Alert archive / Oklahoma / Flash Flood Warnings in 2018

Flash Flood Warning 79, NWS Norman, OK

October 7, 20184 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at Oct 7, 2018, 9:22 PM CDT for 4 counties in Oklahoma. It was in force for 2 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: Oct 7, 2018, 9:22 PM CDT (02:22 UTC)
Expired: Oct 7, 2018, 11:45 PM CDT
In force: 2 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Blaine County, OK, Caddo County, OK, Custer County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 124 km from the middle of the area, began a volume at 02:24 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
Oct 7, 10:02 PM CDT	FLASH FLOOD	Cordell, OK	REPORTS OF POLICE CAR FLOODED IN CITY STREETS.

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 40 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 00:00Z, 2.4 hours before the alert went out and 134 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: 864 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 11.1

Open this sounding in Storm Lab

The text

As transmitted.

877 
WGUS54 KOUN 080222
FFWOUN
OKC011-015-039-149-080445-
/O.NEW.KOUN.FF.W.0079.181008T0222Z-181008T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
922 PM CDT SUN OCT 7 2018

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Washita County in western Oklahoma...
  Northwestern Caddo County in southwestern Oklahoma...
  Southern Custer County in western Oklahoma...
  Southwestern Blaine County in northwestern Oklahoma...

* Until 1145 PM CDT.
  
* At 920 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two to three inches of 
  rain have already fallen over parts of the warned area. Flash 
  flooding is occurring or is imminent.

* Some locations that will experience flooding include...
  Weatherford, Clinton, Cordell, Burns Flat, Hydro, Arapaho, Dill
  City, Canute, Corn, Custer City, Bessie, Foss, Colony, Cloud Chief,
  Foss Reservoir and Stafford.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3576 9864 3566 9834 3548 9846 3525 9878
      3522 9916 3514 9935 3549 9937

$$

TL

2 follow-up statements

496 
WGUS74 KOUN 080300
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
1000 PM CDT SUN OCT 7 2018

OKC011-015-039-149-080445-
/O.CON.KOUN.FF.W.0079.000000T0000Z-181008T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washita OK-Caddo OK-Custer OK-Blaine OK-
1000 PM CDT SUN OCT 7 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR
WASHITA...NORTHWESTERN CADDO...SOUTHERN CUSTER AND SOUTHWESTERN
BLAINE COUNTIES...

At 959 PM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain over the warned area. Between 
three and five inches of rain have fallen over the warned area 
today. Flash flooding is expected to begin shortly.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3576 9864 3566 9834 3548 9846 3525 9878
      3522 9916 3514 9935 3549 9937

$$

TL

715 
WGUS74 KOUN 080335
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
1035 PM CDT SUN OCT 7 2018

OKC011-015-039-149-080445-
/O.CON.KOUN.FF.W.0079.000000T0000Z-181008T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washita OK-Caddo OK-Custer OK-Blaine OK-
1035 PM CDT SUN OCT 7 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR
WASHITA...NORTHWESTERN CADDO...SOUTHERN CUSTER AND SOUTHWESTERN
BLAINE COUNTIES...

At 1020 PM CDT, local law enforcement in Cordell reported widespread 
flash flooding in the town of Cordell.  The Cordell Police 
Department encouraged residents to remain off of city streets.

The threat for flash flooding also appears to be increasing in the 
Weatherford area.

Upwards of 5 inches of rain have fallen over the warned area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3576 9864 3566 9834 3548 9846 3525 9878
      3522 9916 3514 9935 3549 9937

$$

TL

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 Oct 7, 6:47 PM CDT, 2 hours 35 minutes earlier.

Area forecast discussion, Oct 7, 6:47 PM CDT, 2 hours 35 minutes before

Area Forecast Discussion
National Weather Service Norman OK
647 PM CDT Sun Oct 7 2018

.DISCUSSION...

&&

.AVIATION...
Rain and thunderstorms will persist through Monday, more
widespread over the western third of Oklahoma. IFR conditions in
low ceilings are expected overnight north of a front in western
and northern Oklahoma, with MVFR conditions in most other areas
and continuing through the day Monday.

&&

.PREV DISCUSSION... /issued 404 PM CDT Sun Oct 7 2018/

DISCUSSION...
A slow moving warm front will continue to lift across Central
Oklahoma, as an upper long wave trough will continue to approach
from the west. Rain showers behind the warm front will remain more
scattered through this evening across southeast into portions of
central Oklahoma. However the meridional flow aloft across
western Oklahoma will maintain widespread showers and isolated
thunderstorms across our west and into northwest Oklahoma through
this evening. There is sufficient instability and marginal shear
for a few of the stronger storms to become severe, especially this
evening as a low level jet increases. A marginal risk is in place
across most of our area, with winds and flooding as the main
hazards.

