Alert archive / Oklahoma / Flash Flood Warnings in 2017

Flash Flood Warning 98, NWS Norman, OK

August 25, 20175 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at Aug 25, 2017, 9:45 AM CDT for 5 counties in Oklahoma. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 25, 2017, 9:45 AM CDT (14:45 UTC)
Expired: Aug 25, 2017, 1:15 PM CDT
In force: 4 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Beckham County, OK, Greer County, OK, Jackson County, OK, Kiowa County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 88 km from the middle of the area, began a volume at 14:45 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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, 2.8 hours before the alert went out and 153 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: 252 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

266 
WGUS54 KOUN 251445
FFWOUN
OKC009-055-065-075-149-251815-
/O.NEW.KOUN.FF.W.0098.170825T1445Z-170825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
945 AM CDT FRI AUG 25 2017

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Washita County in western Oklahoma...
  North central Jackson County in southwestern Oklahoma...
  Northern Kiowa County in southwestern Oklahoma...
  Eastern Greer County in southwestern Oklahoma...
  Southeastern Beckham County in western Oklahoma...

* Until 115 PM CDT
  
* At 944 AM CDT, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. Widespread rainfall 
  amounts of three inches of rain have already fallen with some 
  locations receiving as much as 6 inches. Additional heavy rain is 
  expected late this morning. Flash flooding is occurring or is 
  imminent.

* Some locations that will experience flooding include...
  Hobart, Cordell, Granite, Burns Flat, Sentinel, Blair, Mountain
  View, Dill City, Lone Wolf, Gotebo, Rocky, Willow, Retrop, Cloud
  Chief, Brinkman and Altus-Lugert Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3540 9931 3532 9876 3506 9862 3505 9862
      3477 9937 3502 9958

$$

11

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 Aug 25, 5:44 AM CDT, 4 hours 1 minute earlier.

Area forecast discussion, Aug 25, 5:44 AM CDT, 4 hours 1 minute before

Area Forecast Discussion
National Weather Service Norman OK
544 AM CDT Fri Aug 25 2017

.DISCUSSION...

&&

.AVIATION...
MVFR ceilings are expected over much of southwest and central
Oklahoma today with an area of rain and thunderstorms drifting
slowly north and northeast from southwest Oklahoma. Winds will
remain light southeast. Ceilings are expected to lift above MVFR
later in the afternoon or evening.

&&

.PREV DISCUSSION... /issued 329 AM CDT Fri Aug 25 2017/

DISCUSSION...
Scattered showers and thunderstorms are expected to persist
through the day, and especially the morning, over southwest and
into central Oklahoma. The very moist upslope flow is expected to
continue into the evening before weaker south winds and slightly
upper ridging take over. The very humid atmosphere persist through
Sunday when a front is expected to drift into Oklahoma overnight
and into Monday morning. Enhanced rain chances come then,
particularly over northern Oklahoma. The lingering front will
provide a focus during the day Monday over central and southern
Oklahoma. Modestly drier air will follow Tuesday with a continued
weak flow between the tropical system to the south, the upper
ridge to the west, and the westerlies to the north and east. By
mid-week, a chance for rain moves northward into southeast
Oklahoma with the exiting tropical system over eastern Texas,
although this will need to be watched for possible further
influence if the track of the low is farther north.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  82  67  86  68 /  40  20  20   0
Hobart OK         80  68  86  67 /  60  40  30  10
Wichita Falls TX  83  70  88  69 /  60  30  20  10
Gage OK           80  66  86  65 /  30  20  10   0
Ponca City OK     84  65  87  67 /   0  10  10   0
Durant OK         84  70  86  69 /  30  10  10  10

&&

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

26/09/09

Hazardous weather outlook, Aug 24, 10:50 PM CDT, 10 hours 55 minutes before

Hazardous Weather Outlook...updated
National Weather Service Norman OK
1050 PM CDT Thu Aug 24 2017

OKZ004>048-050>052-TXZ083>090-251030-
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-
1050 PM CDT Thu Aug 24 2017

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

.DAY ONE...Tonight...

