Alert archive / Alabama / Flash Flood Warnings in 2016

Flash Flood Warning 38, NWS Mobile, AL

September 16, 2016Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 16, 2016, 11:48 AM CDT for Mobile County, Alabama. 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: Sep 16, 2016, 11:48 AM CDT (16:48 UTC)
Expired: Sep 16, 2016, 2:45 PM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 23 km from the middle of the area, began a volume at 16:50 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 12:00Z, 4.8 hours before the alert went out and 146 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: 1433 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -65 m²/s²
0-3 km storm-relative helicity: -42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

179 
WGUS54 KMOB 161648
FFWMOB
ALC097-161945-
/O.NEW.KMOB.FF.W.0038.160916T1648Z-160916T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1148 AM CDT FRI SEP 16 2016

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH MOBILE COUNTY IN SOUTHWESTERN ALABAMA...

* UNTIL 245 PM CDT

* AT 1146 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED.
  
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  THEODORE...GRAND BAY...BAYOU LA BATRE...ALABAMA PORT AND CODEN. 

LAT...LON 3056 8808 3035 8808 3034 8836 3056 8840

$$

1 follow-up statement

842 
WGUS74 KMOB 161831
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
131 PM CDT FRI SEP 16 2016

ALC097-161840-
/O.CAN.KMOB.FF.W.0038.000000T0000Z-160916T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOBILE AL-
131 PM CDT FRI SEP 16 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MOBILE COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3056 8808 3035 8808 3034 8836 3056 8840

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 10:56 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Sep 16, 11:04 AM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Sep 16, 11:26 AM CDT	Flash Flood Warning	MOB	Baldwin	3 hr

Nearby

Flash Flood Warnings in Alabama, 2016 Every flash flood warning in 2016

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.