA...
NORTHEAST CALIFORNIA AND WESTERN NEVADA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS IN THE SIERRA...
WESTERN NEVADA...AND NORTHEAST CALIFORNIA. STRONGER STORMS MAY
PRODUCE HEAVY RAIN...SMALL HAIL AND WIND GUSTS TO 50 MPH. A FEW
STORMS MAY LAST INTO THE LATE EVENING ESPECIALLY IN THE NORTHERN
SIERRA.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS WILL CONTINUE ON WEDNESDAY. ABUNDANT MOISTURE AND
SIGNIFICANT INSTABILITY WILL INCREASE THE CHANCES FOR SEVERE
STORMS WITH LARGE HAIL AND FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER TO THE
NATIONAL WEATHER SERVICE ACCORDING TO STANDARD OPERATING PROCEDURE.

REPORTS OF SEVERE WEATHER ARE ALSO WELCOME BY POSTING TO THE
NATIONAL WEATHER SERVICE RENO FACEBOOK PAGE...OR ON TWITTER
USING...AT NWSRENO.

FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE VISIT...
HTTP://FORECAST.WEATHER.GOV/HAZARDS/REV  (ALL LOWER CASE)

In the hours before

Special weather statement, Aug 20, 9:36 PM PDT, 4 hours 52 minutes before

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Local storm report, Aug 20, 10:12 PM PDT, 4 hours 16 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 5:03 PM PDT	Special Weather Statement	REV		27 min
Aug 20, 5:29 PM PDT	Special Weather Statement	REV	Storey	46 min
Aug 20, 5:39 PM PDT	Special Weather Statement	REV	Storey	36 min
Aug 20, 6:07 PM PDT	Special Weather Statement	REV	Storey	38 min
Aug 20, 6:23 PM PDT	Areal Flood Advisory	REV	Lyon, Storey	112 min
Aug 20, 6:34 PM PDT	Special Weather Statement	REV		56 min
Aug 20, 6:51 PM PDT	Areal Flood Advisory	REV	Storey, Washoe	114 min
Aug 20, 7:28 PM PDT	Flash Flood Warning	REV	Storey, Washoe	3 hr
Aug 20, 7:50 PM PDT	Special Weather Statement	REV	Pershing	55 min
Aug 20, 8:26 PM PDT	Special Weather Statement	REV	Pershing	64 min
Aug 20, 9:36 PM PDT	Special Weather Statement	REV	Churchill, Pershing	54 min
Aug 21, 12:25 PM PDT	Special Weather Statement	REV		65 min
Aug 21, 1:13 PM PDT	Special Weather Statement	REV		32 min
Aug 21, 1:37 PM PDT	Severe Thunderstorm Warning	REV	Mineral	38 min
Aug 21, 2:46 PM PDT	Severe Thunderstorm Warning	REV	Mineral	44 min
Aug 21, 4:04 PM PDT	Special Weather Statement	REV	Washoe	56 min
Aug 21, 12:45 PM PDT	Special Weather Statement	REV	Sierra	30 min
Aug 21, 1:16 PM PDT	Severe Thunderstorm Warning	REV	Plumas	44 min
Aug 21, 1:55 PM PDT	Severe Thunderstorm Warning	REV	Alpine, El Dorado	35 min
Aug 21, 2:14 PM PDT	Special Weather Statement	REV	Plumas	61 min
Aug 21, 2:26 PM PDT	Special Weather Statement	REV	Plumas	34 min
Aug 21, 2:34 PM PDT	Special Weather Statement	REV	Plumas	41 min
Aug 21, 3:29 PM PDT	Special Weather Statement	REV	Mono	31 min

Nearby

Flash Flood Watches in California, 2013 Flash Flood Watches in Nevada, 2013 Every flash flood watch in 2013

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.