Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 84, NWS Tampa Bay, FL

June 21, 2001Pinellas County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jun 21, 2001, 1:04 PM EDT for Pinellas County, Florida. It was in force for 31 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 21, 2001, 1:04 PM EDT (17:04 UTC)
Expired: Jun 21, 2001, 1:35 PM EDT
In force: 31 min
Issued by: NWS Tampa Bay, FL
Area: Whole counties

County Pinellas County, FL

The radar

The Tampa radar (KTBW), 40 km from the middle of the area, began a volume at 17:08 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.

What was reported inside it

Time	Report	Where	Remark
Jun 21, 1:10 PM EDT	Hail 1.75	Pinellas Park, FL	The public reported, through Bay News 9 Cable, golfball to dime sized hail, from near the intersection of U.S. Highway 19 and 49th Street in Pinellas Park to the intersection of Interstate 275 and State Road 694 (Gandy Blvd) in St. Petersburg.
Jun 21, 1:20 PM EDT	Thunderstorm Wind	Pinellas Park, FL	Bay News 9 Cable reported that thunderstorm winds downed a few large trees and several large branches on 66th and 118th Streets in Pinellas Park.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 5.1 hours before the alert went out and 40 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: 1342 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KTBW 211705
SVRTBW
FLC103-211735-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
104 PM EDT THU JUN 21 2001

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN PINELLAS COUNTY IN FLORIDA.

* UNTIL 135 PM EDT.

* AT 104 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL...OVER PINELLA|S PARK...MOVING
  EAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  PINELLAS PARK.

$$

LAT...LON 2796 8284 2779 8279 2783 8255 2802 8265

69
NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 21, 9:47 AM EDT, 3 hours 17 minutes earlier.

Area forecast discussion, Jun 21, 9:47 AM EDT, 3 hours 17 minutes before

WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
947 AM EDT THU JUN 21 2001

12Z SOUNDING A TOUCH MORE UNSTABLE THIS MORNING...BUT NOT
SIGNIFICANT. WINDS BETWEEN 1K AND 3K FEET HAVE VEERED MORE TO THE
SOUTH THIS MORNING...BUT GENERAL DIRECTION IN THE LOWEST 10K FEET
REMAINS LIGHT SOUTHEAST FOR ANOTHER DAY. BY AFTERNOON...EXPECT A
TRANSITION TO A MORE SOUTHERLY FLOW AS THE SURFACE RIDGE CONTINUES
TO SLOWLY SLIP SOUTH IN RESPONSE TO DIGGING UPPER TROF. CEDAR KEY
ALREADY HAS A SOUTHWEST WIND AT 9 AM...A SIGN OF THE CHANGES TO
COME. NO REASON TO CHANGE ONGOING FORECAST AT THIS TIME.

.TBW...NONE.

ALSHEIMER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:59 PM EDT	Severe Thunderstorm Warning	TBW	Citrus	31 min
Jun 21, 3:16 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	29 min
Jun 21, 3:55 PM EDT	Severe Thunderstorm Warning	TBW	Highlands	35 min
Jun 21, 4:38 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	52 min
Jun 21, 5:34 PM EDT	Severe Thunderstorm Warning	TBW	Pasco	41 min
Jun 21, 6:06 PM EDT	Severe Thunderstorm Warning	TBW	Polk	39 min
Jun 21, 6:42 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough	48 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.