Alert archive / Mississippi / Flash Flood Warnings in 2009

Flash Flood Warning 22, NWS Mobile, AL

May 4, 2009Perry County, Mississippi

NWS Mobile, AL issued this flash flood warning at May 4, 2009, 5:28 AM CDT for Perry County, Mississippi. It was in force for 2 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 4, 2009, 5:28 AM CDT (10:28 UTC)
Expired: May 4, 2009, 7:30 AM CDT
In force: 2 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Perry County, MS

The radar

The Mobile radar (KMOB), 94 km from the middle of the area, began a volume at 10:32 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.5 hours before the alert went out and 128 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: 332 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 041028
FFWMOB
MSC111-041230-
/O.NEW.KMOB.FF.W.0022.090504T1028Z-090504T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
528 AM CDT MON MAY 4 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL PERRY COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF NEW AUGUSTA...

* UNTIL 730 AM CDT

* AT 526 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO 
 INDICATE FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HINTONVILLE

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN
THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 3130 8907 3130 8886 3112 8886 3112 8907

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 1:29 AM CDT	Severe Thunderstorm Warning	MOB	Perry	61 min
May 4, 2:09 AM CDT	Severe Thunderstorm Warning	MOB	Greene, Perry	51 min
May 4, 3:00 AM CDT	Severe Thunderstorm Warning	MOB	Greene	45 min
May 4, 3:10 AM CDT	Flash Flood Warning	MOB	Perry	95 min
May 4, 3:57 AM CDT	Flash Flood Warning	MOB	Greene	2 hr
May 4, 4:09 AM CDT	Severe Thunderstorm Warning	MOB	Greene	51 min
May 4, 5:04 AM CDT	Flash Flood Watch	MOB	Greene, Perry, Wayne	7 hr
May 4, 6:34 AM CDT	Severe Thunderstorm Warning	MOB	Greene	41 min
May 4, 6:55 AM CDT	Flash Flood Warning	MOB	Greene, Perry	3 hr
May 4, 7:24 AM CDT	Severe Thunderstorm Warning	MOB	Stone	66 min
May 4, 8:39 AM CDT	River Flood Warning	MOB	George, Greene, Wayne	45 hr
May 4, 8:43 AM CDT	Severe Thunderstorm Warning	MOB	George, Greene, Perry, Stone	62 min
May 4, 8:56 AM CDT	Flash Flood Warning	MOB	George, Greene, Perry, Stone	4 hr
May 4, 11:17 AM CDT	River Flood Warning	MOB	George, Greene, Perry	72 hr
May 4, 6:07 PM CDT	Flash Flood Warning	MOB	Greene	3 hr

Nearby

Flash Flood Warnings in Mississippi, 2009 Every flash flood warning in 2009

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.