Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 94, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 13, 1999, 2:32 PM MST for Cochise County, Arizona. It was in force for 43 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
- Sep 13, 1999, 2:32 PM MST (21:32 UTC)
- Expired
- Sep 13, 1999, 3:15 PM MST
- In force
- 43 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Cochise County, AZ
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 9.5 hours before the alert went out and 113 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
- 20 J/kg
- Mixed-layer CIN
- -391 J/kg
- Mixed-layer LCL
- 2757 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 36 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 Sep 13, 2:30 PM MST, 2 minutes earlier.
Area forecast discussion, Sep 13, 2:30 PM MST, 2 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST MON SEP 13 1999 SYNOPSIS...A WEAK BOUNDARY FROM NEW MEXICO COMBINED WITH A SOUTHERLY MOISTURE SOURCE WILL CONTINUE A CHANCE OF THUNDERSTORMS THROUGH MID WEEK. THIS COULD ALSO BE ENHANCED BY AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE GREAT BASIN BY WEDNESDAY. AS IT MOVES OUT OF THE STATE BY THE END OF THE WEEK...WE SHOULD SEE SOME DRYING FROM THE WEST. DISCUSSION...LOTS OF THINGS GOING ON...SOME KIND OF BACK-DOOR DISTURBANCE NOW WEST OF DEMING AND GETTING CLOSE TO OUR CWA. CONTINUED LOW LEVEL MOISTURE SOURCE AND TROUGH MOVING INTO THE GREAT BASIN BY WEDNESDAY. PRECIPITABLE WATER TREND BACK UP OVER AN INCH ALL AREAS. COULD BE QUITE INTERESTING THE NEXT 24 TO 36 HOURS OR SO. ALSO...NO HURRY TO END THE MONSOON IN THE EXTENDED AS WELL BE THE LAST TO CLING TO MOISTURE IN THE FACE OF INCREASING WESTERLY FLOW. MEYER .TWC...NONE.
In the hours before
Special weather statement, Sep 13, 12:45 PM MST, 1 hour 47 minutes before
AZZ019-029>035-140500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST MON SEP 13 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 15 30 0 SE 8
GRAHAM 30 15 30 0 S 8
GREENLEE 35 10 30 0 S 8
TUCSON/ERN PIMA 25 15 30 0 SE 8
TOHONO OODHAM 20 5 30 0 SE 8
SOUTHEAST PINAL 20 10 25 0 SE 8
WESTERN PIMA 10 0 30 0 SE 10
SANTA CRUZ 25 15 30 0 SE 8
SYNOPSIS...SUFFICIENT MOISTURE WITH ADDITIONAL HEATING AND
INFLUENCE FROM BACK-DOOR FRONT MOVING IN FROM NEW MEXICO TO
PROVIDE BETTER FOCUS THE NEXT 24 HOURS. SEVERE THUNDERSTORMS A
CONCERN.
*****************************************************************
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/Special weather statement, Sep 13, 12:45 PM MST, 1 hour 47 minutes before
AZZ019-029>035-140500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST MON SEP 13 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 15 30 0 SE 8
GRAHAM 30 15 30 0 S 8
GREENLEE 35 10 30 0 S 8
TUCSON/ERN PIMA 25 15 30 0 SE 8
TOHONO OODHAM 20 5 30 0 SE 8
SOUTHEAST PINAL 20 10 25 0 SE 8
WESTERN PIMA 10 0 30 0 SE 10
SANTA CRUZ 25 15 30 0 SE 8
SYNOPSIS...SUFFICIENT MOISTURE WITH ADDITIONAL HEATING AND
INFLUENCE FROM BACK-DOOR FRONT MOVING IN FROM NEW MEXICO TO
PROVIDE BETTER FOCUS THE NEXT 24 HOURS. SEVERE THUNDERSTORMS A
CONCERN.
*****************************************************************
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/The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 1:04 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Sep 13, 2:42 PM MST | Flash Flood Warning | TWC | Cochise | 2 hr |
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.