Alert archive / California / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 3, NWS San Diego, CA
NWS San Diego, CA issued this severe thunderstorm warning at Jul 28, 1999, 4:04 PM PDT for San Diego County, California. It was in force for 41 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
- Jul 28, 1999, 4:04 PM PDT (23:04 UTC)
- Expired
- Jul 28, 1999, 4:45 PM PDT
- In force
- 41 min
- Issued by
- NWS San Diego, CA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County San Diego County, CA
The radar
The San Diego radar (KNKX), 28 km from the middle of the area, began a volume at 22:54 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
San Diego, CA (KNKX), launched 12:00Z, 11.1 hours before the alert went out and 47 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
- 762 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 San Diego, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 28, 2:05 PM PDT, 1 hour 59 minutes earlier.
Area forecast discussion, Jul 28, 2:05 PM PDT, 1 hour 59 minutes before
EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
205 PM PDT WED JUL 28 1999
...SYNOPSIS...
A TROUGH OF LOW PRESSURE WILL REMAIN OFF THE WEST COAST THROUGH THE
WEEKEND WITH BROAD HIGH PRESSURE COVERING MOST OF THE SOUTHERN U.S.
MONSOONAL MOISTURE WILL CONTINUE TO AFFECT THE MOUNTAINS AND DESERTS
WITH SCATTERED THUNDERSTORMS THROUGH AT LEAST THURSDAY. AT THE
COAST...NIGHT AND MORNING LOW CLOUDS WILL CONTINUE. LITTLE
TEMPERATURE CHANGE IS EXPECTED THROUGH FRIDAY.
...DISCUSSION...
SAT LOOPS AND RADAR SHOW SCATTERED SHOWERS AND ISOLATED HEAVY
THUNDERSTORMS HAVE BEEN AFFECTING THE MOUNTAIN AREAS SINCE MIDDAY.
RAINFALL RATES OF 3/4 TO 1 INCH PER HALF HOUR HAVE BEEN OBSERVED. A
SMALL STREAM FLOOD ADVISORY IS IN EFFECT UNTIL 500 PM.
12Z ETA MODEL SHOWS RAPID DRYING OF THE ATMOSPHERE OVER THE DESERTS
AND MTNS BY LATE TOMORROW WHILE THE AVN HOLDS ONTO MORE MOISTURE.
WILL CONTINUE WITH THUNDERSTORMS/SHOWERS THROUGH TOMORROW AND THEN
TREND DOWNEARD AS WEAK WAVE IN AZ GETS CAUGHT UP IN THE WESTERLIES.
AT THE COAST...LITTLE CHANGE IN THICKNESS AND ONSHORE GRADIENTS
LIKELY TO KEEP MARINE LAYER FAIRLY DEEP AND DIURNAL STRATUS AROUND
THROUGH FRIDAY...AS LONG AS SEA SURFACE TEMPS REMAIN CHILLY. WILL
KEEP TEMPS CONSISTENT WITH PREVIOUS FORECASTS.
LONGER RANGE...MRF AND ECMWF SHOW BETTER WESTERLY FLOW ALOFT FOR
DRYING AND NEAR NORMAL TEMPS INLAND.
SAN 000
.SAN...NONE.
JADThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 3:20 PM PDT | Flash Flood Warning | SGX | San Diego | 85 min |
| Jul 28, 4:43 PM PDT | Flash Flood Warning | SGX | San Diego | 32 min |
Nearby
Severe Thunderstorm Warnings in California, 1999Every severe thunderstorm warning in 1999
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.