.Thunderstorms...
Scattered showers and thundstorms are expected to develop
overnight across southwest Oklahoma and western north Texas. No
oganized severe weather is expected, although some localized
flooding may occur.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

.Thunderstorms...
Thunderstorm chances will increase Friday over western north
Texas and portions of southwestern Oklahoma. A few strong storms
could produce small hail and gusty winds. Localized heavy rainfall
will also be possible.

At least low chances of thunderstorms will continue Saturday for
most of Oklahoma and Texas. Thunderstorm chances will continue
Sunday, mainly along and north of Interstate 40. Organized severe
weather is not expected but localized heavy rainfall and gusty
winds will remain possible.

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 25, 9:26 AM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
926 AM CDT FRI AUG 25 2017

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

0920 AM     FLASH FLOOD      3 N OKLAHOMA CITY       35.51N 97.52W
08/25/2017                   OKLAHOMA           OK   DEPT OF HIGHWAYS

            ODOT SHUT DOWN I235 NB AT 36TH DUE TO
            FLOODING.

&&

MAD

Local storm report, Aug 25, 9:34 AM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
934 AM CDT FRI AUG 25 2017

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

0830 AM     FLASH FLOOD      1 WSW GRANITE           34.96N 99.40W
08/25/2017                   GREER              OK   PUBLIC

            SOCIAL MEDIA.

&&

MAD

Local storm report, Aug 25, 9:45 AM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
945 AM CDT FRI AUG 25 2017

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

0939 AM     FLASH FLOOD      1 ESE DEL CITY          35.44N 97.42W
08/25/2017                   OKLAHOMA           OK   FIRE DEPT/RESCUE

            STALLED VEHICLES IN BOTH RESIDENTIAL AND
            COMMERCIAL ROADWAYS.

&&

MAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 4:01 AM CDT	Areal Flood Advisory	OUN	Greer, Kiowa	119 min
Aug 25, 4:07 AM CDT	Areal Flood Advisory	OUN	Kiowa, Washita	3 hr
Aug 25, 4:23 AM CDT	Flash Flood Warning	OUN	Greer	6 hr
Aug 25, 5:00 AM CDT	Flash Flood Warning	OUN	Kiowa, Washita	3 hr
Aug 25, 5:07 AM CDT	Areal Flood Advisory	OUN	Kiowa	113 min
Aug 25, 6:03 AM CDT	Areal Flood Advisory	OUN	Roger Mills	3 hr
Aug 25, 6:27 AM CDT	Flash Flood Warning	OUN	Greer, Harmon	3 hr
Aug 25, 6:46 AM CDT	Areal Flood Advisory	OUN	Ellis, Roger Mills	3 hr
Aug 25, 7:22 AM CDT	Flash Flood Warning	OUN	Beckham, Greer, Kiowa, Washita	3 hr
Aug 25, 7:48 AM CDT	Areal Flood Advisory	OUN	Comanche, Cotton	117 min
Aug 25, 8:49 AM CDT	Flash Flood Warning	OUN	Oklahoma	3 hr
Aug 25, 8:59 AM CDT	Flash Flood Warning	OUN	Greer, Harmon, Jackson	4 hr
Aug 25, 9:12 AM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Kiowa	4 hr
Aug 25, 9:48 AM CDT	Areal Flood Advisory	OUN	Caddo	117 min
Aug 25, 11:26 AM CDT	Areal Flood Advisory	OUN	Comanche	3 hr
Aug 25, 11:45 AM CDT	Areal Flood Warning	OUN	Canadian, Oklahoma	4 hr
Aug 25, 12:32 PM CDT	Flash Flood Warning	OUN	Canadian, Oklahoma	3 hr
Aug 25, 1:02 PM CDT	Areal Flood Warning	OUN	Beckham, Caddo, Comanche, Cotton, Custer, Greer and 4 more	12 hr
Aug 25, 1:11 PM CDT	Areal Flood Advisory	OUN	Logan, Oklahoma	3 hr
Aug 25, 1:39 PM CDT	Areal Flood Advisory	OUN	Tillman	3 hr
Aug 25, 3:45 PM CDT	Areal Flood Warning	OUN	Canadian, Oklahoma	4 hr
Aug 25, 5:12 PM CDT	River Flood Warning	OUN	Greer, Jackson	10 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.