Alert archive / Florida / Mesoscale Discussions in 2010

Mesoscale Discussion 402

April 25, 201017 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2010, 9:30 PM EDT for 17 counties in Florida. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2010, 9:30 PM EDT (01:30 UTC)
Expired: Apr 25, 2010, 10:30 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Manatee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 45 km from the middle of the area, began a volume at 01:34 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.

Tornado Watch 107Apr 25, 11:30 PM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 1.5 hours before the alert went out and 288 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: 2012 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 755 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 11:10 PM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, Collier, DeSoto, Glades, Hardee and 14 more	95 min
Apr 25, 11:28 PM EDT	Tornado Watch	SPC	Brevard, Charlotte, Collier, DeSoto, Glades, Hardee and 19 more	8 hr
Apr 26, 2:42 AM EDT	Mesoscale Discussion	SPC	Collier, Glades, Hendry, Indian River, Martin, Okeechobee and 1 more	63 min
Apr 26, 4:45 AM EDT	Mesoscale Discussion	SPC	Collier, Hendry, Palm Beach	60 min
Apr 26, 8:01 AM EDT	Mesoscale Discussion	SPC	Broward, Miami-Dade, Monroe	89 min

Nearby

Mesoscale Discussions in Florida, 2010 Every mesoscale discussion in 2010

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.