Alert archive / Oklahoma / Flash Flood Warnings in 2012

Flash Flood Warning 4, NWS Norman, OK

April 30, 20124 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 30, 2012, 1:27 AM CDT for 4 counties in Oklahoma. It was in force for 6 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: Apr 30, 2012, 1:27 AM CDT (06:27 UTC)
Expired: Apr 30, 2012, 7:30 AM CDT
In force: 6 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK

The radar

The Vance AFB radar (KVNX), 95 km from the middle of the area, began a volume at 06:30 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
Apr 30, 1:42 AM CDT	FLASH FLOOD	4 Nnw Tonkawa, OK	6 TO 8 INCHES OF WATER COVERING INTERSTATE 35. REPORTED BY OHP

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

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 6.5 hours before the alert went out and 38 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: 2178 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

706 
WGUS54 KOUN 300627
FFWOUN

OKC047-053-071-103-301230-
/O.NEW.KOUN.FF.W.0004.120430T0627Z-120430T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
127 AM CDT MON APR 30 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KAY COUNTY IN  OKLAHOMA...
  GRANT COUNTY IN  OKLAHOMA...
  EXTREME NORTH CENTRAL GARFIELD COUNTY IN  OKLAHOMA...
  EXTREME NORTH CENTRAL NOBLE COUNTY IN  OKLAHOMA...

* UNTIL 730 AM CDT

* AT 120 AM CDT...NATIONAL WEATHER SERVICE RADAR AND RAIN GAUGES 
  INDICATED THAT HEAVY RAIN WAS FALLING OVER THE AREA. FOUR TO 
  SEVEN INCHES OF RAIN IN SIX HOURS HAS ALREADY FALLEN. FLASH 
  FLOODING IS ALREADY OCCURRING. MULTIPLE STREETS HAVE BEEN REPORTED 
  TO BE FLOODED AND CLOSED IN PONCA CITY AND BLACKWELL.

* ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN 
  THE WARNED AREA.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE
  PONCA CITY...BLACKWELL...TONKAWA...NEWKIRK...MEDFORD...POND CREEK...
  LAMONT...BILLINGS...WAKITA...KAW CITY...MARLAND...BRAMAN...KREMLIN...
  NASH...HUNTER...DEER CREEK...MANCHESTER...HILLSDALE...KILDARE...
  NARDIN...JEFFERSON...RENFROW...CHILOCCO...HARDY AND KAW LAKE. 



PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. 
MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS.  DO NOT DRIVE 
VEHICLES INTO AREAS WHERE WATER COVERS THE ROADWAY.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE 
INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE 
USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS 
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING 
FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DON'T DROWN.

&&

LAT...LON 3678 9678 3674 9683 3675 9689 3668 9695
      3670 9704 3668 9707 3659 9705 3660 9692
      3657 9689 3655 9691 3653 9695 3649 9809
      3700 9804 3699 9676

$$

MAXWELL

1 follow-up statement

312 
WGUS74 KOUN 301116
FFSOUN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
616 AM CDT MON APR 30 2012

OKC047-053-071-103-301230-
/O.CON.KOUN.FF.W.0004.000000T0000Z-120430T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KAY OK-GRANT OK-GARFIELD OK-NOBLE OK-
616 AM CDT MON APR 30 2012

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT FOR 
KAY...GRANT...EXTREME NORTH CENTRAL GARFIELD AND EXTREME NORTH 
CENTRAL NOBLE COUNTIES...

ALTHOUGH THE HEAVY RAINFALL HAS ENDED ACROSS THE WARNED AREA... 
FLASH FLOODING WILL REMAIN LIKELY THIS MORNING DUE TO THE VERY HEAVY 
RAINFALL THAT OCCURRED SUNDAY NIGHT AND EARLY MONDAY MORNING. THREE 
TO TEN INCHES OF RAIN HAS FALLEN ACROSS MUCH OF THE WARNING AREA 
WHICH WILL LEAD TO CONTINUED RUNOFF AND FLOODING THIS MORNING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PONCA CITY...BLACKWELL...TONKAWA...NEWKIRK...MEDFORD...POND CREEK...
LAMONT...BILLINGS...WAKITA...KAW CITY...MARLAND...BRAMAN...KREMLIN...
NASH...HUNTER...DEER CREEK...MANCHESTER...HILLSDALE...KILDARE...
NARDIN...JEFFERSON...RENFROW...CHILOCCO...HARDY AND PECKHAM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. 
MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS.  DO NOT STAY IN 
AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. 

