Alert archive / Alabama / Tornado Watches in 2017

Tornado Watch 57

March 1, 20175 states

The Storm Prediction Center issued this tornado watch at Mar 1, 2017, 11:48 AM CST for 5 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Mar 1, 2017, 11:48 AM CST (17:48 UTC)
Expired
Mar 1, 2017, 6:00 PM CST
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 90 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, St. Clair County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Itawamba County, MS, Kemper County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Tishomingo County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Cherokee County, NC, Clay County, NC, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Franklin County, TN, Hamilton County, TN, Knox County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN

The radar

The Columbus AFB radar (KGWX), 37 km from the middle of the area, began a volume at 17:51 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
60%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

50 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Mar 1, 11:58 AM CSTSevere Thunderstorm WarningHUNColbert, Lauderdale, Lawrence, Limestone32 min
Mar 1, 12:00 PM CSTSevere Thunderstorm WarningHUNFranklin, Lincoln, Moore30 min
Mar 1, 12:10 PM CSTTornado WarningHUNLauderdale, Limestone35 min
Mar 1, 12:11 PM CSTSevere Thunderstorm WarningMRXBledsoe, Rhea29 min
Mar 1, 12:23 PM CSTSevere Thunderstorm WarningMRXAnderson, Blount, Knox, Loudon, Roane52 min
Mar 1, 12:32 PM CSTSevere Thunderstorm WarningHUNColbert, Lawrence28 min
Mar 1, 12:35 PM CSTFlash Flood WarningMRXAnderson, Knox, Loudon, Roane3 hr
Mar 1, 12:36 PM CSTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe39 min
Mar 1, 12:38 PM CSTSevere Thunderstorm WarningJANClay, Webster26 min
Mar 1, 12:44 PM CSTSevere Thunderstorm WarningHUNLimestone, Madison31 min
Mar 1, 12:52 PM CSTSevere Thunderstorm WarningHUNFranklin, Moore23 min
Mar 1, 12:53 PM CSTSevere Thunderstorm WarningHUNLawrence, Limestone, Morgan37 min
Mar 1, 12:58 PM CSTSevere Thunderstorm WarningMRXBledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie62 min
Mar 1, 1:01 PM CSTSevere Thunderstorm WarningJANAttala, Holmes59 min
Mar 1, 1:06 PM CSTSevere Thunderstorm WarningBMXMarion24 min
Mar 1, 1:06 PM CSTFlash Flood WarningMRXAnderson, Grainger, Knox, Union3 hr
Mar 1, 1:10 PM CSTSevere Thunderstorm WarningHUNJackson, Madison35 min
Mar 1, 1:16 PM CSTSevere Thunderstorm WarningMEGMonroe44 min
Mar 1, 1:19 PM CSTSevere Thunderstorm WarningHUNMadison26 min
Mar 1, 1:19 PM CSTSevere Thunderstorm WarningHUNFranklin, Lawrence26 min
Mar 1, 1:30 PM CSTSevere Thunderstorm WarningMRXMarion45 min
Mar 1, 1:39 PM CSTSevere Thunderstorm WarningHUNCullman, Morgan36 min
Mar 1, 1:41 PM CSTSevere Thunderstorm WarningJANClay, Lowndes34 min
Mar 1, 1:41 PM CSTSevere Thunderstorm WarningHUNFranklin19 min
Mar 1, 1:43 PM CSTSevere Thunderstorm WarningHUNJackson32 min
Mar 1, 1:45 PM CSTSevere Thunderstorm WarningJANWinston60 min
Mar 1, 2:02 PM CSTSevere Thunderstorm WarningMRXHamilton, Marion58 min
Mar 1, 2:07 PM CSTSevere Thunderstorm WarningBMXFayette, Lamar38 min
Mar 1, 2:10 PM CSTSevere Thunderstorm WarningHUNMarshall, Morgan35 min
Mar 1, 2:15 PM CSTSevere Thunderstorm WarningBMXWalker, Winston45 min
Mar 1, 2:19 PM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson26 min
Mar 1, 2:20 PM CSTSevere Thunderstorm WarningMRXBlount, Knox, Sevier30 min
Mar 1, 2:28 PM CSTSevere Thunderstorm WarningJANNoxubee22 min
Mar 1, 2:35 PM CSTSevere Thunderstorm WarningMRXBradley, Hamilton, McMinn, Meigs, Monroe, Polk55 min
Mar 1, 2:37 PM CSTSevere Thunderstorm WarningBMXFayette, Walker53 min
Mar 1, 2:39 PM CSTSevere Thunderstorm WarningFFCCatoosa, Dade, Walker, Whitfield38 min
Mar 1, 2:40 PM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson, Marshall50 min
Mar 1, 2:54 PM CSTSevere Thunderstorm WarningHUNCullman, Marshall36 min
Mar 1, 2:55 PM CSTSevere Thunderstorm WarningBMXBlount23 min
Mar 1, 3:05 PM CSTSevere Thunderstorm WarningHUNCullman25 min
Mar 1, 3:10 PM CSTSevere Thunderstorm WarningMRXBlount, Monroe18 min
Mar 1, 3:19 PM CSTSevere Thunderstorm WarningFFCBartow, Chattooga, Floyd, Gordon, Murray41 min
Mar 1, 3:27 PM CSTSevere Thunderstorm WarningMRXCherokee18 min
Mar 1, 3:28 PM CSTSevere Thunderstorm WarningBMXJefferson47 min
Mar 1, 3:46 PM CSTFlash Flood WarningMRXBlount, Jefferson, Knox, Loudon, Sevier3 hr
Mar 1, 3:55 PM CSTSevere Thunderstorm WarningBMXGreene, Sumter34 min
Mar 1, 3:55 PM CSTSevere Thunderstorm WarningFFCBartow, Cherokee, Gordon, Pickens50 min
Mar 1, 3:58 PM CSTSevere Thunderstorm WarningFFCFannin, Gilmer, Lumpkin, Towns, Union, White47 min
Mar 1, 4:18 PM CSTSevere Thunderstorm WarningBMXCalhoun, St. Clair57 min
Mar 1, 4:47 PM CSTSevere Thunderstorm WarningFFCDawson, Hall, Lumpkin, White43 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 5.8 hours before the alert went out and 145 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2017-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 246 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2017-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 290 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
246 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
549 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
290 m²/s²
0-3 km storm-relative helicity
372 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

