Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 93, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Aug 9, 1999, 2:36 PM CDT for Houston County, Minnesota. It was in force for 54 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
- Aug 9, 1999, 2:36 PM CDT (19:36 UTC)
- Expired
- Aug 9, 1999, 3:30 PM CDT
- In force
- 54 min
- Issued by
- NWS La Crosse, WI
- Area
- Whole counties
County Houston County, MN
The radar
The La Crosse radar (KARX), 30 km from the middle of the area, began a volume at 19:38 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 |
|---|---|---|---|
| Aug 9, 2:50 PM CDT | Hail 0.75 | Houston, MN |
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 12:00Z, 7.6 hours before the alert went out and 213 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1057 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 9, 2:08 PM CDT, 28 minutes earlier.
Area forecast discussion, Aug 9, 2:08 PM CDT, 28 minutes before
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</html>In the hours before
Special weather statement, Aug 9, 11:45 AM CDT, 2 hours 51 minutes before
IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-101200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 1145 AM CDT MON AUG 9 1999 ...A MODERATE RISK FOR SEVERE WEATHER ACROSS MUCH OF THE AREA LATER THIS AFTERNOON AND THIS EVENING... THE STORM PREDICTION CENTER HAS INDICATED THERE IS A MODERATE RISK OF SEVERE WEATHER ALONG AND NORTH OF AN AUSTIN MINNESOTA...TO DECORAH IOWA...TO RICHLAND CENTER WISCONSIN LINE. SOUTH OF THIS LINE THERE IS A SLIGHT RISK FOR SEVERE WEATHER...IN NORTHEAST IOWA AND FAR SOUTHWEST WISCONSIN. LATE THIS MORNING A COLD FRONT WAS LOCATED IN THE EASTERN DAKOTAS... WHILE A WARM FRONT STRETCHED FROM NEAR SIOUX FALLS SD TO NEAR WATERLOO IOWA. THE WARM FRONT IS EXPECTED TO LIFT NORTH THIS AFTERNOON...WITH A MOIST AND UNSTABLE AIRMASS SPREADING ACROSS THE AREA. THE COLD FRONT WILL PUSH ACROSS MINNESOTA THIS AFTERNOON AND EVENING...AND ACROSS WISCONSIN TONIGHT. AS THE COLD FRONT SLICES INTO THE UNSTABLE AIRMASS...MORE THUNDERSTORMS ARE EXPECTED TO DEVELOP IN WESTERN MINNESOTA THIS AFTERNOON...THEN PUSH EAST ACROSS THE AREA DURING THE LATE AFTERNOON AND EVENING HOURS. THE LOWER AND MIDDLE LEVEL WIND PROFILE IN THE ATMOSPHERE WILL BE FAVORABLE FOR ORGANIZED STORMS AND SUPERCELLS. THE SEVERE WEATHER THREATS WILL BE DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES. STORM SPOTTER GROUPS SHOULD REMAIN ALERT...AS ACTIVATION IS A GOOD BET LATE THIS AFTERNOON AND EVENING...ROUGHLY BETWEEN THE HOURS OF 5 PM AND MIDNIGHT. STAY TUNED TO YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR LATER UPDATES ON THIS THREAT FOR SEVERE WEATHER. RRS
Special weather statement, Aug 9, 11:45 AM CDT, 2 hours 51 minutes before
IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-101200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 1145 AM CDT MON AUG 9 1999 ...A MODERATE RISK FOR SEVERE WEATHER ACROSS MUCH OF THE AREA LATER THIS AFTERNOON AND THIS EVENING... THE STORM PREDICTION CENTER HAS INDICATED THERE IS A MODERATE RISK OF SEVERE WEATHER ALONG AND NORTH OF AN AUSTIN MINNESOTA...TO DECORAH IOWA...TO RICHLAND CENTER WISCONSIN LINE. SOUTH OF THIS LINE THERE IS A SLIGHT RISK FOR SEVERE WEATHER...IN NORTHEAST IOWA AND FAR SOUTHWEST WISCONSIN. LATE THIS MORNING A COLD FRONT WAS LOCATED IN THE EASTERN