Alert archive / Nevada / Areal Flood Warnings in 2011

Areal Flood Warning 2, NWS Reno, NV

September 11, 2011Douglas County, Nevada

NWS Reno, NV issued this areal flood warning at Sep 11, 2011, 3:28 PM PDT for Douglas 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 counties it named.

The facts

Issued: Sep 11, 2011, 3:28 PM PDT (22:28 UTC)
Expired: Sep 11, 2011, 6:11 PM PDT
In force: 3 hr
Issued by: NWS Reno, NV
Area: Storm-based polygon
Flood severity: None

County Douglas County, NV

The radar

The Reno radar (KRGX), 95 km from the middle of the area, began a volume at 22:30 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 142 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: 23 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 2101 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 20 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 areal flood warning 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 areal flood warning went out at Sep 11, 8:25 AM PDT, 7 hours 3 minutes earlier.

Area forecast discussion, Sep 11, 8:25 AM PDT, 7 hours 3 minutes before

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Hazardous weather outlook, Sep 11, 3:03 PM PDT, 25 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RENO NV
303 PM PDT SUN SEP 11 2011

CAZ070>073-NVZ001>005-121415-
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-
303 PM PDT SUN SEP 11 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT
SCATTERED THUNDERSTORMS WILL CONTINUE THIS EVENING. GUSTY OUTFLOW
WINDS UP TO 50 MPH...LOCALLY HEAVY RAINFALL AND DANGEROUS
LIGHTNING WILL BE THE MAIN CONCERN.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS ARE EXPECTED TO CONTINUE ON MONDAY AND TUESDAY AND
THEN DECREASE WEDNESDAY THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED. HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER IN ACCORDANCE WITH
STANDARD OPERATING PROCEDURES.

HTTP://WEATHER.GOV/RENO

In the hours before

Special weather statement, Sep 11, 1:38 PM PDT, 1 hour 50 minutes before

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Special weather statement, Sep 11, 2:58 PM PDT, 30 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
Sep 11, 1:38 PM PDT	Special Weather Statement	REV		22 min
Sep 11, 3:15 PM PDT	Flash Flood Warning	REV	Washoe	2 hr
Sep 11, 4:23 PM PDT	Special Weather Statement	REV		37 min
Sep 11, 4:54 PM PDT	Flash Flood Warning	REV	Washoe	109 min
Sep 11, 4:54 PM PDT	Special Weather Statement	REV		66 min
Sep 11, 2:58 PM PDT	Special Weather Statement	REV	Sierra	32 min
Sep 11, 3:58 PM PDT	Special Weather Statement	REV	Sierra	47 min
Sep 11, 4:58 PM PDT	Special Weather Statement	REV	Sierra	62 min

Nearby

Areal Flood Warnings in Nevada, 2011 Every areal 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.