Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 77, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Jul 31, 2001, 8:08 PM CDT for Saint Louis County, Minnesota. It was in force for 52 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 31, 2001, 8:08 PM CDT (01:08 UTC)
- Expired
- Jul 31, 2001, 9:00 PM CDT
- In force
- 52 min
- Issued by
- NWS Duluth, MN
- Area
- Whole counties
County Saint Louis County, MN
The radar
The Duluth radar (KDLH), 86 km from the middle of the area, began a volume at 01:08 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 31, 8:30 PM CDT | Thunderstorm Wind 55 E | Ash Lake, MN | A swath of trees 1 mile long and 1/4 mile wide was blown down on Labonty's Point on Lake Kabetogama. The wind speed is estimated. |
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
International Fa, MN (KINL), launched 00:00Z, 1.1 hours before the alert went out and 126 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
- 1223 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 558 m²/s²
- 0-3 km storm-relative helicity
- 694 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 26.2
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 Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 2:50 PM CDT, 5 hours 18 minutes earlier.
Area forecast discussion, Jul 31, 2:50 PM CDT, 5 hours 18 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DULUTH MN 250 PM CDT TUE JUL 31 2001 EXTREME INSTABILITY IN PLACE TNT WITH LIFTED INDICES -3 TO -7 AND CAPES 2000 TO OVER 3000. STRONG 50 KTS+ LLJ DEVELOPS THIS EVENING AND WITH THETA-E RIDGE BUILDING OVER NORTHERN MN...THE STAGE WILL BE SET FOR THUNDERSTORMS WITH HEAVY RAIN. MODELS IN FAIRLY GOOD AGREEMENT WITH MOVEMENT OF LOW/FRONTAL SYSTEM TNT... THEN AVN PUSHES IT THRU NWRN WI WED MUCH FASTER THAN ETA. CHOSE TO GO WITH THE SLOWER AND MORE CONSERVATIVE ETA...AND KEPT CHC OF PRECIP FOR ERN CWA INTO WED MORNING. PRECIPITALBE WATER OVER 2 INCHES...AND RAINFALL AMOUNTS OVER 3 INCHES NOT OUT OF THE QUESTION WITH SUCH A WATER-LOGGED ATMOSPHERE. WILL GO WITH FLASH FLOOD WATCH FOR NORTHERN MN...GENERALLY NORTH OF A LINE FROM WALKER TO TWO HARBORS. FLASH FLOOD GUIDANCE RANGES FROM 3-4 INCHES. RADAR ESTIMATES AVERAGE 1 TO 2 INCHES FOR MUCH OF THE BORDER REGION WITH SOME 4-5 INCHE AMOUNTS FROM OVERNIGHT AND THIS AFTERNOONS STORMS..SO GROUND IS VERY SATURATED. HIGH PRESSURE BUILDS IN WEDNESDAY...FOR A DRIER AFTERNOON. HIGH KEEPS HOLD THROUGH THURSDAY. .DLH...FLASH FLOOD WATCH NORTHERN MN CLC
In the hours before
Local storm report, Jul 31, 8:08 PM CDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH, MN
808 PM CDT TUE JUL 31 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0755 PM LOMAN MN 60 MPH TSTM WIND GUST
07/31/01 KOOCHICHING
CCThe office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:35 PM CDT | Severe Thunderstorm Warning | DLH | Koochiching | 55 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.