Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 91, NWS Jackson, MS

July 21, 2012Rankin County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 21, 2012, 8:28 AM CDT for Rankin County, Mississippi. 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: Jul 21, 2012, 8:28 AM CDT (13:28 UTC)
Expired: Jul 21, 2012, 10:30 AM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Rankin County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 7 km from the middle of the area, began a volume at 13:31 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
Jul 21, 9:43 AM CDT	FLASH FLOOD	2 Wsw Fannin, MS	REPORT VIA SOCIAL MEDIA OF WATER FLOWING ACROSS CHURCH ROAD NEAR FANNIN.

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

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 1.5 hours before the alert went out and 4 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: 710 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 1138 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.3

Open this sounding in Storm Lab

The text

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

176 
WGUS54 KJAN 211328
FFWJAN
MSC121-211530-
/O.NEW.KJAN.FF.W.0091.120721T1328Z-120721T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
828 AM CDT SAT JUL 21 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RANKIN COUNTY IN CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...STAR...RICHLAND...PEARL...FLOWOOD...
  BRANDON...

* UNTIL 1030 AM CDT

* AT 826 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  CANTON TO STAR. THE STORMS WERE NEARLY MOVING SLOWLY SOUTH...BUT   
  TENDING TO TRAIN OVER THE SAME AREAS. ESTIMATED RADAR RAINFALL     
  AMOUNTS...ON THE ORDER OF ONE TO THREE INCHES...HAVE OCCURRED IN   
  THE PAST TWO HOURS...WITH THE HEAVIEST AMOUNTS THUS FAR EXTENDING  
  FROM THE RESERVOIR SOUTH TO FANNIN. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LEESBURG...FANNIN...CATO...JOHNS...PISGAH AND PELAHATCHIE

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
TWO HOURS WITH AN ADDITIONAL ONE TO THREE INCHES POSSIBLE.

RAINFALL AMOUNTS FROM ONE TO THREE INCHES A HOUR CAN CAUSE FLOODING
ON WOODGATE DRIVE NEAR THE CROSSGATES SWIM CLUB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3205 9023 3209 9025 3210 9024 3215 9026
      3220 9019 3225 9020 3235 9011 3238 9010
      3239 9007 3243 9007 3248 9002 3249 8996
      3259 8984 3258 8978 3236 8973 3204 8973

$$

BYB

1 follow-up statement

915 
WGUS74 KJAN 211535
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1035 AM CDT SAT JUL 21 2012

MSC121-211545-
/O.EXP.KJAN.FF.W.0091.000000T0000Z-120721T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RANKIN MS-
1035 AM CDT SAT JUL 21 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR RANKIN COUNTY...

MODERATE RAIN WILL CONTINUE FOR A LITTLE WHILE LONGER IN SOUTHERN 
PORTIONS OF THE COUNTY...BUT THE RISK OF ANY FLASH FLOODING HAS 
DIMINISHED GREATLY. 

LAT...LON 3205 9023 3209 9025 3210 9024 3215 9026
      3220 9019 3225 9020 3235 9011 3238 9010
      3239 9007 3243 9007 3248 9002 3249 8996
      3259 8984 3258 8978 3236 8973 3204 8973

$$

BYB

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 7:00 PM CDT	Special Weather Statement	JAN	Simpson	30 min
Jul 20, 7:07 PM CDT	Severe Thunderstorm Warning	JAN	Claiborne	38 min
Jul 20, 7:11 PM CDT	Special Weather Statement	JAN	Simpson	29 min
Jul 21, 3:48 AM CDT	Special Weather Statement	JAN	Noxubee	32 min
Jul 21, 4:19 AM CDT	Special Weather Statement	JAN	Lowndes, Noxubee	56 min
Jul 21, 5:45 AM CDT	Special Weather Statement	JAN	Newton	45 min
Jul 21, 5:50 AM CDT	Severe Thunderstorm Warning	JAN	Newton	27 min
Jul 21, 6:38 AM CDT	Flash Flood Warning	JAN	Kemper, Lauderdale	2 hr
Jul 21, 6:56 AM CDT	Special Weather Statement	JAN	Rankin	59 min
Jul 21, 7:07 AM CDT	Flash Flood Warning	JAN	Holmes	3 hr
Jul 21, 9:25 AM CDT	Flash Flood Warning	JAN	Copiah, Franklin, Lincoln	2 hr

Nearby

Flash Flood Warnings in Mississippi, 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.