Alert archive / Florida / Special Weather Statements in 2017

Special Weather Statement, NWS Tallahassee, FL

July 20, 2017Madison County, Florida

NWS Tallahassee, FL issued this special weather statement at Jul 20, 2017, 4:39 PM EDT for Madison County, Florida. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2017, 4:39 PM EDT (20:39 UTC)
Expired: Jul 20, 2017, 5:30 PM EDT
In force: 51 min
Issued by: NWS Tallahassee, FL

County Madison County, FL

The radar

The Moody AFB radar (KVAX), 67 km from the middle of the area, began a volume at 20:40 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

Jacksonville, FL (KJAX), launched 12:00Z, 8.7 hours before the alert went out and 149 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: 861 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this special weather statement went out at Jul 20, 3:53 PM EDT, 46 minutes earlier.

Area forecast discussion, Jul 20, 3:53 PM EDT, 46 minutes before

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In the hours before

Special weather statement, Jul 20, 3:18 PM EDT, 1 hour 21 minutes before

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Special weather statement, Jul 20, 3:22 PM EDT, 1 hour 17 minutes before

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Special weather statement, Jul 20, 4:17 PM EDT, 22 minutes before

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Special weather statement, Jul 20, 4:39 PM EDT, 0 minutes before

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The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 3:18 PM EDT	Special Weather Statement	TAE	Franklin	42 min
Jul 20, 3:22 PM EDT	Special Weather Statement	TAE	Taylor	38 min
Jul 20, 4:17 PM EDT	Special Weather Statement	TAE	Gulf	43 min
Jul 20, 5:26 PM EDT	Special Weather Statement	TAE	Madison	34 min
Jul 20, 5:41 PM EDT	Special Weather Statement	TAE	Walton	34 min
Jul 20, 5:48 PM EDT	Special Marine Warning	TAE		27 min
Jul 20, 7:12 PM EDT	Special Weather Statement	TAE	Leon	33 min
Jul 20, 7:34 PM EDT	Special Weather Statement	TAE	Grady	26 min

Nearby

Special Weather Statements in Florida, 2017 Every special weather statement 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.