Alert archive / Oklahoma / Flash Flood Warnings in 2017

Flash Flood Warning 63, NWS Norman, OK

July 2, 2017Seminole County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jul 2, 2017, 4:18 PM CDT for Seminole County, Oklahoma. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 2, 2017, 4:18 PM CDT (21:18 UTC)
Expired: Jul 2, 2017, 7:15 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Seminole County, OK

The radar

The Norman radar (KTLX), 60 km from the middle of the area, began a volume at 21:19 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.

What was reported inside it

Time	Report	Where	Remark
Jul 2, 4:35 PM CDT	FLASH FLOOD	1 E Maud, OK	WATER COMING OVER COUNTY ROAD BEGINNING TO WASH OUT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 17 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.3 hours before the alert went out and 66 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: 308 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 1294 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

847 
WGUS54 KOUN 022118
FFWOUN
OKC133-030015-
/O.NEW.KOUN.FF.W.0063.170702T2118Z-170703T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
418 PM CDT SUN JUL 2 2017

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Southwestern Seminole County in east central Oklahoma...

* Until 715 PM CDT
  
* At 418 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is occurring or is imminent.

Additional rainfall amounts of one to two inches are possible in the 
warned area over the next hour.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3496 9671 3498 9678 3514 9678 3526 9667
      3512 9652

$$

03

1 follow-up statement

414 
WGUS74 KOUN 022142
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
442 PM CDT SUN JUL 2 2017

OKC133-030015-
/O.CON.KOUN.FF.W.0063.000000T0000Z-170703T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Seminole OK-
442 PM CDT SUN JUL 2 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
SOUTHWESTERN SEMINOLE COUNTY...

At 440 PM CDT, local law enforcement reported flash flooding just 
east of Maud due to a thunderstorm over Seminole County. Nearly four 
inches of rain have already fallen. Flash flooding is expected to 
continue from near Bowlegs to Maud, especially near and along state 
highway 59 just southeast of Maud.

Additional rainfall amounts of one inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3496 9671 3498 9678 3514 9678 3526 9667
      3512 9652

$$

03

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Jul 2, 2:16 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jul 2, 2:16 PM CDT, 2 hours 2 minutes before

Area Forecast Discussion
National Weather Service Norman OK
216 PM CDT Sun Jul 2 2017

.DISCUSSION...
Rain chances and location of said rain continues to be main
challenge moving forward the next several days.

MCV moving across southwest toward central Oklahoma expected to
be mechanism for development of scattered convection across
portions of central into southeast Oklahoma this afternoon and
evening. Sufficient instability exists for a few marginally severe
storms, but should be more multicell and pulse as wind shear
remains very weak.

As we move through the next several days it will be tough
to really nail down timing and locations, much like today will
likely be driven by small scale features that will not show
themselves on scales that models are able to get a handle on.
Therefore will have to cont to follow the signals the models do
pick up on. The first of which is a minor shortwave that drop
southeast out of the high plains of CO overnight. This will aid in
development of complex of storms that may move back into western
Oklahoma overnight and approach central Oklahoma toward morning.
This feature then continue to drift south/southeast keeping better
rain chances in areas near and northeast of the OKC metro
Tuesday.

Next feature will be shortwave that drops south through Plains
Tuesday night into Wednesday, which may provide one more day with
chance of rain come Wednesday.

After this we begin to come under the influence of upper ridge
that build north and northeast into central Rockies into the
central Plains. This will likely shut off the better rain chances
and leave us with hot and muggy weather by the end of the week
into next weekend.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  71  90  73  90 /  30  30  40  30
Hobart OK         71  93  73  95 /  30  30  30  20
Wichita Falls TX  74  95  75  96 /  20  30  20  20
Gage OK           69  93  68  93 /  30  20  40  20
Ponca City OK     70  88  71  87 /  40  30  60  40
Durant OK         74  91  74  91 /  60  30  20  20

&&

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

26/30

Hazardous weather outlook, Jul 2, 12:02 PM CDT, 4 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1202 PM CDT Sun Jul 2 2017

OKZ004>048-050>052-TXZ083>090-031715-
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-
1202 PM CDT Sun Jul 2 2017

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

.DAY ONE...Today and Tonight...

.Thunderstorms...
Thunderstorms are expected to develop again this afternoon, mainly
east of a line from Alva to Clinton to Hobart Oklahoma to Seymour
Texas. Some of these storms could become strong or marginally
severe. Additional thunderstorms are possible across northern
Oklahoma after midnight as storms move southeast from the Colorado
high plains. Locally heavy rainfall will accompany will be
possible both this afternoon and overnight.

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

.Thunderstorms...
Scattered thunderstorms are possible Monday though Thursday at
times. Strong to marginally severe storms will be possible again
on Monday and Tuesday, mainly across northern and central
Oklahoma.

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, Jul 2, 3:27 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
327 PM CDT SUN JUL 2 2017

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

0225 PM     TSTM WND DMG     2 NNW SPENCER           35.54N 97.39W
07/02/2017                   OKLAHOMA           OK   PUBLIC

            LOTS OF UTILITY POLES SNAPPED ON 63RD ST.
            NEAR MIDWEST BLVD.

