Alert archive / Oregon / Flash Flood Watches in 2015

Flash Flood Watch 5, NWS Medford, OR

December 11, 2015Coos County, Douglas County, Oregon; Siskiyou County, California

NWS Medford, OR issued this flash flood watch at Dec 11, 2015, 9:08 AM PST for Coos County, Douglas County, Oregon; Siskiyou County, California. It took effect at Dec 12, 2015, 4:00 PM PST. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: Dec 11, 2015, 9:08 AM PST (17:08 UTC)
In effect from: Dec 12, 2015, 4:00 PM PST
Expired: Dec 13, 2015, 8:10 PM PST
In force: 28 hr
Issued by: NWS Medford, OR
Flood severity: None

Counties Siskiyou County, CA, Coos County, OR, Douglas County, OR

The radar

The Medford radar (KMAX), 81 km from the middle of the area, began a volume at 17:12 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 5.1 hours before the alert went out and 52 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 197 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 Medford, OR wrote its last area forecast discussion before this flash flood watch went out at Dec 11, 9:02 AM PST, 6 minutes earlier.

Area forecast discussion, Dec 11, 9:02 AM PST, 6 minutes before

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In the hours before

Local storm report, Dec 11, 8:20 AM PST, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
820 AM PST FRI DEC 11 2015

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY SNOW       1 S ADIN                41.19N 120.95W
12/11/2015  M2.8 INCH        MODOC              CA   TRAINED SPOTTER

&&

NWS MEDFORD OR
IRIS SYSTEM

Local storm report, Dec 11, 8:34 AM PST, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
834 AM PST FRI DEC 11 2015

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY RAIN       5 NNE SELMA             42.35N 123.57W
12/11/2015  M1.15 INCH       JOSEPHINE          OR   TRAINED SPOTTER

            OBSERVER LOCATION AT THE BASE OF HAYES HILL.

&&

NWS MEDFORD OR
IRIS SYSTEM

Local storm report, Dec 11, 8:43 AM PST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
843 AM PST FRI DEC 11 2015

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY RAIN       6 SE SELMA              42.23N 123.52W
12/11/2015  M1.69 INCH       JOSEPHINE          OR   TRAINED SPOTTER

            OBSERVER LOCATION N FORK THOMPSON CR RD
            ACROSS FROM BORICA.

&&

NWS MEDFORD OR
IRIS SYSTEM

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 4:34 PM PST	River Flood Warning	MFR	Coos	16 days
Dec 10, 11:11 PM PST	Flood Watch	MFR	Coos, Curry, Douglas, Jackson, Josephine	69 hr
Dec 11, 12:52 AM PST	Gale Warning	MFR		26 hr
Dec 11, 2:49 AM PST	Gale Watch	MFR		13 hr
Dec 11, 3:43 AM PST	Winter Storm Watch	MFR	Douglas, Jackson, Josephine, Klamath	11 hr
Dec 11, 3:43 AM PST	Winter Weather Advisory	MFR	Douglas, Jackson, Josephine, Klamath	18 hr
Dec 11, 4:02 AM PST	High Wind Watch	MFR	Curry, Klamath, Lake	34 hr
Dec 11, 4:02 AM PST	Wind Advisory	MFR	Klamath, Lake	11 hr
Dec 11, 10:32 AM PST	River Flood Warning	MFR	Coos	3 days
Dec 11, 11:21 AM PST	River Flood Watch	MFR	Curry, Josephine	27 hr
Dec 11, 11:21 AM PST	River Flood Watch	MFR	Coos, Douglas	28 hr
Dec 11, 2:50 PM PST	Blizzard Watch	MFR	Douglas, Jackson, Josephine, Klamath	25 hr
Dec 11, 2:50 PM PST	Winter Storm Watch	MFR	Klamath, Lake	25 hr
Dec 11, 2:50 PM PST	Winter Storm Warning	MFR	Coos, Curry, Douglas, Jackson, Josephine, Klamath and 1 more	55 hr
Dec 11, 2:50 PM PST	Winter Weather Advisory	MFR	Klamath, Lake	31 hr
Dec 11, 3:41 PM PST	Gale Watch	MFR		24 hr
Dec 11, 3:41 PM PST	Hazardous Seas Watch	MFR		24 hr

Nearby

Flash Flood Watches in Oregon, 2015 Flash Flood Watches in California, 2015 Every flash flood watch in 2015

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.