Alert archive / Florida / Mesoscale Discussions in 2023

Mesoscale Discussion 643

April 27, 2023Brevard County, Martin County, Saint Lucie County, Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2023, 7:52 PM EDT for Brevard County, Martin County, Saint Lucie County, Florida. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Apr 27, 2023, 7:52 PM EDT (23:52 UTC)
Expired: Apr 27, 2023, 9:45 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 175

Counties Brevard County, FL, Martin County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 32 km from the middle of the area, began a volume at 23:53 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.9 hours before the alert went out and 61 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: 1461 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 739 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 122 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
Apr 27, 6:04 AM EDT	Mesoscale Discussion	SPC	Escambia, Santa Rosa	116 min
Apr 27, 6:43 AM EDT	Severe Thunderstorm Watch	SPC	Escambia, Okaloosa, Santa Rosa	8 hr
Apr 27, 10:09 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 9 more	2 hr
Apr 27, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	9 hr
Apr 27, 1:56 PM EDT	Mesoscale Discussion	SPC	Calhoun, Gadsden	2 hr
Apr 27, 2:19 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Clay, Columbia and 14 more	86 min
Apr 27, 2:46 PM EDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Brevard, Clay, Columbia and 19 more	7 hr
Apr 27, 4:34 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 3 more	86 min
Apr 27, 6:45 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 7 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2023 Every mesoscale discussion in 2023

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.