Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 60, NWS Phoenix, AZ

October 21, 2000Yuma County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 21, 2000, 3:46 PM MST for Yuma County, Arizona. It was in force for 59 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
Oct 21, 2000, 3:46 PM MST (22:46 UTC)
Expired
Oct 21, 2000, 4:45 PM MST
In force
59 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Yuma County, AZ

The radar

The Yuma radar (KYUX), 77 km from the middle of the area, began a volume at 22:45 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

Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 10.8 hours before the alert went out and 55 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.

Skew-T log-pSkew-T log-p diagram, Yuma Prvg Ground, AZ at 12:00Z on 2000-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Yuma Prvg Ground, AZ at 12:00Z on 2000-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
18 J/kg
Mixed-layer CIN
-255 J/kg
Mixed-layer LCL
1662 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KPSR 212246
SVRPHX
AZC027-212345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
346 PM MST SAT OCT 21 2000

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN YUMA COUNTY IN SOUTHWESTERN ARIZONA

* UNTIL 445 PM MST

* AT 335 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR YUMA...MOVING NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  NORTH YUMA AND MARTINEZ LAKE BETWEEN 350 PM AND 4 PM.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

SAS

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 Oct 21, 3:15 PM MST, 31 minutes earlier.

Area forecast discussion, Oct 21, 3:15 PM MST, 31 minutes before
AZZ020>028-CAZ030>033-220545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
315 PM MST SAT OCT 21 2000

.SYNOPSIS...
A STRONG PACIFIC WEATHER SYSTEM IS FORECAST TO MOVE INTO SOUTHERN
CALIFORNIA AND SOUTHWEST ARIZONA BY TONIGHT. IT WILL REMAIN NEARLY
STATIONARY THROUGH SUNDAY AND SUNDAY NIGHT. IT WILL BRING A WIDE
AREA OF RAIN ALONG WITH SCATTERED THUNDERSTORMS TO SOUTHWEST ARIZONA
AND SOUTHEAST CALIFORNIA THROUGH SUNDAY NIGHT AND MONDAY. RAINFALL
AMOUNTS COULD BE QUITE HEAVY DURING THAT PERIOD WITH FROM 1 TO 2
INCHES POSSIBLE IN SOME AREAS BY MONDAY MORNING. IT WILL BECOME MORE
SHOWERY LATE MONDAY AND TUESDAY...WITH SHOWERS MAINLY OVER CENTRAL
ARIZONA EARLY TUESDAY. PARLTY CLOUDY AND WARMER WEATHER IS FORECAST
FOR WEDNESDAY AND THURSDAY.

.DISCUSSION...
THUNDERSTORMS ON THE INCREASE OVER ARIZONA AND FAR EASTERN SOUTHERN
CALIFORNIA THIS AFTERNOON. THIS A RELECTION OF STRONG VERTICAL
LIFTING AHEAD OF THE DEEPENING TROUGH DIGGING SOUTHWARD OVER THE FAR
WESTERN STATES. ALL MODELS PREDICT SOME SIGNIFICANT RAINFALL AMOUNTS
OVER THE NEXT 24 TO 36 HOURS. THE HEAVIEST RAINFALL IS FORECAST TO
OCCUR AFTER MIDNIGHT IN OUR CWA...ALTHOUGH THE POSSIBILITY OF SOME
HEAVY RAIN WITH THUNDERSTORMS THE REMAINDER OF THIS AFTERNOON IS
THERE. THE MAIN PROBLEM WITH THUNDERSTORMS THIS AFTERNOON HAS BEEN
THE HAIL.

THE LOW IS FORECAST TO START LIFTING NORTHWARD OVER WESTERN ARIZONA
ON MONDAY...BEFORE PUSHING EASTWARD TUESDAY. SHOWERS SHOULD DIMINISH
EASTERN PORTION OF OUR CWA EARLY TUESDAY...WITH PARTLY CLOUDY
CONDITIONS ELSEWHERE. BY MIDWEEK...HIGHER PRESSURE SHOULD BRING SOME
DRYING...ALTHOUGH MEDIUM RANGE MODELS DIG ANOTHER TROUGH SOUTHWARD
BY THURSDAY. WILL LUMP WEDNESDAY AND THURSDAY TOGETHER...ALTHOUGH
WILL HAVE TO WAIT AND SEE WHAT LATER MODELS. BERKOVITZ

Nearby

Severe Thunderstorm Warnings in Arizona, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.