Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 94

January 21, 201715 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 21, 2017, 4:03 PM EST for 15 counties in Florida. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jan 21, 2017, 4:03 PM EST (21:03 UTC)
Expired: Jan 21, 2017, 5:00 PM EST
In force: 57 min
Issued by: the Storm Prediction Center

Counties Baker County, FL, Columbia County, FL, Franklin County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 58 km from the middle of the area, began a volume at 21:06 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.1 hours before the alert went out and 57 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: 352 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

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 21, 4:00 AM EST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa, Walton	90 min
Jan 21, 4:56 AM EST	Tornado Watch	SPC	Escambia, Holmes, Okaloosa, Santa Rosa, Walton	8 hr
Jan 21, 8:41 AM EST	Mesoscale Discussion	SPC	Escambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more	94 min
Jan 21, 9:04 AM EST	Tornado Watch	SPC	Bay, Calhoun, Gadsden, Gulf, Jackson, Liberty and 1 more	6 hr
Jan 21, 10:19 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Holmes, Jackson, Liberty and 3 more	86 min
Jan 21, 1:06 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Hamilton, Jackson and 6 more	114 min
Jan 21, 2:12 PM EST	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 3 more	5 hr
Jan 21, 6:05 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gulf, Jefferson, Leon and 4 more	55 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.