Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 11, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 19, 1998, 4:50 PM MST for Coconino County, Arizona. It was in force for 50 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 19, 1998, 4:50 PM MST (23:50 UTC)
- Expired
- Jul 19, 1998, 5:40 PM MST
- In force
- 50 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 23:53 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 19, 5:05 PM MST | Hail 3 | Flagstaff, AZ | Hail from 1.75 to 3.0 inches in diameter fell during a 45 minute period at the Chevelon Ranger Station. 13 vehicles sustained broken windows and severe denting with a damage total of $14,800. Damage to three metal roofs totalled $32,000. Trees were stripped |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.8 hours before the alert went out and 68 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
- 84 J/kg
- Mixed-layer CIN
- -338 J/kg
- Mixed-layer LCL
- 2314 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 214 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 2:00 PM MST, 2 hours 50 minutes earlier.
Area forecast discussion, Jul 19, 2:00 PM MST, 2 hours 50 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 200 PM MST SUN JUL 19 1998 SYNOPSIS...AN AREA OF HIGH PRESSURE NORTH OF THE STATE WILL CONTINUE A GENERAL EASTERLY FLOW OVER ARIZONA. THIS WILL BRING SOME MOISTURE INTO THE REGION FROM NEW MEXICO AND TEXAS...RESULTING IN ISOLATED AFTERNOON AND EVENING THUNDERSTORMS ACROSS THE NORTHLAND FOR THE NEXT FEW DAYS. DISCUSSION...MID LEVEL DISTURBANCE MOVING THROUGH SE AZ AT THIS TIME. CONVECTION OVER MOGOLLON RIM DEVELOPED A BIT LATER THAN FCSTED...BUT HAS DEVELOPED QUITE RAPIDLY. NEAR THE BORDER...STORMS HAVE BEEN ENHANCED BY S/W WHICH IS IN THE AREA. LOW LEVEL MOISTURE TO REMAIN IN PLACE...AS THEIR WILL BE LITTLE CHANGE IN THE OVERAL PATTERN THE NEXT FEW DAYS. MODELS ALL SEEM TO BE HANDLING LARGER SCALE FAIRLY WELL...BUT ARE SHOWING CONSIDERABLE DIFFERENCES WITH FINER SCALE FEATURES. STANDARD MONSOON SEASON WEATHER WILL BE THE RULE THE NEXT FEW DAYS. MCGRATVH FLG 312 INW 111 FLG...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 1:28 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 47 min |
| Jul 19, 1:57 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 48 min |
| Jul 19, 3:37 PM MST | Severe Thunderstorm Warning | FGZ | Gila, Navajo | 48 min |
| Jul 19, 4:04 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 51 min |
| Jul 19, 4:21 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 49 min |
| Jul 19, 4:37 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 48 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.