Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 28, NWS Mobile, AL

August 29, 2012Greene County, Perry County, Wayne County, Mississippi

NWS Mobile, AL issued this flash flood warning at Aug 29, 2012, 11:20 PM CDT for Greene County, Perry County, Wayne County, Mississippi. 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
Aug 29, 2012, 11:20 PM CDT (04:20 UTC)
Expired
Aug 30, 2012, 5:15 AM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Greene County, MS, Perry County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 99 km from the middle of the area, began a volume at 04:19 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

TimeReportWhereRemark
Aug 29, 11:57 PM CDTFLASH FLOOD5 Wsw Leakesville, MSWATER OVER HIGHWAY 57 NEAR HILLMAN. ANTICIPATE OTHER ROADS MAY BE AFFECTED.

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.3 hours before the alert went out and 153 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2012-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 408 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2012-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
408 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.3

Open this sounding in Storm Lab

The text

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

964 
WGUS54 KMOB 300420
FFWMOB
MSC041-111-153-301015-
/O.NEW.KMOB.FF.W.0028.120830T0420Z-120830T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1120 PM CDT WED AUG 29 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  NORTHERN PERRY COUNTY IN SOUTHEAST MISSISSIPPI...
  WESTERN WAYNE COUNTY IN SOUTHEAST MISSISSIPPI...

* UNTIL 515 AM CDT

* AT 1115 PM CDT...VERY HEAVY RAINFALL WAS INDICATED OVER THE WARNED
  AREA AND RADAR ESTIMATES SHOW 2 TO 3 INCHES OF RAINFALL HAS
  OCCURRED OVER THE PAST HOUR. THIS WILL LIKELY CAUSE FLASH FLOODING
  IN THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...
  CLARA...              LEAKESVILLE...        RICHTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR OCCURRING. SEEK
HIGHER GROUND IMMEDIATELY. DO NOT DRIVE OR WALK INTO AREAS WHERE
WATER CROSSES A ROAD. TURN AROUND - DON'T DROWN!

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

&&

LAT...LON 3144 8914 3144 8895 3183 8894 3182 8887
      3136 8844 3100 8843 3100 8850 3137 8915

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 29, 8:36 PM CDTFlash Flood WarningMOBGeorge, Greene, Perry, Stone6 hr
Aug 29, 9:42 PM CDTTornado WarningMOBGeorge, Greene, Perry48 min
Aug 29, 10:20 PM CDTRiver Flood WarningMOBGeorge, Greene, Perry9 days
Aug 29, 10:25 PM CDTTornado WarningMOBGreene, Perry, Wayne26 min
Aug 30, 12:52 AM CDTWind AdvisoryMOBGeorge, Greene, Perry, Stone, Wayne16 hr
Aug 30, 2:13 AM CDTRiver Flood WarningMOBPerry22 hr
Aug 30, 2:28 AM CDTAreal Flood WarningMOBGeorge, Greene, Perry, Stone12 hr
Aug 30, 4:31 AM CDTTornado WarningMOBGreene, Wayne29 min
Aug 30, 4:37 AM CDTRiver Flood WarningMOBGeorge, Greene, Wayne9 days
Aug 30, 5:22 AM CDTTornado WarningMOBWayne23 min
Aug 30, 5:48 AM CDTTornado WarningMOBGreene, Wayne27 min
Aug 30, 6:28 AM CDTTornado WarningMOBWayne30 min
Aug 30, 7:07 AM CDTFlash Flood Warning EmergencyMOBGeorge6 hr
Aug 30, 7:18 AM CDTFlash Flood WarningMOBWayne6 hr
Aug 30, 7:23 AM CDTTornado WarningMOBWayne22 min
Aug 30, 7:41 AM CDTTornado WarningMOBGeorge33 min
Aug 30, 8:10 AM CDTTornado WarningMOBWayne35 min
Aug 30, 8:13 AM CDTTornado WarningMOBGreene, Wayne32 min
Aug 30, 8:45 AM CDTTornado WarningMOBGreene, Wayne45 min
Aug 30, 9:00 AM CDTFlash Flood Warning EmergencyMOBGreene6 hr
Aug 30, 10:17 AM CDTRiver Flood WarningMOBGeorge, Greene, Jackson9 days
Aug 30, 1:18 PM CDTAreal Flood WarningMOBGeorge, Greene, Perry, Stone, Wayne20 hr

Nearby

Flash Flood Warnings in Mississippi, 2012Every 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.