Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 57, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 9, 1998, 3:41 PM MST for Pinal County, Arizona. It was in force for 49 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 9, 1998, 3:41 PM MST (22:41 UTC)
- Expired
- Aug 9, 1998, 4:30 PM MST
- In force
- 49 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pinal County, AZ
The nearest sounding before it
Phoenix, AZ (KPHX), launched 12:00Z, 10.7 hours before the alert went out and 82 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
- 351 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 1942 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
379 WUUS1 KTUS 092242 RRA SVRTUS AZC021-092330- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 341 PM MST SUN AUG 9 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PINAL COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 430 PM MST * AT 340 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES NORTH OF MAMMOTH ALONG STATE HIGHWAY 77 MOVING WEST AT 15 MPH. JD
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 9, 2:30 PM MST, 1 hour 11 minutes earlier.
Area forecast discussion, Aug 9, 2:30 PM MST, 1 hour 11 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST SUN AUG 9 1998 SYNOPSIS...THUNDERSTORM ACTIVITY WILL INCREASE THE NEXT FEW DAYS AS MOISYURE FROM FORMER TROPICAL STORM FRANK MOVES INTO ARIZONA. DISCUSSION...STORMS DEVELOPING IN MTNS THAT CLEARED FIRST. LUKS LIKE WE HAVE TWO CHANCES OF GETTING PRECIP. FIRST WILL BE WITH STORMS DEVELOPING LOCALLY THIS AFTN. SECOND WILL BE IF COMPLEX DEVELOPS DOWN IN MEX TONIGHT AND MOVES NORTHWARD. POTENTIAL IS ABOUT THE SAME WITH EITHER SCENARIO. ALMOST TROPICAL AIRMASS SO SEVERE THREAT MINIMAL BUT HEAVY PRECIP THREAT STILL THERE. HAVE DECIDED TO HOLD OFF ON ANY WATCHES IN CWA...JUST NEED TO HAVE MORE CONFIDENCE IN HOW T HIS IS GOING TO PLAY OUT. TREND SHOULD BE DECREAING THROUGH TUE BUT STILL IN A WET PERIOD FOR THE WEEK. TUS 5444. HOLBROOK .TWC...NONE.
In the hours before
Special weather statement, Aug 9, 12:45 PM MST, 2 hours 56 minutes before
AZZ019-029>035-100700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SUN AUG 9 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 10 10 5 NW 10
GRAHAM 30 10 10 5 N 10
GREENLEE 50 10 15 10 N 10
TUCSON/ERN PIMA 50 5 30 20 NW 15
TOHONO OODHAM 60 5 60 20 NW 15
WESTERN PIMA 70 5 80 30 NW 20
SOUTHEAST PINAL 50 5 30 15 NW 15
SANTA CRUZ 60 5 45 20 NW 15
SYNOPSIS...MOISTURE FROM FORMER TROPICAL STORM FRANK WILL MOVE INTO
SOUTHERN ARIZONA TODAY. THUNDERSTORMS WILL BE NUMEROUS WEST TO
SCATTERED FAR EAST. SEVERE THREAT DIMINISHED DUE TO TROPICAL
CHARACTERISTICS OF ATMOSPHERE.
*****************************************************************
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/VPHSpecial weather statement, Aug 9, 12:45 PM MST, 2 hours 56 minutes before
AZZ019-029>035-100700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST SUN AUG 9 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 10 10 5 NW 10
GRAHAM 30 10 10 5 N 10
GREENLEE 50 10 15 10 N 10
TUCSON/ERN PIMA 50 5 30 20 NW 15
TOHONO OODHAM 60 5 60 20 NW 15
WESTERN PIMA 70 5 80 30 NW 20
SOUTHEAST PINAL 50 5 30 15 NW 15
SANTA CRUZ 60 5 45 20 NW 15
SYNOPSIS...MOISTURE FROM FORMER TROPICAL STORM FRANK WILL MOVE INTO
SOUTHERN ARIZONA TODAY. THUNDERSTORMS WILL BE NUMEROUS WEST TO
SCATTERED FAR EAST. SEVERE THREAT DIMINISHED DUE TO TROPICAL
CHARACTERISTICS OF ATMOSPHERE.
*****************************************************************
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/VPHNearby
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.