Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 120

January 22, 201712 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2017, 4:12 PM EST for 12 counties in Florida. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Jan 22, 2017, 4:12 PM EST (21:12 UTC)
Expired
Jan 22, 2017, 5:15 PM EST
In force
63 min
Issued by
the Storm Prediction Center
Chance of a watch
95%

Counties DeSoto County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL

The radar

The Tampa radar (KTBW), 68 km from the middle of the area, began a volume at 21:15 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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.2 hours before the alert went out and 68 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, Tampa Bay, FL at 12:00Z on 2017-01-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 906 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, Tampa Bay, FL at 12:00Z on 2017-01-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 258 square meters per square second.1939587897Sfc1 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
906 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
258 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
1.2
Supercell composite
5.7

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, 9:11 AM ESTMesoscale DiscussionSPCBaker, Columbia, Duval, Gadsden, Hamilton, Jefferson and 4 more64 min
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, 4:19 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

Nearby

Mesoscale 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.