Alert archive / Oklahoma / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Shreveport, LA

January 25, 2012McCurtain County, Oklahoma

NWS Shreveport, LA issued this flash flood warning at Jan 25, 2012, 10:48 AM CST for McCurtain County, 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: Jan 25, 2012, 10:48 AM CST (16:48 UTC)
Expired: Jan 25, 2012, 4:45 PM CST
In force: 6 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 158 km from the middle of the area, began a volume at 16:47 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
Jan 25, 3:07 PM CST	FLASH FLOOD	Glover, OK	FLASH FLOOD ON THE GLOVER RIVER...ABOVE FLOOD STAGE CAUSING MINOR FLOODING IN LOW LYING AREAS NEAR THE RIVER

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 4.8 hours before the alert went out and 186 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: 3 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 314 m²/s²
0-3 km storm-relative helicity: 484 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.

652 
WGUS54 KSHV 251648
FFWSHV
OKC089-252245-
/O.NEW.KSHV.FF.W.0001.120125T1648Z-120125T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1048 AM CST WED JAN 25 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MCCURTAIN COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 445 PM CST

* AT 1043 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
VERY HEAVY RAIN FROM SHOWERS AND THUNDERSTORMS OVER THE WARNED AREA. 
DOPPLER RADAR AND GROUND REPORTS INDICATE THAT 2 TO 4 INCHES OF RAIN 
HAS ALREADY FALLEN IN THE COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WATSON...
  SMITHVILLE...SHERWOOD...RINGOLD...PLUNKETVILLE...PICKENS...MOUNT
  HERMAN...HOCHATOWN...BETHEL...BEACHTON AND BATTIEST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA THROUGH THIS AFTERNOON

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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 ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3450 9446 3362 9451 3366 9455 3365 9458
      3367 9456 3369 9459 3367 9459 3374 9482
      3377 9482 3375 9483 3376 9486 3380 9492
      3383 9492 3382 9495 3386 9498 3395 9516
      3424 9515 3425 9506 3450 9504

$$

04

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 25, 8:06 AM CST	River Flood Warning	SHV	McCurtain	20 hr
Jan 25, 9:41 AM CST	Flash Flood Watch	SHV	McCurtain	11 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.