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE 
INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE 
USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS 
POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING 
FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3678 9678 3674 9683 3675 9689 3668 9695
      3670 9704 3668 9707 3659 9705 3660 9692
      3657 9689 3655 9691 3653 9695 3649 9809
      3700 9804 3699 9676

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:16 PM CDT	Special Weather Statement	OUN	Noble	29 min
Apr 29, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	44 min
Apr 29, 8:20 PM CDT	Special Weather Statement	OUN	Garfield	25 min
Apr 29, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Major	61 min
Apr 29, 8:41 PM CDT	Special Weather Statement	OUN	Major	34 min
Apr 29, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	40 min
Apr 29, 9:02 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	43 min
Apr 29, 9:12 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	48 min
Apr 29, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	24 min
Apr 29, 9:39 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Major, Woodward	45 min
Apr 29, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	48 min
Apr 29, 9:45 PM CDT	Special Weather Statement	OUN	Harper	30 min
Apr 29, 9:50 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	40 min
Apr 29, 9:59 PM CDT	Tornado Warning	OUN	Kay	31 min
Apr 29, 10:17 PM CDT	Special Weather Statement	OUN	Grant	28 min
Apr 29, 10:22 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay	38 min
Apr 29, 10:27 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	48 min
Apr 29, 10:29 PM CDT	Special Weather Statement	OUN	Major	31 min
Apr 29, 10:29 PM CDT	Tornado Warning	OUN	Kay	13 min
Apr 29, 10:37 PM CDT	Flash Flood Warning	OUN	Garfield, Grant, Kay, Noble	3 hr
Apr 29, 10:50 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	40 min
Apr 29, 10:52 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	38 min
Apr 29, 11:30 PM CDT	Special Weather Statement	OUN	Ellis	30 min
Apr 29, 11:32 PM CDT	Special Weather Statement	OUN	Major	28 min
Apr 29, 11:38 PM CDT	Special Weather Statement	OUN	Roger Mills	37 min
Apr 29, 11:43 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods	3 hr
Apr 29, 11:45 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	45 min
Apr 29, 11:52 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Major	38 min
Apr 29, 11:57 PM CDT	Special Weather Statement	OUN	Roger Mills	33 min
Apr 30, 12:34 AM CDT	Special Weather Statement	OUN	Grant, Kay	41 min
Apr 30, 12:42 AM CDT	Special Weather Statement	OUN	Grant, Kay	33 min
Apr 30, 12:54 AM CDT	Areal Flood Advisory	OUN	Garfield	3 hr
Apr 30, 1:01 AM CDT	Special Weather Statement	OUN	Dewey	29 min
Apr 30, 1:11 AM CDT	Special Weather Statement	OUN	Kay, Noble	34 min
Apr 30, 1:45 AM CDT	Special Weather Statement	OUN	Kingfisher	30 min
Apr 30, 2:27 AM CDT	River Flood Warning	OUN	Grant, Kay, Noble	4 days
Apr 30, 4:14 AM CDT	Flash Flood Watch	OUN	Alfalfa, Garfield, Grant, Kay, Major, Noble and 2 more	24 hr
Apr 30, 7:32 AM CDT	Areal Flood Warning	OUN	Garfield, Grant, Kay, Noble	3 hr
Apr 30, 4:31 PM CDT	Special Weather Statement	OUN	Atoka	29 min
Apr 30, 5:01 PM CDT	Special Weather Statement	OUN	Atoka	29 min
Apr 30, 5:27 PM CDT	Special Weather Statement	OUN	Harper	33 min
Apr 30, 6:08 PM CDT	Special Weather Statement	OUN	Woods	37 min
Apr 30, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	50 min
Apr 30, 6:58 PM CDT	Special Weather Statement	OUN	Alfalfa	32 min

Nearby

Flash Flood Warnings in Oklahoma, 2012 Every flash flood warning in 2012

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.