Alert archive / Oklahoma / Flood Watches in 2017

Flood Watch 7, NWS Norman, OK

August 16, 201712 counties in Oklahoma

NWS Norman, OK issued this flood watch at Aug 16, 2017, 2:12 PM CDT for 12 counties in Oklahoma. It took effect at Aug 16, 2017, 7:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Aug 16, 2017, 2:12 PM CDT (19:12 UTC)
In effect from
Aug 16, 2017, 7:00 PM CDT
Expired
Aug 17, 2017, 3:49 AM CDT
In force
9 hr
Issued by
NWS Norman, OK
Flood severity
None

Counties Cleveland County, OK, Hughes County, OK, Kay County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 35 km from the middle of the area, began a volume at 19:14 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

Norman, OK (KOUN), launched 12:00Z, 7.2 hours before the alert went out and 51 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, Norman, OK at 12:00Z on 2017-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1017 joules per kilogram.LCLLFCEL10008507005003002001001 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, Norman, OK at 12:00Z on 2017-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.193958Sfc1 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
1017 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
1102 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.8

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 Norman, OK wrote its last area forecast discussion before this flood watch went out at Aug 16, 11:22 AM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Aug 16, 11:22 AM CDT, 2 hours 50 minutes before
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Hazardous weather outlook, Aug 16, 11:45 AM CDT, 2 hours 27 minutes before
Hazardous Weather Outlook
National Weather Service Norman OK
1145 AM CDT Wed Aug 16 2017

OKZ004>048-050>052-TXZ083>090-171645-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
1145 AM CDT Wed Aug 16 2017

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
There is Slight Risk of severe thunderstorms across portions of
northern and central Oklahoma and a Marginal Risk for much of the
rest of the area.

Location...
The Slight Risk area is northeast of a line from near Alva to
Hobart to Lawton to Seminole. A Marginal Risk surrounds the Slight
Risk and encompasses all but far northwest Oklahoma.

Timing...
The most likely time for severe weather will be from 3 PM to 10 PM.

Impacts...
Damaging winds up to 70 mph. Mainly quarter to half dollar size
hail but possibly as large as golf balls. Very heavy rain.

Discussion...
Thunderstorms will increase by mid afternoon across portions of
south-central and southeast Oklahoma. A few of these storms could
become severe with damaging wind gusts the primary threat.

A more substantial severe weather threat could develop later this
afternoon along a cold front moving through the area.
Thunderstorms with large hail and damaging winds could impact
north central Oklahoma first and then develop southwestward into
southwest Oklahoma. By evening, a line of thunderstorms could
form and move across much of central Oklahoma.

The potential for severe storms is expected to diminish late this
evening and overnight but thunderstorms will remain possible
across portions of the area through early Thursday. Heavy rain and
cloud to ground lightning would be the main impacts with these
storms.

.Heavy Rainfall/Flooding...
A very moist environment will support locally heavy rainfall
amounts and the potential for flooding or flash flooding. Portions
of the area have experienced heavy rainfall amounts already
causing the ground to be saturated. Additional heavy rainfall on
these saturated grounds could lead to flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Thunderstorms will be possible each day through Tuesday. Strong
to severe storms will be possible across western Oklahoma and
portions of western north Texas Thursday evening. Large hail and
damaging wind gusts will be the main concerns along with
torrential rainfall.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, Aug 16, 10:32 AM CDT, 3 hours 40 minutes before
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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 8:12 PM CDTSpecial Weather StatementOUNMurray33 min
Aug 15, 8:39 PM CDTSpecial Weather StatementOUNSeminole36 min
Aug 15, 9:15 PM CDTSpecial Weather StatementOUNHughes30 min
Aug 15, 9:28 PM CDTAreal Flood AdvisoryOUNPontotoc, Seminole3 hr
Aug 15, 9:41 PM CDTFlash Flood WarningOUNPontotoc, Seminole3 hr
Aug 16, 4:47 PM CDTSpecial Weather StatementOUNAlfalfa28 min
Aug 16, 5:23 PM CDTSpecial Weather StatementOUNMajor37 min
Aug 16, 5:32 PM CDTSevere Thunderstorm WarningOUNMajor43 min
Aug 16, 5:47 PM CDTSpecial Weather StatementOUNKay28 min
Aug 16, 5:48 PM CDTSpecial Weather StatementOUNGrant27 min
Aug 16, 5:54 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Major36 min
Aug 16, 5:59 PM CDTSpecial Weather StatementOUNGrant31 min
Aug 16, 6:14 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Major46 min
Aug 16, 6:19 PM CDTSpecial Weather StatementOUNDewey26 min
Aug 16, 6:29 PM CDTSpecial Weather StatementOUNKay31 min
Aug 16, 6:36 PM CDTSevere Thunderstorm WarningOUNDewey39 min
Aug 16, 6:54 PM CDTSevere Thunderstorm WarningOUNKay51 min
Aug 16, 6:59 PM CDTSpecial Weather StatementOUNMajor31 min

Nearby

Flood Watches in Oklahoma, 2017Every flood watch in 2017

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.