Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 113, NWS Huntsville, AL

June 23, 2017Limestone County, Madison County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 23, 2017, 2:15 PM CDT for Limestone County, Madison County, Alabama. It was in force for 30 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: Jun 23, 2017, 2:15 PM CDT (19:15 UTC)
Expired: Jun 23, 2017, 2:45 PM CDT
In force: 30 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Limestone County, AL, Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 83 km from the middle of the area, began a volume at 19:16 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
Jun 23, 12:16 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.3 hours before the alert went out and 156 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: 449 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 660 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

978 
WUUS54 KHUN 231915
SVRHUN
ALC083-089-231945-
/O.NEW.KHUN.SV.W.0113.170623T1915Z-170623T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
215 PM CDT FRI JUN 23 2017

The National Weather Service in Huntsville Alabama has issued a

* Severe Thunderstorm Warning for...
  Northwestern Madison County in north central Alabama...
  Southeastern Limestone County in north central Alabama...

* Until 245 PM CDT

* At 215 PM CDT, a severe thunderstorm was located near Tanner, or
  near Athens, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Northern Huntsville, Athens, Ardmore, Harvest, Tanner, French Mill,
  Ripley, Toney and Capshaw.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

A tornado watch remains in effect until 800 PM CDT for north central,
northeastern and northwestern Alabama...and Middle Tennessee.

LAT...LON 3483 8665 3464 8701 3465 8703 3465 8705
      3467 8709 3470 8713 3472 8713 3474 8717
      3475 8718 3499 8684 3499 8676
TIME...MOT...LOC 1915Z 232DEG 42KT 3473 8706 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

70/DD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 12:24 AM CDT	Special Weather Statement	HUN	Marshall	36 min
Jun 23, 11:51 AM CDT	Special Weather Statement	HUN	Franklin	24 min
Jun 23, 11:54 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin	36 min
Jun 23, 12:26 PM CDT	Special Weather Statement	HUN	Colbert, Lauderdale	34 min
Jun 23, 12:30 PM CDT	Special Weather Statement	HUN	Franklin	30 min
Jun 23, 1:01 PM CDT	Special Weather Statement	HUN	Colbert, Franklin, Lauderdale	29 min
Jun 23, 1:13 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence	32 min
Jun 23, 1:15 PM CDT	Flash Flood Warning	HUN	Colbert, Lauderdale, Lawrence	6 hr
Jun 23, 1:21 PM CDT	Tornado Warning	HUN	Franklin, Lawrence	24 min
Jun 23, 1:40 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	35 min
Jun 23, 1:47 PM CDT	Tornado Warning	HUN	Lawrence	28 min
Jun 23, 1:56 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Lawrence, Morgan	34 min
Jun 23, 2:08 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	19 min
Jun 23, 2:44 PM CDT	Severe Thunderstorm Warning	HUN	Madison	31 min
Jun 23, 2:47 PM CDT	Flash Flood Warning	HUN	Colbert, Franklin, Lawrence, Limestone, Morgan	6 hr
Jun 23, 3:13 PM CDT	Special Weather Statement	HUN	Cullman	32 min
Jun 23, 3:28 PM CDT	Special Weather Statement	HUN	Marshall	32 min
Jun 23, 3:48 PM CDT	Areal Flood Warning	HUN	Madison	6 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.