Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 90, NWS Jackson, MS

July 21, 2012Holmes County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 21, 2012, 7:07 AM CDT for Holmes County, Mississippi. 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: Jul 21, 2012, 7:07 AM CDT (12:07 UTC)
Expired: Jul 21, 2012, 10:19 AM CDT
In force: 3 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

County Holmes County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 93 km from the middle of the area, began a volume at 12:08 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

Jackson, MS (KJAN), launched 12:00Z, 0.1 hours before the alert went out and 88 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.

577 
WGUS54 KJAN 211207
FFWJAN
MSC051-211400-
/O.NEW.KJAN.FF.W.0090.120721T1207Z-120721T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL HOLMES COUNTY IN CENTRAL MISSISSIPPI...

* UNTIL 900 AM CDT

* AT 707 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR LEXINGTON...OR 13
  MILES EAST OF THORNTON. THE STORMS WERE NEARLY STATIONARY.
  ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF THREE TO FIVE   
  INCHES...HAVE OCCURRED IN THE PAST THREE HOURS OVER MUCH OF THE    
  WARNED AREA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HOWARD AND TCHULA

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

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 3321 9026 3322 9009 3309 8995 3296 9001
      3298 9022

$$

BYB

2 follow-up statements

698 
WGUS54 KJAN 211338
FFWJAN
MSC051-211600-
/O.EXT.KJAN.FF.W.0090.000000T0000Z-120721T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN JACKSON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  CENTRAL HOLMES COUNTY IN CENTRAL MISSISSIPPI...

* UNTIL 1100 AM CDT

* AT 836 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING     
  FROM 5 MILES EAST OF TCHULA SOUTH TO VAUGHAN. INDIVIDUAL STORMS    
  WITHIN THE LINE WERE MOVING SLOWLY SOUTH...BUT TRAINING OVER THE   
  SAME AREAS. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF     
  THREE TO FIVE INCHES...HAVE OCCURRED IN THE PAST THREE             
  HOURS...WITH THE HEAVIEST RAINFALL HAVING OCCURRED ABOUT 5 MILES   
  SOUTHWEST OF LEXINGTON.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HOWARD AND TCHULA

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

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 3321 9026 3322 9009 3309 8995 3296 9001
      3298 9022

$$

BYB

656 
WGUS74 KJAN 211519
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1019 AM CDT SAT JUL 21 2012

MSC051-211530-
/O.CAN.KJAN.FF.W.0090.000000T0000Z-120721T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HOLMES MS-
1019 AM CDT SAT JUL 21 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL HOLMES
COUNTY...

LAT...LON 3321 9026 3322 9009 3309 8995 3296 9001
      3298 9022

$$

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, 8:28 AM CDT	Flash Flood Warning	JAN	Rankin	2 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.