Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 109

January 22, 201710 counties in Florida; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2017, 9:11 AM EST for 10 counties in Florida; 13 counties in Georgia. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jan 22, 2017, 9:11 AM EST (14:11 UTC)
Expired
Jan 22, 2017, 10:15 AM EST
In force
64 min
Issued by
the Storm Prediction Center
All 23 counties

Baker County, FL, Columbia County, FL, Duval County, FL, Gadsden County, FL, Hamilton County, FL, Jefferson County, FL, Leon County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Decatur County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Lanier County, GA, Lowndes County, GA, Thomas County, GA, Ware County, GA

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, 2.2 hours before the alert went out and 111 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 2017-01-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1298 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 2017-01-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 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
1298 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
635 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
441 m²/s²
Significant tornado parameter
2.9
Supercell composite
15.6

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
Jan 21, 7:51 PM ESTTornado Watch PDSSPCEscambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more8 hr
Jan 21, 9:30 PM ESTMesoscale DiscussionSPCHolmes, Jackson, Santa Rosa90 min
Jan 21, 10:57 PM ESTMesoscale DiscussionSPCHolmes, Jackson, Washington93 min
Jan 22, 12:49 AM ESTMesoscale DiscussionSPCHolmes, Jackson, Santa Rosa116 min
Jan 22, 2:55 AM ESTMesoscale DiscussionSPCCalhoun, Gadsden, Hamilton, Jackson, Jefferson, Leon and 1 more65 min
Jan 22, 3:20 AM ESTTornado WatchSPCBaker, Columbia, Gadsden, Hamilton, Jackson, Jefferson and 4 more9 hr
Jan 22, 6:34 AM ESTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 24 more86 min
Jan 22, 7:11 AM ESTMesoscale DiscussionSPCBaker, Calhoun, Gadsden, Hamilton, Jackson, Jefferson and 4 more2 hr
Jan 22, 8:43 AM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more2 hr
Jan 22, 9:06 AM ESTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more5 hr
Jan 22, 10:16 AM ESTMesoscale DiscussionSPCCalhoun, Escambia, Gadsden, Holmes, Jackson, Jefferson and 7 more59 min
Jan 22, 11:25 AM ESTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 20 more95 min
Jan 22, 12:02 PM ESTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 4 more58 min
Jan 22, 12:47 PM ESTTornado Watch PDSSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 27 more7 hr
Jan 22, 1:36 PM ESTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 5 more54 min
Jan 22, 1:56 PM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more94 min
Jan 22, 3:02 PM ESTMesoscale DiscussionSPCGadsden, Jefferson, Lafayette, Leon, Madison, Taylor and 1 more58 min
Jan 22, 4:12 PM ESTMesoscale DiscussionSPCDeSoto, Hardee, Highlands, Hillsborough, Lake, Manatee and 6 more63 min
Jan 22, 4:19 PM ESTMesoscale DiscussionSPCAlachua, Baker, Columbia, Dixie, Gilchrist, Hamilton and 5 more86 min
Jan 22, 4:35 PM ESTTornado Watch PDSSPCBrevard, Citrus, DeSoto, Hardee, Hernando, Highlands and 12 more5 hr
Jan 22, 12:06 AM ESTMesoscale DiscussionSPCAppling, Bacon, Ben Hill, Bibb, Bleckley, Brantley and 34 more54 min
Jan 22, 3:46 AM ESTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Butts, Carroll, Chattahoochee and 38 more119 min
Jan 22, 10:41 AM ESTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Butts, Crawford, Dodge and 27 more94 min
Jan 22, 1:31 PM ESTMesoscale DiscussionSPCChattahoochee, Harris, Meriwether, Muscogee, Troup59 min
Jan 22, 3:28 PM ESTMesoscale DiscussionSPCCarroll, Chattahoochee, Clayton, Coweta, Douglas, Fayette and 10 more92 min
Jan 22, 4:02 PM ESTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 8 more88 min
Jan 22, 4:25 PM ESTTornado Watch PDSSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 10 more3 hr
Jan 22, 6:58 PM ESTMesoscale DiscussionSPCBrantley, Bryan, Bulloch, Burke, Candler, Chatham and 11 more92 min

Nearby

Mesoscale Discussions in Georgia, 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.