Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 72, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Jul 21, 2001, 6:22 PM CDT for Lake County, Minnesota. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 21, 2001, 6:22 PM CDT (23:22 UTC)
- Expired
- Jul 21, 2001, 7:00 PM CDT
- In force
- 38 min
- Issued by
- NWS Duluth, MN
- Area
- Whole counties
County Lake County, MN
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.4 hours before the alert went out and 342 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
- 1431 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 975 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 21, 2:45 PM CDT, 3 hours 37 minutes earlier.
Area forecast discussion, Jul 21, 2:45 PM CDT, 3 hours 37 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DULUTH MN 245 PM CDT SAT JUL 21 2001 FORECAST CONCERNS ARE SHOWER AND TSTM CHCS ONCE AGAIN...BUT ALSO COLD FRONT PASSAGE SUN NIGHT/MONDAY. MODEL DIFFERENCES ONCE AGAIN WITH PLACEMENT AND TIMING THROUGHOUT THE FORECAST. WILL TRY A BLEND AGAIN TODAY. RUC80 MATCHING WELL WITH THE H5 VORT PUSHING ACROSS N MN ATTM. ONLY A FEW LIGHT SHOWERS BEING GENERATED RIGHT NOW. THE LAGGING SOUTHERN PORTION OF THIS H5 SHORTWAVE WILL HAVE A BETTER CHANCE AT TRIGGERING SOME TSTMS LATER THIS AFTERNOON AND EVENING AS MORE SUN AHEAD OF IT WILL HELP DESTABILIZE THE AIRMASS. WILL PUT IN SOME EVENING TSTMS IN SE HALF OF CWA TO COVER THIS WAVE...BUT WILL UPDATE WORDING NEAR ZONE ISSUANCE TIME. NEXT MCS PROJECTED TO TAKE AIM AT OUR W ZONES LATE TONIGHT AND SUNDAY...BUT MODELS DIVERGE GREATLY HERE. AVN HITS ONLY THE N ZONES ON SUNDAY...WHILE ETA/MESO/NGM FOCUS MAINLY S. DAILY TRENDS HAVE BEEN WEAKENING STORMS AS THEY REACH US BY MORNING...BUT INSTABILITY PARAMS INDICATING MODERATELY UNSTABLE CONDITIONS STILL BY 12Z SUN. HOWEVER...WILL NOT GO TOO STRONG ON TSTM WORDING LATE TONIGHT AND SUNDAY WITH THE SIGNIFICANT MODEL DIFFERENCES. MODELS TO AGREE IN LATER PERIODS ON DRAGGING A PRE-FRONTAL TROF THROUGH OUR CWA ON SUNDAY NIGHT. AVN IS MORE AGGRESSIVE HERE WITH FOCUS AND STRENGTH OF THE TROF. MODELS WERE INITIALLY SHOWING THIS AS THE COLD FRONT PASSAGE...BUT NOW HOLD THE COLD FRONT BACK NORTH OF THE CANADIAN BORDER UNTIL MONDAY NIGHT. WILL GO WITH 40 POPS MOST ZONES WITH TROF PASSAGE SUN NIGHT. MODELS DO ALSO AGREE ON A SHORTWAVE HITTING OUR WI ZONES MONDAY MORNING FROM THE SW. WILL GO WITH POPS THERE BUT KEEP OTHER AREAS DRY. A FEW BORDER HOPPING SHOWERS OR STORMS MAY GENERATE IN THE VICINITY OF THE COLD FRONT... SO MAY THROUGH IN 20 POPS IN OUR FAR NW ZONES MONDAY/MONDAY NIGHT. MODELS ARE BASICALLY GOING FOR A DRY FRONTAL PASSAGE ONCE IT DOES MOVE THROUGH ON TUESDAY MORNING. JUST A FEW SHOWERS HINTED ALONG THE CANADIAN BORDER. WILL LEAVE TUES DRY FOR NOW IN THE EXTENDED. PERSISTENCE TEMPS HAVE WORKED OUT WELL AND WILL FOLLOW THAT TREND AGAIN. ONCE AGAIN...GOING A BIT CLOSER TO WARMER FWC. .DLH...NONE. SHIMON
The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:18 PM CDT | Severe Thunderstorm Warning | DLH | Lake, Saint Louis | 57 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; the sounding from the Mesonet's radiosonde archive.