Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 170, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 20, 2002, 11:07 PM CDT for Mille Lacs County, Minnesota. It was in force for 38 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 20, 2002, 11:07 PM CDT (04:07 UTC)
- Expired
- Jul 20, 2002, 11:45 PM CDT
- In force
- 38 min
- Issued by
- NWS Twin Cities, MN
- Area
- Counties, with a storm outline in the text
County Mille Lacs County, MN
The radar
The Duluth radar (KDLH), 133 km from the middle of the area, began a volume at 04:06 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 20, 11:35 PM CDT | Thunderstorm Wind 55 E | Isle, MN | Trees down, including one on a trailer. |
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
Minneapolis, MN (KMPX), launched 00:00Z, 4.1 hours before the alert went out and 155 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
- 4791 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 842 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 269 m²/s²
- 0-3 km storm-relative helicity
- 412 m²/s²
- Significant tornado parameter
- 7.4
- Supercell composite
- 49.7
The text
As transmitted, in the capitals the NWS used until 2016.
946
WUUS53 KMPX 210407
SVRMSP
MNC095-210445-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1106 PM CDT SAT JUL 20 2002
THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA
* UNTIL 1145 PM CDT
* AT 1106 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
HAIL 15 MILES WEST OF WAHKON...OR ABOUT 21 MILES SOUTHEAST OF
BRAINERD...MOVING EAST AT 25 MPH.
* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
WAHKON
VINELAND
ONAMIA.
THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.
LAT...LON 4623 9396 4624 9370 4609 9368 4608 9347
4658 9352The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:04 AM CDT | Severe Thunderstorm Warning | MPX | Douglas, Pope, Todd | 41 min |
| Jul 21, 7:32 AM CDT | Severe Thunderstorm Warning | MPX | Morrison | 58 min |
| Jul 21, 7:45 AM CDT | Severe Thunderstorm Warning | MPX | Todd | 30 min |
| Jul 21, 2:53 PM CDT | Flash Flood Warning | MPX | Anoka, Hennepin, Wright | 3 hr |
| Jul 21, 5:00 PM CDT | Severe Thunderstorm Warning | MPX | Freeborn | 45 min |
| Jul 21, 5:32 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 43 min |
| Jul 21, 5:48 PM CDT | Flash Flood Warning | MPX | Freeborn | 3 hr |
| Jul 21, 6:00 PM CDT | Flash Flood Warning | MPX | Faribault, Martin | 3 hr |
| Jul 21, 6:20 PM CDT | Severe Thunderstorm Warning | MPX | Faribault, Martin | 40 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002
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.