140 
WWUS20 KWNS 011746
SEL7  
SPC WW 011746
ALZ000-GAZ000-MSZ000-NCZ000-TNZ000-020000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 57
NWS Storm Prediction Center Norman OK
1150 AM CST Wed Mar 1 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern and Central Alabama
  Northern Georgia
  Central and Northeast Mississippi
  Extreme Western North Carolina
  Southeast Tennessee

* Effective this Wednesday morning and evening from 1150 AM until
  600 PM CST.

* Primary threats include...
  A few tornadoes likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...Thunderstorms will slowly intensify this afternoon along a
boundary extending from northern MS into southeast TN, and spread
across the watch area.  Large hail and isolated tornadoes are the
main threats with these storms.

The tornado watch area is approximately along and 60 statute miles
north and south of a line from 40 miles southwest of Greenwood MS to
65 miles east of Chattanooga TN. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 55...WW 56...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 25035.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 1, 4:19 AM CSTMesoscale DiscussionSPCLauderdale56 min
Mar 1, 5:28 AM CSTMesoscale DiscussionSPCLauderdale2 hr
Mar 1, 10:08 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 19 more2 hr
Mar 1, 2:11 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 7 more2 hr
Mar 1, 2:43 PM CSTMesoscale DiscussionSPCAutauga, Chambers, Chilton, Clay, Coosa, Elmore and 3 more3 hr
Mar 1, 3:43 PM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Chambers, Chilton, Clay, Cleburne and 10 more4 hr
Mar 1, 5:54 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Choctaw, Clarke and 16 more2 hr
Mar 1, 1:07 PM CSTMesoscale DiscussionSPCRabun113 min
Mar 1, 2:02 PM CSTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens7 hr
Mar 1, 2:09 AM CSTMesoscale DiscussionSPCDeSoto, Tunica2 hr
Mar 1, 1:32 PM CSTMesoscale DiscussionSPCAdams, Amite, Clarke, Copiah, Covington, Franklin and 14 more2 hr
Mar 1, 8:44 AM CSTMesoscale DiscussionSPCAlamance, Alleghany, Ashe, Caswell, Forsyth, Granville and 8 more91 min
Mar 1, 9:38 AM CSTSevere Thunderstorm WatchSPCAlleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more4 hr
Mar 1, 11:25 AM CSTMesoscale DiscussionSPCAlleghany, Rockingham, Stokes, Surry65 min
Mar 1, 11:50 AM CSTMesoscale DiscussionSPCGates, Granville, Halifax, Hertford, Northampton, Vance and 1 more55 min
Mar 1, 5:21 PM CSTMesoscale DiscussionSPCAlamance, Anson, Beaufort, Bertie, Bladen, Cabarrus and 40 more114 min
Feb 28, 7:46 PM CSTMesoscale DiscussionSPCCrockett, Dyer, Gibson, Henry, Lake, Lauderdale and 3 more119 min
Feb 28, 8:29 PM CSTTornado WatchSPCCarroll, Crockett, Dyer, Gibson, Haywood, Henry and 6 more12 hr
Mar 1, 3:03 AM CSTTornado WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more5 hr
Mar 1, 4:57 AM CSTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 32 more5 hr
Mar 1, 6:47 AM CSTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Blount, Campbell, Carter, Claiborne and 23 more5 hr
Mar 1, 7:28 AM CSTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Campbell, Cannon, Claiborne and 37 more92 min

Nearby

Tornado Watches in Alabama, 2017Tornado Watches in Mississippi, 2017Tornado Watches in Georgia, 2017Every tornado watch 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.