Meanwhile, moisture from a strengthening tropical cyclone in the
Gulf of Mexico will continue to increase across the southern
plains for the next couple of days. The increasing moisture will
be interacting with the aforementioned upper trough as it starts
digging into our area early this week, maintaining periods of
showers and thunderstorms through at least Tuesday night.
Flooding will also be a hazard, with another 2-3 inches expected
in addition to todays rainfall. A cold front will begin moving
through late Thursday, ending the rain and bringing in much
unseasonably cooler air for the rest of the seven day period.

By Friday, an upper short wave will bring back chances for rain
into Saturday. However at this point, the atmosphere is expected
to remain stable enough to inhibit any thunderstorm development.
The rain chances also remain low, as sufficient moisture return is
in question.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  74  69  77  67 /  80  70  50  80
Hobart OK         73  68  75  63 /  80  80  80  90
Wichita Falls TX  80  70  80  68 /  80  70  60  80
Gage OK           63  59  72  56 /  80  80  80  80
Ponca City OK     70  67  80  68 /  80  80  50  80
Durant OK         82  70  82  70 /  80  30  30  40

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Flood Watch through Tuesday evening for OKZ004>048-050>052.

TX...Flood Watch through Tuesday evening for TXZ083>090.

&&

26/09/09

Hazardous weather outlook, Oct 7, 7:12 PM CDT, 2 hours 10 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
712 PM CDT Sun Oct 7 2018

OKZ004>048-050>052-TXZ083>090-082215-
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-
712 PM CDT Sun Oct 7 2018

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

.DAY ONE...Through Tonight...

.Thunderstorms...
Showers and scattered thunderstorms will continue across
Oklahoma and northern Texas through Monday morning. Some
of the storms could be severe through 10 PM Sunday. Damaging
wind gusts up to 60 mph, hail up to the size of quarters,
and very heavy rainfall are the hazards. A few funnel clouds
or brief tornado are also possible with the strongest
storms.

.Heavy rain...
Heavy rainfall is likely through tonight, which could cause
flooding and flash flooding in some areas.

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

.Thunderstorms...
Showers and thunderstorms will continue across parts of Oklahoma
and north Texas through Tuesday. Strong to severe storms will be
possible at times, especially during the late afternoon and
evening hours. Large hail and damaging wind gusts will be the
primary hazards with any severe storms. Heavy rainfall associated
with the stronger storms could cause localized flooding.

After a brief break, thunderstorm chances return late this week.

.Heavy Rain...
Widespread moderate to heavy rainfall is likely through Tuesday,
which could lead to flooding and flash flooding, especially of
low lying and poorly drained areas. The prolonged period of
moderate to heavy rains will also create elevated levels on
mainstem rivers.

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, Oct 7, 7:04 PM CDT, 2 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
704 PM CDT SUN OCT 7 2018

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

0700 PM     FLASH FLOOD      CARNEGIE                35.10N 98.60W
10/07/2018                   CADDO              OK   LAW ENFORCEMENT

            FLASH FLOODING WITH DEPTHS UP TO 3 FEET ON RESIDENTIAL
            STREETS.

&&

JT/FM

Local storm report, Oct 7, 8:08 PM CDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
808 PM CDT SUN OCT 7 2018

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

0804 PM     FLASH FLOOD      MANGUM                  34.88N 99.50W
10/07/2018                   GREER              OK   FIRE DEPT/RESCUE

            FLOOD WATERS HAVE RESULTED IN CLOSURE OF SEVERAL STREETS
            AND FLOODING INTO HOMES.

&&

TLINDLEY

Local storm report, Oct 7, 8:18 PM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
818 PM CDT SUN OCT 7 2018

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

0800 PM     FLASH FLOOD      1 N ROOSEVELT           34.86N 99.02W
10/07/2018                   KIOWA              OK   PUBLIC

            WATER 1 TO 2 FEET DEEP.

&&

JT/FM

Local storm report, Oct 7, 8:19 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
819 PM CDT SUN OCT 7 2018

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

0422 PM     TORNADO          1 S SNYDER              34.64N 98.95W
10/07/2018                   KIOWA              OK   STORM CHASER

            A BRIEF TORNADO REPORTED BY A FEW STORM CHASERS. THE
            LOCATION IS ESTIMATED.

0510 PM     TORNADO          12 ENE COOPERTON        34.93N 98.68W
10/07/2018                   KIOWA              OK   STORM CHASER

            TORNADO OBSERVED BY STORM CHASERS APPROXIMATELY 3 MILES
            NORTHEAST OF SADDLE MOUNTAIN.

&&

Special weather statement, Oct 7, 8:59 PM CDT, 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
859 PM CDT SUN OCT 7 2018

OKZ018-019-024-025-080230-
Kingfisher OK-Oklahoma OK-Logan OK-Canadian OK-
859 PM CDT SUN OCT 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Kingfisher...
northwestern Oklahoma...southwestern Logan and northeastern Canadian
Counties Until 930 PM CDT....

