Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 67, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 13, 1998, 6:14 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
- Aug 13, 1998, 6:14 PM MST (01:14 UTC)
- Expired
- Aug 13, 1998, 6:50 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 01:14 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 |
|---|---|---|---|
| Aug 13, 3:00 PM MST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 1.2 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
- 546 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 2417 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
853 WUUS1 KTUS 140116 RRA SVRTUS AZC019-140150- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 614 PM MST THU AUG 13 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 650 PM MST * AT 612 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 15 MILES SOUTHWEST OF SELLS NEAR THE ARIZONA-MEXICO BORDER. THIS SEVERE THUNDERSTORM IS OVER A REMOTE AREA OF THE SOUTHERN TOHONO OODHAM NATION AND IS MOVING SLOWLY TO THE SOUTHWEST JRG
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 Aug 13, 2:30 PM MST, 3 hours 44 minutes earlier.
Area forecast discussion, Aug 13, 2:30 PM MST, 3 hours 44 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST THU AUG 13 1998 SYNOPSIS...HIGH PRESSURE ALOFT OVER THE WESTERN GREAT BASIN WILL DRIFT SLOWLY EAST DURING THE REMAINDER OF THIS WEEK. AN EAST TO NORTHEAST WIND FLOW AROUND THIS HIGH PRESSURE SYSTEM WILL ALLOW MONSOONAL MOISTURE AND THUNDERSTORMS TO PERSIST OVER SOUTHEAST ARIZONA INTO THE UPCOMING WEEKEND. DISCUSSION...THUNDERSTORM ACTIVITY BEGAN RATHER EARLY TODAY...BEFORE NOON. EXPECTED TO SEE MORE ACTIVITY OVER THE FAR EASTERN RIM AREA THAN SHOWING UP ON SATELLITE AT THIS TIME. WITH INVERTED V SOUNDING SEVERE WIND GUSTS POSSIBLE TONIGHT. SEE NO MECHANISM THROUGH 48 HOURS TO DECREASE MOISTURE ALREADY PRESENT. UPPER LEVEL HIGH PRESSURE REMAINS CENTERED NORTH OF TUCSON FOR EAST TO NORTHEAST STEERING FLOW. THIS IS FAVORABLE FOR STORMS MOVING OFF THE RIM COUNTRY AND INTO THE VALLEYS. TUS 534. .TWC...SEVERE THUNDERSTORM WATCH 3 PM TO 9 PM.
In the hours before
Special weather statement, Aug 13, 12:45 PM MST, 5 hours 29 minutes before
AZZ019-029>035-140800-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU AUG 13 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 40 30 60 40 SW 10
GRAHAM 50 40 60 40 SW 10
GREENLEE 50 40 60 45 SW 10
TUCSON/ERN PIMA 30 30 40 20 SW 10
TOHONO O'ODHAM 20 20 30 20 SW 10
WESTERN PIMA 20 20 30 20 SW 10
SOUTHEAST PINAL 20 30 30 20 SW 10
SANTA CRUZ 30 30 40 30 SW 10
SYNOPSIS...THE ATMOSPHERE ACROSS ALL OF SOUTHEAST ARIZONA IS MORE
UNSTABLE THAN YESTERDAY. AN UPPER LEVEL TROUGH OVER NORTHEAST
ARIZONA MAY ENHANCE THUNDERSTORM ACTIVITY OVER GRAHAM AND GREENLEE
COUNTIES. NORTH TO NORTHEAST WINDS WILL LIKELY PUSH THUNDERSTORMS
OFF THE MOGOLLON RIM INTO VALLEY LOCATIONS...THIS MAY ALLOW
THUNDERSTORMS TO CONTINUE INTO THE LATE NIGHT. BOTH SEVERE WIND
GUSTS AND FLASH FLOODING ARE POSSIBLE TODAY AND TONIGHT.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS 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, Aug 13, 12:45 PM MST, 5 hours 29 minutes before
AZZ019-029>035-140800-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU AUG 13 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 40 30 60 40 SW 10
GRAHAM 50 40 60 40 SW 10
GREENLEE 50 40 60 45 SW 10
TUCSON/ERN PIMA 30 30 40 20 SW 10
TOHONO O'ODHAM 20 20 30 20 SW 10
WESTERN PIMA 20 20 30 20 SW 10
SOUTHEAST PINAL 20 30 30 20 SW 10
SANTA CRUZ 30 30 40 30 SW 10
SYNOPSIS...THE ATMOSPHERE ACROSS ALL OF SOUTHEAST ARIZONA IS MORE
UNSTABLE THAN YESTERDAY. AN UPPER LEVEL TROUGH OVER NORTHEAST
ARIZONA MAY ENHANCE THUNDERSTORM ACTIVITY OVER GRAHAM AND GREENLEE
COUNTIES. NORTH TO NORTHEAST WINDS WILL LIKELY PUSH THUNDERSTORMS
OFF THE MOGOLLON RIM INTO VALLEY LOCATIONS...THIS MAY ALLOW
THUNDERSTORMS TO CONTINUE INTO THE LATE NIGHT. BOTH SEVERE WIND
GUSTS AND FLASH FLOODING ARE POSSIBLE TODAY AND TONIGHT.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS 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 |
|---|---|---|---|---|
| Aug 13, 9:01 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 49 min |
| Aug 14, 12:15 AM MST | Flash Flood Warning | TWC | Pima | 2 hr |
| Aug 14, 4:00 PM MST | Severe Thunderstorm Warning | TWC | Pima, Pinal | 45 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1998Every severe thunderstorm warning in 1998
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.