Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 14, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 17, 1998, 6:25 PM MST for Pima County, Arizona. It was in force for 60 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 17, 1998, 6:25 PM MST (01:25 UTC)
- Expired
- Jul 17, 1998, 7:25 PM MST
- In force
- 60 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 01:25 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 nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 1.4 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
- 979 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 3214 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
456 WUUS1 KTUS 180126 RRA SVRTUS AZC019-180225- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 625 PM MST FRI JUL 17 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN AND CENTRAL PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 725 PM MST...THIS DOES NOT INCLUDE METROPOLITAN TUCSON * AT 625 PM MST... DOPPLER RADAR AND SPOTTER REPORTS INDICATED AN AREA OF SEVERE THUNDERSTORMS ALONG HIGHWAY 86 NEAR THREE POINTS AND RYAN FIELD. THIS AREA EXTENDED SOUTHWARD TO THE SIERRITA MOUNTAINS WEST OF GREEN VALLEY. STORM MOVEMENT WAS TO THE SOUTHWEST AT 15 TO 25 MPH. * THE SEVERE THUNDERSTORMS WILL BE NEAR... THREE POINTS BY 640 PM KITT PEAK BY 700 PM MEYER
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 17, 2:30 PM MST, 3 hours 55 minutes earlier.
Area forecast discussion, Jul 17, 2:30 PM MST, 3 hours 55 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST FRI JUL 17 1998 SYNOPSIS...AN EASTERLY AIRFLOW AROUND AN UPPER HIGH CENTERED OVER SOUTHERN NEVADA AND SOUTHWEST UTAH WILL CONTINUE TO INCREASE THE MOISTURE OVER SOUTHEAST ARIZONA FOR AN UPSWING IN THUNDERSTORM ACTIVITY THROUGH THE WEEKEND. DISCUSSION...THE AIR MASS IS A LITTLE MORE MOIST TODAY THAN YESTERDAY PER TUCSON SOUNDING THIS MORNING AND A LITTLE HIGHER SURFACE DEW POINTS. THIS MOISTENING TREND WILL CONTINUE NEXT 24 HOURS AS HIGHER MOISTURE VALUES RESIDING TO OUR EAST IN NEW MEXICO WILL BE ADVECTED INTO SOUTHEAST ARIZONA IN THE EASTERLY FLOW. MODIFIED SOUNDING SHOWS CAPE AROUND 1100J/KG THIS AFTERNOON WHICH IS A LITTLE HIGHER THAN YESTERDAY SO SHOULD SEE ANOTHER GOOD FIREWORKS SHOW THIS EVENING ON THE LOWER DESERTS AS OUTFLOWS FROM THE RIM COUNTRY PROPAGATE INTO THE LOWER DESERTS THIS EVENING AND INITIATE THUNDERSTORMS. MAIN CONCERN AGAIN WILL BE STRONG DOWNBURST WINDS DUE TO INVERTED V TYPE SOUNDING. ANOTHER THING THAT WILL HELP BEEF UP THUNDERSTORM ACTIVITY LATE THIS AFTERNOON AND EVENING IS A CYCLONIC CIRCULATION SEEN IN WATER VAPOR IMAGERY OVER WEST CENTRAL NEW MEXICO WHICH WILL ADD DYNAMICAL SUPPORT TO THUNDERSTORM FORMATION AS IT MOVES ACROSS SOUTHEAST ARIZONA THIS EVENING. SATURDAY AND SUNDAY WILL CONTINUE TO BE ACTIVE AS THIS EASTERLY FLOW CONTINUES. THIS SAME PATTERN CONTINUES THROUGH MIDWEEK. TUS 5343. COLLINS .TWC...NONE.
