Alert archive / Alabama / Tornado Warnings in 2017

Tornado Warning 8, NWS Huntsville, AL

April 30, 2017Lauderdale County, Limestone County, Alabama

NWS Huntsville, AL issued this tornado warning at Apr 30, 2017, 1:56 PM CDT for Lauderdale County, Limestone County, Alabama. It was in force for 19 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: Apr 30, 2017, 1:56 PM CDT (18:56 UTC)
Expired: Apr 30, 2017, 2:15 PM CDT
In force: 19 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Lauderdale County, AL, Limestone County, AL

The radar

The Northeast Alabama radar (KHTX), 95 km from the middle of the area, began a volume at 18:56 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 10:36 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.9 hours before the alert went out and 147 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: 329 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

478 
WFUS54 KHUN 301856
TORHUN
ALC077-083-301930-
/O.NEW.KHUN.TO.W.0008.170430T1856Z-170430T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Huntsville AL
156 PM CDT SUN APR 30 2017

The National Weather Service in Huntsville Alabama has issued a

* Tornado Warning for...
  East central Lauderdale County in northwestern Alabama...
  Northwestern Limestone County in north central Alabama...

* Until 230 PM CDT
    
* At 156 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Rogersville, or 14 miles west of Athens, moving
  northeast at 50 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 tornadic thunderstorm will remain over mainly rural areas of
  east central Lauderdale and northwestern Limestone Counties,
  including the following locations: Good Springs, Cartwright, Coxey,
  Oliver and Mt Rozell.

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 3500 8693 3499 8690 3475 8718 3476 8722
      3476 8727 3479 8733 3500 8720
TIME...MOT...LOC 1856Z 213DEG 44KT 3480 8722 

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

$$

Stumpf

2 follow-up statements

509 
WWUS54 KHUN 301908
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
208 PM CDT SUN APR 30 2017

ALC077-301918-
/O.CAN.KHUN.TO.W.0008.000000T0000Z-170430T1930Z/
Lauderdale AL-
208 PM CDT SUN APR 30 2017

...THE TORNADO WARNING FOR EAST CENTRAL LAUDERDALE COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 700 PM CDT for north central
and northwestern Alabama. A tornado watch also remains in effect
until 700 PM CDT for north central Alabama...and Middle Tennessee.

LAT...LON 3499 8707 3499 8694 3482 8712 3485 8721
      3494 8721 3500 8720 3500 8708
TIME...MOT...LOC 1908Z 213DEG 44KT 3493 8712 

$$

ALC083-301930-
/O.CON.KHUN.TO.W.0008.000000T0000Z-170430T1930Z/
Limestone AL-
208 PM CDT SUN APR 30 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR
NORTHWESTERN LIMESTONE COUNTY...
    
At 208 PM CDT, a severe thunderstorm capable of producing a tornado
was located 11 miles northwest of Athens, moving northeast at 50 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. 

Locations impacted include...
Lester, Good Springs, Cartwright, Cairo, Mt Rozell and Leggtown. 

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 3499 8707 3499 8694 3482 8712 3485 8721
      3494 8721 3500 8720 3500 8708
TIME...MOT...LOC 1908Z 213DEG 44KT 3493 8712 

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

$$

Stumpf

275 
WWUS54 KHUN 301915
SVSHUN

Severe Weather Statement
National Weather Service Huntsville AL
215 PM CDT SUN APR 30 2017

ALC083-301925-
/O.CAN.KHUN.TO.W.0008.000000T0000Z-170430T1930Z/
Limestone AL-
215 PM CDT SUN APR 30 2017

...THE TORNADO WARNING FOR NORTHWESTERN LIMESTONE COUNTY IS
CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

A tornado watch remains in effect until 700 PM CDT for north central
and northwestern Alabama. A tornado watch also remains in effect
until 700 PM CDT for north central Alabama...and Middle Tennessee.

LAT...LON 3499 8707 3499 8694 3482 8712 3485 8721
      3494 8721 3500 8720 3500 8708
TIME...MOT...LOC 1913Z 213DEG 44KT 3500 8706 

$$

Stumpf

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 9:30 AM CDT	River Flood Warning	HUN	Jackson, Madison, Marshall	64 hr
Apr 30, 12:14 PM CDT	Special Weather Statement	HUN	Colbert, Franklin, Lauderdale	46 min
Apr 30, 12:51 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lauderdale	39 min
Apr 30, 12:55 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence	50 min
Apr 30, 1:25 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	35 min
Apr 30, 1:28 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	32 min
Apr 30, 1:38 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Lawrence, Limestone, Morgan	52 min
Apr 30, 1:52 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Lawrence, Limestone, Morgan	38 min
Apr 30, 2:09 PM CDT	Tornado Warning	HUN	Cullman, Morgan	21 min
Apr 30, 2:21 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Limestone, Madison, Marshall, Morgan	39 min
Apr 30, 2:54 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Madison, Marshall	66 min
Apr 30, 3:58 PM CDT	Special Weather Statement	HUN	DeKalb, Jackson	47 min

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.