Alert archive / Arkansas / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS Memphis, TN

May 7, 2012Clay County, Randolph County, Arkansas

NWS Memphis, TN issued this flash flood warning at May 7, 2012, 1:41 AM CDT for Clay County, Randolph County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 7, 2012, 1:41 AM CDT (06:41 UTC)
Expired: May 7, 2012, 4:45 AM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Clay County, AR, Randolph County, AR

The radar

The Memphis radar (KNQA), 133 km from the middle of the area, began a volume at 06:44 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 6.7 hours before the alert went out and 183 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: 1694 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

578 
WGUS54 KMEG 070641
FFWMEG
ARC021-121-070945-
/O.NEW.KMEG.FF.W.0018.120507T0641Z-120507T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
141 AM CDT MON MAY 7 2012

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN CLAY COUNTY IN EASTERN ARKANSAS...
  EXTREME NORTHEASTERN RANDOLPH COUNTY IN EASTERN ARKANSAS...

* UNTIL 445 AM CDT

* AT 141 AM CDT...DOPPLER RADAR ESTIMATES 2 TO 4 INCHES OF RAINFALL
  HAS OCCURRED OVER THE PAST HOUR. SHOWERS AND THUNDERSTORMS WILL
  PRODUCE AN ADDITIONAL 1 TO 3 INCHES OF RAIN OVER THE NEXT HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CORNING.

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.

.STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT FLASH FLOODING ONLY...CALL 1 800 4 3 2 0 8 7 5.

&&

LAT...LON 3627 9048 3628 9078 3649 9078 3650 9054
      3650 9052

$$

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 6, 7:30 PM CDT	Special Weather Statement	MEG	Clay	30 min
May 6, 7:33 PM CDT	Special Weather Statement	MEG	Greene	27 min
May 6, 7:44 PM CDT	Special Weather Statement	MEG	Mississippi	31 min
May 6, 7:58 PM CDT	Severe Thunderstorm Warning	MEG	Mississippi	47 min
May 6, 8:24 PM CDT	Special Weather Statement	MEG	Clay	36 min
May 6, 8:44 PM CDT	Special Weather Statement	MEG	Mississippi	31 min
May 6, 9:21 PM CDT	Special Weather Statement	MEG	Mississippi	39 min
May 6, 9:49 PM CDT	Flash Flood Warning	MEG	Mississippi	3 hr
May 7, 1:07 AM CDT	Special Weather Statement	MEG	Mississippi	23 min
May 7, 1:11 AM CDT	Special Weather Statement	MEG	Clay	34 min
May 7, 1:38 AM CDT	Special Weather Statement	MEG	Cross	52 min
May 7, 2:40 AM CDT	Flash Flood Warning	MEG	Mississippi	3 hr
May 7, 4:57 AM CDT	Flash Flood Warning	MEG	Clay, Craighead, Greene, Randolph	3 hr
May 7, 5:39 AM CDT	Flash Flood Warning	MEG	Mississippi	3 hr
May 7, 8:05 AM CDT	Flash Flood Warning	MEG	Clay, Craighead, Greene, Randolph	115 min

Nearby

Flash Flood Warnings in Arkansas, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.