Alert archive / Washington / Flood Watches in 2016

Flood Watch 12, NWS Seattle, WA

October 11, 2016Mason County, Snohomish County, Whatcom County, Washington

NWS Seattle, WA issued this flood watch at Oct 11, 2016, 3:21 AM PDT for Mason County, Snohomish County, Whatcom County, Washington. It took effect at Oct 13, 2016, 12:00 PM PDT. It was in force for 22 hr.

The area

The counties it named.

The facts

Issued
Oct 11, 2016, 3:21 AM PDT (10:21 UTC)
In effect from
Oct 13, 2016, 12:00 PM PDT
Expired
Oct 14, 2016, 10:28 AM PDT
In force
22 hr
Issued by
NWS Seattle, WA
Flood severity
None

Counties Mason County, WA, Snohomish County, WA, Whatcom County, WA

The radar

The Seattle radar (KATX), 22 km from the middle of the area, began a volume at 10:23 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

Spokane, WA (KOTX), launched 00:00Z, 10.4 hours before the alert went out and 439 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-pSkew-T log-p diagram, Spokane, WA at 00:00Z on 2016-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 00:00Z on 2016-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1835 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
32 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 flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Seattle, WA wrote its last area forecast discussion before this flood watch went out at Oct 10, 9:22 PM PDT, 5 hours 59 minutes earlier.

Area forecast discussion, Oct 10, 9:22 PM PDT, 5 hours 59 minutes before
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The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 11, 3:10 AM PDTSmall Craft AdvisorySEW14 hr
Oct 11, 2:11 PM PDTGale WatchSEW43 hr

Nearby

Flood Watches in Washington, 2016Every flood watch in 2016

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.