Alert archive / California / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 55, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 30, 2000, 7:16 PM PDT for Imperial County, California. It was in force for 59 min. 1 report 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
- Aug 30, 2000, 7:16 PM PDT (02:16 UTC)
- Expired
- Aug 30, 2000, 8:15 PM PDT
- In force
- 59 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Imperial County, CA
The radar
The Yuma radar (KYUX), 90 km from the middle of the area, began a volume at 02:19 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 30, 7:45 PM PDT | Tornado F0 | Glamis, CA | Motorist reported tornado near Glamis, lasting about 15 minutes before it roped out and dissipated. |
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
San Diego, CA (KNKX), launched 00:00Z, 2.3 hours before the alert went out and 173 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
- 906 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 110 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 Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 30, 2:40 PM PDT, 4 hours 36 minutes earlier.
Area forecast discussion, Aug 30, 2:40 PM PDT, 4 hours 36 minutes before
AZZ020>028-CAZ030>033-310545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 240 PM MST WED AUG 30 2000 .SYNOPSIS... A MOIST AIRMASS WILL REMAIN IN PLACE FOR ABOUT ONE MORE DAY BEFORE A SIGNIFICANT UPPER LEVEL LOW PRESSURE AREA OFF THE CALIFORNIA COAST IMPORTS MUCH DRIER AIR INTO THE DESERT SOUTHWEST BY THE END OF THE WEEK. UNTIL THEN...YOU CAN STILL EXPECT ISOLATED AFTERNOON AND EVENING THUNDERSTORMS OVER SOUTH CENTRAL ARIZONA ON THURSDAY. THE LABOR DAY WEEKEND IS SHAPING UP TO BE MOSTLY SUNNY WITH NEAR NORMAL TEMPERATURES ALONG WITH SOME AFTERNOON BREEZINESS. .DISCUSSION... SEVERE THUNDERSTORM WATCH SEEMS TO BE WORKING OUT WELL...ESPECIALLY TO THE S AND E OF PHX METRO AREA. SEEMS LIKE SOME LOWER DEWPOINTS AND SOMEWHAT MORE STABLE AIR HAS PUSHED INTO MUCH OF THE GREATER PHX AREA THIS AFTERNOON. VISIBLE IMAGERY SHOWS NICE...LARGE OUTFLOW BOUNDARY THAT WAS GENERATED BY CONVECTION ALONG MEXICAN BORDER INTERSECTING WITH OTHER STORM OUTFLOWS AND PRODUCING NEW STORM DEVELOPMENT...AGAIN MAINLY E AND S OF PHX. SOME TRAINING APPEARS TO BE HAPPENING AND RESULTING IN ISOLATED 1 TO 2 INCH DOPPLER ESTIMATED RAINFALLS. ALSO ...GOOD DUST STORM WAS GENERATED TO SE OF PHX NEAR CASA GRANDE/ COOLIDGE AREA. NEW 18Z MESO-ETA SHOWING MAIN EFFECTS OF VORT MAX WILL STAY OVER OUR ERN CWFA THIS EVENING...WITH NVA TONIGHT AND THUNDER- STORM GENERATED LOW LEVEL STABLIZATION CUTTING OFF STORMS PRETTY EARLY. MEANWHILE...THURSDAY IS SHAPING UP TO BE A RELATIVELY QUIET DAY...WITH NO GOOD TRIGGER FORESEEN. HOWEVER...SLIGHT UPPER DIFFLUENT FLOW COMBINED WITH CONTINUED MOIST LOWER LEVELS MAY RESULT IN ISOLD REDEVELOPMENT TOMORROW AFTERNOON...MAINLY MARICOPA COUNTY EWD. BY FRIDAY...MODELS STILL ADVERTIZING INCREASING SWLY FLOW ALOFT WHICH WILL LIKELY MIX MUCH DRIER AIR TO THE SURFACE. WILL TALK ABOUT LOWER HUMIDITIES MOST AREAS BY THEN. SHOULD ALSO BE SOME BREEZY TO LOCALLY WINDY CONDITIONS...MAINLY HIGHER TERRAIN. THE HOLIDAY WEEKEND IS SHAPING UP TO BE QUIET WITH OUR FIRST BREAK IN THE MONSOON AS STRONG SWLY FLOW ALOFT PERSISTS. IN FACT...THIS BREAK LIKELY TO LAST AT LEAST ALL OF NEXT WEEK. ESTLE
Nearby
Severe Thunderstorm Warnings in California, 2000Every severe thunderstorm warning in 2000
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; radar from the NEXRAD Level II archive.