&&

JP

Local storm report, Jul 2, 3:30 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
330 PM CDT SUN JUL 2 2017

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

0324 PM     TSTM WND GST     2 NNE COYLE             35.98N 97.22W
07/02/2017  E60 MPH          PAYNE              OK   TRAINED SPOTTER

&&

JP

Local storm report, Jul 2, 3:41 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
341 PM CDT SUN JUL 2 2017

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

0330 PM     TSTM WND DMG     STILLWATER              36.12N 97.06W
07/02/2017                   PAYNE              OK   EMERGENCY MNGR

            12-INCH DIAMETER TREE DOWNED.

&&

JP

Special weather statement, Jul 2, 3:51 PM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
351 PM CDT SUN JUL 2 2017

OKZ026-030-022115-
Pottawatomie OK-Lincoln OK-
351 PM CDT SUN JUL 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR north central Pottawatomie and
south central Lincoln Counties Until 415 PM CDT...

AT 350 PM CDT, a strong thunderstorm was located near Meeker, moving
northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3540 9696 3550 9704 3563 9685 3543 9684
TIME...MOT...LOC 2050Z 224DEG 19KT 3547 9693

..speg.

Local storm report, Jul 2, 3:59 PM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
359 PM CDT SUN JUL 2 2017

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

0356 PM     TSTM WND GST     6 S STROUD              35.66N 96.66W
07/02/2017  E60 MPH          LINCOLN            OK   STORM CHASER

&&

JP

Special weather statement, Jul 2, 4:14 PM CDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
414 PM CDT SUN JUL 2 2017

OKZ041>043-046-047-022145-
Coal OK-Carter OK-Pontotoc OK-Johnston OK-Murray OK-
414 PM CDT SUN JUL 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR west central Coal...east central
Carter...Pontotoc...northwestern Johnston and eastern Murray Counties
Until 445 PM CDT...

AT 413 PM CDT, strong thunderstorms were along a line extending from
near Fitzhugh to 6 miles east of Gene Autry, moving northeast at 35
MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...

LAT...LON 3437 9656 3420 9706 3467 9691 3490 9656
      3487 9653 3487 9652 3491 9649 3492 9647
      3490 9643 3493 9641 3487 9640
TIME...MOT...LOC 2113Z 234DEG 32KT 3468 9680 3428 9692

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 4:13 AM CDT	Special Weather Statement	OUN	Harmon	47 min
Jul 2, 4:57 AM CDT	Special Weather Statement	OUN	Harmon	48 min
Jul 2, 5:25 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Jackson	20 min
Jul 2, 5:45 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Jackson	30 min
Jul 2, 2:12 PM CDT	Special Weather Statement	OUN	Alfalfa	33 min
Jul 2, 2:16 PM CDT	Special Weather Statement	OUN	Lincoln	29 min
Jul 2, 2:22 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	38 min
Jul 2, 2:25 PM CDT	Special Weather Statement	OUN	Oklahoma	35 min
Jul 2, 2:47 PM CDT	Special Weather Statement	OUN	Grant	28 min
Jul 2, 2:48 PM CDT	Special Weather Statement	OUN	Carter	27 min
Jul 2, 2:48 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	42 min
Jul 2, 2:59 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	46 min
Jul 2, 3:00 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	30 min
Jul 2, 3:10 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	50 min
Jul 2, 3:12 PM CDT	Special Weather Statement	OUN	Grant	33 min
Jul 2, 3:17 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	43 min
Jul 2, 3:19 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Noble, Payne	41 min
Jul 2, 3:29 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pontotoc, Pottawatomie, Seminole	46 min
Jul 2, 3:34 PM CDT	Areal Flood Advisory	OUN	Lincoln	3 hr
Jul 2, 3:51 PM CDT	Special Weather Statement	OUN	Lincoln	24 min
Jul 2, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Grant	29 min
Jul 2, 4:02 PM CDT	Areal Flood Advisory	OUN	Pottawatomie, Seminole	3 hr
Jul 2, 4:14 PM CDT	Special Weather Statement	OUN	Pontotoc	31 min
Jul 2, 4:19 PM CDT	Special Weather Statement	OUN	Seminole	26 min
Jul 2, 4:22 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray, Pontotoc	53 min
Jul 2, 4:24 PM CDT	Special Weather Statement	OUN	Jefferson	36 min
Jul 2, 4:25 PM CDT	Special Weather Statement	OUN	Kay	50 min
Jul 2, 4:51 PM CDT	Special Weather Statement	OUN	Coal, Hughes	24 min
Jul 2, 4:54 PM CDT	Special Weather Statement	OUN	Carter, Love	36 min
Jul 2, 4:56 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	49 min
Jul 2, 5:02 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	32 min
Jul 2, 5:10 PM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Jul 2, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Murray	47 min
Jul 2, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc	48 min
Jul 2, 6:10 PM CDT	Special Weather Statement	OUN	McClain	50 min
Jul 2, 6:12 PM CDT	Special Weather Statement	OUN	Garfield	33 min
Jul 2, 6:17 PM CDT	Flash Flood Warning	OUN	Coal, Murray, Pontotoc	6 hr
Jul 2, 6:19 PM CDT	Special Weather Statement	OUN	Carter	41 min
Jul 2, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	38 min
Jul 2, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	49 min
Jul 2, 6:35 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Stephens	40 min
Jul 2, 6:35 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Stephens	40 min
Jul 2, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	48 min
Jul 2, 6:45 PM CDT	Special Weather Statement	OUN	Love	45 min
Jul 2, 6:53 PM CDT	Flash Flood Warning	OUN	Coal	6 hr

Nearby

Flash Flood Warnings in Oklahoma, 2017 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.