Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 21, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 14, 1999, 5:14 PM MST for Pinal County, Arizona. It was in force for 61 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 14, 1999, 5:14 PM MST (00:14 UTC)
- Expired
- Jul 14, 1999, 6:15 PM MST
- In force
- 61 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Pinal County, AZ
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.2 hours before the alert went out and 92 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
- 8 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 2929 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 12 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 150014 RRA SVRPHX AZC021-150115- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 514 PM MST WED JUL 14 1999 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN AND NORTH CENTRAL PINAL COUNTY IN CENTRAL ARIZONA * UNTIL 615 PM MST * AT 510 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 10 MILES WEST OF CASA GRANDE..r. MOVING EAST NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CASA GRANDE COOLIDGE FLORENCE DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! CRAIG ELLIS
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 Jul 14, 2:45 PM MST, 2 hours 29 minutes earlier.
Area forecast discussion, Jul 14, 2:45 PM MST, 2 hours 29 minutes before
SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST WED JUL 14 1999 .SYNOPSIS... A MOIST AIRMASS IS MOVING SLOWLY EAST ACROSS SOUTH CENTRAL AZ TONIGHT. A BROAD TROUGH OF LOW PRESSURE MOVES TO THE EAST TONIGHT TRIGGERING SCATTERED THUNDERSTORMS WITH HEAVY RAINFALL IN SOUTH CENTRAL AZ. A SOUTHWEST FLOW ALOFT ON THURSDAY WILL BRING SLIGHTLY DRIER AIR INTO THE SOUTHWEST AND SOUTH CENTRAL AREA. CHANCE OF AFTERNOON THUNDERTORMS CONTINUES MAINLY TO THE EAST ON FRIDAY AND INTO THE WEEKEND. .DISCUSSION... DEEP CONVECTION OVER SOUTH CENTRAL MIDDAY TODAY HAS TEMPORAIRLY DIMINISHIED THUNDERTORMS LATE THIS AFTERNOON. HOWEVER THE STRONG THUNDERSTORMS SHOULD RETURN THIS EVENING...TRIGGERING ON THE OLD OUTFLOW BOUNDAIRIES FROM THE PREVIOUS STORMS...A MOVE NORTHEAST ACROSS THE SAME AREAS THAT HAD RAINS EARLIER TODAY. THE SUBTLE AXIS OF A BROAD TROUGH ALOFT SHOULD SWING TO THE EAST OF SOUTH CENTRAL AZ BY 06Z TONIGHT. AFTER THE AXIS PASSAGE CNVCTV ACTIVITY SHOULD DMSH. A WEAK RDIGE FOLLOWS...INTO OUR AREA ON THURSDAY...THEN A E PAC TROUGH DEEPENS SW OF SRN CA...ON FRIDAY BRINGING A BETTER DEFINED SOUTHWEST FLOW INTO THE AREA. THE E PAC TROUGH SHD BE THE DOMINATE FEATURE THOUGH THE WEEKEND. PERHAPS HEARLDING A SLIGHTLY DRIER CLIME IN THE SOUTHWEST REGION OF OUR AREA GOING INTO EARLY NEXT WEEK. IN THE MEANTIME...A FLASH FLOOD WATCH WILL BE IN EFFECT UNTIL 11 PM MST FOR CENTRAL AZ...MARICOPA...SOUTHERN GILA...AND NORTHWEST PINAL COUNTY.
Nearby
Severe Thunderstorm Warnings in Arizona, 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.