Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 59, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 10, 2001, 8:18 PM MST for Gila County, Yavapai County, Arizona. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 10, 2001, 8:18 PM MST (03:18 UTC)
- Expired
- Aug 10, 2001, 8:50 PM MST
- In force
- 32 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Gila County, AZ, Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 61 km from the middle of the area, began a volume at 03:16 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 3.3 hours before the alert went out and 116 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
- 330 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 1649 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
634 WUUS55 KFGZ 110319 SVRFLG AZC007-025-110350- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 818 PM MST FRI AUG 10 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME NORTHWESTERN GILA COUNTY IN ARIZONA EXTREME SOUTHEASTERN YAVAPAI COUNTY IN ARIZONA * UNTIL 850 PM MST * AT 816 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME NORTHWESTERN GILA COUNTY...OR ABOUT 14 MILES SOUTHWEST OF STRAWBERRY...MOVING SOUTH-SOUTHWEST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... RURAL NORTHWEST GILA COUNTY 2 MILES NORTH OF HORSESHOE RESERVOIR AT 840 PM MST HAIL TO THE SIZE OF DIMES...INTENSE RAIN AND STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3427 11155 3434 11175 3409 11188 3401 11166 $$ JJ
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 Aug 10, 2:30 PM MST, 5 hours 48 minutes earlier.
Area forecast discussion, Aug 10, 2:30 PM MST, 5 hours 48 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST FRI AUG 10 2001
.SYNOPSIS...A MOIST NORTHERLY FLOW WILL CONTINUE TO PRODUCE SHOWERS
AND THUNDERSTORMS OVER NORTHERN ARIZONA TONIGHT. THE LOW PRESSURE
SYSTEM OVER NEW MEXICO WILL DISSIPATE OVERNIGHT WITH HIGH PRESSURE
BUILDING OVER SOUTHERN CALIFORNIA AND WESTERN ARIZONA. THIS WILL ALLOW A
SOMEWHAT DRIER AND WARMER NORTHWEST FLOW TO DEVELOP ON SATURDAY.
HIGH PRESSURE WILL GRADUALLY SHIFT TO THE FOUR CORNERS AREA BY EARLY
NEXT WEEK WITH ENOUGH MOISTURE FOR A CONTINUING CHANCE OF SHOWERS
AND THUNDERSTORMS.
.DISCUSSION...UPPER TROUGH OVER NEW MEXICO WILL ESSENTIALLY
DISSIPATE OVERNIGHT WITH THE UPPER RIDGE OVER SOUTHERN CALIFORNIA
BEGINNING TO DOMINATE THE FLOW PATTERN. THE RIDGE WILL GRADUALLY
SHIFT TO THE FOUR CORNERS AREA BY SUNDAY. IN ANY CASE...A GENERAL
NORTHERLY FLOW SHOULD REMAIN THROUGH SATURDAY WITH TRAJECTORIES A
LITTLE MORE NORTHWESTERLY. THIS WILL RESULT IN SOME DRYING OVER THE
NORTHERN PORTIONS OF THE COUNTY WARNING AREA (CWA) ON SATURDAY.
HOWEVER...MOISTURE WILL REMAIN AMPLE OVER SOUTHERN PORTIONS OF THE CWA.
BY SUNDAY...AS RIDGE SHIFTS TO THE FOUR CORNERS...THE FLOW WILL TURN
MORE FROM THE SOUTHEAST WITH MODELS PROMISING THAT THE MOISTURE WILL
SHIFT TO THE NORTH. FOR TONIGHT...THINK THERE WILL BE ANOTHER ROUND
OF NOCTURNAL STORMS BUT WILL BE MORE FOCUSED OVER THE EASTERN HALF
OF THE LITTLE COLORADO RIVER VALLEY...THE EASTERN MOGOLLON
RIM...WHITE MOUNTAINS AND NORTHERN GILA COUNTY. THE AIR MASS IS
APPARENTLY VERY UNSTABLE ACROSS THIS AREA AND A FAIRLY SIGNIFICANT
AREA OF LOW INERTIAL STABILITY IN THE UPPER LEVELS WILL REMAIN INTO
THE NIGHT. DEEP MOISTURE REMAINS OVER PORTIONS OF YAVAPAI AND
COCONINO COUNTIES AND ANY STORMS THAT FORM WILL PRODUCE HEAVY RAIN.
FOR SATURDAY...WITH SOME DRYING OVER THE NORTH...WOULD EXPECT A MORE
DIURNAL TREND TO CONVECTION AND SOMEWHAT LESS ACTIVITY (ALTHOUGH IT
REMAINS MOIST AND MID LEVEL LAPSE RATES REMAIN FAVORABLE). OVER
CENTRAL AND SOUTHERN PORTIONS OF THE CWA EXPECT SCATTERED TO
NUMEROUS STORMS WITH DEEP MOISTURE REMAINING OVER THE AREA. FOR
SUNDAY MOISTURE NORTHWARD WITH SOME INCREASE IN ACTIVITY. DAYTIME
TEMPERATURES WILL BE WARMER THE NEXT TWO DAYS AS HIGH PRESSURE
BUILDS.
IN THE EXTENDED...SUBTROPICAL RIDGE AXIS REMAINS ENTRENCHED OVER THE
SOUTHWEST UNITED STATES WITH MOIST AIR FROM MEXICO CONTINUING TO
MOVE INTO ARIZONA. AS A RESULT...WILL CONTINUE THE CHANCE OF SHOWERS
AND THUNDERSTORMS THROUGH THE EXTENDED.
MCCOLLUM
.FGZ...FLASH FLOOD WATCH UNTIL 800 PM MST FOR SOUTHWEST COCONINO
COUNTY AND ALL OF YAVAPAI COUNTY.The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 7:29 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 41 min |
| Aug 10, 9:27 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 33 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.