In the hours before
Special weather statement, Jul 17, 12:45 PM MST, 5 hours 40 minutes before
AZZ019-029>035-180700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST FRI JUL 17 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 50 25 50 10 SW 20
GRAHAM 55 30 50 10 SW 20
GREENLEE 65 25 50 10 SW 15
TUCSON/ERN PIMA 50 35 50 10 SW 20
TOHONO OODHAM 45 30 40 5 SW 20
WESTERN PIMA 30 30 30 0 SW 20
SOUTHEAST PINAL 45 40 45 10 SW 20
SANTA CRUZ 50 35 45 10 SW 20
SYNOPSIS...MOIST AND UNSTABLE. STORMS WILL FORM OVER HIGHER
TERRAIN...ESPECIALLY THE MOGOLLON RIM...AND MOVE DOWN INTO VALLEY
LOCATIONS WITH A STRONG NORTHEASTERLY FLOW ALOFT. DYNAMICS WILL
ENHANCE THUNDERSTORMS INTO THE EVENING HOURS WITH A MODERATE CHANCE
OF SEVERE THUNDERSTORMS ALONG WITH RAINFALL AMOUNTS AT 1 INCH NOT
UNCOMMON. STORMS MAY BE SUSTAINED INTO THE LATE EVENING.
*****************************************************************
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/CECSpecial weather statement, Jul 17, 12:45 PM MST, 5 hours 40 minutes before
AZZ019-029>035-180700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST FRI JUL 17 1998...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 50 25 50 10 SW 20
GRAHAM 55 30 50 10 SW 20
GREENLEE 65 25 50 10 SW 15
TUCSON/ERN PIMA 50 35 50 10 SW 20
TOHONO OODHAM 45 30 40 5 SW 20
WESTERN PIMA 30 30 30 0 SW 20
SOUTHEAST PINAL 45 40 45 10 SW 20
SANTA CRUZ 50 35 45 10 SW 20
SYNOPSIS...MOIST AND UNSTABLE. STORMS WILL FORM OVER HIGHER
TERRAIN...ESPECIALLY THE MOGOLLON RIM...AND MOVE DOWN INTO VALLEY
LOCATIONS WITH A STRONG NORTHEASTERLY FLOW ALOFT. DYNAMICS WILL
ENHANCE THUNDERSTORMS INTO THE EVENING HOURS WITH A MODERATE CHANCE
OF SEVERE THUNDERSTORMS ALONG WITH RAINFALL AMOUNTS AT 1 INCH NOT
UNCOMMON. STORMS MAY BE SUSTAINED INTO THE LATE EVENING.
*****************************************************************
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/CECLocal storm report, Jul 17, 6:10 PM MST, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
610 PM MST FRI JUL 17 1998
TIME(MST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
605 PM RYAN FIELD AZ WIND DAMAGE
07/17/98 PIMA 94 MPH WIND GUST
600 PM TUCSON AZ WIND DAMAGE
07/17/98 PIMA MOBILE HOME ROOF DESTROYEDThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:41 PM MST | Severe Thunderstorm Warning | TWC | Pima | 49 min |
| Jul 17, 7:25 PM MST | Severe Thunderstorm Warning | TWC | Pima | 45 min |
| Jul 17, 7:33 PM MST | Severe Thunderstorm Warning | TWC | Greenlee | 47 min |
| Jul 17, 8:09 PM MST | Severe Thunderstorm Warning | TWC | Pima | 61 min |
| Jul 17, 8:17 PM MST | Severe Thunderstorm Warning | TWC | Graham | 48 min |
| Jul 17, 11:14 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 46 min |
| Jul 18, 12:15 AM MST | Severe Thunderstorm Warning | TWC | Pima | 90 min |
| Jul 18, 1:44 AM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Jul 18, 1:37 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 48 min |
| Jul 18, 2:08 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 62 min |
| Jul 18, 2:44 PM MST | Severe Thunderstorm Warning | TWC | Pima | 46 min |
| Jul 18, 3:25 PM MST | Severe Thunderstorm Warning | TWC | Pima | 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.