Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 221, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 2, 2001, 6:03 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 42 min. 3 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
- Sep 2, 2001, 6:03 PM EDT (22:03 UTC)
- Expired
- Sep 2, 2001, 6:45 PM EDT
- In force
- 42 min
- Issued by
- NWS Jacksonville, FL
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Duval County, FL, Saint Johns County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 2, 6:15 PM EDT | Thunderstorm Wind | Mandarin, FL | Large trees were blown down. |
| Sep 2, 6:30 PM EDT | Thunderstorm Wind | Palmo, FL | Large trees were blown down. |
| Sep 2, 6:45 PM EDT | Thunderstorm Wind | Jacksonville, FL | Large trees were blown down. |
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
Jacksonville, FL (KJAX), launched 12:00Z, 10.1 hours before the alert went out and 45 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
- 1773 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 2, 2:00 PM EDT, 4 hours 3 minutes earlier.
Area forecast discussion, Sep 2, 2:00 PM EDT, 4 hours 3 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSONVILLE FL 200 PM EDT SUN SEP 2 2001 DENSE OVERCAST CIRRUS LINGERS NORTH OF SSI TO HAZELHURST GA. BREAKS IN THE CLOUD COVER SOUTH OF AYS-JAX HAVE ALLOWED A CU FIELD TO DEVELOP. CONVECTION FROM THE BIG BEND SEA BREEZE IS PUSHING INTO THE SUWANNEE VALLEY AND WILL BEGIN TO MOVE EAST ACROSS THE CWA. SURFACE ANALYSIS SHOWS A RIDGE SOUTH OF THE FA...THE BACKDOOR FRONT IS WELL TO OUR NORTH AND A WEAK TROUGH EXTENDS INTO OUR COASTAL WATERS. MODELS ARE QUITE SIMILAR WITH THE MOISTURE FIELD BUT AVN INITIALIZED THE LOW OVER LOUISIANA BEST ALTHOUGH MESOETA WAS CLOSE. THIS LOW WILL MOVE INTO NORTHERN AL AND TN ON MONDAY INCREASING RAIN CHANCES TREMENDOUSLY TO THE NORTH AND WEST OF OUR CWA. HOWEVER THE CWA WILL EXPERIENCE AOA CLIMO POPS DUE TO MOIST WESTERLY FLOW AND SEA BREEZE INTERACTIONS. BY TUESDAY EVENING A COLD FRONT WILL EXTEND FROM AL TO TN/NC AND DEEP MOISTURE WILL STRETCH ALONG THE GULF COAST TO THE MID ATLANTIC COAST INCLUDING NORTH FLORIDA. WILL KEEP GOOD CHANCE PRECIP AND LEAN TOWARD MAV FOR TEMPS. A SERIES OF LOW WILL LINGER ALONG THE FRONT WHILE IT STALLS ACROSS SOUTHERN GA TO MS THROUGH THE WEEK. THIS BOUNDARY WILL FINALLY BE PULLED AWAY BY AN UPPER TROUGH LATER IN THE WEEKEND. MARINE...EXPECT GENERALLY SOUTH TO SOUTHWEST FLOW THROUGH THE PERIOD EXCEPT FOR SHIFT TO ONSHORE DURING THE AFTERNOONS. PRELIM AMG 70/90/71/88 4545 SSI 73/86/75/88 4545 JAX 71/90/73/90 4535 GNV 70/90/71/90 3435 28 .JAX... .GA...NONE. .FL...NONE. MKT/MZ
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 4:55 PM EDT | Severe Thunderstorm Warning | JAX | Clay | 65 min |
| Sep 2, 7:08 PM EDT | Tornado Warning | JAX | Nassau | 52 min |
| Sep 2, 6:13 PM EDT | Tornado Warning | JAX | Glynn | 47 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2001Every 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.