Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 99, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Sep 15, 1999, 3:17 PM MST for Pima County, Arizona. It was in force for 38 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 15, 1999, 3:17 PM MST (22:17 UTC)
- Expired
- Sep 15, 1999, 3:55 PM MST
- In force
- 38 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 22:16 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 15, 12:30 PM MST | Severe Thunderstorm Watch | SPC | 6 hr |
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 15, 2:10 PM MST, 1 hour 7 minutes earlier.
Area forecast discussion, Sep 15, 2:10 PM MST, 1 hour 7 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 210 PM MST WED SEP 15 1999 SYNOPSIS...SUFFICIENT MOISTURE...HEATING AND INSTABILITY WILL CONTINUE THE THREAT FOR MAINLY AFTERNOON AND EVENING THUNDERSTORMS THROUGH THURSDAY. SOME OF THESE STORMS ARE EXPECTED TO BE QUITE STRONG. DRIER AIR BEGINNING TO MOVE INTO WESTERN PIMA COUNTY WILL SLOWLY WORK ITS WAY EAST THROUGH THE REST OF THE WEEK. EVEN SO...THERE WILL STILL LIKELY BE ENOUGH MOISTURE AROUND THIS WEEKEND FOR A CHANCE OF THUNDERSTORMS OVER THE EASTERN MOUNTAINS. DISCUSSION...STRONG SHEAR PROFILE THIS AFTERNOON FOR WIDESPREAD SEVERE CONVECTION. FOCUS HAS SHIFTED SOUTH AND EAST TO INCLUDE MOST OF THE CWA INCLUDING METRO TUCSON. MAIN ENERGY FROM TROUGH PULLING OUT OF THE GREAT BASIN THE NEXT 24 HRS...BUT A PIECE TRAILS A BIT IN EASTERN ARIZONA AS WELL AS A WEAK IMPULSE CAUGHT IN THE WESTERLIES DOWN AROUND THIS LATITUDE TO HELP FOCUS THINGS. A RELATIVELY WEAK SUBSIDENCE INVERSION SMASHED TO SMITHEREENS WITH BARELY A BACKWARD GLANCE. BRISK WESTERLY FLOW...BUT IMMEDIATE UPSTREAM OF THAT FOR OUR AREA STILL CONTAINS 1 INCH PRECIPITABLE WATER VALUES. WELL START TO SEE SOME DRYING IN THE FAR WEST...BUT NOT MUCH OF THAT INFLUENCING THINGS AROUND HERE THE NEXT COUPLE OF DAYS WITH WEAK SOUTHERLY COMPONENT TO FLOW RETURNING IN EASTERN PORTIONS AS SHORTWAVE RIDGING PUSHES UP OUT OF OLD MEXICO. MEYER .TWC...NONE.
In the hours before
Special weather statement, Sep 15, 12:05 PM MST, 3 hours 12 minutes before
AZZ019-029-030-032-033-035-160100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 1205 PM MST WED SEP 15 1999 ...SEVERE THUNDERSTORM WATCH UNTIL 6 PM MST FOR PORTIONS OF SOUTHEAST ARIZONA... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 6 PM FOR SOUTHEAST PINAL...GRAHAM...GREENLEE...CENTRAL PIMA...EASTERN PIMA AND NORTHERN COCHISE COUNTIES. THIS INCLUDES LOCATIONS SUCH AS METROPOLITAN TUCSON...SELLS...GREEN VALLEY...ORACLE...SAFFORD...CLIFTON... BENSON...AND WILLCOX. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. THIS INCLUDES DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. IN ADDITION AREA OF BLOWING DUST ARE POSSIBLE AWAY FROM STORMS AND LOCALLY HEAVY RAINFALL WILL BE EXPERIENCED WITH STORMS. MEYER
Special weather statement, Sep 15, 12:05 PM MST, 3 hours 12 minutes before
AZZ019-029-030-032-033-035-160100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 1205 PM MST WED SEP 15 1999 ...SEVERE THUNDERSTORM WATCH UNTIL 6 PM MST FOR PORTIONS OF SOUTHEAST ARIZONA... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 6 PM FOR SOUTHEAST PINAL...GRAHAM...GREENLEE...CENTRAL PIMA...EASTERN PIMA AND NORTHERN COCHISE COUNTIES. THIS INCLUDES LOCATIONS SUCH AS METROPOLITAN TUCSON...SELLS...GREEN VALLEY...ORACLE...SAFFORD...CLIFTON... BENSON...AND WILLCOX. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. THIS INCLUDES DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. IN ADDITION AREA OF BLOWING DUST ARE POSSIBLE AWAY FROM STORMS AND LOCALLY HEAVY RAINFALL WILL BE EXPERIENCED WITH STORMS. MEYER
Special weather statement, Sep 15, 12:45 PM MST, 2 hours 32 minutes before
AZZ019-029>035-160500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST WED SEP 15 1999...THIS PRODUCT IS NOT UPDATED
...SEVERE THUNDERSTORM WATCH UNTIL 6 PM MST FOR SOUTHEAST PINAL...
