Alert archive / Florida / Special Weather Statements in 2021
Special Weather Statement, NWS Jacksonville, FL
NWS Jacksonville, FL issued this special weather statement at Aug 1, 2021, 6:23 PM EDT for Nassau County, Florida. It was in force for 52 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
- Aug 1, 2021, 6:23 PM EDT (22:23 UTC)
- Expired
- Aug 1, 2021, 7:15 PM EDT
- In force
- 52 min
- Issued by
- NWS Jacksonville, FL
County Nassau County, FL
The radar
The Jacksonville radar (KJAX), 37 km from the middle of the area, began a volume at 22:27 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, 10.4 hours before the alert went out and 38 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
- 2380 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>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 Jacksonville, FL wrote its last area forecast discussion before this special weather statement went out at Aug 1, 3:28 PM EDT, 2 hours 55 minutes earlier.
Area forecast discussion, Aug 1, 3:28 PM EDT, 2 hours 55 minutes before
Area Forecast Discussion National Weather Service Jacksonville FL 328 PM EDT Sun Aug 1 2021 .Near Term.../through Monday/... High pressure will be southeast of the area Today, with a frontal zone just to the north. Scattered to numerous convection anticipated this afternoon and evening. The front will sink southeast Tonight into SE GA counties, which could keep activity going into the overnight hours. The surface front will stall over area during the day Monday, as 500mb trough digs into southeastern US. The combination of diurnal heating, convergence along the front and added instability associated with upper trough will yield a fairly active convective day on Monday. With the surface flow largely running along the surface boundary could see rounds of heavy rainfall training over the region. So, in addition to potential for strong to a few severe storms Monday afternoon, will also anticipate localized flooding. Temperatures Tonight will trend above normal, with a near to slightly below normal day on Monday. && .Short Term.../Monday night through Thursday/... The region remains in the base of a 500mb trough with a stalled frontal zone at the surface in place through Wednesday. This pattern will continue the stormy period, with rounds of convection expected. The pattern begins to change into Thursday, as the upper trough flattens, and the surface frontal zone lifts back to the north, as surface high pressure builds toward east. While it will still be moist and unstable enough for diurnally driven convection on Thursday, the chances will begin to trend down. Overnight lows will be near normal this period, while highs will trend below normal due to rain and cloud coverage. && .Long Term.../Thursday night through Sunday/... High pressure will extend across the area from a center to the east this period. While convective chances will be a little lower than earlier in the week, chances will still be higher than average. Temperatures will trend near normal at night, and a little below normal for highs. && .Marine... A frontal boundary will sink southeast into area Tonight, and stall through Wednesday. The boundary will lift back to the north and weaken later in the week, as high pressure builds toward the east. Rip Currents: Low through Monday. && .PRELIMINARY POINT TEMPS/POPS... AMG 75 90 72 82 71 / 60 90 70 90 60 SSI 78 89 76 84 75 / 50 90 80 90 60 JAX 77 93 74 85 73 / 30 90 70 90 50 SGJ 77 91 75 87 74 / 20 70 60 80 40 GNV 76 89 74 84 74 / 30 70 70 90 50 OCF 76 88 74 87 74 / 30 70 70 80 50 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. &&
In the hours before
Special weather statement, Aug 1, 5:18 PM EDT, 1 hour 5 minutes before
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</html>Special weather statement, Aug 1, 5:20 PM EDT, 1 hour 3 minutes before
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</html>Special weather statement, Aug 1, 5:25 PM EDT, 58 minutes before
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</html>Special weather statement, Aug 1, 5:58 PM EDT, 25 minutes before
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</html>Special weather statement, Aug 1, 6:09 PM EDT, 14 minutes before
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</html>Special weather statement, Aug 1, 6:23 PM EDT, 0 minutes before
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</html>The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 2:14 PM EDT | Special Marine Warning | JAX | 61 min | |
| Aug 1, 3:02 PM EDT | Special Marine Warning | JAX | 71 min | |
| Aug 1, 3:10 PM EDT | Special Weather Statement | JAX | Nassau | 35 min |
| Aug 1, 3:38 PM EDT | Special Marine Warning | JAX | 97 min | |
| Aug 1, 4:49 PM EDT | Special Marine Warning | JAX | 56 min | |
| Aug 1, 5:18 PM EDT | Special Weather Statement | JAX | Nassau | 42 min |
| Aug 1, 5:58 PM EDT | Special Weather Statement | JAX | Nassau | 62 min |
| Aug 1, 6:45 PM EDT | Special Weather Statement | JAX | Hamilton | 45 min |
| Aug 1, 6:53 PM EDT | Special Weather Statement | JAX | Duval | 52 min |
| Aug 1, 7:16 PM EDT | Special Weather Statement | JAX | Baker | 59 min |
| Aug 1, 7:34 PM EDT | Special Weather Statement | JAX | Columbia, Suwannee | 56 min |
| Jul 31, 10:06 PM EDT | Special Weather Statement | JAX | Bacon, Coffee | 39 min |
| Jul 31, 10:35 PM EDT | Special Weather Statement | JAX | Bacon, Brantley, Pierce | 40 min |
| Aug 1, 3:12 PM EDT | Special Weather Statement | JAX | Coffee | 48 min |
| Aug 1, 3:28 PM EDT | Special Weather Statement | JAX | Atkinson | 47 min |
| Aug 1, 3:46 PM EDT | Special Weather Statement | JAX | Camden, Ware | 59 min |
| Aug 1, 3:57 PM EDT | Special Weather Statement | JAX | Bacon, Coffee | 48 min |
| Aug 1, 4:10 PM EDT | Special Weather Statement | JAX | Clinch | 50 min |
| Aug 1, 4:39 PM EDT | Special Weather Statement | JAX | Pierce | 51 min |
| Aug 1, 4:42 PM EDT | Special Weather Statement | JAX | Atkinson | 48 min |
| Aug 1, 4:44 PM EDT | Special Weather Statement | JAX | Ware | 46 min |
| Aug 1, 4:47 PM EDT | Special Weather Statement | JAX | Camden | 43 min |
| Aug 1, 5:20 PM EDT | Special Weather Statement | JAX | Clinch | 55 min |
| Aug 1, 5:25 PM EDT | Special Weather Statement | JAX | Charlton | 50 min |
| Aug 1, 6:09 PM EDT | Special Weather Statement | JAX | Clinch, Echols | 51 min |
Nearby
Special Weather Statements in Florida, 2021Every special weather statement in 2021
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.