Alert archive / Arizona / Tornado Warnings in 1999
Tornado Warning 1, NWS Tucson, AZ
NWS Tucson, AZ issued this tornado warning at Jul 7, 1999, 4:14 PM MST for Pima County, Arizona. It was in force for 36 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 7, 1999, 4:14 PM MST (23:14 UTC)
- Expired
- Jul 7, 1999, 4:50 PM MST
- In force
- 36 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pima County, AZ
The radar
The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 23:17 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
Tuscon, AZ (KTUS), launched 12:00Z, 11.2 hours before the alert went out and 84 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
- 17 J/kg
- Mixed-layer CIN
- -196 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 50 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 KTUS 072313 RRA TORTUS AZC019-072350- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TUCSON AZ 414 PM MST WED JUL 7 1999 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * TORNADO WARNINGX FOR... EASTERN PIMA COUNTY IN SOUTHERN ARIZONA TUCSON...ORO VALLEY AND MARANA * UNTIL 450 PM MST * AT 413 PM MST... DOPPLER RADAR INDICATED A TORNADO 10 MILES NORTHWEST OF TUCSON... MOVING NORTHWEST AT 10 MPH. ZELL
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 Tucson, AZ wrote its last area forecast discussion before this tornado warning went out at Jul 7, 2:20 PM MST, 1 hour 54 minutes earlier.
Area forecast discussion, Jul 7, 2:20 PM MST, 1 hour 54 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 220 PM MST WED JUL 7 1999 SYNOPSIS...HIGH PRESSURE ALOFT NEAR THE FOUR CORNERS AREA WILL KEEP SOUTHERN ARIZONA IN A VERY MOIST MONSOON FLOW. SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS...SOME WITH HEAVY RAINFALL AND STRONG WINDS...ARE LIKELY THROUGH MOST OF THE WEEK. DISCUSSION...SOME STABILITY TO THE ATMOSPHERE TODAY (BOTH A LITTLE MID LEVEL SUBSIDENCE AND LOWER LEVEL COOLING) DELAYED DEVELOPMENT...BUT ONLY A COUPLE HOURS. SCATTERED STORMS WITH HEAVY RAIN WILL ARE NO PROBLEM. THE REALY QUESTION FOR THE NEXT 12 HRS IS THE POSSIBLITY OF ANOTHER EASTERLY IMPULSE PUSHING IN FROM NORTHERN MEXICO AND ORGANIZING CONVECTION OVERNIGHT. THE AREA IM LOOKING AT IS IN CHIHUAHUA...WHICH IS STILL IN THE EARLY STAGES OF GETTING ITS ACT TOGETHER. STILL UNCERTAIN ABOUT ITS STRENGTH...BUT RIGHT NOW ID SAY ITS GOING TO BE A BUSY NIGHT. COMBINE THAT WITH A BIT LESS ACTIVITY THIS AFTERNOON...AND WE SHOULD BE PRIMED AND READY FOR IT TO COME THROUGH TONIGHT. TIMING WISE...MAYBE STARTING IN COCHISE COUNTY BY 9 PM AND IN THE TUCSON AREA SOMEWHERE AROUND 10 PM TO MIDNIGHT. FLASH FLOODING A CONCERN WITH ANYTHING NOW...A WATCH WILL BE CONSIDERED. STRONG MONSOON UNTIL FURTHER NOTICE. MEYER .TWC...NONE.
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 1:57 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 33 min |
| Jul 7, 2:10 PM MST | Flash Flood Warning | TWC | Santa Cruz | 110 min |
| Jul 7, 2:58 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 32 min |
| Jul 7, 3:43 PM MST | Severe Thunderstorm Warning | TWC | Pima | 47 min |
| Jul 7, 4:12 PM MST | Flash Flood Warning | TWC | Pima | 63 min |
| Jul 7, 4:33 PM MST | Flash Flood Warning | TWC | Pima | 47 min |
| Jul 7, 4:33 PM MST | Severe Thunderstorm Warning | TWC | Pima | 47 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; radar from the NEXRAD Level II archive.