Alert archive / Florida / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 209, NWS Tallahassee, FL
NWS Tallahassee, FL issued this severe thunderstorm warning at Aug 11, 2020, 2:26 PM CDT for 5 counties in Florida. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2020, 2:26 PM CDT (19:26 UTC)
- Expired
- Aug 11, 2020, 3:30 PM CDT
- In force
- 64 min
- Issued by
- NWS Tallahassee, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bay County, FL, Calhoun County, FL, Holmes County, FL, Jackson County, FL, Washington County, FL
The radar
The Eglin Afb radar (KEVX), 40 km from the middle of the area, began a volume at 19:26 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.4 hours before the alert went out and 117 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.
- Mixed-layer CAPE
- 1281 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 910 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 1:15 PM CDT, 1 hour 11 minutes earlier.
Area forecast discussion, Aug 11, 1:15 PM CDT, 1 hour 11 minutes before
Area Forecast Discussion National Weather Service Tallahassee FL 215 PM EDT Tue Aug 11 2020 .NEAR TERM [Through Wednesday]... We are still expecting scattered to numerous showers and thunderstorms this afternoon as the sea breeze boundary moves inland and a weak upper level vort max slides southward. Boundary collisions this afternoon could result in some storms briefly becoming severe with gusty winds the main threat. The SPC has outlooked portions of the area in a marginal risk for severe storms. Convection will gradually weaken this evening after sunset, but some convection will likely linger well into the evening hours. Overnight lows will generally be in the low to mid 70s. For Wednesday, similar conditions are expected with plentiful deep moisture and weak upper level support. Scattered to numerous showers and thunderstorms are expected again during the afternoon hours. Afternoon highs will generally be in the low to mid 90s. .SHORT TERM [Wednesday Night Through Thursday Night]... Widespread showers and thunderstorms are expected again on Thursday as PWs remain near or just over 2 inches. Overall storm motion will be pretty slow with light steering flow. Forecast soundings show enough instabililty and an inverted V shape with DCAPE near 1000 J/kg. This along with the slow storm motion will keep the primary threats as gusty winds and heavy rainfall. Weak upper support will help drive more widespread coverage, but overall placement will probably be driven mostly by the seabreeze and then subsequent boundary collisions. High temperatures on Thursday are forecast generally in the upper 80s to low 90s. Patchy fog will be possible in the early mornings, especially in areas that receive rainfall. .LONG TERM [Friday Through Tuesday]... Scattered to widespread showers and thunderstorms are expected through the long term period with a little bit better upper level support Friday into the weekend as a more substantial shortwave moves slowly across the southeast CONUS. At a minimum, this will help increase our steering flow and speed up the storm motions, but could also lead to more widespread convection. By Sunday, a weak front could sag into our area before stalling, which could bring a touch drier air into the area and serve as another focus for showers and storms Sunday into Monday. High temperatures through the long term are generally in the low to mid 90s each afternoon. && .AVIATION... [Through 18Z Wednesday] Scattered to numerous showers and thunderstorms will produce occasional restrictions across the area through the late evening hours. Some brief restrictions due to low clouds and patchy fog are also possible early Wednesday morning, mainly near VLD. && .MARINE... Generally benign boating conditions are expected with winds around 10 knots or less and seas near 1 ft. Waterspouts, gusty winds and locally higher seas will be possible with any showers and thunderstorms over the next few days. && .FIRE WEATHER... Humid conditions and high rain chances will keep fire weather concerns low through the week. Patchy fog will be possible in the mornings, especially in areas that receive rainfall the previous day. && .HYDROLOGY... A wetter pattern is expected this week with widespread rainfall totals of 1 to 3 inches of rainfall expected over the next 7 days with locally higher amounts possible. While river flooding is not expected, some localized areas of minor street flooding are possible each afternoon. && .SPOTTER INFORMATION STATEMENT... Spotter activation is not requested. However, spotters are always encouraged to safely report significant weather conditions when they occur (while following all local, state, and CDC guidelines) by calling the office or tweeting us @NWSTallahassee. && .PRELIMINARY POINT TEMPS/POPS... Tallahassee 74 93 74 91 74 / 40 70 40 80 40 Panama City 78 90 78 90 78 / 30 50 40 60 30 Dothan 74 94 74 92 73 / 40 60 40 80 40 Albany 74 95 75 92 74 / 50 60 50 80 40 Valdosta 73 92 74 89 73 / 60 70 50 80 30 Cross City 74 90 74 91 74 / 50 70 40 70 30 Apalachicola 76 89 78 89 77 / 40 50 40 50 30 && .TAE WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AL...None. GM...None. && NEAR TERM...DVD SHORT TERM...Merrifield LONG TERM...Merrifield AVIATION...DVD MARINE...Merrifield FIRE WEATHER...Merrifield HYDROLOGY...Merrifield
