Alert archive / Georgia / Tornado Watches in 2021

Tornado Watch 38

March 17, 20216 counties in Alabama; 9 counties in Florida; 44 counties in Georgia

The Storm Prediction Center issued this tornado watch at Mar 17, 2021, 11:02 PM CDT for 6 counties in Alabama; 9 counties in Florida; 44 counties in Georgia. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Mar 17, 2021, 11:02 PM CDT (04:02 UTC)
Expired
Mar 18, 2021, 8:00 AM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
65 kt
All 59 counties

Coffee County, AL, Covington County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Bibb County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Houston County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Monroe County, GA, Muscogee County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Upson County, GA, Webster County, GA

The radar

The Maxwell AFB radar (KMXX), 92 km from the middle of the area, began a volume at 04:07 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 17, 11:12 PM CDTSevere Thunderstorm WarningFFCBartow, Chattooga, Floyd, Gordon, Haralson, Paulding and 1 more48 min
Mar 17, 11:23 PM CDTFlash Flood WarningFFCBartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 4 more7 hr
Mar 18, 4:29 AM CDTSevere Thunderstorm WarningTAEGeneva61 min
Mar 18, 5:04 AM CDTSevere Thunderstorm WarningTAECoffee, Dale, Henry, Houston56 min
Mar 18, 5:26 AM CDTTornado WarningTAEDale, Henry, Houston49 min
Mar 18, 5:40 AM CDTSevere Thunderstorm WarningTAEBay, Walton, Washington64 min
Mar 18, 6:01 AM CDTSevere Thunderstorm WarningTAEHenry, Houston59 min
Mar 18, 6:02 AM CDTTornado WarningTAEBay, Washington28 min
Mar 18, 6:05 AM CDTTornado WarningTAEBay, Calhoun, Gulf40 min
Mar 18, 6:15 AM CDTTornado WarningTAEHenry30 min
Mar 18, 6:19 AM CDTSevere Thunderstorm WarningTAEBay, Calhoun, Franklin, Gulf, Holmes, Jackson and 2 more86 min
Mar 18, 6:32 AM CDTTornado WarningTAEEarly43 min
Mar 18, 6:48 AM CDTTornado WarningTAEBay, Gulf27 min
Mar 18, 6:55 AM CDTSevere Thunderstorm WarningTAEBaker, Calhoun, Clay, Dougherty, Early, Quitman and 2 more65 min
Mar 18, 7:19 AM CDTSevere Thunderstorm WarningTAECalhoun, Franklin, Gadsden, Gulf, Leon, Liberty and 1 more56 min
Mar 18, 7:24 AM CDTSevere Thunderstorm WarningTAEHouston51 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.0 hours before the alert went out and 126 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, Peachtre/Fal Fld, GA at 00:00Z on 2021-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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, Peachtre/Fal Fld, GA at 00:00Z on 2021-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 404 square meters per square second.19395878Sfc1 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
11 J/kg
Mixed-layer CIN
-161 J/kg
Mixed-layer LCL
466 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
404 m²/s²
0-3 km storm-relative helicity
444 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

011 
WWUS20 KWNS 180358
SEL8  
SPC WW 180358
ALZ000-FLZ000-GAZ000-CWZ000-181100-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 38
NWS Storm Prediction Center Norman OK
1200 AM EDT Thu Mar 18 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southeast Alabama
  Florida Panhandle
  Western Georgia
  Coastal Waters

* Effective this Thursday morning from Midnight until 700 AM EDT.

* Primary threats include...
  A few tornadoes possible
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...Broken clusters of storms will steadily spread
east-northeastward across the region through the overnight hours. A
moist environment and increasingly strong low-level shear will
support the possibility of damaging winds and a few tornadoes.

The tornado watch area is approximately along and 70 statute miles
east and west of a line from 65 miles northeast of La Grange GA to
40 miles west of Panama City FL. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).

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 36...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 25040.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 17, 7:07 PM CDTTornado WatchSPCColbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 3 more3 hr
Mar 17, 9:16 PM CDTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Limestone, Madison, Marshall and 1 more89 min
Mar 17, 10:15 PM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Calhoun, Chambers, Cherokee and 18 more90 min
Mar 18, 1:52 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Covington, Dale, Geneva, Henry and 2 more83 min
Mar 18, 4:28 AM CDTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston92 min
Mar 18, 6:32 AM CDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more58 min
Mar 18, 6:53 AM CDTTornado WatchSPCDixie, Franklin, Gadsden, Gulf, Jefferson, Lafayette and 5 more5 hr
Mar 18, 10:05 AM CDTMesoscale DiscussionSPCColumbia, Dixie, Hamilton, Jefferson, Lafayette, Madison and 2 more115 min
Mar 18, 10:42 AM CDTTornado WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more6 hr
Mar 18, 9:34 AM CDTMesoscale DiscussionSPCBanks, Barrow, Clarke, Elbert, Franklin, Habersham and 5 more2 hr
Mar 18, 1:08 PM CDTTornado WatchSPCElbert, Lincoln4 hr
Mar 18, 2:10 PM CDTMesoscale DiscussionSPCElbert3 hr

Nearby

Tornado Watches in Georgia, 2021Tornado Watches in Florida, 2021Tornado Watches in Alabama, 2021Every tornado watch in 2021

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.