Alert archive / Florida / Freeze Watches in 2021
Freeze Watch 1, NWS Jacksonville, FL
NWS Jacksonville, FL issued this freeze watch at Jan 8, 2021, 1:36 PM EST for 5 counties in Florida. It took effect at Jan 10, 2021, 2:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Jan 8, 2021, 1:36 PM EST (18:36 UTC)
- In effect from
- Jan 10, 2021, 2:00 AM EST
- Expired
- Jan 9, 2021, 2:46 AM EST
- In force
- Issued by
- NWS Jacksonville, FL
Counties Alachua County, FL, Bradford County, FL, Flagler County, FL, Marion County, FL, Nassau County, FL
The radar
The Jacksonville radar (KJAX), 81 km from the middle of the area, began a volume at 18:37 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
Tampa Bay, FL (KTBW), launched 12:00Z, 6.6 hours before the alert went out and 236 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
- 10 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 925 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze watch 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 freeze watch went out at Jan 8, 1:07 PM EST, 29 minutes earlier.
Area forecast discussion, Jan 8, 1:07 PM EST, 29 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 |
|---|---|---|---|---|
| Jan 8, 9:56 AM EST | River Flood Warning | JAX | Pierce, Ware | 23 hr |
Nearby
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.