Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 45, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 25, 1999, 5:14 PM MST for Pinal County, Arizona. It was in force for 31 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 25, 1999, 5:14 PM MST (00:14 UTC)
- Expired
- Jul 25, 1999, 5:45 PM MST
- In force
- 31 min
- Issued by
- NWS Tucson, 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
- 129 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 2309 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 42 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 Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 2:30 PM MST, 2 hours 44 minutes earlier.
Area forecast discussion, Jul 25, 2:30 PM MST, 2 hours 44 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST SUN JUL 25 1999 SYNOPSIS...HIGH PRESSURE ALOFT WILL SHIFT WESTWARD FROM THE CENTRAL PLAINS TO NEAR THE 4 CORNERS AREA BY MONDAY. FAIRLY STRONG SOUTHERLY WINDS ALOFT OVER SOUTHEAST ARIZONA ARE FOCUSING STORMS IN A FEW LINES. THUNDERSTORM ACTIVITY THIS EVENING WILL LIKELY REMAIN FAIRLY CLOSE TO THE MOUNTAINS AND END FAIRLY RAPIDLY TOWARD SUNSET. AS EASTERLY WINDS INCREASE OVER THE AREA MONDAY AND TUESDAY EXPECT TO SEE INCREASING THUNDERSTORM ACTIVITY EACH DAY. DISCUSSION...MAIN THUNDERSTORM ACTIVITY FOCUSED IN A LINE FROM NORTHWEST TO SOUTHEAST ACROSS KITT PEAK. ISOLATED STORMS ELSEWHERE. MOST STORMS SEEM TO BE FOCUSED ALONG NARROW LOW LEVEL CONVERGENCE LINES. ONLY ISOLATED STORMS OUTSIDE THIS AREA. EXPECT ACTIVITY TO REMAIN FAIRLY CONSTANT AS TEMPERATURES HAVE PEAKED OUT. SHOULD BE QUICK END TO THE CONVECTION BY SUNSET. EXPECT SOME INCREASE IN ACTIVITY MONDAY BUT BIGGER INCREASE COMES TUESDAY WITH A LIKELY EASTERLY WAVE MOVING OVER AREA. ABOUT THE ONLY THING TO SAY ABOUT THE EXTENDED IS THAT MOISTURE REMAINS SO SCATTERED THUNDERSTORMS CONTINUE. PRF .TWC...NONE.
In the hours before
Special weather statement, Jul 25, 11:20 AM MST, 5 hours 54 minutes before
AZZ019-029>035-260500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1120 AM MST SUN JUL 25 1999...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
COUNTY AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 35 20 20 10 NNW12
GRAHAM 35 20 25 10 NNW12
GREENLEE 40 20 30 15 NNW12
TUCSON/ERN PIMA 30 30 25 10 NNW15
TOHONO O'ODHAM 25 35 20 10 N15
SOUTHEAST PINAL 25 35 25 10 N15
WESTERN PIMA 20 40 20 10 N15
SANTA CRUZ 35 20 35 15 NNW12
SYNOPSIS...THE ATMOPSPHERE IS JUST AS MOIST AND EVEN MORE
UNSTABLE THAN YESTERDAY. HOWEVER...LIKE YESTERDAY THERE IS NO
DISTURBANCE TO FOCUS DEVELOPMENT. WIND FIELDS ARE A LITTLE
STRONGER THAN YESTERDAY WHICH REDUCES THE THREAT OF HEAVY RAIN
BUT INCREASES THE CHANCE OF ISOLATED DAMAGING WIND GUSTS. THE
STRONGER WINDS ALOFT SHOULD CAUSE THUNDERSTORM ANVILS TO SPREAD
OUT AND SUPPRESS STORM COVERAGE IN THE VALLEYS SOMEWHAT. THE
STORMS WILL DISSIPATE QUICKLY AFTER SUNSET DUE TO THE LACK OF
ORGANIZATION.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT AN INDIVIDUAL STORM WILL
PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
ANY LOCATION
STORM MOTION - GENERAL DIRECTION TO WHICH THE STORMS WILL
LIKELY MOVE AND SPEED IN MPH
NOTE...
VALID TIME IS FROM 12:45 PM TO 12 MIDNIGHT OF THE DAY OF ISSUANCE.
THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES. CORRESPONDING GRAPHICS MAY BE FOUND ON THE NWS
TUCSON INTERNET PAGE AT
HTTP://NIMBO.WRH.NOAA.GOV/TUCSON/SWO/SWO.SHTML
END/PYTLAK
CORRECTED TO ADD STORM MOTIONThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 5:14 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 31 min |
| Jul 25, 5:39 PM MST | Flash Flood Warning | TWC | Cochise | 66 min |
| Jul 25, 5:51 PM MST | Flash Flood Warning | TWC | Cochise | 59 min |
| Jul 25, 6:38 PM MST | Flash Flood Warning | TWC | Cochise | 57 min |
| Jul 26, 1:26 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 49 min |
| Jul 26, 2:09 PM MST | Flash Flood Warning | TWC | Cochise | 3 hr |
| Jul 26, 2:46 PM MST | Flash Flood Warning | TWC | Pima | 74 min |
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.