Alert archive / California / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 8, NWS Los Angeles, CA
NWS Los Angeles, CA issued this severe thunderstorm warning at Jul 13, 1999, 3:06 PM PDT for Los Angeles County, California. It was in force for 24 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 13, 1999, 3:06 PM PDT (22:06 UTC)
- Expired
- Jul 13, 1999, 3:30 PM PDT
- In force
- 24 min
- Issued by
- NWS Los Angeles, CA
- Area
- Whole counties
County Los Angeles County, CA
The nearest sounding before it
Edwards AFB, CA (KEDW), launched 12:00Z, 10.1 hours before the alert went out and 89 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
- 296 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1537 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 30 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 Los Angeles, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 13, 2:00 PM PDT, 1 hour 6 minutes earlier.
Area forecast discussion, Jul 13, 2:00 PM PDT, 1 hour 6 minutes before
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 2 PM PDT TUE JUL 13 1999 TSTMS DVLPG ERY THIS AFTN FROM SERN SLO CNTY THRU THE VTU AND LA CNTY MTNS. ONE CELL OVR VTU MTNS HAS ALRDY PROMPTED A FLASH FLD WRNG. MRNG SOUNDG SHOWED BOTH VBG AND NKX PW OVR 1.8 IN AND UNSTBL INDICES...SO FLASH FLOOD WATCH WAS ISSUED ERY TDA AND WILL BE CONTD IN AFTN PKG. ETA SHOWED AN AREA OF STG MID LVL LIFT OVR VTU/LA CNTY MTNS THIS MRNG AND THIS APPEARS TO WORKG OUT WELL SO FAR. THIS PROMISES TO BE A VRY ACTV AFTN BUT SHUD BE THE LAST. MDLS SAG POSTIVE TILT UPR TROF SWWD OVR W CST STATES WITH MID AND UPR FLO BCMG MORE SWLY AND DRYR WED. AVN MORE AGGRESSIVE WITH DRYG TREND BUT ALL MDLS ARE MUCH DRYR. SO NO SHWRS/TSTMS IN FCST WED...XCP MAY BE ENUF RESIDUAL MSTR FOR LIMITED CONVECTION LA CNTY MTNS AND DESERTS SO WILL KEEP SLGT CHC THESE LCTNS. COOLR EACH DAY ALL ZONES WITH A LTL LWR HGTS. VLYS MUCH COOLR...10 DEG OR MORE OVR 2 DAYS AS PRES GRADS TURN ONSHR. MARINE LYR BGNG TO REFORM ALG CNTRL CST LT TNGT AND OVR SRN CA CST WED NGT... WITH TYPICAL NGT/MRNG ST/FG. DRY SWLY FLO XPCD TO CONT THRU EXTDD PD. LAX 2000. HENDERSON .LAX...FLASH FLOOD WATCH...SEE LAXFFALAX.
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 5:15 PM PDT | Flash Flood Warning | LOX | Los Angeles | 60 min |
| Jul 12, 6:15 PM PDT | Flash Flood Warning | LOX | Los Angeles | 60 min |
| Jul 12, 11:15 PM PDT | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Jul 12, 11:55 PM PDT | Flash Flood Warning | LOX | Los Angeles | 2 hr |
| Jul 13, 12:30 AM PDT | Flash Flood Warning | LOX | Ventura | 90 min |
| Jul 13, 1:50 AM PDT | Flash Flood Warning | LOX | Los Angeles, Santa Barbara, Ventura | 3 hr |
| Jul 13, 4:40 AM PDT | Flash Flood Warning | LOX | Santa Barbara | 2 hr |
| Jul 13, 12:13 PM PDT | Flash Flood Warning | LOX | Ventura | 47 min |
| Jul 13, 1:00 PM PDT | Flash Flood Warning | LOX | Ventura | 90 min |
| Jul 13, 2:00 PM PDT | Severe Thunderstorm Warning | LOX | Santa Barbara, Ventura | 60 min |
| Jul 13, 2:25 PM PDT | Flash Flood Warning | LOX | Los Angeles, Santa Barbara, Ventura | 95 min |
| Jul 13, 2:25 PM PDT | Flash Flood Warning | LOX | San Luis Obispo | 95 min |
| Jul 13, 4:00 PM PDT | Flash Flood Warning | LOX | Santa Barbara | 60 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.