Alert archive / Arizona / Tornado Warnings in 1999
Tornado Warning 1, NWS Phoenix, AZ
NWS Phoenix, AZ issued this tornado warning at Jul 6, 1999, 3:21 PM MST for Pinal County, Arizona. It was in force for 34 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 6, 1999, 3:21 PM MST (22:21 UTC)
- Expired
- Jul 6, 1999, 3:55 PM MST
- In force
- 34 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Pinal County, AZ
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 6, 1:15 PM MST | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 10.4 hours before the alert went out and 82 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
- 236 J/kg
- Mixed-layer CIN
- -208 J/kg
- Mixed-layer LCL
- 2182 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHX 062223 RRA TORPHX AZC021-062255- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 321 PM MST TUE JUL 6 1999 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL PINAL COUNTY IN CENTRAL ARIZONA * UNTIL 355 PM MST * AT 315 PM... SPOTTERS INDICATED A TORNADO NEAR FLORENCE JUNCTION... MOVING WEST AT 20 MPH. THE TORNADO WILL MOVE WEST TOWARD GOLD CANYON A TORNADO IS ON THE G\ROUND! GO TO THE BASEMENT! IF A BASEMENT IS NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! HV &
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jul 6, 2:50 PM MST, 31 minutes earlier.
Area forecast discussion, Jul 6, 2:50 PM MST, 31 minutes before
SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 250 PM MST TUE JUL 6 1999 .SYNOPSIS... HIGH PRESSURE ALOFT WILL REMAIN OVER THE COLORADO AND 4 CORNERS AREA THROUGH THIS WEEK. THIS WILL KEEP A MOIST SOUTHEAST TO EASTERLY FLOW OVER THE REGION WHICH WILL SPREAD THE MOISTURE WESTWARD. AS A RESULT SKIES WILL REMAIN PARTLY CLOUDY OVER THE REGION WITH SCATTERED AFTERNOON AND EVENING THUNDERSTORMS IN SOUTH CENTRAL ARIZONA BECOMING ISOLATED IN SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. .DISCUSSION... MODELS KEEP UPPER HIGH OVER COLORADO / 4 CORNERS AREA FOR NEXT FEW DAYS. THIS KEEPS MOIST SOUTHEAST TO EAST FLOW OVER REGION. SATELLITE PHOTOS SHOW THAT MOISTURE HAS ALREADY SPREAD INTO SW AZ AND PORTIONS OF SE CA TODAY. IN ADDITION...A 4,000 FT. DEEP GULF SURGE OCCURRED INT0 YUMA TODAY. MODELS SHOW COUPLE VORMAXS OVER THE NORTHERN GULF WHICH MODELS TAKE A PIECE OF AND ROTATE INTO THE JOSHUA TREE AREA TONIGHT/WEDNESDAY WITH SOME PVA EXTENDING UP INTO SW/SOUTH CENTRAL AZ. THIS SHOULD HELP TO DEVELOP A THUNDERSTORMS TONIGHT OVER CENTRAL DESERTS AND POSSIBLY ISOLATED IN SW AZ/SE CA AREA. ALTHOUGH AIRMASS STILL NOT THAT UNSTABLE OVER THE WESTERN...BUT UNSTABLE OVER THE EAST PORTION OF CWA. SOME THUNDERSTORMS POSSIBLY SEVERE OVER SOUTHEAST AZ AND CENTRAL DESERTS UNTIL 03Z TONIGHT. OTHERWISE...SCATTERED AFTERNOON/ EVENING THUNDERSTORMS SOUTH CENTRAL AZ NEXT FEW DAYS AND ISOLATED IN WESTERN CWA ESPECIALLY WEDNESDAY/THURSDAY. THUNDERSTORMS OVER SOUTH CENTRAL AZ WILL BE PROPAGATING WESTWARD INTO THE CENTRAL DESERTS WITH THE EASTERLY FLOW ALOFT. 12Z PHX SOUNDING REMAINS AN INVERTED V FOR GUSTY WINDS WITH THE STORMS. MRF EXTENDED KEEP UPPER HIGH NORTH OF REGION FOR CONTINUED MOIST EASTERLY FLOW FOR LITTLE CHANGE IN CURRENT PATTERN. UK MODEL HOWEVER SHIFTS HIGH CENTER TO VICINITY LAS BY WEEKEND WHICH...IF IT OCCURS...WOULD BRING STORMS DOWN OFF RIM INTO CENTRAL DESERTS RATHER THAN FROM THE EAST. SEE SEL7 FOR SEVERE THUNDERSTORM WATCH BOX. DKS
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 2:00 PM MST | Severe Thunderstorm Warning | PSR | Gila | 60 min |
| Jul 6, 3:10 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 65 min |
| Jul 6, 3:16 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 64 min |
| Jul 6, 4:09 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 91 min |
Nearby
Tornado Warnings in Arizona, 1999Every tornado warning in 1999Tornadoes 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.