In the hours before
Special weather statement, Aug 11, 1:20 PM CDT, 1 hour 6 minutes before
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</html>Special weather statement, Aug 11, 1:21 PM CDT, 1 hour 5 minutes before
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</html>Local storm report, Aug 11, 1:23 PM CDT, 1 hour 3 minutes before
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</html>Special weather statement, Aug 11, 1:46 PM CDT, 40 minutes before
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</html>Local storm report, Aug 11, 2:10 PM CDT, 16 minutes before
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</html>Local storm report, Aug 11, 2:19 PM CDT, 7 minutes before
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</html>The office that day
Everything else NWS Tallahassee, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:15 AM CDT | Special Marine Warning | TAE | 60 min | |
| Aug 11, 10:05 AM CDT | Special Marine Warning | TAE | 40 min | |
| Aug 11, 11:05 AM CDT | Special Weather Statement | TAE | Liberty | 40 min |
| Aug 11, 11:43 AM CDT | Special Weather Statement | TAE | Gadsden, Liberty | 62 min |
| Aug 11, 12:16 PM CDT | Special Weather Statement | TAE | Taylor | 44 min |
| Aug 11, 12:25 PM CDT | Special Weather Statement | TAE | Leon | 20 min |
| Aug 11, 12:36 PM CDT | Severe Thunderstorm Warning | TAE | Calhoun, Gadsden, Jackson, Leon, Liberty, Wakulla | 39 min |
| Aug 11, 12:46 PM CDT | Special Weather Statement | TAE | Wakulla | 44 min |
| Aug 11, 12:52 PM CDT | Special Marine Warning | TAE | 83 min | |
| Aug 11, 1:11 PM CDT | Special Weather Statement | TAE | Leon | 49 min |
| Aug 11, 1:20 PM CDT | Special Weather Statement | TAE | Gulf | 40 min |
| Aug 11, 1:30 PM CDT | Special Marine Warning | TAE | 2 hr | |
| Aug 11, 1:46 PM CDT | Special Weather Statement | TAE | Jefferson | 59 min |
| Aug 11, 1:57 PM CDT | Severe Thunderstorm Warning | TAE | Jackson | 63 min |
| Aug 11, 2:03 PM CDT | Severe Thunderstorm Warning | TAE | Franklin, Gulf | 43 min |
| Aug 11, 2:50 PM CDT | Special Weather Statement | TAE | Jefferson, Madison | 55 min |
| Aug 11, 3:02 PM CDT | Severe Thunderstorm Warning | TAE | Bay, Holmes, Walton, Washington | 73 min |
| Aug 11, 3:41 PM CDT | Special Marine Warning | TAE | 94 min | |
| Aug 11, 3:44 PM CDT | Severe Thunderstorm Warning | TAE | Holmes, Walton | 61 min |
| Aug 10, 8:06 PM CDT | Special Weather Statement | TAE | Quitman | 39 min |
| Aug 10, 8:20 PM CDT | Severe Thunderstorm Warning | TAE | Clay, Quitman, Randolph | 40 min |
| Aug 10, 8:42 PM CDT | Special Weather Statement | TAE | Clay, Quitman, Randolph | 48 min |
| Aug 11, 12:02 PM CDT | Special Weather Statement | TAE | Decatur | 43 min |
| Aug 11, 1:08 PM CDT | Special Weather Statement | TAE | Seminole | 52 min |
| Aug 11, 3:09 PM CDT | Severe Thunderstorm Warning | TAE | Grady, Thomas | 51 min |
| Aug 11, 3:34 PM CDT | Areal Flood Advisory | TAE | Thomas | 116 min |
| Aug 11, 4:12 PM CDT | Special Weather Statement | TAE | Colquitt, Tift | 48 min |
| Aug 11, 4:24 PM CDT | Special Weather Statement | TAE | Calhoun, Clay, Quitman, Randolph | 51 min |
| Aug 11, 4:36 PM CDT | Special Weather Statement | TAE | Baker, Dougherty, Mitchell | 39 min |
| Aug 11, 4:49 PM CDT | Areal Flood Advisory | TAE | Clay, Quitman, Randolph | 116 min |
| Aug 11, 4:53 PM CDT | Areal Flood Advisory | TAE | Baker, Dougherty, Mitchell | 2 hr |
| Aug 11, 5:06 PM CDT | Areal Flood Advisory | TAE | Calhoun, Randolph | 114 min |
| Aug 11, 5:08 PM CDT | Special Weather Statement | TAE | Quitman | 52 min |
| Aug 11, 6:17 PM CDT | Special Weather Statement | TAE | Randolph, Terrell | 43 min |
| Aug 11, 1:21 PM CDT | Special Weather Statement | TAE | Dale | 39 min |
| Aug 11, 1:51 PM CDT | Severe Thunderstorm Warning | TAE | Dale, Geneva, Houston | 54 min |
| Aug 11, 2:40 PM CDT | Areal Flood Advisory | TAE | Dale, Houston | 2 hr |
| Aug 11, 2:44 PM CDT | Special Weather Statement | TAE | Dale | 31 min |
| Aug 11, 3:07 PM CDT | Special Weather Statement | TAE | Coffee | 38 min |
| Aug 11, 3:19 PM CDT | Special Weather Statement | TAE | Henry | 41 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2020Every severe thunderstorm warning in 2020
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.