Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 130

January 23, 2017Pinellas County, Sarasota County, Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 23, 2017, 4:56 AM EST for Pinellas County, Sarasota County, Florida. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jan 23, 2017, 4:56 AM EST (09:56 UTC)
Expired: Jan 23, 2017, 6:30 AM EST
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Pinellas County, FL, Sarasota County, FL

The radar

The Tampa radar (KTBW), 35 km from the middle of the area, began a volume at 09:56 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 nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 9.9 hours before the alert went out and 35 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1747 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 673 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 439 m²/s²
0-3 km storm-relative helicity: 500 m²/s²
Significant tornado parameter: 5.8
Supercell composite: 22.7

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.

Issued	Product	Office	Counties	Lasted
Jan 22, 7:32 PM EST	Mesoscale Discussion	SPC	Brevard, DeSoto, Flagler, Hardee, Hernando, Highlands and 14 more	88 min
Jan 22, 8:21 PM EST	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 19 more	114 min
Jan 22, 9:57 PM EST	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 15 more	8 hr
Jan 23, 12:18 AM EST	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Indian River, Martin and 5 more	117 min
Jan 23, 2:22 AM EST	Mesoscale Discussion	SPC	Broward, Miami-Dade, Monroe	83 min

Nearby

Mesoscale Discussions in Florida, 2017 Every 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.