CENTRAL PIMA...EASTERN PIMA...GRAHAM...GREENLEE...AND NORTHERN
COCHISE COUNTIES...
*CONDITIONAL* *CONDITIONAL*
COUNTY AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 40 20 35 5 E 15
GRAHAM 50 30 45 5 E 20
GREENLEE 65 30 45 5 E 20
TUCSON/ERN PIMA 40 25 45 5 E 15
TOHONO OODHAM 35 20 45 5 E 12
SOUTHEAST PINAL 40 25 45 5 E 15
WESTERN PIMA 20 5 45 5 ESE10
SANTA CRUZ 40 10 45 5 ESE10
SYNOPSIS...MOIST AND VERY UNSTABLE THIS AFTERNOON. WIND SHEAR
PROFILE INDICATES STRONG SEVERE WEATHER SIGNATURES. FAST MOVING
SO FLOODING IS NOT A BIG CONCERN. EASTERN AREAS COULD SEE
ACTIVITY SUSTAINED WELL INTO THE EVENING.
*****************************************************************
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 15, 12:45 PM MST, 2 hours 32 minutes before
AZZ019-029>035-160500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST WED SEP 15 1999...THIS PRODUCT IS NOT UPDATED
...SEVERE THUNDERSTORM WATCH UNTIL 6 PM MST FOR SOUTHEAST PINAL...
CENTRAL PIMA...EASTERN PIMA...GRAHAM...GREENLEE...AND NORTHERN
COCHISE COUNTIES...
*CONDITIONAL* *CONDITIONAL*
COUNTY AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 40 20 35 5 E 15
GRAHAM 50 30 45 5 E 20
GREENLEE 65 30 45 5 E 20
TUCSON/ERN PIMA 40 25 45 5 E 15
TOHONO OODHAM 35 20 45 5 E 12
SOUTHEAST PINAL 40 25 45 5 E 15
WESTERN PIMA 20 5 45 5 ESE10
SANTA CRUZ 40 10 45 5 ESE10
SYNOPSIS...MOIST AND VERY UNSTABLE THIS AFTERNOON. WIND SHEAR
PROFILE INDICATES STRONG SEVERE WEATHER SIGNATURES. FAST MOVING
SO FLOODING IS NOT A BIG CONCERN. EASTERN AREAS COULD SEE
ACTIVITY SUSTAINED WELL INTO THE EVENING.
*****************************************************************
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 15, 12:45 PM MST | Severe Thunderstorm Warning | TWC | Graham, Greenlee | 55 min |
| Sep 15, 1:28 PM MST | Severe Thunderstorm Warning | TWC | Pima | 77 min |
| Sep 15, 1:41 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 49 min |
| Sep 15, 4:25 PM MST | Severe Thunderstorm Warning | TWC | Graham | 35 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; radar from the NEXRAD Level II archive.