Alert archive / Alabama / Tornado Warnings in 2017

Tornado Warning 9, NWS Mobile, AL

January 21, 2017Choctaw County, Alabama

NWS Mobile, AL issued this tornado warning at Jan 21, 2017, 4:52 AM CST for Choctaw County, Alabama. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jan 21, 2017, 4:52 AM CST (10:52 UTC)
Expired: Jan 21, 2017, 5:30 AM CST
In force: 38 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Choctaw County, AL

The radar

The Birmingham radar (KBMX), 164 km from the middle of the area, began a volume at 10:53 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 21, 3:56 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 10.9 hours before the alert went out and 164 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

919 
WFUS54 KMOB 211052
TORMOB
ALC023-211130-
/O.NEW.KMOB.TO.W.0009.170121T1052Z-170121T1130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mobile AL
452 AM CST SAT JAN 21 2017

The National Weather Service in Mobile has issued a

* Tornado Warning for...
  Northern Choctaw County in southwestern Alabama...

* Until 530 AM CST
    
* At 451 AM CST, a severe thunderstorm capable of producing a tornado
  was located over Crandall, or 13 miles east of Quitman, moving
  northeast at 45 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Butler and Lisman around 515 AM CST. 
  Pennington around 530 AM CST. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3231 8793 3228 8793 3228 8794 3230 8794
      3230 8798 3228 8802 3226 8801 3215 8802
      3214 8804 3211 8805 3209 8804 3206 8807
      3207 8810 3206 8812 3202 8812 3187 8847
      3211 8844 3231 8809
TIME...MOT...LOC 1051Z 239DEG 41KT 3198 8850 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

2 follow-up statements

745 
WWUS54 KMOB 211109
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
509 AM CST SAT JAN 21 2017

ALC023-211130-
/O.CON.KMOB.TO.W.0009.000000T0000Z-170121T1130Z/
Choctaw AL-
509 AM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 AM CST FOR NORTHERN
CHOCTAW COUNTY...
    
At 509 AM CST, a severe thunderstorm capable of producing a tornado
was located near Butler, moving northeast at 45 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Pennington around 530 AM CST. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3231 8793 3228 8793 3228 8794 3230 8794
      3230 8798 3228 8802 3226 8801 3215 8802
      3214 8804 3211 8805 3209 8804 3206 8807
      3207 8810 3206 8812 3202 8812 3194 8832
      3215 8837 3231 8809
TIME...MOT...LOC 1109Z 239DEG 41KT 3209 8829 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

141 
WWUS54 KMOB 211121
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
521 AM CST SAT JAN 21 2017

ALC023-211130-
/O.EXP.KMOB.TO.W.0009.000000T0000Z-170121T1130Z/
Choctaw AL-
521 AM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR NORTHERN CHOCTAW COUNTY WILL EXPIRE AT 530
AM CST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

However, a tornado warning remains in effect until 545 am for
central Choctaw county for another tornadic storm.

A tornado watch remains in effect until 1100 AM CST for southwestern
Alabama.

LAT...LON 3231 8793 3228 8793 3228 8794 3230 8794
      3230 8798 3228 8802 3226 8801 3215 8802
      3214 8804 3211 8805 3209 8804 3206 8807
      3207 8810 3206 8812 3202 8812 3194 8832
      3215 8837 3231 8809
TIME...MOT...LOC 1120Z 239DEG 41KT 3214 8818 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 20, 8:47 PM CST	River Flood Warning	MOB	Escambia	25 hr
Jan 20, 8:48 PM CST	River Flood Warning	MOB	Covington, Escambia	3 days
Jan 20, 10:18 PM CST	Rip Current Statement	MOB	Baldwin, Mobile	56 hr
Jan 21, 1:56 AM CST	Special Weather Statement	MOB	Clarke	34 min
Jan 21, 2:16 AM CST	Special Weather Statement	MOB	Clarke	44 min
Jan 21, 2:31 AM CST	Severe Thunderstorm Warning	MOB	Clarke, Monroe, Wilcox	44 min
Jan 21, 3:12 AM CST	Special Weather Statement	MOB	Wilcox	48 min
Jan 21, 3:37 AM CST	Special Weather Statement	MOB	Choctaw	38 min
Jan 21, 4:24 AM CST	Tornado Warning	MOB	Choctaw, Washington	51 min
Jan 21, 5:06 AM CST	Tornado Warning Considerable damage threat	MOB	Choctaw, Clarke	39 min
Jan 21, 5:45 AM CST	Severe Thunderstorm Warning	MOB	Clarke, Wilcox	34 min
Jan 21, 7:02 AM CST	Tornado Warning	MOB	Mobile	22 min
Jan 21, 7:07 AM CST	Special Weather Statement	MOB	Conecuh	38 min
Jan 21, 7:22 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	38 min
Jan 21, 7:28 AM CST	Wind Advisory	MOB	Baldwin, Mobile	4 hr
Jan 21, 7:32 AM CST	Special Marine Warning	MOB		58 min
Jan 21, 7:36 AM CST	Special Weather Statement	MOB	Conecuh, Escambia, Monroe	54 min
Jan 21, 8:18 AM CST	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	42 min
Jan 21, 8:27 AM CST	Special Marine Warning	MOB		63 min
Jan 21, 9:14 AM CST	Special Weather Statement	MOB	Covington	91 min
Jan 21, 9:21 AM CST	Severe Thunderstorm Warning	MOB	Covington	39 min
Jan 21, 9:28 AM CST	Special Marine Warning	MOB		92 min
Jan 21, 10:57 AM CST	Special Marine Warning	MOB		48 min
Jan 21, 3:50 PM CST	Gale Warning	MOB		41 hr

Nearby

Tornado Warnings in Alabama, 2017 Every tornado warning in 2017 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.