Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 173, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 2001, 8:57 PM CDT for Morrison County, Minnesota. It was in force for 48 min. 3 reports came from 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, with what was reported inside it.
The facts
- Issued
- Jul 17, 2001, 8:57 PM CDT (01:57 UTC)
- Expired
- Jul 17, 2001, 9:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Morrison County, MN
The radar
The Minneapolis radar (KMPX), 155 km from the middle of the area, began a volume at 01:59 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 17, 9:00 PM CDT | Hail 2.75 | Cushing, MN | |
| Jul 17, 9:10 PM CDT | Hail 0.88 | Ft Ripley, MN | |
| Jul 17, 9:40 PM CDT | Thunderstorm Wind 60 E | Little Falls, MN | Grove of trees felled. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 17, 7:00 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 154 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
- 4439 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KMPX 180157 SVRMSP MNC097-180245- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 857 PM CDT TUE JUL 17 2001 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MORRISON COUNTY IN MINNESOTA * UNTIL 945 PM CDT * AT 857 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS 6 MILES NORTH OF RANDALL...OR ABOUT 15 MILES NORTH OF LITTLE FALLS...MOVING SOUTHEAST AT 20 MPH. * SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE... LITTLE FALLS. RANDALL. PIERZ. LASTRUP. GENOLA. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER... SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4620 9463 4588 9442 4599 9399 4630 9437
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:10 PM CDT | Severe Thunderstorm Warning | MPX | Morrison | 35 min |
| Jul 17, 8:37 PM CDT | Tornado Warning | MPX | Morrison | 23 min |
| Jul 17, 10:05 PM CDT | Severe Thunderstorm Warning | MPX | Douglas, Todd | 40 min |
| Jul 17, 10:25 PM CDT | Severe Thunderstorm Warning | MPX | Benton, Mille Lacs | 50 min |
| Jul 17, 10:31 PM CDT | Severe Thunderstorm Warning | MPX | Kanabec | 44 min |
| Jul 18, 12:55 AM CDT | Severe Thunderstorm Warning | MPX | Wright | 50 min |
| Jul 18, 1:11 AM CDT | Severe Thunderstorm Warning | MPX | Carver | 49 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.