AT 857 PM CDT, strong thunderstorms were along a line extending from
near Cashion to northwest Oklahoma City just northwest of Bethany.
The storms were moving northeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...
Heavy rainfall producing areas of flooding...

LAT...LON 3605 9745 3555 9744 3545 9773 3589 9776
TIME...MOT...LOC 0157Z 244DEG 19KT 3585 9769 3552 9767

..speg.

Local storm report, Oct 7, 9:10 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
910 PM CDT SUN OCT 7 2018

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

0600 PM     FLASH FLOOD      5 N ALTUS               34.72N 99.33W
10/07/2018                   JACKSON            OK   TRAINED SPOTTER

            9 INCHES OF WATER FLOWING OVER HWY 283. 5.6 INCHES OF
            RAINFALL MEASURED IN 3.5 HOURS.

&&

TLINDLEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 7:16 PM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Canadian, Kingfisher, Logan	5 hr
Oct 7, 7:42 PM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Greer, Jackson, Kiowa, Washita	4 hr
Oct 7, 8:13 PM CDT	Flash Flood Warning	OUN	Blaine, Caddo, Canadian, Grady, Kingfisher	4 hr
Oct 7, 8:22 PM CDT	Areal Flood Advisory	OUN	Beckham, Blaine, Caddo, Custer, Washita	4 hr
Oct 7, 8:35 PM CDT	Areal Flood Advisory	OUN	Canadian, Kingfisher, Logan, Oklahoma	3 hr
Oct 7, 8:55 PM CDT	River Flood Warning	OUN	Blaine, Caddo, Canadian, Custer	4 days
Oct 7, 8:59 PM CDT	Special Weather Statement	OUN	Logan	31 min
Oct 7, 9:30 PM CDT	Special Weather Statement	OUN	Logan	30 min
Oct 7, 10:20 PM CDT	Areal Flood Advisory	OUN	Beckham, Greer	115 min
Oct 7, 10:44 PM CDT	Flash Flood Warning	OUN	Blaine, Custer, Dewey	61 min
Oct 7, 11:31 PM CDT	Areal Flood Warning	OUN	Blaine, Caddo, Comanche, Custer, Greer, Jackson and 2 more	6 hr
Oct 7, 11:34 PM CDT	Areal Flood Advisory	OUN	Beckham, Custer, Dewey, Roger Mills	3 hr
Oct 7, 11:40 PM CDT	Flash Flood Warning	OUN	Blaine, Custer	3 hr
Oct 8, 12:04 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant, Major	3 hr
Oct 8, 1:04 AM CDT	Areal Flood Advisory	OUN	Garfield, Grant, Kay	3 hr
Oct 8, 2:35 AM CDT	River Flood Warning	OUN	Blaine, Canadian	58 hr
Oct 8, 2:59 AM CDT	River Flood Warning	OUN	Atoka	67 hr
Oct 8, 4:12 AM CDT	Areal Flood Advisory	OUN	Harper, Woods, Woodward	3 hr
Oct 8, 9:06 AM CDT	Areal Flood Advisory	OUN	Dewey, Major, Woods, Woodward	3 hr
Oct 8, 9:25 AM CDT	River Flood Warning	OUN	Grant, Kay	4 days
Oct 8, 9:26 AM CDT	River Flood Warning	OUN	Blaine, Kingfisher, Major	3 days
Oct 8, 9:49 AM CDT	River Flood Warning	OUN	Custer, Washita	48 hr
Oct 8, 9:51 AM CDT	River Flood Warning	OUN	Caddo, Kiowa, Washita	4 days
Oct 8, 9:56 AM CDT	River Flood Warning	OUN	Caddo, Garvin, Grady	6 days
Oct 8, 10:15 AM CDT	River Flood Warning	OUN	Canadian	55 hr
Oct 8, 10:16 AM CDT	River Flood Warning	OUN	Canadian, Oklahoma	4 days
Oct 8, 11:34 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Blaine, Dewey, Garfield, Grant, Major and 1 more	3 hr
Oct 8, 11:59 AM CDT	Special Weather Statement	OUN	Grant	31 min
Oct 8, 12:42 PM CDT	Special Weather Statement	OUN	Grant	18 min
Oct 8, 12:59 PM CDT	Severe Thunderstorm Warning	OUN	Grant	14 min
Oct 8, 1:54 PM CDT	Special Weather Statement	OUN	Garfield	51 min
Oct 8, 2:35 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant, Major	4 hr
Oct 8, 4:01 PM CDT	River Flood Warning	OUN	Grant, Kay, Noble	4 days
Oct 8, 5:20 PM CDT	Areal Flood Advisory	OUN	Canadian, Grady	3 hr
Oct 8, 5:30 PM CDT	Areal Flood Advisory	OUN	Kingfisher	3 hr
Oct 8, 6:02 PM CDT	Areal Flood Advisory	OUN	Cleveland, Oklahoma	118 min

Nearby

Flash Flood Warnings in Oklahoma, 2018 Every flash flood warning in 2018

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.