Alert archive / Iowa / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 43, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Jun 6, 1999, 7:55 PM CDT for Howard County, Iowa. It was in force for 60 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
- Jun 6, 1999, 7:55 PM CDT (00:55 UTC)
- Expired
- Jun 6, 1999, 8:55 PM CDT
- In force
- 60 min
- Issued by
- NWS La Crosse, WI
- Area
- Whole counties
County Howard County, IA
The radar
The La Crosse radar (KARX), 104 km from the middle of the area, began a volume at 00:57 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 |
|---|---|---|---|
| Jun 6, 8:35 PM CDT | Thunderstorm Wind 58 | Chester, IA |
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 |
|---|---|---|---|
| Jun 6, 6:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.9 hours before the alert went out and 195 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
- 8 J/kg
- Mixed-layer CIN
- -229 J/kg
- Mixed-layer LCL
- 2739 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 195 m²/s²
- 0-3 km storm-relative helicity
- 234 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 Jun 6, 2:56 PM CDT, 4 hours 59 minutes earlier.
Area forecast discussion, Jun 6, 2:56 PM CDT, 4 hours 59 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LA CROSSE WI 252 PM CDT SUN JUNE 6 1999 MAIN FOCUS AGAIN THIS AFTERNOON AND EVENING IS SEVERE WEATHER POTENTIAL. SVR AND TOR WATCHES IN EFFECT FOR ENTIRE CWA EXCEPT FOR TAYLOR COUNTY THROUGH THIS EVENING. GIVEN INCREASING LINEAR SPEED SHEAR DUE TO H3 JET NOSING INTO CENTRAL IOWA...EXPECT AN ACTIVE EVENING ON THE RADAR. THE GOOD NEWS IS THAT ALL MODELS ADVERTISE RIDGING AND GOOD DRYING AFTER MIDNIGHT AS THE VIGOROUS SHORTWAVE AND UPPER TROF MOVE NORTHEASTWARD OVERNIGHT AND MONDAY. MAIN CONCERNS BEYOND TONIGHT FOCUS ON MAX TEMPERATURES NEXT TWO DAYS. EVEN WITH HEIGHTS SOMEWHAT DEPRESSED ON MONDAY...850 TEMPS REMAIN WARM AND GIVEN THE DRYING OCCURRING IN THE LOW LEVELS AND GOOD MIXING...EXPECT LITTLE COOLING FROM TODAY'S READINGS. RIDGE AMPLIFIES ON TUESDAY FOR WARMER CONDITIONS...PROBABLY WELL INTO THE LOWER TO MIDDLE 90S OVER SOUTHWEST WISCONSIN. .LSE...NONE. DEVOIR
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 7:36 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 64 min |
| Jun 6, 9:05 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo | 50 min |
| Jun 6, 9:24 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Trempealeau | 61 min |
| Jun 6, 8:14 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore, Mower | 61 min |
| Jun 6, 8:50 PM CDT | Severe Thunderstorm Warning | ARX | Houston, Winona | 65 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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.