Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 8, NWS Mobile, AL

April 3, 2017Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 3, 2017, 7:55 AM CDT for Mobile County, Alabama. It was in force for 4 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 3, 2017, 7:55 AM CDT (12:55 UTC)
Expired: Apr 3, 2017, 12:00 PM CDT
In force: 4 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 25 km from the middle of the area, began a volume at 12:56 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 3, 9:30 AM CDT	FLASH FLOOD	Downtown Mobile, AL	FLOWING WATER UP TO THE TIRES OF CARS ON ST. JOSEPH STREET
Apr 3, 9:55 AM CDT	HEAVY RAIN 4.5	University Of South Ala, AL	4.5 INCHES OF RAIN MESURED AT STANKY FIELD AS OF JUST BEFORE 10AM

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.9 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 555 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -464 m²/s²
0-3 km storm-relative helicity: -530 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

773 
WGUS54 KMOB 031255
FFWMOB
ALC097-031700-
/O.NEW.KMOB.FF.W.0008.170403T1255Z-170403T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
755 AM CDT MON APR 3 2017

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Mobile County in southwestern Alabama...

* Until noon CDT

* At 754 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Midtown Mobile, Downtown Mobile, Prichard, Tillmans Corner,
  Saraland, Theodore, Chickasaw, Satsuma, northeastern Grand Bay,
  Creola, Chunchula, Gulfcrest, Axis, Semmes, Tanner Williams, I65
  And I165, Mobile Regional Airport, Wilmer, I65 And AL 158 and I10
  And I65.

Additional rainfall amounts of 2 to 3 are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 3051 8840 3108 8843 3105 8794 3102 8794
      3105 8787 3079 8792 3077 8793 3090 8790
      3094 8793 3088 8798 3082 8794 3077 8802
      3078 8800 3078 8796 3073 8801 3071 8799
      3075 8793 3072 8797 3054 8801

$$

1 follow-up statement

591 
WGUS74 KMOB 031544
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1044 AM CDT MON APR 3 2017

ALC097-031553-
/O.CAN.KMOB.FF.W.0008.000000T0000Z-170403T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mobile AL-
1044 AM CDT MON APR 3 2017

...THE FLASH FLOOD WARNING FOR 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 3051 8840 3108 8843 3105 8794 3102 8794
      3105 8787 3079 8792 3077 8793 3090 8790
      3094 8793 3088 8798 3082 8794 3077 8802
      3078 8800 3078 8796 3073 8801 3071 8799
      3075 8793 3072 8797 3054 8801

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 3:29 AM CDT	Special Weather Statement	MOB	Choctaw	46 min
Apr 3, 3:41 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw	49 min
Apr 3, 5:10 AM CDT	Severe Thunderstorm Warning	MOB	Washington	50 min
Apr 3, 5:45 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	45 min
Apr 3, 5:57 AM CDT	Severe Thunderstorm Warning	MOB	Clarke, Mobile, Washington	48 min
Apr 3, 6:28 AM CDT	Severe Thunderstorm Warning	MOB	Clarke, Washington	47 min
Apr 3, 6:43 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	47 min
Apr 3, 6:53 AM CDT	Special Marine Warning	MOB		97 min
Apr 3, 7:26 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 2 more	49 min
Apr 3, 7:27 AM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
Apr 3, 7:45 AM CDT	Special Weather Statement	MOB	Baldwin, Covington, Escambia	45 min
Apr 3, 7:53 AM CDT	Flash Flood Watch	MOB	Baldwin, Conecuh, Covington, Escambia, Mobile	4 hr
Apr 3, 8:09 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Conecuh, Covington, Escambia, Mobile	51 min
Apr 3, 8:26 AM CDT	Special Marine Warning	MOB		94 min
Apr 3, 8:26 AM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia	64 min
Apr 3, 8:49 AM CDT	Special Marine Warning	MOB		56 min
Apr 3, 8:54 AM CDT	Flash Flood Warning	MOB	Baldwin	4 hr
Apr 3, 8:54 AM CDT	Tornado Warning	MOB	Crenshaw	13 min
Apr 3, 8:59 AM CDT	Special Marine Warning	MOB		61 min
Apr 3, 9:00 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia, Mobile	60 min
Apr 3, 9:33 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Apr 3, 9:33 AM CDT	Special Marine Warning	MOB		87 min
Apr 3, 9:36 AM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington	39 min
Apr 3, 9:43 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	8 days
Apr 3, 9:43 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	9 days
Apr 3, 9:43 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin	62 min
Apr 3, 10:02 AM CDT	Special Marine Warning	MOB		58 min
Apr 3, 10:46 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin	45 min
Apr 3, 10:55 AM CDT	Special Marine Warning	MOB		2 hr
Apr 3, 12:54 PM CDT	Special Marine Warning	MOB		66 min
Apr 3, 1:55 PM CDT	Special Marine Warning	MOB		2 hr
Apr 3, 3:51 PM CDT	Special Marine Warning	MOB		114 min
Apr 3, 5:38 PM CDT	Special Marine Warning	MOB		67 min

Nearby

Flash Flood Warnings in Alabama, 2017 Every flash flood warning in 2017

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.