Alert archive / Alabama / Flash Flood Warnings in 2015

Flash Flood Warning 4, NWS Mobile, AL

April 16, 2015Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 16, 2015, 10:20 PM CDT for Choctaw County, Alabama. It was in force for 6 hr. 2 reports 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: Apr 16, 2015, 10:20 PM CDT (03:20 UTC)
Expired: Apr 17, 2015, 4:15 AM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 136 km from the middle of the area, began a volume at 03:24 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
Apr 17, 1:00 AM CDT	FLASH FLOOD	Gilbertown, AL	SEVERAL BUSINESSES INUNDATED WITH 1 TO 2 FEET OF WATER.
Apr 17, 2:32 AM CDT	FLASH FLOOD	1 S Gilbertown, AL	SEVERAL ROADS AND BUSINESSES CLOSED IN AND AROUND GILBERTOWN

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 00:00Z, 3.3 hours before the alert went out and 174 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: 3 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1412 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

240 
WGUS54 KMOB 170320
FFWMOB
ALC023-170915-
/O.NEW.KMOB.FF.W.0004.150417T0320Z-150417T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1020 PM CDT THU APR 16 2015

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CHOCTAW COUNTY IN SOUTHWESTERN ALABAMA...

* UNTIL 415 AM CDT

* AT 1019 PM CDT...VERY HEAVY RAINFALL WAS INDICATED OVER THE WARNED 
  AREA AND RADAR ESTIMATES SHOW 2 TO 4 INCHES OF RAINFALL HAS 
  OCCURRED OVER THE PAST HOUR.  THIS WILL LIKELY CAUSE FLASH 
  FLOODING IN THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...
  GILBERTOWN...          TOXEY...               HODGEWOOD...
  SOUWILPA...            JACKSON SPUR...        OLD SAMUEL...
  CHAPPELL HILL...       BARRYTOWN...           

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

NEVER TRY TO CROSS OR PLAY IN AN URBAN SPILLWAY OR FLOWING CREEK...
EVEN A SMALL ONE. URBAN FLASH FLOODING IS A MAJOR KILLER.

&&

LAT...LON 3196 8829 3181 8820 3182 8837 3195 8837

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 4:25 AM CDT	Flash Flood Warning	MOB	Choctaw	2 hr
Apr 17, 6:52 AM CDT	Areal Flood Warning	MOB	Choctaw	3 hr
Apr 17, 9:04 AM CDT	Areal Flood Warning	MOB	Choctaw, Clarke	6 hr
Apr 17, 10:22 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	10 days
Apr 17, 10:22 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	10 days
Apr 17, 11:31 AM CDT	Rip Current Statement	MOB		55 hr
Apr 17, 12:12 PM CDT	Small Craft Advisory	MOB		4 hr
Apr 17, 1:15 PM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Apr 17, 6:48 PM CDT	Special Weather Statement	MOB	Washington	42 min

Nearby

Flash Flood Warnings in Alabama, 2015 Every flash flood warning in 2015

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.