Alert archive / Florida / Mesoscale Discussions in 2003
Mesoscale Discussion 249
The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2003, 2:36 PM EST for 4 counties in Florida. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Mar 14, 2003, 2:36 PM EST (19:36 UTC)
- Expired
- Mar 14, 2003, 4:30 PM EST
- In force
- 114 min
- Issued by
- the Storm Prediction Center
Counties Glades County, FL, Hendry County, FL, Highlands County, FL, Okeechobee County, FL
The radar
The Melbourne radar (KMLB), 146 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.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 7.6 hours before the alert went out and 137 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
- 1311 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
039 ACUS11 KWNS 141937 SWOMCD SPC MCD 141936 FLZ000-142130- MESOSCALE DISCUSSION 0249 NWS STORM PREDICTION CENTER NORMAN OK 0136 PM CST FRI MAR 14 2003 AREAS AFFECTED...INTERIOR S FL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 141936Z - 142130Z ISOLATED SEVERE STORMS ARE EXPECTED TO DEVELOP NEAR AND S OF LAKE OKEECHOBEE IN THE NEXT 1-2 HOURS. LARGE HAIL AND DAMAGING GUSTS WILL BE POSSIBLE WITH THE STRONGEST STORMS...THOUGH LIMITED SEVERE STORM COVERAGE SUGGESTS A WW WILL NOT BE NECESSARY. VISIBLE IMAGERY SHOWS SEVERAL CLUSTERS OF TOWERING CUMULUS DEVELOPING FROM IMMEDIATELY NW OF MIAMI TO NEAR LAKE OKEECHOBEE. SURFACE TEMPERATURES HAVE WARMED TO THE MID-UPPER 80S AND DEW POINTS REMAIN IN THE UPPER 60S...SUPPORTING MLCAPE VALUES NEAR 2000 J/KG. IN ADDITION...DEEP TROPOSPHERIC SHEAR APPEARS MARGINALLY FAVORABLE FOR ORGANIZED/PERSISTENT STORMS. EXPECT THUNDERSTORMS TO DEVELOP IN THE DISCUSSION AREA DURING THE NEXT 1-2 HOURS AS CONVECTIVE INHIBITION IS REDUCED AND SEA/LAKE BREEZE BOUNDARIES INTERACT ACROSS GLADES/HENDRY/PALM BEACH/BROWARD COUNTIES. THE STRONGEST STORMS MAY PRODUCE MARGINALLY SEVERE HAIL AND STRONG DOWNBURST WINDS... ESPECIALLY IN THE CASE WHERE ANY STORMS ARE ABLE TO MOVE SLOWLY SWD ALONG THE N-S ORIENTED SEA BREEZE FRONT. ..THOMPSON.. 03/14/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MFL...MLB...TBW... 26218130 26848146 27338149 27648142 27768122 27488086 26768043 26338051 25928053
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 8:48 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 5 more | 57 min |
| Mar 14, 12:58 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more | 2 hr |
| Mar 14, 5:05 PM EST | Severe Thunderstorm Watch | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton | 5 hr |
| Mar 14, 5:54 PM EST | Mesoscale Discussion | SPC | Broward, Glades, Hendry, Highlands, Okeechobee, Palm Beach | 66 min |
Nearby
Mesoscale Discussions in Florida, 2003Every mesoscale discussion in 2003
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; radar from the NEXRAD Level II archive.