Alert archive / Arizona / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 6, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 30, 1990, 5:41 PM MST for Pima County, Arizona. It was in force for 64 min.
The area
The counties it named.
The facts
- Issued
- Aug 30, 1990, 5:41 PM MST (00:41 UTC)
- Expired
- Aug 30, 1990, 6:45 PM MST
- In force
- 64 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pima County, AZ
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.7 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
- 724 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 2628 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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.
In the hours before
Special weather statement, Aug 30, 4:33 PM MST, 1 hour 8 minutes before
AZZ007>009>010-300430- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TUCSON AZ 430 PM MST THU AUG 30 1990 AT 415 PM MST TUCSON WEATHER RADAR AND VISUAL OBSERVATIONS INDICATED THUNDERSTORMS TO THE NORTH AND EAST OF THE TUCSON METROPOLITAN AREA... THESE STORMS ARE SLOWLY MOVING TO THE WEST AND SHOULD EFFECT THE TUCSON AREA WITHIN THE NEXT HOUR...A PIMA COUNTY FLOOD CONTROL DISTRICT RAIN GAUGE HAS REPORTED .55 INCHES OF RAINFALL SINCE 4:00 PM IN THE TANQUE VERDE FALLS AREA... ADDITIONALLY...THUNDERSTORMS ARE OCCURRING IN COCHISE AND SANTA CRUZ COUNTIES...A RAIN GAUGE SOUTH OF GREEN VALLEY REPORTED .55 INCHES OF RAIN IN 20 MINUTES... THESE THUNDERSTORMS ARE LIKELY TO PERSIST FOR THE REMAINDER OF THIS AFTERNOON AND INTO THE EVENING HOURS. VERY STRONG...POSSIBLY DAMAGING WINDS...HEAVY RAIN...AND LOCALIZED FLOODING MAY ACCOMPANY THESE STORMS. > PERSONS IN THE AFFECTED AREAS SHOULD EXERCISE EXTREME CAUTION. REMEMBER...THUNDERSTORfMS CAN CAUSE DAMAGING WINDS...HAIL...AND DANGEROUS LIGHTNING... GANSHEIMER NWS TUS
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 5:41 PM MST | Flash Flood Warning | TWC | Pima | 64 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1990Every severe thunderstorm warning in 1990
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.