Alert archive / Oklahoma / Flash Flood Warnings in 2015

Flash Flood Warning 13, NWS Norman, OK

May 8, 20155 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at May 8, 2015, 6:30 PM CDT for 5 counties in Oklahoma. It was in force for 4 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: May 8, 2015, 6:30 PM CDT (23:30 UTC)
Expired: May 8, 2015, 10:30 PM CDT
In force: 4 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Cleveland County, OK, Lincoln County, OK, Oklahoma County, OK, Pottawatomie County, OK, Seminole County, OK

What was reported inside it

Time	Report	Where	Remark
May 8, 9:22 PM CDT	FLASH FLOOD	Seminole, OK	FLOODING OF SEVERAL MAJOR AND SECONDARY ROADS.

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

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 68 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: 171 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

756 
WGUS54 KOUN 082330
FFWOUN
OKC027-081-109-125-133-090330-
/O.NEW.KOUN.FF.W.0013.150508T2330Z-150509T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
630 PM CDT FRI MAY 8 2015

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN SEMINOLE COUNTY IN EAST CENTRAL OKLAHOMA...
  SOUTHEASTERN OKLAHOMA COUNTY IN CENTRAL OKLAHOMA...
  SOUTHERN LINCOLN COUNTY IN CENTRAL OKLAHOMA...
  POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA...
  NORTHEASTERN CLEVELAND COUNTY IN CENTRAL OKLAHOMA...

* UNTIL 1030 PM CDT
    
* AT 630 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORM PRODUCING   
  HEAVY RAIN WITH RATES UP TO TWO INCHES PER HOUR. THIS OVER AN AREA 
  THAT HAS RECEIVED 2 TO 5 INCHES OF RAINFALL IN RECENT DAYS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SHAWNEE...SEMINOLE...TECUMSEH...CHANDLER...HARRAH...MCLOUD...
  WEWOKA...STROUD...PRAGUE...PINK...MEEKER...MAUD...DAVENPORT...
  EARLSBORO...BOWLEGS...TRIBBEY...CROMWELL...JOHNSON...SPARKS AND
  WARWICK.

ADDITIONAL RAINFALL AMOUNTS OF 2 INCHES ARE POSSIBLE IN THE WARNED 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

&&

LAT...LON 3510 9720 3563 9719 3578 9662 3540 9662
      3540 9660 3539 9654 3544 9657 3543 9651
      3544 9648 3546 9648 3545 9644 3513 9644

$$

1 follow-up statement

760 
WGUS74 KOUN 090157
FFSOUN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
857 PM CDT FRI MAY 8 2015

OKC027-081-109-125-133-090330-
/O.CON.KOUN.FF.W.0013.000000T0000Z-150509T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SEMINOLE OK-OKLAHOMA OK-LINCOLN OK-POTTAWATOMIE OK-CLEVELAND OK-
857 PM CDT FRI MAY 8 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT FOR
NORTHERN SEMINOLE...SOUTHEASTERN OKLAHOMA...SOUTHERN LINCOLN...
POTTAWATOMIE AND NORTHEASTERN CLEVELAND COUNTIES...

AT 854 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
HEAVY RAIN ACROSS THE WARNED AREA. BETWEEN 1 AND 3 INCHES OF RAIN 
HAS ALREADY FALLEN.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 INCH ARE POSSIBLE ARE 
POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.  MOVE TO HIGHER GROUND.

&&

LAT...LON 3510 9720 3563 9719 3578 9662 3540 9662
      3540 9660 3539 9654 3544 9657 3543 9651
      3544 9648 3546 9648 3545 9644 3513 9644

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 7:29 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Love, Marshall	2 hr
May 7, 7:35 PM CDT	Special Weather Statement	OUN	Love	25 min
May 7, 7:41 PM CDT	Tornado Warning	OUN	Love	34 min
May 7, 8:27 PM CDT	Special Weather Statement	OUN	Bryan	33 min
May 7, 8:34 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Marshall	41 min
May 7, 9:41 PM CDT	Special Weather Statement	OUN	Atoka	34 min
May 7, 9:57 PM CDT	Areal Flood Advisory	OUN	Bryan, Marshall	2 hr
May 7, 11:58 PM CDT	Flash Flood Warning	OUN	Bryan	3 hr
May 8, 2:23 AM CDT	River Flood Warning	OUN	Bryan	28 hr
May 8, 4:36 AM CDT	Dense Fog Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 17 more	5 hr
May 8, 12:30 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	45 min
May 8, 1:10 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	50 min
May 8, 1:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa	50 min
May 8, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	48 min
May 8, 2:26 PM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	54 hr
May 8, 2:26 PM CDT	River Flood Warning	OUN	Comanche, Cotton	3 days
May 8, 2:33 PM CDT	Special Weather Statement	OUN	Caddo, Washita	42 min
May 8, 2:41 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	49 min
May 8, 2:48 PM CDT	Areal Flood Advisory	OUN	Greer, Harmon, Jackson, Kiowa, Washita	3 hr
May 8, 3:21 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	39 min
May 8, 3:23 PM CDT	Special Weather Statement	OUN	Canadian	37 min
May 8, 3:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Washita	50 min
May 8, 3:55 PM CDT	Tornado Warning	OUN	Jackson, Tillman	50 min
May 8, 4:02 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Kingfisher	43 min
May 8, 4:16 PM CDT	Flash Flood Warning	OUN	Caddo, Greer, Harmon, Jackson, Kiowa, Washita	3 hr
May 8, 4:27 PM CDT	Flash Flood Warning	OUN	Caddo, Canadian, Cleveland, Grady, Kiowa, McClain and 1 more	6 hr
May 8, 4:28 PM CDT	Tornado Warning Tornado observed	OUN	Tillman	47 min
May 8, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Kiowa, Washita	38 min
May 8, 4:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	50 min
May 8, 4:52 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	38 min
May 8, 4:54 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	51 min
May 8, 5:05 PM CDT	Tornado Warning Tornado observed	OUN	Cotton, Tillman	40 min
May 8, 5:10 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	50 min
May 8, 5:37 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens, Tillman	68 min
May 8, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	48 min
May 8, 6:01 PM CDT	Special Weather Statement	OUN	Cleveland	29 min
May 8, 6:04 PM CDT	Special Weather Statement	OUN	Comanche	26 min
May 8, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Pottawatomie	52 min
May 8, 6:14 PM CDT	Tornado Warning Tornado observed	OUN	Cotton, Jefferson	46 min
May 8, 6:20 PM CDT	Areal Flood Advisory	OUN	Kay, Noble, Payne	3 hr
May 8, 6:29 PM CDT	Special Weather Statement	OUN	Stephens	31 min
May 8, 6:39 PM CDT	Areal Flood Advisory	OUN	Canadian, Lincoln, Logan, Noble, Oklahoma, Payne	3 hr
May 8, 6:41 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Tillman	64 min
May 8, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Jefferson, Stephens	75 min
May 8, 6:53 PM CDT	Flash Flood Warning	OUN	Comanche, Cotton, Jefferson, Stephens	4 hr
May 8, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	52 min
May 8, 6:56 PM CDT	Tornado Warning Tornado observed	OUN	Jefferson	35 min
May 8, 6:59 PM CDT	Tornado Warning	OUN	Lincoln, Pottawatomie, Seminole	31 min

Nearby

Flash Flood Warnings in Oklahoma, 2015 Every flash flood warning in 2015

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.