Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 55, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 7, 1998, 5:35 PM MST for Pima County, Arizona. It was in force for 45 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 7, 1998, 5:35 PM MST (00:35 UTC)
- Expired
- Aug 7, 1998, 6:20 PM MST
- In force
- 45 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 00:36 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, 0.6 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
- 347 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 3195 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
243 WUUS1 KTUS 080037 RRA SVRTUS AZC019-080120- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 535 PM MST FRI AUG 7 1998 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL PIMA COUNTY IN SOUTHERN ARIZONA * UNTIL 620 PM MST * AT 535 PM MST...DOPPLER RADAR SHOWED A SEVERE THUNDERSTORM 10 MILES EAST OF THREE POINTS AND 5 MILES SOUTHEAST OF RYAN FIELD MOVING WEST AT 15 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING WIND GUST TO 65 MPH AND HEAVY RAIN. * THIS SEVERE THUNDERSTORM WILL AFFECT... RYAN FIELD BY 545 PM MCCOLLUM
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 7, 2:30 PM MST, 3 hours 5 minutes earlier.
Area forecast discussion, Aug 7, 2:30 PM MST, 3 hours 5 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST FRI AUG 7 1998 SYNOPSIS...THUNDERSTORM ACTIVITY WILL BE ON THE INCREASE THOUGH THE WEEKEND AS MORE MOISTURE ENTERS THE STATE. DISCUSSION...TODAY LUKS VERY SIMILAR TO WED EXCEPT DONT THINK WE WILL SEE AS MUCH TRAINING ON THE MTNS. LUKS LIKE THING WILL GET ORGANIZED THIS AFTN AND THERE IS ENUF CAPE TO GET STORMS OFF MTNS INTO VALLEYS. COLD ALOFT SO HAIL IS A THREAT AND COULD SEE SOME HEAVY RAIN IN SPOTS BUT NOT EXPECTING A HEAVY RAIN EVENT. STILL HAVE LEFT WORDING BEEFED UP IN CASE MSTR GETS BETTER BY EVENING. ATTN THEN TURNS TO TROPICAL MSTR MOVG UP ASSOCD WITH THE DEPRESSION. MODELS PUSH THIS NWD OVR THE WEEKEND. SO HAVE BROUGHT TEMPS DOWN AND POPS UP. THIS COULD GET VERY WET IF MODELS MSTR FIELDS ARE CORRECT. FOR NOW JUST MONITORING. TUS 4344. HOLBROOK .TWC...NONE.
In the hours before
Special weather statement, Aug 7, 12:45 PM MST, 4 hours 50 minutes before
AZZ019-029>035-080700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU AUG 7 1998...THIS PRODUCT IS NOT UPDATED
...MODERATE RISK OF SEVERE WEATHER AND FLASH FLOODING ACROSS ALL
OF SOUTHEAST ARIZONA EXCEPT FOR GRAHAM AND GREENLEE COUNTIES...
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 20 10 15 5 W 10
GRAHAM 20 10 15 5 SW 10
GREENLEE 20 10 15 5 SW 10
TUCSON/ERN PIMA 40 25 50 20 W 10
TOHONO OODHAM 40 25 40 15 NW 10
WESTERN PIMA 40 20 40 15 NW 10
SOUTHEAST PINAL 40 20 40 15 W 10
SANTA CRUZ 50 30 50 25 W 10
SYNOPSIS...MOISTURE HAS MOVED BACK SOUTHERN ARIZONA FROM THE SOUTH
WHILE THE EASTERN THREE COUNTIES REMAIN RELATIVELY DRY. MID LEVEL
WINDS ARE FAVORABLE TO MOVE STORMS WESTWARD INTO DESERT AND HIGHER
LEVEL WINDS WILL PUSH ANVILS BACK TO THE EAST...ALSO A FAVORABLE
SCENARIO. SO WE ARE EXPECTING AN UPSWING IN THUNDERSTORM ACTIVITY
ACROSS THREE WESTERN ZONES.
*****************************************************************
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 7, 12:45 PM MST, 4 hours 50 minutes before
AZZ019-029>035-080700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU AUG 7 1998...THIS PRODUCT IS NOT UPDATED
...MODERATE RISK OF SEVERE WEATHER AND FLASH FLOODING ACROSS ALL
OF SOUTHEAST ARIZONA EXCEPT FOR GRAHAM AND GREENLEE COUNTIES...
*CONDITIONAL* *CONDITIONAL*
AREAL PROBABILITY RAIN GREATER THAN STORM
COUNTY COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 20 10 15 5 W 10
GRAHAM 20 10 15 5 SW 10
GREENLEE 20 10 15 5 SW 10
TUCSON/ERN PIMA 40 25 50 20 W 10
TOHONO OODHAM 40 25 40 15 NW 10
WESTERN PIMA 40 20 40 15 NW 10
SOUTHEAST PINAL 40 20 40 15 W 10
SANTA CRUZ 50 30 50 25 W 10
SYNOPSIS...MOISTURE HAS MOVED BACK SOUTHERN ARIZONA FROM THE SOUTH
WHILE THE EASTERN THREE COUNTIES REMAIN RELATIVELY DRY. MID LEVEL
WINDS ARE FAVORABLE TO MOVE STORMS WESTWARD INTO DESERT AND HIGHER
LEVEL WINDS WILL PUSH ANVILS BACK TO THE EAST...ALSO A FAVORABLE
SCENARIO. SO WE ARE EXPECTING AN UPSWING IN THUNDERSTORM ACTIVITY
ACROSS THREE WESTERN ZONES.
*****************************************************************
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/VPHThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 5:20 PM MST | Severe Thunderstorm Warning | TWC | Pima | 45 min |
| Aug 7, 6:06 PM MST | Severe Thunderstorm Warning | TWC | Pima | 44 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.