Alert archive / Alabama / Tornado Watches in 2016

Tornado Watch 67

March 31, 20168 counties in Alabama; Escambia County, Santa Rosa County, Florida; 4 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Mar 31, 2016, 8:43 AM CDT for 8 counties in Alabama; Escambia County, Santa Rosa County, Florida; 4 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Mar 31, 2016, 8:43 AM CDT (13:43 UTC)
Expired
Mar 31, 2016, 2:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt

Counties Baldwin County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 83 km from the middle of the area, began a volume at 13:47 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 31, 9:08 AM CDTSevere Thunderstorm WarningMOBMobile, Washington67 min
Mar 31, 10:06 AM CDTSevere Thunderstorm WarningMOBBaldwin, Clarke, Escambia, Mobile, Monroe, Washington54 min
Mar 31, 10:58 AM CDTSevere Thunderstorm WarningMOBBaldwin, Clarke, Conecuh, Escambia, Monroe62 min
Mar 31, 11:57 AM CDTSevere Thunderstorm WarningMOBConecuh, Covington, Escambia63 min
Mar 31, 12:59 PM CDTSevere Thunderstorm WarningMOBConecuh, Covington, Escambia61 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.7 hours before the alert went out and 202 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, Slidell Radar S, LA at 12:00Z on 2016-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 596 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2016-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 466 square meters per square second.1939587897Sfc1 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
596 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
466 m²/s²
0-3 km storm-relative helicity
554 m²/s²
Significant tornado parameter
1.5
Supercell composite
8.6

Open this sounding in Storm Lab

The text

As transmitted.

993 
WWUS20 KWNS 311341
SEL7  
SPC WW 311341
ALZ000-FLZ000-MSZ000-CWZ000-311900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 67
NWS STORM PREDICTION CENTER NORMAN OK
845 AM CDT THU MAR 31 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHWEST ALABAMA
  THE WESTERN FLORIDA PANHANDLE
  EXTREME SOUTHEAST MISSISSIPPI
  COASTAL WATERS

* EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 845 AM UNTIL
  200 PM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...CLUSTER OF STORMS IN SOUTHEAST MISSISSIPPI WILL LIKELY
PERSIST FOR SEVERAL MORE HOURS WHILE MOVING EASTWARD INTO SOUTHWEST
ALABAMA.  THE STORM ENVIRONMENT WILL SUPPORT THE POSSIBILITY OF A
COUPLE OF TORNADOES...AS WELL AS ISOLATED DAMAGING WINDS AND LARGE
HAIL.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF
EVERGREEN ALABAMA TO 10 MILES EAST SOUTHEAST OF MOBILE ALABAMA. 
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 66...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 27030.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 31, 7:47 AM CDTMesoscale DiscussionSPCWashington58 min
Mar 31, 8:37 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more53 min
Mar 31, 11:29 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 5 more2 hr
Mar 31, 1:32 PM CDTMesoscale DiscussionSPCBaldwin, Covington, Escambia, Geneva58 min
Mar 31, 4:47 PM CDTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Clarke, Colbert and 19 more58 min
Mar 31, 5:58 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Chilton, Choctaw, Clarke and 33 more7 hr
Mar 31, 6:52 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Colbert, Cullman, Dallas and 22 more53 min
Mar 30, 8:39 PM CDTMesoscale DiscussionSPCBolivar, Issaquena, Sharkey, Washington96 min
Mar 30, 10:00 PM CDTTornado WatchSPCAdams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 18 more6 hr
Mar 30, 11:30 PM CDTMesoscale DiscussionSPCAdams, Bolivar, Claiborne, Humphreys, Issaquena, Jefferson and 4 more60 min
Mar 31, 3:04 AM CDTMesoscale DiscussionSPCAmite, Clarke, Copiah, Covington, Forrest, Franklin and 19 more86 min
Mar 31, 3:20 AM CDTTornado WatchSPCAmite, Covington, Forrest, Jasper, Jefferson Davis, Jones and 10 more6 hr
Mar 31, 10:26 AM CDTMesoscale DiscussionSPCCoahoma, DeSoto, Tate, Tunica3 hr
Mar 31, 1:30 PM CDTMesoscale DiscussionSPCAdams, Attala, Bolivar, Calhoun, Carroll, Chickasaw and 30 more2 hr
Mar 31, 2:35 PM CDTTornado WatchSPCAdams, Alcorn, Attala, Benton, Bolivar, Calhoun and 60 more7 hr
Mar 31, 3:30 PM CDTMesoscale DiscussionSPCAmite, Covington, Forrest, Franklin, George, Greene and 13 more2 hr

Nearby

Tornado Watches in Alabama, 2016Tornado Watches in Mississippi, 2016Tornado Watches in Florida, 2016Every tornado watch in 2016

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.