Alert archive / Florida / Special Weather Statements in 2012

Special Weather Statement, NWS Tampa Bay, FL

April 21, 2012Charlotte County, Lee County, Florida

NWS Tampa Bay, FL issued this special weather statement at Apr 21, 2012, 12:47 AM EDT for Charlotte County, Lee County, Florida. It was in force for 43 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: Apr 21, 2012, 12:47 AM EDT (04:47 UTC)
Expired: Apr 21, 2012, 1:30 AM EDT
In force: 43 min
Issued by: NWS Tampa Bay, FL

Counties Charlotte County, FL, Lee County, FL

The radar

The Tampa radar (KTBW), 124 km from the middle of the area, began a volume at 04:47 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

Miami, FL (KMFL), launched 00:00Z, 4.8 hours before the alert went out and 200 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: 1605 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

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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 Tampa Bay, FL wrote its last area forecast discussion before this special weather statement went out at Apr 20, 8:25 PM EDT, 4 hours 22 minutes earlier.

Area forecast discussion, Apr 20, 8:25 PM EDT, 4 hours 22 minutes before

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Hazardous weather outlook, Apr 20, 5:58 AM EDT, 18 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL
558 AM EDT FRI APR 20 2012

FLZ039-042-043-048>052-055>057-060>062-065-201600-
LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK-
MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE-
558 AM EDT FRI APR 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL AND SOUTHWEST
FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

...THUNDERSTORM IMPACT...
WEAK RIDGING WILL BUILD BACK OVER THE AREA TODAY AND THE SEABREEZE
WILL ALLOW FOR SCATTERED AFTERNOON AND EVENING SHOWERS AND
THUNDERSTORMS ACROSS THE AREA WITH THE BEST RAIN CHANCES INLAND
AND SOUTH. STRONG GUSTY WINDS...DEADLY LIGHTNING AND BRIEF HEAVY
DOWNPOURS WILL BE THE MAIN HAZARDS TODAY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

...THUNDERSTORM IMPACT...
AS LOW PRESSURE DEVELOPS IN THE CENTRAL GULF OVERNIGHT AND
GRADUALLY MOVES EAST OVER THE AREA THROUGH SUNDAY...SCATTERED TO
NUMEROUS STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE ACROSS
THE AREA. THE BEST CHANCES FOR SEVERE WEATHER WILL BE FROM TAMPA
BAY SOUTH THROUGH LEE COUNTY. DAMAGING WINDS...LARGE HAIL AND
ISOLATED TORNADOES WILL BE POSSIBLE WITH THE STRONGER STORMS. IN
ADDITION...THERE WILL BE WIDESPREAD 1 TO 2 INCHES OF RAINFALL
ACROSS THE AREA WITH THIS SYSTEM. BRIEF HEAVY DOWNPOURS MAY CAUSE
MINOR FLOODING. ALL RESIDENTS AND VISITORS SHOULD CLOSELY MONITOR
THE WEATHER THROUGH THE WEEKEND.

...WIND AND SEA IMPACT...
WINDS AND SEAS WILL INCREASE TO ADVISORY LEVELS FOR LATE IN THE
WEEKEND THROUGH EARLY NEXT WEEK AS THE LOW PRESSURE SYSTEM MOVES
ACROSS THE AREA AND HIGH PRESSURE BUILDS INTO THE AREA BEHIND IT.
SMALL CRAFT OPERATORS SHOULD CLOSELY MONITOR THIS DEVELOPING
SITUATION.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD MONITOR THE WEATHER AND SELF ACTIVATE IF NEEDED.

COLSON

In the hours before

Special weather statement, Apr 21, 12:47 AM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 2:15 PM EDT	Special Weather Statement	TBW	Levy	45 min
Apr 21, 2:19 PM EDT	Special Marine Warning	TBW		26 min
Apr 21, 2:32 PM EDT	Special Weather Statement	TBW	Hillsborough, Pasco	58 min
Apr 21, 2:33 PM EDT	Special Marine Warning	TBW		42 min
Apr 21, 2:35 PM EDT	Special Weather Statement	TBW	Charlotte, Manatee, Sarasota	85 min
Apr 21, 3:39 PM EDT	Special Weather Statement	TBW	Citrus, Hernando, Levy, Pasco, Sumter	66 min
Apr 21, 4:17 PM EDT	Small Craft Advisory	TBW		67 hr

Nearby

Special Weather Statements in Florida, 2012 Every special weather statement in 2012

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.