Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 419

April 3, 20177 counties in Alabama; 4 counties in Florida; 36 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2017, 9:25 AM CDT for 7 counties in Alabama; 4 counties in Florida; 36 counties in Georgia. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2017, 9:25 AM CDT (14:25 UTC)
Expired
Apr 3, 2017, 10:30 AM CDT
In force
65 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 47 counties

Barbour County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Russell County, AL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Washington County, FL, Baker County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Coweta County, GA, Crawford County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Fayette County, GA, Harris County, GA, Heard 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, Pike 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 Ft Rucker radar (KEOX), 48 km from the middle of the area, began a volume at 14:29 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.4 hours before the alert went out and 165 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, Tallahassee Rgnl, FL at 12:00Z on 2017-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1400 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, Tallahassee Rgnl, FL at 12:00Z on 2017-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.193958Sfc1 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
1400 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
248 m²/s²
Significant tornado parameter
1.5
Supercell composite
9.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 1:48 AM CDTTornado WatchSPCBaldwin, Choctaw, Clarke, Mobile, Washington10 hr
Apr 3, 1:51 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 6 more114 min
Apr 3, 3:59 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 17 more2 hr
Apr 3, 4:25 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Chambers, Chilton and 14 more7 hr
Apr 3, 6:43 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 9 more2 hr
Apr 3, 7:06 AM CDTTornado WatchSPCButler, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more6 hr
Apr 3, 7:45 AM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Coosa, Elmore, Lee and 6 more90 min
Apr 3, 12:32 PM CDTTornado WatchSPCCalhoun, Dixie, Franklin, Gadsden, Gulf, Jefferson and 6 more6 hr
Apr 3, 2:21 PM CDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 5 more54 min
Apr 3, 5:57 PM CDTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Dixie, Duval and 17 more93 min
Apr 3, 9:07 AM CDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Bulloch and 54 more83 min
Apr 3, 9:50 AM CDTSevere Thunderstorm WatchSPCBaker, Baldwin, Barrow, Ben Hill, Berrien, Bibb and 92 more7 hr
Apr 3, 12:42 PM CDTMesoscale DiscussionSPCAppling, Bryan, Bulloch, Burke, Candler, Columbia and 24 more63 min
Apr 3, 1:07 PM CDTTornado WatchSPCAppling, Atkinson, Bacon, Baldwin, Bleckley, Bryan and 45 more6 hr
Apr 3, 5:41 PM CDTMesoscale DiscussionSPCChatham, McIntosh64 min

Nearby

Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Florida, 2017Every mesoscale discussion 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.