Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 55, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 9, 2001, 5:11 PM MST for Coconino County, Gila County, Yavapai County, Arizona. It was in force for 34 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 9, 2001, 5:11 PM MST (00:11 UTC)
- Expired
- Aug 9, 2001, 5:45 PM MST
- In force
- 34 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Coconino County, AZ, Gila County, AZ, Yavapai County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 0.2 hours before the alert went out and 91 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
- 965 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1265 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
404 WUUS55 KFGZ 100012 SVRFLG AZC005-007-025-100045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 511 PM MST THU AUG 9 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTH CENTRAL COCONINO COUNTY IN ARIZONA EXTREME NORTHWESTERN GILA COUNTY IN ARIZONA THIS INCLUDES THE CITIES OF...STRAWBERRY...PINE EXTREME EAST CENTRAL YAVAPAI COUNTY IN ARIZONA * UNTIL 545 PM MST * AT 511 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES WEST OF STRAWBERRY...MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... OVER STRAWBERRY AT 535 PM MST OVER PINE AT 540 PM MST VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS WASHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE... THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3451 11170 3438 11175 3427 11149 3446 11142
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 9, 3:34 PM MST, 1 hour 37 minutes earlier.
Area forecast discussion, Aug 9, 3:34 PM MST, 1 hour 37 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST THU AUG 09 2001 .SYNOPSIS...LOW PRESSURE OVER NEW MEXICO WILL CONTINUE TO BRING SHOWERS AND THUNDERSTORMS TO MUCH OF NORTHERN ARIZONA TONIGHT. THE LOW PRESSURE SYSTEM WILL BEGIN TO WEAKEN ON FRIDAY WITH HIGH PRESSURE STRENGTHENING OVER SOUTHERN CALIFORNIA. THIS WILL ALLOW A DRIER AND WARMER NORTHWEST FLOW TO DEVELOP ON FRIDAY AND 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...A MID TO UPPER TROUGH REMAINS OVER NEW MEXICO WITH AN AN UPPER RIDGE CENTERED OVER NORTHERN BAJA CALIFORNIA. AS A RESULT...A MOIST AND UNSTABLE NORTHEAST FLOW WILL CONTINUE FOR THE NEXT 12- TO 24-HOURS. THERE WERE A FEW STRONG AND ORGANIZED THUNDERSTORMS THIS AFTERNOON BUT MUCH OF THE AIR MASS ACROSS ARIZONA REMAINED UNSTABLE AND UNTAPPED. FOR TONIGHT...WITH A LARGE AREA OF THUNDERSTORMS DEVELOPING IN SOUTHERN UTAH AND FAR NORTHWEST ARIZONA THIS AFTERNOON...EXPECT THIS AREA OF STORMS AND ASSOCIATED OUTFLOW TO MOVE SOUTH AND SOUTHEASTWARD INTO COUNTY WARNING AREA TONIGHT FOR PRETTY GOOD COVERAGE OF SHOWERS AND STORMS. ISOLATED SHOWERS AND STORMS OVER THE NORTHEAST CORNER OF THE STATE. ON FRIDAY AND SATURDAY...MODELS ARE INSISTING THAT THE UPPER RIDGE WILL SHIFT NORTHWARD WITH A DRIER NORTH TO NORTHWEST FLOW DEVELOPING. THINK THE NET RESULT WILL BE A DOWNTURN IN ACTIVITY INTO SATURDAY WITH A MORE DIURNAL NATURE TO THUNDERSTORMS. PROBABLY STILL GO WITH A GENERAL LOW END SCATTERED WORDING FOR FRIDAY AND SATURDAY OVER THE HIGHER TERRAIN AND SOUTH AND SOUTHWEST OF THE RIM WITH ISOLATED STORMS ELSEWHERE AS LOW-LEVEL MOISTURE WILL BE SLOW TO SCOUR OUT. IN THE EXTENDED...EXTENDED MODELS ARE CONSISTENT IN KEEPING THE SUBTROPICAL RIDGE AXIS LOCATED OVER THE SOUTHWEST UNITED STATES THROUGH WELL INTO NEXT WEEK. IN ADDITION...NORTHWEST MEXICO WILL BE IN A FAVORED LOCATION FOR THE DEVELOPMENT OF MESOSCALE CONVECTIVE COMPLEXES WHICH SHOULD FAVOR A CONTINUED NORTHWARD PUSH OF MOISTURE INTO ARIZONA. DAY TO DAY VARIATIONS IN THE LOCATION OF THE MID-LEVEL CENTER OF ANTICYCLONIC CIRCULATION WILL MODULATE STORM ACTIVITY. WILL LET THE STANDARD MONSOON FORECAST STAND THROUGH THE EXTENDED. MCCOLLUM .FGZ...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 10:26 PM MST | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Aug 10, 11:12 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 33 min |
| Aug 10, 1:34 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 36 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.