Alert archive / Oklahoma / Special Weather Statements in 2017

Special Weather Statement, NWS Norman, OK

September 17, 2017Cleveland County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this special weather statement at Sep 17, 2017, 2:08 PM CDT for Cleveland County, Pottawatomie County, Oklahoma. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 17, 2017, 2:08 PM CDT (19:08 UTC)
Expired: Sep 17, 2017, 3:00 PM CDT
In force: 52 min
Issued by: NWS Norman, OK

Counties Cleveland County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 20 km from the middle of the area, began a volume at 19:07 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, 7.1 hours before the alert went out and 34 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: 1019 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Sep 17, 7:53 AM CDT, 6 hours 15 minutes earlier.

Area forecast discussion, Sep 17, 7:53 AM CDT, 6 hours 15 minutes before

Area Forecast Discussion
National Weather Service Norman OK
753 AM CDT Sun Sep 17 2017

...Update...

&&

.DISCUSSION...
Just sent a minor update to follow radar trends. The forecast
remains in good shape. Convective coverage has increased across
portions of central Oklahoma into northeast Oklahoma over the
last hour or two where subtle moistening in mid levels was seen in
12z OUN sounding. We confined higher probabilities to generally
east of a line from Stillwater to OKC to Holdenville through mid-
morning, aligned with enhanced mid-level moisture in models.
Parcels seem to be originating around 800-700 mb yielding modest
instability (~750 J/kg MUCAPE). Overall weak convection and lack
of boundary layer mixing/momentum transfer potential will limit
strong/severe potential this morning. Also adjusted winds based on
latest obs and short term guidance for a slightly further south
frontal position.

BRB

&&

.PREV DISCUSSION... /issued 717 AM CDT Sun Sep 17 2017/

..Aviation Discussion...

AVIATION...
For the 12z TAFs:

Isolated to scattered convection has increased over the last
couple of hours from central Oklahoma into southwest Oklahoma. A
few lightning strikes have been observed just north of OKC, but
just outside of the 10 nm ring, and direct impact to either OKC
by these storms is not expected. Weaker convection without any
observed lightning yet is occurring near Lawton up to Chickasha.
Vicinity showers were included at other TAF sites this morning.
20-40 percent coverage of convection is expected to continue
through the day with northern TAF sites having the greatest chance
of being impacted, particularly PNC. Otherwise generally light
winds and VFR conditions are expected.

PREV DISCUSSION... /issued 333 AM CDT Sun Sep 17 2017/

DISCUSSION...
Main concerns will be rain chances next couple of days, the hot
temperatures/associated elevated fire weather concerns and finally
development of western trough and its impacts on the southern
Plains by the end of the forecast period.

Weak surface cold front will continue to push slowly south this
morning, before retreating back north late today and tonight.
Widely scattered showers and thunderstorms will remain possible
during the day today. Expect to see an increase in activity
tonight as a wave moves out of the Rockies into the plains,
convection should develop. Highest chances remain across northern
half of Oklahoma. Instability should be sufficient for a few
strong storms.

Still appears that we will see an overall lull in the rain/storm
chances for much of the work week as any large scale forcing is
lacking. However, some isolated activity remains possible nearly
everyday as tropical fetch remains. Best chance would appear to be
late Wednesday into Wednesday night as a cold front pushes south
into the area, however warm mid-level temps may limit our chances
even then.

Our attention then turns to large western trough that takes shape
by the end of the week. The more recent model runs want to
develop a closed low. However, the 00Z run of the GFS does keep
the system open and a bit more progressive compared to the ECMWF,
which keeps the closed low scenario. Have continued to trend
precip chances higher for next weekend, especially across the
west, but confidence is not high enough, because of model
differences, to go more than high chance category.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  88  69  90  71 /  50  30  20  10
Hobart OK         91  67  92  70 /  30  30  10  20
Wichita Falls TX  95  70  94  72 /  20  20  10  10
Gage OK           78  64  91  67 /  40  40  10  20
Ponca City OK     83  68  88  69 /  40  50  40  20
Durant OK         91  70  92  71 /  10  10  10   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

12/03

Hazardous weather outlook, Sep 17, 11:53 AM CDT, 2 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1153 AM CDT Sun Sep 17 2017

OKZ004>048-050>052-TXZ083>090-181700-
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-
1153 AM CDT Sun Sep 17 2017

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

.DAY ONE...Through Tonight...

