Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 826

May 24, 201738 counties in Florida; Decatur County, Grady County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at May 24, 2017, 10:26 AM EDT for 38 counties in Florida; Decatur County, Grady County, Seminole County, Georgia. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
May 24, 2017, 10:26 AM EDT (14:26 UTC)
Expired
May 24, 2017, 12:00 PM EDT
In force
94 min
Issued by
the Storm Prediction Center
All 41 counties

Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Hernando County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Lake County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Orange County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Wakulla County, FL, Washington County, FL, Decatur County, GA, Grady County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 74 km from the middle of the area, began a volume at 14:31 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 74 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 2017-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 673 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 2017-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
673 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
807 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.9

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
May 24, 3:45 AM EDTMesoscale DiscussionSPCAlachua, Bradford, Clay, Duval, Gilchrist, Levy and 3 more2 hr
May 24, 6:30 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Brevard, Citrus, Clay and 33 more2 hr
May 24, 6:56 AM EDTTornado WatchSPCAlachua, Baker, Bay, Bradford, Calhoun, Citrus and 30 more8 hr
May 24, 11:03 AM EDTTornado WatchSPCBaker, Columbia, Duval, Hamilton, Nassau, Suwannee10 hr
May 24, 12:54 PM EDTMesoscale DiscussionSPCAlachua, Bradford, Brevard, Broward, Charlotte, Citrus and 30 more2 hr
May 24, 2:10 PM EDTMesoscale DiscussionSPCBaker, Columbia, Duval, Hamilton, Madison, Nassau and 1 more95 min
May 24, 2:49 PM EDTSevere Thunderstorm WatchSPCBrevard, Broward, Charlotte, Clay, Collier, DeSoto and 23 more7 hr
May 24, 5:25 PM EDTMesoscale DiscussionSPCBaker, Columbia, Duval, Hamilton, Madison, Nassau and 2 more65 min
May 23, 8:12 PM EDTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Clayton, Cobb, Coweta and 15 more93 min
May 23, 8:46 PM EDTMesoscale DiscussionSPCAppling, Bacon, Brantley, Bryan, Bulloch, Candler and 12 more89 min
May 24, 7:41 AM EDTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 8 more3 hr
May 24, 8:29 AM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 83 more3 hr
May 24, 10:04 AM EDTTornado WatchSPCBanks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 50 more11 hr
May 24, 3:02 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Carroll, Cherokee, Clarke and 43 more88 min

Nearby

Mesoscale Discussions in Florida, 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.