DAKOTAS... WHILE A WARM FRONT STRETCHED FROM NEAR SIOUX FALLS SD TO NEAR WATERLOO IOWA. THE WARM FRONT IS EXPECTED TO LIFT NORTH THIS AFTERNOON...WITH A MOIST AND UNSTABLE AIRMASS SPREADING ACROSS THE AREA. THE COLD FRONT WILL PUSH ACROSS MINNESOTA THIS AFTERNOON AND EVENING...AND ACROSS WISCONSIN TONIGHT. AS THE COLD FRONT SLICES INTO THE UNSTABLE AIRMASS...MORE THUNDERSTORMS ARE EXPECTED TO DEVELOP IN WESTERN MINNESOTA THIS AFTERNOON...THEN PUSH EAST ACROSS THE AREA DURING THE LATE AFTERNOON AND EVENING HOURS. THE LOWER AND MIDDLE LEVEL WIND PROFILE IN THE ATMOSPHERE WILL BE FAVORABLE FOR ORGANIZED STORMS AND SUPERCELLS. THE SEVERE WEATHER THREATS WILL BE DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES. STORM SPOTTER GROUPS SHOULD REMAIN ALERT...AS ACTIVATION IS A GOOD BET LATE THIS AFTERNOON AND EVENING...ROUGHLY BETWEEN THE HOURS OF 5 PM AND MIDNIGHT. STAY TUNED TO YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR LATER UPDATES ON THIS THREAT FOR SEVERE WEATHER. RRS
Special weather statement, Aug 9, 12:15 PM CDT, 2 hours 21 minutes before
IAZ131-067-037-089-091800- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1215 PM CDT MON AUG 9 1999 ...THUNDERSTORMS MOVING ACROSS NORTHEAST IOWA... AT 1210 PM...DOPPLER RADAR IN LA CROSSE WAS INDICATING SCATTERED THUNDERSTORMS MOVING INTO NORTHEAST IOWA FROM SOUTHCENTRAL MINNESOTA AND NORTHCENTRAL IOWA. THESE STORMS CONTINUE TO PRODUCE HEAVY RAIN AND LIGHTNING...AND ISOLATED REPORTS OF DIME-SIZED HAIL. THE MASON CITY AIRPORT RECEIVED ONE-HALF INCH DIAMETER HAIL AND CLEAR LAKE HAD NICKEL-SIZED HAIL. AT 1213 PM...DOPPLER RADAR INDICATED THIS PARTICULAR STORM WAS WEAKENING AS IT MOVED TOWARD FLOYD COUNTY. THE THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH AND WILL MOVE THROUGH THE AREA BY 130 PM. THE NATIONAL WEATHER SERVICE IN LA CROSSE IS MONITORING THE THUNDERSTORMS AND WILL ISSUE FURTHER UPDATES AS NEEDED. TAKE PRECAUTIONS NOW FOR THESE THUNDERSTORMS AND STAY TUNED TO YOUR FAVORITE WEATHER SOURCE FOR UPDATES. DB
Special weather statement, Aug 9, 12:15 PM CDT, 2 hours 21 minutes before
IAZ131-067-037-089-091800- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1215 PM CDT MON AUG 9 1999 ...THUNDERSTORMS MOVING ACROSS NORTHEAST IOWA... AT 1210 PM...DOPPLER RADAR IN LA CROSSE WAS INDICATING SCATTERED THUNDERSTORMS MOVING INTO NORTHEAST IOWA FROM SOUTHCENTRAL MINNESOTA AND NORTHCENTRAL IOWA. THESE STORMS CONTINUE TO PRODUCE HEAVY RAIN AND LIGHTNING...AND ISOLATED REPORTS OF DIME-SIZED HAIL. THE MASON CITY AIRPORT RECEIVED ONE-HALF INCH DIAMETER HAIL AND CLEAR LAKE HAD NICKEL-SIZED HAIL. AT 1213 PM...DOPPLER RADAR INDICATED THIS PARTICULAR STORM WAS WEAKENING AS IT MOVED TOWARD FLOYD COUNTY. THE THUNDERSTORMS ARE MOVING SOUTHEAST AT 40 MPH AND WILL MOVE THROUGH THE AREA BY 130 PM. THE NATIONAL WEATHER SERVICE IN LA CROSSE IS MONITORING THE THUNDERSTORMS AND WILL ISSUE FURTHER UPDATES AS NEEDED. TAKE PRECAUTIONS NOW FOR THESE THUNDERSTORMS AND STAY TUNED TO YOUR FAVORITE WEATHER SOURCE FOR UPDATES. DB
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:23 PM CDT | Severe Thunderstorm Warning | ARX | Olmsted | 57 min |
| Aug 9, 1:39 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore | 61 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1999Every severe thunderstorm warning in 1999
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.