Alert archive / Oklahoma / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Norman, OK

April 8, 2012Murray County, Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 8, 2012, 8:40 AM CDT for Murray County, 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: Apr 8, 2012, 8:40 AM CDT (13:40 UTC)
Expired: Apr 8, 2012, 10:45 AM CDT
In force: 2 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Murray County, OK

The radar

The Norman radar (KTLX), 100 km from the middle of the area, began a volume at 13:40 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 8, 9:00 AM CDT	FLASH FLOOD	Turner Falls, OK	570 PEOPLE WERE EVACUATED DUE TO FLASH FLOODING OF HONEY CREEK. SEVERAL OF THOSE WERE UNABLE TO RETRIEVE THEIR VEHICLES DUE HIGH WATER OVER A LOW WATER CROSSING... BUT WERE EXPECTED TO BE ABLE TO DO SO MONDAY. THE TIME OF THE FLASH FLOODING IS APPROXIMATE.

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, 1.7 hours before the alert went out and 90 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

810 
WGUS54 KOUN 081340
FFWOUN
OKC099-081545-
/O.NEW.KOUN.FF.W.0002.120408T1340Z-120408T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
840 AM CDT SUN APR 8 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MURRAY COUNTY IN SOUTH CENTRAL OKLAHOMA...

* UNTIL 1045 AM CDT

* AT 837 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED HEAVY 
  RAIN. UP TO 2.5 INCHES OF RAIN HAS ALREADY FALLEN. FLASH FLOODING 
  IS LIKELY OCCURRING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE
  DAVIS...DOUGHERTY...TURNER FALLS AND LAKE OF THE ARBUCKLES. 

AN ADDITIONAL 1 TO 1.5 INCHES OF RAINFALL IS LIKELY OVER THE 
ARBUCKLE MOUNTAINS BEFORE 1045 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW 
LYING SPOTS.

IN HILLY TERRAIN MANY ROADS INCLUDE LOW WATER CROSSINGS WHICH ARE 
POTENTIALLY DANGEROUS IN HEAVY RAIN.  DO NOT ATTEMPT TO TRAVEL 
ACROSS FLOODED ROADS. FIND AN ALTERNATE ROUTE.  IT TAKES ONLY A 
FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3450 9726 3452 9702 3439 9691 3438 9697
      3438 9724

$$

WR

1 follow-up statement

678 
WGUS74 KOUN 081449
FFSOUN
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
949 AM CDT SUN APR 8 2012

OKC099-081545-
/O.CON.KOUN.FF.W.0002.000000T0000Z-120408T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MURRAY OK-
949 AM CDT SUN APR 8 2012

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT FOR 
MURRAY COUNTY...

AT 946 AM CDT...MODERATE AND HEAVY RAIN CONTINUES OVER THE ARBUCKLE 
MOUNTAINS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DAVIS...DOUGHERTY...TURNER FALLS AND LAKE OF THE ARBUCKLES. 

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 1.5 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...DRY CREEK...
CHIGLEY SANDY CREEK...COLBERT CREEK...DRY SANDY CREEK...WASHITA 
RIVER...ROCK CREEK...BOARD HOLLOW CREEK...HENRY HOUSE CREEK...
SANDY BEAR CREEK...HONEY CREEK...GARRISON CREEK...PHILIPS CREEK...
COOL CREEK...DEEL CREEK...FALLS CREEK...LICK CREEK AND OIL CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND AS WELL 
AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH 
ARE POTENTIALLY DANGEROUS IN HEAVY RAIN.  DO NOT ATTEMPT TO TRAVEL 
ACROSS FLOODED ROADS. FIND AN ALTERNATE ROUTE.  IT TAKES ONLY A 
FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR 
OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND 
IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE 
IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT 
TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT 
OR BY AUTOMOBILE. 

&&

LAT...LON 3450 9726 3452 9702 3439 9691 3438 9697
      3438 9724

$$

WR

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 12:50 AM CDT	Special Weather Statement	OUN	Murray	25 min
Apr 8, 1:01 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Johnston, Murray, Pontotoc	59 min
Apr 8, 1:10 AM CDT	Special Weather Statement	OUN	Cotton	50 min
Apr 8, 1:17 AM CDT	Special Weather Statement	OUN	Garvin	28 min
Apr 8, 1:21 AM CDT	Special Weather Statement	OUN	Murray	24 min
Apr 8, 1:48 AM CDT	Special Weather Statement	OUN	Murray	42 min
Apr 8, 1:58 AM CDT	Special Weather Statement	OUN	Stephens	32 min
Apr 8, 2:00 AM CDT	Special Weather Statement	OUN	Pontotoc	30 min
Apr 8, 2:28 AM CDT	Special Weather Statement	OUN	Cotton	47 min
Apr 8, 2:33 AM CDT	Special Weather Statement	OUN	Pontotoc	27 min
Apr 8, 2:57 AM CDT	Special Weather Statement	OUN	Johnston	48 min
Apr 8, 4:08 AM CDT	Special Weather Statement	OUN	Marshall	52 min
Apr 8, 4:58 AM CDT	Special Weather Statement	OUN	Marshall	47 min
Apr 8, 5:43 AM CDT	Special Weather Statement	OUN	Bryan	32 min
Apr 8, 8:12 AM CDT	Special Weather Statement	OUN	Murray	48 min
Apr 8, 8:21 AM CDT	Areal Flood Advisory	OUN	Murray	114 min
Apr 8, 8:45 AM CDT	Areal Flood Advisory	OUN	Love, Marshall	3 hr
Apr 8, 9:45 AM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Marshall, Murray	3 hr
Apr 8, 10:28 AM CDT	Special Weather Statement	OUN	Seminole	47 min
Apr 8, 10:59 AM CDT	Areal Flood Advisory	OUN	Murray	3 hr

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.