Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 113

January 22, 2017Geneva County, Houston County, Alabama; 10 counties in Florida; Decatur County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2017, 11:02 AM CST for Geneva County, Houston County, Alabama; 10 counties in Florida; Decatur County, Seminole County, Georgia. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Jan 22, 2017, 11:02 AM CST (17:02 UTC)
Expired
Jan 22, 2017, 12:00 PM CST
In force
58 min
Issued by
the Storm Prediction Center

Counties Geneva County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Seminole County, GA

The radar

The Eglin Afb radar (KEVX), 44 km from the middle of the area, began a volume at 17:05 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, 5.0 hours before the alert went out and 116 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.

314 
ACUS11 KWNS 221702
SWOMCD
SPC MCD 221702 
FLZ000-GAZ000-ALZ000-221800-

Mesoscale Discussion 0113
NWS Storm Prediction Center Norman OK
1102 AM CST Sun Jan 22 2017

Areas affected...portions of the FL panhandle into far southeast AL
and southwest GA

Concerning...Tornado Watch 20...

Valid 221702Z - 221800Z

The severe weather threat for Tornado Watch 20 continues.

SUMMARY...The near-term tornado and damaging wind threat is
increasing across the MCD area.

DISCUSSION...Conditions are rapidly evolving across parts of the FL
panhandle into far southeast AL/southwest GA. As rapid
intensification of the surface low over Escambia County FL/Baldwin
County AL continues, the warm front is quickly lifting northward
from near the FL/AL/GA border into southern AL/GA. To the south of
the boundary, surface observations over the last hour indicate quick
airmass recovery is occurring with temperatures warming from the mid
60s into the low 70s and dewpoints slowly rebounding. As a line of
strong to severe storms currently extending from near Covington
County AL south/southwest into the Gulf tracks east into the
recovering boundary layer, increasingly favorable deep layer shear
will be encountered. 1636Z VWP data from TLH indicates 0-1km SRH
values great than 350 m2/s2 and the tornado and damaging wind threat
will increase quickly in the short-term across the MCD area.

..Leitman.. 01/22/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...TAE...MOB...

LAT...LON   30718653 31138615 31298556 31118472 30798439 30278438
            29998446 29628479 29578529 29698590 30018637 30298657
            30718653

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 21, 6:05 PM CSTMesoscale DiscussionSPCMobile85 min
Jan 21, 6:51 PM CSTTornado Watch PDSSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more8 hr
Jan 21, 8:30 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more90 min
Jan 21, 9:57 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Chilton and 29 more93 min
Jan 21, 11:49 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Chilton and 30 more116 min
Jan 22, 1:55 AM CSTMesoscale DiscussionSPCHenry, Houston65 min
Jan 22, 2:20 AM CSTTornado WatchSPCHenry, Houston9 hr
Jan 22, 2:46 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Coosa, Crenshaw and 9 more119 min
Jan 22, 5:34 AM CSTMesoscale DiscussionSPCHouston86 min
Jan 22, 7:43 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Butler, Clarke, Coffee, Conecuh and 9 more2 hr
Jan 22, 8:06 AM CSTTornado WatchSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 8 more5 hr
Jan 22, 9:16 AM CSTMesoscale DiscussionSPCEscambia59 min
Jan 22, 11:47 AM CSTTornado Watch PDSSPCAutauga, Barbour, Bullock, Chambers, Chilton, Coffee and 13 more7 hr
Jan 22, 12:31 PM CSTMesoscale DiscussionSPCBullock, Chambers, Elmore, Lee, Macon, Montgomery and 2 more59 min
Jan 22, 2:28 PM CSTMesoscale DiscussionSPCChambers, Clay, Lee, Randolph92 min
Jan 22, 6:11 AM CSTMesoscale DiscussionSPCBaker, Calhoun, Gadsden, Hamilton, Jackson, Jefferson and 4 more2 hr
Jan 22, 8:11 AM CSTMesoscale DiscussionSPCBaker, Columbia, Duval, Gadsden, Hamilton, Jefferson and 4 more64 min
Jan 22, 10:25 AM CSTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 20 more95 min
Jan 22, 12:36 PM CSTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 5 more54 min
Jan 22, 12:56 PM CSTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more94 min
Jan 22, 2:02 PM CSTMesoscale DiscussionSPCGadsden, Jefferson, Lafayette, Leon, Madison, Taylor and 1 more58 min
Jan 22, 3:12 PM CSTMesoscale DiscussionSPCDeSoto, Hardee, Highlands, Hillsborough, Lake, Manatee and 6 more63 min
Jan 22, 3:19 PM CSTMesoscale DiscussionSPCAlachua, Baker, Columbia, Dixie, Gilchrist, Hamilton and 5 more86 min
Jan 22, 3:35 PM CSTTornado Watch PDSSPCBrevard, Citrus, DeSoto, Hardee, Hernando, Highlands and 12 more5 hr
Jan 21, 11:06 PM CSTMesoscale DiscussionSPCAppling, Bacon, Ben Hill, Bibb, Bleckley, Brantley and 34 more54 min
Jan 22, 9:41 AM CSTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Butts, Crawford, Dodge and 27 more94 min
Jan 22, 3:02 PM CSTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 8 more88 min
Jan 22, 3:25 PM CSTTornado Watch PDSSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 10 more3 hr
Jan 22, 5:58 PM CSTMesoscale DiscussionSPCBrantley, Bryan, Bulloch, Burke, Candler, Chatham and 11 more92 min

Nearby

Mesoscale Discussions in Florida, 2017Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Georgia, 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.