Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 63, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 19, 1999, 4:40 PM MST for Cochise County, Santa Cruz County, Arizona. It was in force for 50 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 19, 1999, 4:40 PM MST (23:40 UTC)
- Expired
- Aug 19, 1999, 5:30 PM MST
- In force
- 50 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
Counties Cochise County, AZ, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 38 km from the middle of the area, began a volume at 23:43 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 12:00Z, 11.7 hours before the alert went out and 77 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2499 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 19, 2:00 PM MST, 2 hours 40 minutes earlier.
Area forecast discussion, Aug 19, 2:00 PM MST, 2 hours 40 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 200 PM MST THU AUG 19 1999 SYNOPSIS...HIGH PRESSURE ALOFT WILL SET UP NEAR THE FOUR CORNERS REGION THIS WEEKEND...RESULTING IN A FAVORABLE SOUTHEAST MONSOONAL WIND FLOW. DISTURBANCES WILL MOVE AROUND THE HIGH AND INTO SOUTHEAST ARIZONA FROM TIME TO TIME INTO NEXT WEEK...THUS AN ACTIVE MONSOON THUNDERSTORM PATTERN IS EXPECTED TO CONTINUE. DISCUSSION...SCATTERED STORMS FIRING OFF ON CUE. ORGANIZATION EVIDENT IN COMPLEX SOUTH OF DOUGLAS WITH SOME TRAINING FEATURES BEGINNING TO MANIFEST THROUGH AREAS OF SANTA CRUZ COUNTY...ON THE BOUNDARY OF THE DEEPEST MOISTURE THAT EXTENDS WEST INTO THE SURGE OVER THE LOWER DESERTS. SEMI-ACTIVE TO ACTIVE AFTERNOON AND EVENING IN STORE WITH INITIAL ACTION WEST OF COCHISE COUNTY...BUT THEYLL JOIN IN NICELY BY EARLY EVENING. OTHERWISE THE STATUS WILL REMAIN QUO AND VARYING DEGREES OF SCATTERED THUNDERSTORMS WILL CONTINUE UNTIL FURTHER NOTICE. MID TO LATE AUGUST...NOW IT GETS INTERESTING. MEYER .TWC...NONE.
In the hours before
Special weather statement, Aug 19, 1:19 PM MST, 3 hours 21 minutes before
AZZ019-029>035-200500-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU AUG 19 1999...THIS PRODUCT IS NOT UPDATED
*CONDITIONAL* *CONDITIONAL*
COUNTY AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 5 25 0 NE 10
GRAHAM 35 5 30 5 NE 10
GREENLEE 45 5 30 5 NE 12
TUCSON/ERN PIMA 30 5 30 5 NE 12
TOHONO OODHAM 30 5 35 10 NE 15
SOUTHEAST PINAL 30 5 30 5 NE 12
WESTERN PIMA 35 5 40 15 NE 15
SANTA CRUZ 30 10 30 5 NE 12
SYNOPSIS...SURGE THROUGH THE LOWER DESERTS WITH SOME DYNAMICS
SHOULD PROVIDE PLENTY OF ACTIVITY OUT WEST. OTHERWISE YOUR
USUAL LIST OF SUSPECTS WITH SPECIAL ATTENTION TO THE WHITE
MOUNTAINS AND ISOLATED TO SCATTERED ELSEWHERE.
*****************************************************************
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 |
|---|---|---|---|---|
| Aug 19, 1:35 PM MST | Severe Thunderstorm Warning | TWC | Santa Cruz | 40 min |
| Aug 19, 2:14 PM MST | Severe Thunderstorm Warning | TWC | Pima | 31 min |
| Aug 19, 2:28 PM MST | Severe Thunderstorm Warning | TWC | Pima, Santa Cruz | 62 min |
| Aug 19, 3:19 PM MST | Flash Flood Warning | TWC | Pima | 61 min |
| Aug 19, 4:13 PM MST | Severe Thunderstorm Warning | TWC | Pinal | 62 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.