.Thunderstorms...
Isolated to scattered thunderstorms will occur this afternoon
across portions of central, western and northern Oklahoma and
possible portions of western north Texas. Storm intensity may
increase later this afternoon as instability increases. Although
the threat of severe thunderstorms is low, a few storms could
produce brief strong to possibly severe wind gusts up to 60 mph
and possibly hail up to quarter size late this afternoon.

Later this evening and tonight, thunderstorms over the Texas
Panhandle could consolidate into a cluster of storms and move
into western Oklahoma. Thunderstorm intensity should decrease
overnight as storms continue eastward. Strong wind gusts are
possible, but severe thunderstorms are unlikely.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Thunderstorms...
Remnant thunderstorms will be possible Monday morning across
portions of central and eastern Oklahoma. Additional
thunderstorms may develop Monday afternoon across northern
Oklahoma, where there is Marginal Risk for strong to severe
thunderstorms. Hail and gusty winds are the primary hazards.

A low chance of thunderstorms will return on Thursday with
increasing chances of thunderstorms toward the upcoming weekend.
Locally heavy rainfall will be possible, especially by Saturday.

.Fire Weather...
Elevated fire weather conditions will be possible across portions
of Oklahoma and north Texas from Tuesday through Friday of this
week due to hot temperatures, breezy conditions, and low relative
humidity.

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

In the hours before

Special weather statement, Sep 17, 12:51 PM CDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1251 PM CDT SUN SEP 17 2017

OKZ012-171830-
Garfield OK-
1251 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR central Garfield County Until 130
PM CDT...

AT 1246 PM CDT, a strong thunderstorm was located near Drummond,
moving northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of peas...
Wind gusts to 40 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Enid, Waukomis, Garber, Lahoma, Drummond, Breckenridge, Fairmont,
Vance Air Force Base and North Enid.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3639 9753 3616 9807 3617 9810 3638 9810
      3659 9773
TIME...MOT...LOC 1746Z 235DEG 18KT 3627 9800

03

Special weather statement, Sep 17, 1:43 PM CDT, 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
143 PM CDT SUN SEP 17 2017

OKZ028-029-171930-
Cleveland OK-McClain OK-
143 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Cleveland and west
central McClain Counties Until 230 PM CDT...

AT 138 PM CDT, a strong thunderstorm was located near Goldsby, moving
northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of pennies...
Wind gusts near 40 to 50 mph...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Norman, Moore, Newcastle, Noble, Goldsby, Washington, Cole, Stanley
Draper Lake and southwestern Lake Thunderbird.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3525 9723 3501 9749 3512 9761 3538 9737
TIME...MOT...LOC 1838Z 225DEG 16KT 3512 9749

03

Special weather statement, Sep 17, 1:48 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
148 PM CDT SUN SEP 17 2017

OKZ019-025-026-171930-
Oklahoma OK-Logan OK-Lincoln OK-
148 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR eastern Oklahoma...southeastern
Logan and southwestern Lincoln Counties Until 230 PM CDT...

AT 143 PM CDT, a strong thunderstorm was located 4 miles southwest of
Wellston, moving east at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of pennies...
Wind gusts to 50 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Southeastern Edmond, Midwest City, Chandler, Choctaw, Harrah, Jones,
Nicoma Park, Luther, Wellston, Carney, Tryon, Arcadia, Sparks,
Warwick and Fallis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3544 9731 3563 9739 3594 9697 3564 9673
TIME...MOT...LOC 1843Z 248DEG 16KT 3563 9710

03

Special weather statement, Sep 17, 2:04 PM CDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
204 PM CDT SUN SEP 17 2017

OKZ008-013-171945-
Kay OK-Noble OK-
204 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR Kay and northern Noble Counties
Until 245 PM CDT...

