Alert archive / Florida / High Surf Advisories in 2020
High Surf Advisory 2, NWS Jacksonville, FL
NWS Jacksonville, FL issued this high surf advisory at Jan 21, 2020, 8:42 AM EST for Duval County, Flagler County, Nassau County, Florida. It took effect at Jan 21, 2020, 7:00 PM EST. It was in force for 54 hr.
The area
The counties it named.
The facts
- Issued
- Jan 21, 2020, 8:42 AM EST (13:42 UTC)
- In effect from
- Jan 21, 2020, 7:00 PM EST
- Expired
- Jan 24, 2020, 1:28 AM EST
- In force
- 54 hr
- Issued by
- NWS Jacksonville, FL
Counties Duval County, FL, Flagler County, FL, Nassau County, FL
The radar
The Jacksonville radar (KJAX), 40 km from the middle of the area, began a volume at 13:42 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 1.7 hours before the alert went out and 213 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 749 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this high surf advisory 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 high surf advisory went out at Jan 21, 5:29 AM EST, 3 hours 13 minutes earlier.
Area forecast discussion, Jan 21, 5:29 AM EST, 3 hours 13 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 21, 3:44 AM EST | Freeze Watch | JAX | Alachua, Baker, Bradford, Gilchrist, Marion, Nassau and 2 more | 5 hr |
| Jan 21, 3:47 AM EST | Gale Warning | JAX | 41 hr | |
| Jan 21, 8:42 AM EST | Coastal Flood Statement | JAX | Duval, Flagler, Nassau | 65 hr |
| Jan 21, 8:55 AM EST | Wind Chill Advisory | JAX | Alachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more | 23 hr |
| Jan 21, 8:56 AM EST | Freeze Warning | JAX | Alachua, Baker, Bradford, Flagler, Gilchrist, Marion and 3 more | 23 hr |
| Jan 21, 1:57 PM EST | Hard Freeze Warning | JAX | Alachua, Baker, Bradford, Gilchrist, Marion, Nassau and 2 more | 18 hr |
Nearby
High Surf Advisories in Florida, 2020Every high surf advisory 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.