AT 202 PM CDT, a strong thunderstorm was located near Red Rock,
moving northeast at 40 MPH.

HAZARDS INCLUDE...
Hail up to the size of peas...
Wind gusts to 40 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Ponca City, Blackwell, Tonkawa, Newkirk, Kaw City, Red Rock, Marland,
Kildare, Chilocco, Kaw Lake, Hardy, Sooner Lake, Ceres and Peckham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3678 9675 3677 9682 3674 9683 3675 9689
      3668 9693 3669 9705 3666 9706 3660 9704
      3659 9706 3659 9704 3660 9691 3656 9689
      3656 9690 3651 9703 3646 9703 3632 9726
      3647 9740 3700 9724 3700 9675
TIME...MOT...LOC 1902Z 233DEG 34KT 3646 9722

03

Special weather statement, Sep 17, 2:08 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
208 PM CDT SUN SEP 17 2017

OKZ026-029-030-172000-
Pottawatomie OK-Cleveland OK-Lincoln OK-
208 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Pottawatomie...
eastern Cleveland and south central Lincoln Counties Until 300 PM
CDT...

AT 207 PM CDT, strong thunderstorms were along a line extending from
3 miles north of Meeker to near Pink to near Slaughterville, moving
northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Reduced visibility due to heavy rainfall...
Frequent cloud to ground lightning...

Locations impacted include...
Eastern Norman, Shawnee, Tecumseh, Noble, Slaughterville, McLoud,
Lexington, Pink, Meeker, Earlsboro, Tribbey, Johnson, Etowah,
Brooksville, Macomb, Stella, Dale, Lake Thunderbird, Bethel Acres and
Little Axe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3541 9676 3541 9677 3523 9678 3500 9733
      3508 9735 3509 9738 3528 9729 3538 9720
      3538 9714 3543 9714 3553 9705 3563 9674
TIME...MOT...LOC 1907Z 223DEG 17KT 3555 9690 3526 9713 3506 9736

03

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 10:38 PM CDT	Special Weather Statement	OUN	Caddo	37 min
Sep 16, 11:52 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Washita	38 min
Sep 17, 12:51 PM CDT	Special Weather Statement	OUN	Garfield	39 min
Sep 17, 1:43 PM CDT	Special Weather Statement	OUN	Cleveland	47 min
Sep 17, 1:48 PM CDT	Special Weather Statement	OUN	Lincoln	42 min
Sep 17, 2:04 PM CDT	Special Weather Statement	OUN	Kay, Noble	41 min
Sep 17, 2:11 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie	49 min
Sep 17, 2:34 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	41 min
Sep 17, 2:51 PM CDT	Special Weather Statement	OUN	Seminole	39 min
Sep 17, 3:03 PM CDT	Special Weather Statement	OUN	Jefferson	42 min
Sep 17, 3:11 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	34 min
Sep 17, 3:39 PM CDT	Special Weather Statement	OUN	Hughes	36 min
Sep 17, 3:52 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	53 min
Sep 17, 3:54 PM CDT	Special Weather Statement	OUN	Love	36 min
Sep 17, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Love	45 min
Sep 17, 4:17 PM CDT	Areal Flood Advisory	OUN	Hughes	3 hr
Sep 17, 4:42 PM CDT	Special Weather Statement	OUN	Coal, Hughes	48 min
Sep 17, 5:10 PM CDT	Special Weather Statement	OUN	Pontotoc	50 min
Sep 17, 6:12 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	48 min
Sep 16, 7:30 PM CDT	Special Weather Statement	OUN	Hardeman	30 min
Sep 17, 4:34 PM CDT	Special Weather Statement	OUN	Clay	26 min
Sep 17, 4:46 PM CDT	Areal Flood Advisory	OUN	Clay	119 min
Sep 17, 5:13 PM CDT	Special Weather Statement	OUN	Clay	62 min
Sep 17, 5:18 PM CDT	Areal Flood Warning	OUN	Clay	3 hr

Nearby

Special Weather Statements in Oklahoma, 2017 Every special weather statement 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.